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Mitsubishi Electric QAHV-N560YA-HPB Service Handbook
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Mitsubishi Electric QAHV-N560YA-HPB Service Handbook

Mitsubishi Electric QAHV-N560YA-HPB Service Handbook

Hot water heat pump
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Summary of Contents for Mitsubishi Electric QAHV-N560YA-HPB

  • Page 2 CAUTION Indicates a risk of damage to the unit or other components in the system IMPORTANT All electric work must be performed by personnel certified by Mitsubishi Electric. General WARNING To reduce the risk of burns or frost bites, do not touch the...
  • Page 3 To reduce the risk of injury, do not sit, stand, or place objects To prevent environmental pollution, dispose of brine in on the unit. the unit and cleaning solutions according to the local regulations. Do not connect the makeup water pipe directly to the It is punishable by law not to dispose of them according to the potable water pipe.
  • Page 4 Any additional parts must be installed by qualified personnel. The unit should be installed only by personnel certified Only use the parts specified by Mitsubishi Electric. by Mitsubishi Electric according to the instructions detailed in the Installation/Operation Manual. Take appropriate safety measures against wind gusts and...
  • Page 5 To reduce the risk of current leakage, overheating, smoke, or Proper grounding must be provided by a licensed fire, use properly rated cables with adequate current carrying electrician. Do not connect the grounding wire to a gas capacity. pipe, water pipe, lightning rod, or telephone wire. Improper grounding may result in electric shock, smoke, fire, Keep the unsheathed part of cables inside the terminal or malfunction due to electrical noise interference.

  • Page 6: Table Of Contents

    CONTENTS I Read Before Servicing [1] Read Before Servicing......................3 [2] Necessary Tools and Materials ....................4 [3] Brazing............................5 [4] Procedure ..........................6 [5] CO2 refrigerant manifold structure ..................11 [6] Characteristics of the Conventional and the New Refrigerants ..........12 [7] Notes on Refrigerating Machine Oil..................
  • Page 7 CONTENTS HWE1517A...
  • Page 8 I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Brazing..........................5 [4] Procedure .......................... 6 [5] CO2 refrigerant manifold structure................... 11 [6] Characteristics of the Conventional and the New Refrigerants ........12 [7] Notes on Refrigerating Machine Oil .................
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  • Page 10: Read Before Servicing

    1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Hot water Heat pump QAHV-N560YA-HPB:R744 2. Check the symptoms exhibited by the unit to be serviced. Refer to this service handbook for symptoms relating to the refrigerant cycle.

  • Page 11: Necessary Tools And Materials

    [ I Read Before Servicing ] [2] Necessary Tools and Materials Prepare the following tools and materials necessary for servicing the unit. Replacement procedures for refrigerant circuit components Preparation 1. Tools required (1) Special tools for use with CO refrigerant 1) Manifold: Withstand pressure of 21 MPa (Maximum unit pressure: 14 MPa) 2) Refrigerant charging hose (Withstand pressure: maximum unit pressure of 14 MPa);...

  • Page 12: Brazing

    [ I Read Before Servicing ] [3] Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of oxidized solder for brazing Use of non-oxidized solder for brazing 1.

  • Page 13: Procedure

    [ I Read Before Servicing ] [4] Procedure (1) Refrigerant purging Procedure Cautionary notes Make sure the high- and low-pressure service valves If the valves are open, there is a risk of refrigerant are closed all the way. gushing out when the sealing caps are removed. Use caution because a small amount of refrigerant Remove the sealing caps from the high- and low-pressure service joints.
  • Page 14 [ I Read Before Servicing ] (2) Parts replacement Procedure Cautionary notes Using a pipe cutter, cut a slit in the pipe on the side of Residual pressure in the pipe can pose safety the unit where parts are replaced to ensure an absence hazards.
  • Page 15 [ I Read Before Servicing ] (3) Gas leak test Procedure Cautionary notes Connect the manifold to the high-pressure service manifold has a structure different than that of valve. Fully close the low-pressure service valve. HFC manifold. Refer to the “[5] CO refrigerant manifold structure”...
  • Page 16 [ I Read Before Servicing ] (4) Vacuuming the refrigerant circuit Procedure Cautionary notes Fully close the low-pressure service valve on the unit. – This is done to evacuate the hose between the unit Connect the CO cylinder to the gas charging/release hose that connects to the manifold.
  • Page 17 [ I Read Before Servicing ] (5) Refrgerant charging 1: Charging the unit with refrigerant while the unit is stopped Procedure Cautionary notes First, check the degree of vacuum. If measurement of vacuum degree with a vacuum When the vacuum completion time is reached, close gauge is possible, make sure the gauge reading is the packless valve.

  • Page 18: Co2 Refrigerant Manifold Structure

    [ I Read Before Servicing ] [5] CO refrigerant manifold structure 1. Structural comparison between CO manifold and HFC/HCFC manifold (1) CO manifold <Circuit structure> A: Vacuum gauge B: Pressure gauge B: Pressure gauge 2: Pressure gauge valve Connection Connection to to refrigerant air-conditioning unit cylinder...

  • Page 19: Characteristics Of The Conventional And The New Refrigerants

    [ I Read Before Servicing ] [6] Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R744) is low in toxicity and chemically stable nonflammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.

  • Page 20: Notes On Refrigerating Machine Oil

    [ I Read Before Servicing ] [7] Notes on Refrigerating Machine Oil 1. Refrigerating machine oil in the HFC refrigerant system R744 refrigerants use a refrigerating machine oil different from that used in the R22 or HFC system. Refrigerant Refrigerating machine oil R744 PAG (Polyalkylene glycol) Mineral oil...
  • Page 21 [ I Read Before Servicing ] - 14 - HWE1517A...

  • Page 22: Restrictions

    II Restrictions [1] System Configuration....................... 17 [2] Types and Maximum allowable Length of Cables ............18 [3] Main Power Supply Wiring and Switch Capacity ............. 19 [4] Sample Installation......................23 [5] Switch Types and the Factory Settings................24 [6] Configuring the Settings....................25 [7] Water Pipe Installation .....................
  • Page 23 - 16 - HWE1517A...

  • Page 24: System Configuration

    [ II Restrictions ] II Restrictions [1] System Configuration Schematic Diagrams of In dividual and Multiple Systems (1) Individual system * Each unit is operated individually by connecting a dry contact switch/relay to each unit. Unit (MAIN circuit) Unit (MAIN circuit) External External temperature...

  • Page 25: Types And Maximum Allowable Length Of Cables

    [ II Restrictions ] [2] Types and Maximum allowable Length of Cables Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual. 2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference. (Do not put the control cable and power supply cable in the same conduit tube.) 3) Provide grounding for the outdoor unit as required.

  • Page 26: Main Power Supply Wiring And Switch Capacity

    Current leakage breaker No-fuse breaker (A) System Impedance y t i QAHV-N560YA-HPB 63 A 100 mA 0.1 sec. or less 0.21 Ω 1. Use a dedicated power supply for each unit. Ensure that each unit is wired individually. 2. When installing wiring, consider ambient conditions (e.g., temperature, sunlight, rain).
  • Page 27 [ II Restrictions ] Control cable specifications ( ² l a t Remote controller cable ( ² M-NET cable between units External input wire size Min. 0.3 mm² External output wire size 1.25 mm² *1 Use a CVVS or CPEVS cable (Max. total length of 200 m) if there is a source of electrical interference near by (e.g., factory) or the total length of control wiring exceeds 120 m.
  • Page 28 [ II Restrictions ] Note: • Make sure the cables are not coming out of the rubber bushing cut. Top view Wiring Cables are coming out of the rubber bushing. Wiring Rubber bushing (oval part) Rubber bushing Wiring (oval part) Rubber bushing Top view Cross-sectional view...
  • Page 29 [ II Restrictions ] <3> Wiring for Configuring Se c ondary Side Control System To configure a secondary side control system, you need to connect the wiring of the following three devices from the secondary side water circuit to the primary side unit. 1 Flow sensor 2 Secondary side thermistor 3 Pump + flow rate adjustment device...

  • Page 30: Sample Installation

    [ II Restrictions ] [4] Sample Installation (1) Individual system * Each unit is operated individually by connecting a dry contact switch/relay to each unit. Unit (MAIN circuit) Unit (MAIN circuit) External External temperature temperature sensor sensor Field-supplied dry contact Field-supplied dry contact switch/relay or remote switch/relay or remote...

  • Page 31: Switch Types And The Factory Settings

    [ II Restrictions ] [5] Switch Types and the Factory Settings (1) Switch names and functions Discharge air outlet Control box Service panel Intake air inlet Water outlet Water inlet There are four main ways to set the settings as follows: 1Dip switches (SW1 - SW3) 2Dip switches used in combination with the push switches 3Rotary switches...

  • Page 32: Configuring The Settings

    [ II Restrictions ] [6] Configuring the Settings The settings must be set only by a qualified personnel. Making the settings Use the LED display and the three push switches (SWP1 (↑), SWP2 (↓), and SWP3 (Enter)) to change the current settings on the circuit board and to monitor various monitored values.
  • Page 33 [ II Restrictions ] (2) Table of settings items Set the dip switches SW2 and SW3 as shown in the table below to set the value for the items in the "Setting item" column. Dip switch Item Lower Initial Setting Setting item Unit Upper limit...
  • Page 34 [ II Restrictions ] (3) System configuration procedures: Individual system 1. Set the dip switches on the MAIN circuit board. Set the dip switches (labeled A in the figure at right) that correspond to the local system. Refer to “Factory Switch Settings (Dip switch settings table)” (page 85) for further details.
  • Page 35 [ II Restrictions ] 3. Set the preset values with the switches on the circuit board. (1) Set the dip switches SW2 and SW3 by following the procedure in page 101. (Set the dip switches 3-8, 3-9, and 3-10 to ON.) * [EEEE] will disappear, and an item code ([101]) will appear on LED1 (labeled B in the figure at right).
  • Page 36 [ II Restrictions ] (4) System configuration procedures : Multiple system 1. Set the dip switches and rotary switches. (Switches on the main unit* AND on all sub units) System configuration diagram Unit (MAIN circuit) Unit (MAIN circuit) Unit (MAIN circuit) External water temperature...
  • Page 37 [ II Restrictions ] 2. Switch on the power to the unit. Check for loose or incorrect wiring, and then switch on the power to all units. When the power is switched on, the following codes will appear on the LED: •...
  • Page 38 [ II Restrictions ] 4. Perform an initial setup on the unit (1) Set the sub unit rotary switch SWU3 on the unit (labeled A in the figure Main unit at right) to "F." [EEEE] will appear in LED1 (labeled B in the figure at right). *1 (2) Press and hold the sub unit push switch (SWP3) (labeled C in the figure at right) for one second or longer.
  • Page 39 [ II Restrictions ] (5) Re-initializing the system When the settings for the items below have been changed, the system will require re-initialization. • Dip switch SW2-9 (multiple unit control) • External signal input setting: Item codes [105], [106], [107], [110], [111], [112], [121], and [1214] •...

  • Page 40: Water Pipe Installation

    [ II Restrictions ] [7] Water Pipe Installation 1. Schematic Piping Diagram and Piping System Components indicates the direction of the water flow. Heat pump unit To storage tank From storage tank Water piping diagram Union joints/flange joints Required to allow for a replacement of equipment. Thermometer Required to check the performance and monitor the operation of the units.
  • Page 41 [ II Restrictions ] * 3-way valve installation Please connect 3-way valve on the lower part of the storage tank except when the unit is in operation. Anti- freezing operation will keep the water in the tank circulated and water storage tanks can become thermally stratified.
  • Page 42 [ II Restrictions ] 2. Notes on pipe corrosion Water treatment and water quality control Poor-quality circulating water can cause the water-side heat exchanger to scale up or corrode, reducing heat- exchange performance. Properly control the quality of the circulating water. •...
  • Page 43 [ II Restrictions ] 3. Water pipe hole size and location Hot water outlet (Bronze Rc3/4, female screw) Service panel Water inlet (Bronze Rc3/4, female screw) Front view Side view 4. Pipe gradient and air venting valve (Outlet hot water pipe) During the hot water storage operation, the air dissolved in the water is discharged in the form of bubbling from the outlet hot water pipe to quickly raise low-temperature water to the required temperature.

  • Page 44: Using The Unit In Sub-Freezing Or Snowy Conditions

    [ II Restrictions ] [8] Using the Unit in Sub-freezing or Snowy Conditions In areas where temperature drops to freezing In areas where temperature can drop low enough during the periods of non-use, blow the water out to cause the water in the pipes to freeze, operate of the pipes or fill the pipes with anti-freeze the unit often enough to prevent the water from solution.

  • Page 45: Secondary Side Control System

    [ II Restrictions ] [9] Secondary side control system When employing an indirect heat exchanger system using a separately sold Q-1SCK, be careful with regard to the following points. Install the Q-1SCK (flow sensor and temperature sensor) in the secondary side circuit as shown below to perform control.
  • Page 46 [ II Restrictions ] Component Application Remarks and notes on selecting and installing components Improves the workability of cleaning the heat Install these components in the two places of the chilled water passage section Valve exchanger and and the high temperature water passage section to enable replacement. replacing parts.
  • Page 47 [ II Restrictions ] Step 3 Determination of specifications of the heat exchanger Determine the model of heat exchanger and number of plates in consultation with the heat exchanger manufacturer based on the above requirements. * To determine the number of plates, calculate the number of plates while referring to the example below. Values to use when determining the number of plates: 1 Overall heat transfer coefficient of corresponding heat exchanger 2 Heat transfer area per plate...
  • Page 48 [ II Restrictions ] 3 Configuration method and selection criteria of flow rate adjustment device In this system, a flow rate adjustment device is installed in the secondary side circuit to perform secondary side flow rate adjustment control by outputting 0 to 10 V from the unit. * 10-V power supply is not supplied.
  • Page 49 [ II Restrictions ] 2. System using a two-way valve Overview of system ON/OFF signal This system has a pump provided at the outlet of the tank and a two-way valve provided downstream of 0 to 10 V output the pump, and adjusts the flow rate by controlling the opening and closing of the two-way valve.
  • Page 50 Also, take measures so that the piping will not freeze. Installation indoors Installation outdoors Secondary side thermistor QAHV-N560YA-HPB Storage tank Secondary side heat exchanger Secondary side pump...
  • Page 51 [ II Restrictions ] 4 When connecting multiple units To connect multiple units, configure one secondary side circuit system for each unit as shown in the figure below. (Install a heat exchanger, flow sensor, and thermistor for each unit.) Storage tank Storage tank QAHV- QAHV-...

  • Page 52: Unit Components

    III Unit Components [1] Unit Components and Refrigerant Circuit ................ 47 [2] Control Box of the Unit..................... 50 [3] Unit Circuit Board......................52 - 45 - HWE1517A...
  • Page 53 - 46 - HWE1517A...

  • Page 54: Unit Components And Refrigerant Circuit

    [ III Unit Components ] III Unit Components [1] Unit Components and Refrigerant Circuit 1. Unit Components (1) Front view Bell mouth Fanguard Fanguard fixed plate Frame Frame Frame Pillar LF assy L assy TF assy R Panel Pillar RF assy FU Frame Frame...
  • Page 55 [ III Unit Components ] 2. Refrigerant circuit Pressure switch Pressure sensor Solenoid valve Solenoid valve Linear expansion valve Solenoid coil Solenoid coil Solenoid coil Solenoid valve Solenoid coil Thermistor (TH2) Solenoid valve Solenoid coil Thermistor Expansion valve (TH4) Solenoid coil Thermistor (TH9) Quick adapter...
  • Page 56 [ III Unit Components ] 3. Water circuit Pipe assy 2 Thermistor (TH11) Two way Pipe assy 3 valve Pipe assy 5 O-ring Fastner Pipe assy 8 Grease Fastner Sensor Pipe assy 1 Thermistor (TH12) Heater assy Pipe assy 7 Pipe assy 6 Pump Lead wire assy...

  • Page 57: Control Box Of The Unit

    [ III Unit Components ] [2] Control Box of the Unit 1. Main circuit control box Capacitor assy Fan inverter board assy Reactor Resistor Inverter board assy Relay Short terminal relay Control board assy Fuse Noise filter Fuse Terminal block Terminal block 80 81 Sheet...
  • Page 58 [ III Unit Components ] 2. Sub circuit control box Fuse Power board assy Relay board assy Terminal block (TB8) Terminal block (TB4) Terminal block Terminal block (TB5) Terminal block (TB6) 1) Exercise caution not to damage the bottom and the front panel of the control box. Damage to these parts affect the waterproof and dust proof properties of the control box and may result in damage to its internal components.

  • Page 59: Unit Circuit Board

    [ III Unit Components ] [3] Unit Circuit Board 1. Control board (MAIN board) CN332 CN801 CN 2 Output 18VDC Pressure switch CN 4 CNDC Serial communication connection GND(Fan board) signal input Bus voltage input Serial communication signal output Output 17VDC driving output CN3A Remote controller...
  • Page 60 [ III Unit Components ] 2. M-NET board CNS2 CNIT Transmission line input/output for 12VDC input CN04 centralized control system CN102 Bus voltage input 5VDC input Power supply output for centralized control system Power supply detection output Indoor/outdoor transmission line input/output Power supply ON/OFF Grounding signal input...
  • Page 61 [ III Unit Components ] 3. INV board SC-P1 Open: No-load operation setting Rectifier diode output (P) Short-circuited: Normal setting RSH1 CN5V LED1 SC-P2 Overcurrent detection Lit: Inverter in normal operation Bus voltage Input(P) Blink: Inverter error resistor 5VDC output GND(Fan Board) Serial communication signal output...
  • Page 62 [ III Unit Components ] 4. Fan board LED3 CN18V Lit during normal Input 18VDC Serial communication signal output CPU operation GND(Control board) Serial communication signal output CN21 Serial communication signal output GND(INV board) CNVDC Input 17VDC Bus voltage input CN22 GND(INV board) Input 5VDC...
  • Page 63 [ III Unit Components ] 5. Noise Filter Output Output (Rectified L2-N current) (Rectified L2-N current) Surge absorber circuit Surge absorber circuit Short circuit Short circuit Grounding F1,F2,F3,F4 Fuse 250VAC 6.3A Output Grounding CN1A Input CN1B TB21 TB22 TB23 TB24 Input Input/output(L1) Input/output(L2)

  • Page 64: Remote Controller

    IV Remote Controller [1] Using the Remote Controller.................... 59 - 57 - HWE1517A...
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  • Page 66: Using The Remote Controller

    [ IV Remote Controller ] IV Remote Controller [1] Using the Remote Controller <1> Power ON/OFF Unit1 Press the [ON/OFF] button. During operation Next The ON/OFF lamp will light up in green, and the operation will start. Unit1 Pressing the [ON/OFF] button brings up a confirmation screen. When it appears, press the [F3] button.
  • Page 67 [ IV Remote Controller ] <3> Using Weekly timer Function description Following settings can be used to change the operating schedule according to the day of the week. Set the schedule for ON/OFF, operation mode and set temperature for each day of the week. Button operation Select "Weekly timer"...
  • Page 68 [ IV Remote Controller ] In the Operation setting screen, press the [F1] button to move the cursor to Unit1 "Schedule". Power Save Press the [F3] button to select "Yes". Schedule Fan Mode Normal Anti-freeze Next <4> Using Period timer Function description Following settings can be made to change the specified period and daily operating schedule.
  • Page 69 [ IV Remote Controller ] The pattern setting screen will be displayed. Unit1 * Refer to the section on Weekly timer for details on using the pattern setting screen. Mode1 Mode2 Weekly timer operation will be disabled in the following situations: When Schedule is disabled When Schedule is disabled with the centralized controller or the connected unit, Schedule settings...
  • Page 70 [ IV Remote Controller ] <5> Using Power Save Function description Power Save is a function that regulates the compressor rotation count either daily or according to a specified period and according to a preset time interval or regulated capacity. Use this function when you want to inhibit electric power use. A typical scenario where Power Save can be used to inhibit the power consumption for water heating would be periods of particularly heavy operating loads for air conditioning and other equipment, such as periods when large numbers of people check in at a hotel or similar accommodation facility.
  • Page 71 [ IV Remote Controller ] To use demand control on the connected units, make the settings as shown below. (a) To use only connected unit demand control (contact input) without using Power Save on the remote controller Button operation In the Operation setting screen, press the [F1] button to move the cursor to Unit1 Power Save.
  • Page 72 [ IV Remote Controller ] Button operation From the Main menu, select "Schedule" > "Power Save" and press the [Select] Unit1 button. Weekly timer Period timer Power Save Press the [F3] button to proceed to the settings screen. Unit1 Period You can set 2 types of pattern, as necessary.
  • Page 73 [ IV Remote Controller ] In the Operation setting screen, press the [F1] button to move the cursor to Unit1 Power Save. Power Save Press the [F3] button to select "Yes". Schedule Fan Mode Normal Anti-freeze Next <6> Function setting Function description Sets the functions for each connected unit from the remote controller as required.
  • Page 74 [ IV Remote Controller ] Select "Function setting" from the Unit initial set menu, and press the [Select] Unit1 Unit initial set button. Control pattern Unit Setting Function setting Storage Monitor The Function setting screen will be displayed. Unit1 Function setting Press the [F1] or [F2] button to select the connected unit "M-NET address", M-NET address "Function No."...
  • Page 75 [ IV Remote Controller ] <7> Operation status monitoring ▌ Function description Check the function information of each unit from the remote controller Button operation Select "Running information" from the main menu screen, and press the [Select] button. Set the desired M-NET address with the [F2] and [F3] buttons, and press the [Select] button.
  • Page 76 [ IV Remote Controller ] Function setting No. Function setting Description Remarks High pressure operation data [× 0.1 MPa] Low pressure operation data [× 0.1 MPa] Outlet hot water temperature operation data [× 0.1ºC] Data of last hot water storage operation Outdoor air temperature during operation [×...
  • Page 77 [ IV Remote Controller ] - 70 - HWE1517A...
  • Page 78 V Electrical Wiring Diagram [1] Electrical Wiring Diagram....................73 - 71 - HWE1517A...
  • Page 79 - 72 - HWE1517A...

  • Page 80: Electrical Wiring Diagram

    [ V Electrical Wiring Diagram ] V Electrical Wiring Diagram [1] Electrical Wiring Diagram 5 4 3 6 5 4 3 2 5 4 3 2 5 4 3 2 9 10 9 10 9 10 3 4 5 6 7 8 9 4 3 2 1 - 73 - HWE1517A...
  • Page 81 [ V Electrical Wiring Diagram ] - 74 - HWE1517A...
  • Page 82 [ V Electrical Wiring Diagram ] When using a local controller, refer to the table below for the types of input/output signals that are available and the operations that correspond to the signals. External Input/Output Input Dry contact ON (Close) OFF (Open) Terminal type...
  • Page 83 [ V Electrical Wiring Diagram ] Control terminal block (TB4) (Optional flow sensor) Control terminal block (TB8) (No-voltage contact output) Control terminal block (TB5) (Optional thermistor Remote controller) Control terminal block (TB6) (No-voltage contact input) - 76 - HWE1517A...

  • Page 84: Refrigerant Circuit

    VI Refrigerant Circuit [1] Refrigerant Circuit Diagram ..................... 79 [2] Principal Parts and Functions ..................80 - 77 - HWE1517A...
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  • Page 86: Refrigerant Circuit Diagram

    [ VI Refrigerant Circuit ] VI Refrigerant Circuit [1] Refrigerant Circuit Diagram LEV1 Linear expansion valve1 (MAIN) LEV3 Linear expansion valve3 (INJ) PSH1 High-pressure sensor PSL1 Low-pressure sensor solenoid valve1 (defrost) solenoid valve2 (defrost) solenoid valve3 (defrost) solenoid valve4 (defrost) solenoid valve5 (Injection) Compressor discharge temp sensor Compressor suction temp sensor...

  • Page 87: Principal Parts And Functions

    [ VI Refrigerant Circuit ] [2] Principal Parts and Functions Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulat- Low-pressure shell scroll pres- (Comp) ing refrigerant by adjusting the compressor operating frequency based on Wirewound resistance the operating pressure data 20°C[68°F] : 0.092 ohm...
  • Page 88 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermi Degrees Celsius Resistance check stor (Compressor = 15k suction) = 3385 0/80 R = 15 3385 (Heat Exchang- er outlet) 0°C[32°F] :15kohm 10°C[50°F] :9.7kohm (Air-side Heat 20°C[68°F] :6.5kohm Exchanger in- 25°C[77°F] :5.3kohm...
  • Page 89 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) FAN motor Regulates the heat exchanger AC380V, 920W motor capacity by adjusting the oper- ating frequency and operating the propeller fan based on the operating pressure. Linear LEV3 Adjusts the amount of bypass...

  • Page 90: Control

    VII Control [1] Functions and Factory Settings of the Dip switches ............85 [2] Operating characteristics and Control Capabilities ............105 - 83 - HWE1517A...
  • Page 91 - 84 - HWE1517A...

  • Page 92: Functions And Factory Settings Of The Dip Switches

    [ VII Control ] VII Control [1] Functions and Factory Settings of the Dip switches 1. Factory Switch Settings (Dip switch settings table) Factory setting Setting Function Usage MAIN circuit OFF setting ON setting timing Depends on Model setting . s i the unit .
  • Page 93 [ VII Control ] 2. Slide switch (SWS1) settings Individual system SWS1 Setting Unit Operation LOCAL Follows the input signal of the MAIN circuit Ignores the signal input REMOTE Follows the input signal fed through a dry contact interface Multiple system (SWS1 in the SUB circuit on both the main and sub units will be ineffective.) Main unit Sub unit MAIN circuit...
  • Page 94 [ VII Control ] Priority order of the water-temperature-setting-input-signal sources Water temperature can be controlled by using the signals from the four types of input sources listed below. The setting for the item with higher priority will override the settings for the items with lower priorities. The water temperature will be controlled according to the temperature setting in the "Target water temperature"...
  • Page 95 [ VII Control ] 3. Air bleeding operation and flow rate adjustment operation during test run (1)Air bleeding operation Check there is no water leakage during operation. For each circuit, perform at least three sets of at least 5 minutes in duration. During the air bleeding operation, use the method below (*1) to display the water flow rate during operation and check it is stable (no air entrainment).
  • Page 96 [ VII Control ] (*1) Water flow rate display method 1Set the PCB DIP switches as shown below. 2If the flow rate adjustment operation has never been performed, ‘ng’ appears on the PCB’s digital display after the system startup operation. Press SWP1 (up) or SWP2 (down) to delete the ‘ng’ from the PCB’s digital display (changing the display to a value such as 1).
  • Page 97 [ VII Control ] (2)Water flow rate adjustment operation (When the secondury side control is disabled) l a t Check the water level is neither at the full or Water is supplied even when the target water level Water level check empty level.
  • Page 98 [ VII Control ] 4Check the following. Check the checkbox. All places with flow rate valve opening 1000 through 100 are 2 L/min or above? If 2 L/min or below, air may not be bled out. Perform an air bleeding operation and water flow rate adjustment operation again.
  • Page 99 [ VII Control ] (3)Water flow rate adjustment operation (when the secondary side control is enabled) Step Contents Operation and check points Supplemental explanation Check the water level is neither at the full or Water is supplied even when the target Water level check empty level.
  • Page 100 [ VII Control ] Table 1 Primary side circuit flow rate map Close Water flow rate adjust valve opening Open <------------------ ------------------> Pump output opening/water flow rate 1600 1400 1200 1000 adjust valve opening Flow rate (pump output opening 16%) Flow rate (pump output opening 27%) Flow rate (pump output opening 100%) (Check result)
  • Page 101 [ VII Control ] (Note 1) Change SW2-9 and SW2-3 as a stopgap procedure as shown in the table below, and then turn the power on. Multiple unit change-over switch Local/internal change-over switch SW2-9 SW2-3 o i t o i t (Note 2) The table below shows the water flow rate adjustment operation status in 4 figures when the PCB DIP switch is set as shown in Note 3.
  • Page 102 [ VII Control ] (1) Sensor method settings Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF switch is set to OFF. Set the ON/OFF switch (SWS1) to OFF.
  • Page 103 [ VII Control ] (2) Three-sensor method or six-sensor method setting Use the separately sold thermistor (TW-TH16E) to control the water temperature in the storage tank. Setting procedures Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF setting is set to OFF.
  • Page 104 [ VII Control ] Referring to the figure below, configure the settings for each unit according to the system. PAR-W31 Item code Address 1214 M-NET cable * SW2-9: ON (When multiple units are connected) Storage tank Three-sensor method PAR-W31 AE-200 Item code Address 105 106 107 110...
  • Page 105 [ VII Control ] (3) Setting the outlet hot water temperature 1 Selecting the outlet hot water temperature setting method Select one of the following three outlet hot water temperature setting methods. Setting procedures Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF setting is set to OFF.
  • Page 106 [ VII Control ] 2 Outlet hot water temperature setting method from PCB Setting procedures Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF setting is set to OFF. * Set the ON/OFF switch (SWS1) to OFF.
  • Page 107 [ VII Control ] (4) Scheduled operation Configure the schedule settings using a remote controller (PAR-W31MAA) or a system controller (AE-200). (5) Peak-demand control operation Peak-demand control is a function used to control the power consumptions of the units during peak-demand hours. The number of units in operation and the compressor's maximum operating frequency will be controlled according to the peak-demand control signal.
  • Page 108 [ VII Control ] (6) Setting the total number of units for a multiple system Step 0 Set SWS1 to OFF from the remote controller or with the local switch. Settings cannot be changed unless the ON/OFF switch is set to OFF. Set the ON/OFF switch (SWS1) to OFF.
  • Page 109 [ VII Control ] (7) Selecting the item that normally appears on the LED Display content Displays the operation mode.(*1) Displays the operation mode.(*2) Displays the current water temperature. Displays the water-temperature setting. Displays the high and low refrigerant pressures. (*1) The dot lights up when the operation signal is on.
  • Page 110 [ VII Control ] (8) Settings using Analog input Remote water temperature setting input signal type Analog input type can be selected from the following four types: "0": 4-20 mA "1": 0-10 V "2": 1-5 V "3": 2-10 V Select item code 1075 to set the type of analog input signal to be used to set the water temperature from a remote location.
  • Page 111 [ VII Control ] Setting the water temperature using analog signal input Select the analog input format • When the water temperature setting input signal type is set to 0 (4-20 mA) • External analog input signal of between 5.9 and 18.3 mA: the preset temperature will be linearly interpolated. Preset temperature = (B - A) * (Input current - 5.9 mA) / 12.4 mA + A Change of 0.12 mA or less is not recognized.

  • Page 112: Operating Characteristics And Control Capabilities

    [ VII Control ] [2] Operating characteristics and Control Capabilities Outline of Control Method -1- Operating characteristics Function Component Symbol Control/ Unit Trigger condition Detection tion Unit Pressure High-pressure 63H1 HP 63H1 (10.0) protection switch switch OFF MPa 14.0 High-pressure 63HS HP 63HS OFF MPa...
  • Page 113 [ VII Control ] Startup sequence rotation -2- Initial control When the power is turned on, the initial processing of the microcomputer is given top priority. During the initial processing, processing of the operation signal is suspended and is resumed after the initial processing is completed.
  • Page 114 [ VII Control ] Bypass Control -5- Outdoor unit fan The fan's rotation speed will be controlled to approximate the values in the table below that are obtained based on the outside temperature and the low pressure. (Pressures and temperatures will be monitored, and the fan frequency will change accordingly in three steps.) Fan rotation Outdoor temp.(A) Fan rotation...
  • Page 115 [ VII Control ] Refrigerant Recovery Control -8- Operation during power failure Duration of power failure 20 ms or shorter 20 ~ 200ms 200 ms or longer Detection of power failure Undetectable Instantaneous power Detection of power failure failure Operation during power failure Normal During an instanta- All outputs will be turned off immedi-...
  • Page 116 [ VII Control ] Control at Initial Start-up -10- Peak-demand control General idea about demand control in the system with a combination of a heat pump and a combustion-type hot water boiler. →During peak-demand hours, the operation of the air conditioning units is given higher priority than that of the heat pump units. The peak-demand control function is a function that restricts the maximum capacity of the units.
  • Page 117 [ VII Control ] Cooling/heating Circuit Control and General Function of System Equipment -13- System control method Local control method Dry contact input of operation and operation mode commands from the local controller is used to start or end the water heating/hot water storage operation.
  • Page 118 [ VII Control ] Hot water storage operation is started or stopped based on the readings of six water temperature sensors that are installed to the water storage tank. The use of six sensors requires at least two units. When a dry contact input is received from the local controller, the unit will be operated in the hot water storage operation except when it is already operated in the water heating mode.
  • Page 119 [ VII Control ] External water temperature sensor TW-TH16E 1. Parts that are required to install an external water Wire specifications temperature sensor (1) External water temperature sensor Wire size 2-core cable Min. 1.25 mm (2) Wiring to connect the sensor and the unit* Type CVVS or CPEVS (3) Wiring terminals to connect the wiring to the sensor and...

  • Page 120: Test Run Mode

    VIII Test Run Mode [1] Items to be checked before a Test Run ................. 115 [2] Operating the Unit......................117 [3] Refrigerant ........................118 [4] Standard operating characteristics (Reference data) ............ 118 - 113 - HWE1517A...
  • Page 121 - 114 - HWE1517A...

  • Page 122: Items To Be Checked Before A Test Run

    [ VIII Test Run Mode ] VIII Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.
  • Page 123 [ VIII Test Run Mode ] (10) Check that the unit is operating properly according to the temperature adjustment function. When a pull-down operation is completed, check that the hot water temperature adjustment function will come on and that the unit will automatically go on and off.

  • Page 124: Operating The Unit

    [ VIII Test Run Mode ] [2] Operating the Unit 1. Initial Operation (1) Make sure the Run/Stop switch that controls the unit on the local control panel is switched off. (2) Switch on the main power. (3) Leave the main power switched on for at least 12 hours before turning on the Run/Stop switch that controls the unit on the on-site control panel to warm up the compressor.

  • Page 125: Refrigerant

    [ VIII Test Run Mode ] [3] Refrigerant QAHV-N560YA-HPB Unit type Refrigerant type R744 6.5kg Refrigerant charge [4] Standard operating characteristics (Reference data) Reference data Operating condition Unit Ambient °C temperature °C 12.4 Temperature Discharge refrigerant °C Suction refrigerant °C Shell temperature °C...

  • Page 126: Troubleshooting

    IX Troubleshooting [1] Maintenance items......................121 [2] Troubleshooting ......................126 [3] Troubleshooting Principal Parts ..................136 [4] Refrigerant Leak ......................152 [5] Parts Replacement Procedures ..................153 [6] Removing scale from the gas cooler................159 - 119 - HWE1517A...
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  • Page 128: Maintenance Items

    [ IX Troubleshooting ] IX Troubleshooting [1] Maintenance items 1. Checking the error history Take the following steps to view the last six error histories (error codes). Refer to “[2] 2.Diagnosing Problems Using Error Codes” for information about error codes. (page 129) Setting procedure Step 1 Set the dip switches on the circuit board as follows to view error histories.
  • Page 129 [ IX Troubleshooting ] Error history item list Item Item LED display Notes code Error history 1 Error Code Error history 1 details (Inverter error) Error Code Error history 1/Occurrence time Time Error history 2 Error Code Error history 2 details (Inverter error) Error Code Error history 2/Occurrence time Time...
  • Page 130 [ IX Troubleshooting ] 2. Operation status before error Setting procedure Step 1 Set the dip switches on the circuit board as follows to view the operation status before Set the dip switches error. SW2 and SW3. Step 2 Press the push switch SWP3 to toggle through the item codes listed below. Select the desired item with the push switch SWP3.
  • Page 131 [ IX Troubleshooting ] Time of data storage before error Item Item LED display code Current inlet water temperature Twi First decimal place Current outlet water temperature Two First decimal place Outdoor temperature Ta First decimal place TH15 water temperature (unit) First decimal place Refrigerant suction temperature First decimal place...
  • Page 132 [ IX Troubleshooting ] 3. Maintenance setting 1 This category includes items that are set during test run and maintenance. Setting procedure Step 1 Set the dip switches on the circuit board as follows. Set the dip switches SW2 and SW3. By setting SW3-9 to ON after setting the dip switches SW2 and SW3 as shown left, the setting values can be checked.

  • Page 133: Troubleshooting

    [ IX Troubleshooting ] [2] Troubleshooting Troubleshooting according to the remote controller malfunction or the external input error Both for MA remote controller and ME remote controller 1. If a problem occurs, please check the following. If a protection device has tripped and brought the unit to stop (when an error code is blinking on the LED), resolve the cause of the error before resuming operation.
  • Page 134 [ IX Troubleshooting ] Problem Check item Cause Solution The unit has Automatic Start/Stop Water temperature is Normal stopped during thermistor has tripped. high. operation and does not restart. Water temperature is The setting for the automatic Start/Stop Change the setting for the automatic Start/ low.
  • Page 135 [ IX Troubleshooting ] Problem Check item Cause Solution The unit is in Supply-water tempera- The difference be- Water flow shortage on the secondary- Reconfigure the system to increase the operation, but the ture on the secondary tween the supply-water side pump maximum flow rate on the secondary-side secondary circuit...
  • Page 136 [ IX Troubleshooting ] 2. Diagnosing Problems Using Error Codes If a problem occurs, please check the following before calling for service. (1) Check the error code against the table below. (2) Check for possible causes of problems listed in the "Cause" column that correspond to the error code. (3) If the error codes that appear on the display are not listed in the table below, or no problems were found with the items listed in the "Cause"...
  • Page 137 [ IX Troubleshooting ] Error reset *3 Error Unit code *1 Cause Cause side Remote Error type (PCB *2 (PCB) (Installation/Setting error) (Parts problems) Operation M-NET) SWS1 Thermistor t s i fault • If it is detected that the discharge temperature sensor (TH1) is open- or 5101 short-circuited for continuous 20...
  • Page 138 [ IX Troubleshooting ] Error reset *3 Error Unit code *1 Cause Cause side Remote Error type (PCB *2 (PCB) (Installation/Setting error) (Parts problems) Operation M-NET) SWS1 High-pressure sensor fault/high-pressure faul • If it is detected that the high-pressure sensor is 5201 open- or short-circuited for continuous 20 seconds or longer, Error code 5201 will appear, and the unit...
  • Page 139 [ IX Troubleshooting ] Error reset *3 Error Unit code *1 Cause Cause side Remote Error type (PCB *2 (PCB) (Installation/Setting error) (Parts problems) Operation M-NET) SWS1 Inverter Electric • error current • Fan board fault (4255) 4250 related • Ground fault of the compressor errors •...
  • Page 140 [ IX Troubleshooting ] Error reset *3 Error Unit code *1 Cause Cause side Remote Error type (PCB *2 (PCB) (Installation/Setting error) (Parts problems) Operation M-NET) SWS1 Inverter Voltage Bus voltage drop protection Momentary power failure/power failure • INV board CNDC2 wiring fault 4220 Power supply voltage drop (Inter-phase •...
  • Page 141 [ IX Troubleshooting ] Error reset *3 Error Unit code *1 Cause Cause side Remote Error type (PCB *2 (PCB) (Installation/Setting error) (Parts problems) Operation M-NET) SWS1 Remote 6830 controller address. error (incl. Non-consecutive address, system error Address setting error 7109 remote (Non-consecutive address)
  • Page 142 [ IX Troubleshooting ] *1: The codes in the parentheses in the "Error code" column indicate error detail codes. *2: If an error occurs, error codes shown above will appear in the 4-digit digital display on the PCB. *3: Definition of symbols in the "Error reset" column. : Errors that can be reset regardless of the switch settings : Errors that can be reset if the remote reset setting on the unit is set to "Enable"...

  • Page 143: Troubleshooting Principal Parts

    [ IX Troubleshooting ] [3] Troubleshooting Principal Parts High-Pressure Sensor -1- High-Pressure Sensor (63HS) 1. Compare the pressure that is detected by the high pressure sensor, and the high-pressure gauge pressure to check for failure. Error history, temperature and pressure readings of the sensor, and LEV opening High pressure and low pressure will appear alternately on the 7-seg- ment LED at P-second intervals (Default: 3 seconds).
  • Page 144 [ IX Troubleshooting ] Low-Pressure Sensor -2- Low-Pressure Sensor (63LS) 1. Compare the pressure that is detected by the low pressure sensor, and the low pressure gauge pressure to check for failure. Error history, temperature and pressure readings of the sensor, and LEV opening High pressure and low pressure will appear alternately on the 7-seg- ment LED at P-second intervals (Default: 3 seconds).
  • Page 145 [ IX Troubleshooting ] Solenoid Valve -3- Temperature sensor Use the flowchart below to troubleshoot the temperature sensor. Troubleshooting the thermistor (1)Thermistor <Heatsink temperature> :THHS Start Thermistor = 17 kΩ±2% { 4016 ( R = 17 Disconnect the thermistor to be checked from the circuit board. 273 +t Measure the actual temperature of the pipe at the thermistor.
  • Page 146 [ IX Troubleshooting ] -4- LEV 1. General descriptions of the operation of the LEV in the main circuit LEV1 is driven by the pulse signal from the circuit board and is controlled by a stepping motor. The valve opening changes according to the number of pulses 1) Control board and LEV Outdoor control board ø4...
  • Page 147 [ IX Troubleshooting ] 2. General descriptions of injection LEV operation The valve opening changes according to the number of pulses. 1) Control board and LEV Outdoor control board GLAY ø4 BLACK ø3 YELLOW ø2 ø1 ORANGE Connector CNLVC 2) Pulse signal output and valve operation Output pulses change in the following orders when the Output Output state...
  • Page 148 [ IX Troubleshooting ] (1) Judgment methods and possible failure mode Malfunction mode Judgment method Remedy Microcomputer driver cir- Disconnect the control board connector and connect When the drive circuit has a cuit failure the check LED as shown in the figure below. problem, replace the control board.
  • Page 149 [ IX Troubleshooting ] 3. Injection LEV coil removal procedure The LEV consists of a coil and a valve body that can be separated from each other. Body Coils Stopper Lead wire (1) Removing the coils Fasten the body tightly at the bottom (Part A in the figure) so that the body will not move, then pull out the coils toward the top.If the coils are pulled out without the body gripped, undue force will be applied and the pipe will be bent.
  • Page 150 [ IX Troubleshooting ] Inverter -5- Inverter Replace only the compressor if only the compressor is found to be defective. Replace only the fan motor if only the fan motor is found to be defective. Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices.
  • Page 151 [ IX Troubleshooting ] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at [1] Error history 4250, 4255, 4220, 4225, 4230, 4235, 4240, 4245, 5301, 5305, item list. (page 122) 5110, 0403, 4102, 4260, 4265 Take appropriate measures to the error code and the error details in ac- cordance with [2] 2.Diagnosing Problems Using Error Codes.(page...
  • Page 152 [ IX Troubleshooting ] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from (4250 Detail code No. 102, 103, INV board er- the terminals of the 106, and 107) ror detection INV board (SC-U,...
  • Page 153 [ IX Troubleshooting ] Items to be checked Phenomena Remedy Put the outdoor unit into oper- Overcurrent-related problems oc- a. Check items [1] through [3] Check whether ation. cur immediately after compressor for problems. the inverter is Check the inverter output volt- startup.
  • Page 154 [ IX Troubleshooting ] (3) Trouble treatment when the main power breaker is tripped Items to be checked Phenomena Remedy Check the breaker capacity. Use of a non-specified break- Replace it with a specified breaker. Perform Meg check between the Zero to several ohm, or Meg Check each part and wiring.
  • Page 155 [ IX Troubleshooting ] (5) Simple checking procedure for individual components of main inverter circuit Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less. Part name Judgment method IGBT module...
  • Page 156 [ IX Troubleshooting ] Judgment value (reference) Black ( + ) SC-P1 FT-N SC-L1 SC-L2 SC-L3 SC-P1 5 - 200 ohm 5 - 200 ohm 5 - 200 ohm FT-N Red (-) SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black ( + )
  • Page 157 [ IX Troubleshooting ] Control Circuit -6- Control Circuit Troubleshooting transmission power circuit of outdoor unit Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem.
  • Page 158 [ IX Troubleshooting ] Outdoor Unit Fan -7- Troubleshooting 1. Important notes If the unit or its refrigerant circuit components experience malfunctions, take the following steps to prevent recurrence. (1) Diagnose the problem and find the cause. (2) Before repairing leaks on the brazed sections on the pipes, recover the refrigerant. Braze under nitrogen purge to prevent oxidation.

  • Page 159: Refrigerant Leak

    • It may also be in violation of applicable laws. • MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the use of the wrong type of refrigerant.

  • Page 160: Parts Replacement Procedures

    [ IX Troubleshooting ] [5] Parts Replacement Procedures Replacement instructions for the gas cooler [QAHV-N560YA-HPB] Step No. Procedure Remove the front panels 1, 2, and 3 from the unit (1 6 screws, 2 5 screws, 3 3 screws). Remove the main box cover (4 screws).
  • Page 161 [ IX Troubleshooting ] Replacement instructions for the gas cooler [QAHV-N560YA-HPB] Step No. Procedure Remove the pipes from the four sections encircled in the figure below (refer to the replacement procedures for refrigerant circuit components), pull out the pipes indicated by the black rectangle in the figure below, and pull the gas cooler forward.
  • Page 162 [ IX Troubleshooting ] Replacement instructions for the compressor [QAHV-N560YA-HPB] Step No. Procedure [Parts preparation] Each unit requires the following parts. Parts to prepare as necessary Compressor suction pipe Compressor discharge pipe Scroll compressor Plastic band Parts code: R12 006 011...
  • Page 163 [ IX Troubleshooting ] Replacement instructions for the compressor [QAHV-N560YA-HPB] Step No. Procedure Remove the pipes c, d, e, and f from the compressor. Remove the compressor by removing the compressor fixing fittings with a spanner. (Refer to the replacement procedures for refrigerant circuit components.)
  • Page 164 [ IX Troubleshooting ] Replacement instructions for the solenoid valves and LEVs [QAHV-N560YA-HPB] Step No. Procedure Remove the front panels 1 and 2 [1 6 screws ,2 5 screws], the main box cover [4 screws], and the snow guard [1 screw].
  • Page 165 [ IX Troubleshooting ] Replacement instructions for the solenoid valves and LEVs [QAHV-N560YA-HPB] Step No. Procedure To replace LEV1, remove LEV3 by debrazing the areas encircled in the figure below. To replace SV2, remove the servicing pipe by debrazing the areas encircled in the figure below.

  • Page 166: Removing Scale From The Gas Cooler

    [ IX Troubleshooting ] [6] Removing scale from the gas cooler 1. General workflow: From determining the need for cleaning up to the completion of cleaning (1) Determining the need for cleaning (periodical inspection) (2) Preparing for cleaning (items to be prepared) (3) Setting up the cleaning water circuit Starting cleaning When to stop...
  • Page 167 [ IX Troubleshooting ] 2. Detailed workflow: From determining the need for cleaning up to the completion of cleaning Explained below are details of steps (1) through (6) in the previous page. (1) Determining the need for cleaning *Removal procedure for short pipe for checking the presence of scale 1) Shut off the power to the unit, close the valves at the hot water supply port, feed water port, and circulation water inlet before proceeding to the next step.
  • Page 168 [ IX Troubleshooting ] (3) Setting up the cleaning water circuit Heat pump unit Gas cooler Hot water supply port (to hot water tank) Water inlet Figure 2: Valves to be closed and connections of cleaning water circuit Figure 2 symbol explanation 1 Connection to cleaning water circuit outlet 2 Connection to cleaning water circuit inlet 3 Hot water supply valve 4 Water inlet valve...
  • Page 169 [ IX Troubleshooting ] (1) Remove the cover from the water pipe box 1. Hot water outlet pipe 1 Cover 2 Water inlet pipe (2) Remove the water inlet pipe 2 by removing the saddle 3 and quick fastener (for straight pipe) 4. (3) Remove the gas cooler inlet pipe 6 by removing the quick fastener 5 (for reduced pipe).
  • Page 170 [ IX Troubleshooting ] Set up the cleaning water circuit as shown in Figure 3. Numbers 1 through 4 in the figure indicate the following items. 1 Container (for cleaning) 2 Pump Gas cooler inlet Hot water 3 Submersible pump (placed in the container 1 for supply port exhaust water) 4 Container for exhaust water (also used to temporarily...
  • Page 171 [ IX Troubleshooting ] Connect the container to collect used cleaning water as shown in Figure 4. Exhaust water drainage route (See Figure 4.): (1→2→Heat pump Gas cooler inlet unit→4) Using a submersible pump, drain the cleaning water in the cleaning Hot water supply port water tank to the exhaust water tank.

  • Page 172: Attachments

    X Attachments [1] R744 refrigerant saturation temperature table ............... 167 - 165 - HWE1517A...
  • Page 173 - 166 - HWE1517A...

  • Page 174: R744 Refrigerant Saturation Temperature Table

    [ X Attachments ] X Attachments [1] R744 refrigerant saturation temperature table Pressure Temp. Pressure Temp. Pressure Temp. Pressure Temp. Pressure Temp. Pressure Temp. MPag °C MPag °C MPag °C MPag °C MPag °C MPag °C 0.50 -53.12 1.82 -20.83 3.14 -2.73 4.46...
  • Page 175 [ X Attachments ] - 168 - HWE1517A...

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