RTAD-SVX01F-E4 51
Installation - Electrical
Figure 25 - Control wiring for pump
Specification for Total Heat Recovery
units
The heat recovery mode should be
validated by a dry contact supplied
by the field. The chiller will run in
heat recovery mode if the dry
contact is closed and if there is a
need for cooling. A 3-way valve will
protect the operation of the chiller
when the return hot water
temperature is too low. This 3-way
valve will not be used if a variable
speed pump is used. In this case,
the control module for Heat
Recovery (A70) will provide a 2-10V
output proportional to the water
flow.
Note: the hot water pump should
run at least 3 minutes after heat
recovery mode is off. During these
3 minutes, the water flow through
the heat recovery condenser will
gradually be reduced to switch
smoothly to the conventional
cooling mode. See Figure 25 for
details.
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