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• Minimum primary water circuit volume is 40 litres
• Water pressure at the QAHV must be <5Bar
• Maximum flowrate in the primary & secondary circuit is 30L/Min
• Nominal primary circuit flow rate is 17L/M and can achieve a 77KPa head at this flow rate
• Size the primary system pressure drop at 77KPa and 17L/M.
• A total of 60m equivalent pipe length is available between the heat-pump and the hot water
storage (or secondary plate heat exchanger). That is a total of 120m between the flow and the
return. For every pair of bends (1 bend on the flow and 1 bend on the return), the maximum
length must be reduced by 3.2m.
*Note this example the field supplied PHEX, and pumps are NOT controlled by the QAHV or ME
equipment
Notes:
• Pumped return to enter in the bottom of the tank before the last tank to prevent de-stratification.
• Adequate provision should be made to prevent condensate from collecting around the outdoor
units.
• It is the responsibility of the installing contractor to provide adequate protection against freezing
of pipe work. If the water circuit freezes and damages the equipment the warranty will become
void.
• All water systems should be designed, installed and commissioned in accordance with industry
good practice guidelines, such as, but not limited to: BSRIA Guide BG2/2010 - Water System
Commissioning, BSRIA Guide BG29/2011 - Pre-Commissioning of Pipework Systems, BSRIA Guide
BG50/2013 - Water Treatment for Closed Heating & Cooling Systems, CIBSE Commissioning Code
W - Water distribution systems, CIBSE Heat Networks: Code of Practice for the UK CP1 2015
• The contractor should make the necessary arrangements to ensure the design of the system
meets the requirement of the application and comply with all current building regulations.
• All electrical work must be carried out in accordance with the current version of BS7671.
• 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. (The compressor
will not be warmed up if initial settings have not been made. Make sure to make initial settings.)
• The unit features a circuit that protects the compressor from short cycling. Once the compressor
stops, it will not start up again for up to 10 minutes. If the unit does not start when the ON/OFF
switch is turned on, leave the switch turned on for 10 minutes. The unit will automatically start up
within 10 minutes.
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