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The 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.
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Locate the labels attached to each sensor. One
sensor will be identified as the Return Sensor and
one will be identified as the Supply Sensor. (Fig.
7A & 7B) Mount the Return Sensor to the return
piping of the boiler loop. Mount the Supply Sensor
to supply piping of the system loop.
Figure 7A
- Return Sensor Label
Figure 7B
- Supply Sensor Label
Optional Boiler On/Off Output:
The boiler terminals are used to activate a boiler when
the pump is ramped to the boiler enable percentage
30% and is shut off when the pump is ramped to 50%
of the boiler enable percentage. The boiler enable
includes a minimum "ON" time of 3 minutes and a mini-
mum "OFF" time of 20 seconds. Connect field wiring
to control box terminals Boil & Boil (not polar sensitive)
(Fig. 8).
Optional Zone Control Input:
Connect field wiring 24 V (ac) power supply or heat
demand to control box terminals “DEM” and “DEM” (not
polar sensitive) (Fig. 8).
