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• Do not use unless you know the safe and proper operation of equipment required for installation.
• It is the installers responsibility to ensure that this product is safely installed according to all applicable codes
and standards.
Wiring the Outdoor Sensor (7738003452)
• Connect 18 AWG or similar wire to the two terminals provided
in the enclosure & run the wires from the sensor to the
control. Do not run the wires parallel to telephone or power
cables. If the sensor wires are located in an area with strong
sources of electromagnetic interference (EMI), shielded
cable or twisted pair should be used or the wires can be
run in a grounded metal conduit. If using shielded cable,
the shield wire should be connected to the Com terminal
on the control & not to earth ground.
• Replace the front cover of the sensor enclosure.
• Connect one wire from the outdoor sensor to the Outdoor
terminal 17 on the Heatronic 4000.
Mounting the Universal Sensors (7738003451) ----------------- --- --- - --- --- --- --- -- - --- -------- --- -------- -- --- ----- --
These sensors are designed to mount on a pipe or in a tem-
perature immersion well.
The Universal Sensor should be placed downstream of a pump
or after an elbow or similar fitting. This is especially important
if large diameter pipes are used as the thermal stratification
within the pipe can result in erroneous sensor readings. Proper
sensor location requires that the fluid is thoroughly mixed within
the pipe before it reaches the sensor.
Strapped to Pipe
The Universal Sensor can be strapped directly to the pipe
using the cable tie provided. Insulation should be placed
around the sensor to reduce the effect of air currents on the
sensor measurement.
Wiring Boiler Outlet Sensors (7738003451)
Up to 4 boiler outlet sensors can be wired to the Heatronic 4000. These connections are not polarity
sensitive.
• Connect one wire from the outlet sensor for boiler 1 to the Boil 1 Out terminal 26.
• Connect the second wire from the outlet sensor for boiler 1 to the Com terminal 28.
• Repeat for additional boiler outlet sensors using terminal sets 27 & 28, 29 & 31, 30 & 31.
Heatronic 4000
• Connect the second wire to the Com terminal 19.
----------------- --- --- --- --- --- --- --- --- --- ---- --- --- --- --- -- - --- --- ----
Immersion Well
If a Universal Sensor is mounted onto 1" (25 mm) diameter L
type copper pipe, there is approximately an 8 second delay
between a sudden change in water temperature & the time
the sensor measures the temperature change. This delay
increases considerably when mild steel (black iron) pipe is
used. In general, it is recommended that a temperature well
be used for steel pipe of diameter greater than 1-1/4" (32
mm). Temperature wells are also recommended when large
diameter pipes are used & fluid stratification is present. If the
well is not a snug fit on the sensor tube, use the heat transfer
paste supplied with the product. Apply paste to the sides of the
sensor and place a pea-sized globule on the sensor tip. Push
the sensor into the well and when it bottoms out, press firmly.
The paste will be forced up the sides of the well.
26 of 60
Wires from outdoor
sensor and sensor
S1
common terminals on
Heatronic control
S1
Sensor is built into
the enclosure
BTC461503101C | 6720810369 (2018/03)
Terminals 17, 19
Out
Prim
Com
doo r
Sup
(-)
17
18
19
No Pow er
Terminals 26 to 31
Boi l 1
Boi l 2
Com
Boi l 3
Boi l 4
Com
Out
Out
Out
Out
26
27
28
29
30
31
N o Pow er
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