CG-SVX17D-EN 81
Installation - Electrical
NOTICE:
Heat Tape!
Control panel main processor does not check for loss of power to the heat tape nor does it verify
thermostat operation. A qualified technician must verify power to the heat tape and confirm
operation of the heat tape thermostat to avoid catastrophic damage to the evaporator or partial
heat recovery heat exchanger.
Heater Power Supply
The evaporator shell is insulated from ambient air and protected from freezing temperatures by a
thermostatically-controlled immersion heater and strip heaters on the piping. When ever the
ambient temperature drops to approximately 37°F (2.8°C) the thermostat energizes the heaters.
The heaters will provide protection from ambient temperatures down to -20°F (-29°C).
It is required to provide an independent power source (115V 60-Hz-20 amp, 50Hz-15 amp), with a
fused-disconnect to the heaters. The heaters are factory-wired back to the unit control panel.
Note: If evaporator is drained, the heater must be turned off in order to avoid damaging the
evaporator. The heater should only be on when the evaporator has water in it.
Partial Heat Recovery Power Supply
The partial heat recover heat exchanger is insulated from ambient air and protected from freezing
temperatures by an immersion heater. When the ambient air temperature drops to approximately
37°F (2.8°C) the thermostat energizes the heaters. The heaters will provide protection from ambient
temperatures down to -20°F (-29°C).
It is required to provide an independent power source (115V 60-Hz-20 amp, 50Hz-15 amp), with a
fused-disconnect to the heater. The heaters are factory-wired back to the unit control panel.
Note: If partial heat recovery heat exchanger is drained, the heater must be turned off in order to
avoid damaging the partial heat recovery heat exchanger. The heater should only be on
when the heat recovery heat exchanger has water in it.
Water Pump Power Supply
Provide power supply wiring with disconnect for the chilled water pump(s).
Interconnecting Wiring
Chilled Water Flow (Pump) Interlock
All CGAM model chillers have a factory-installed flow switch. In addition, it is recommended to use
an additional field-supplied control voltage contact input through an auxiliary contact to prove
flow. Connect the auxiliary contact to 1X5-3 and 1X5-9. Refer to the field wiring for details. The
auxiliary contact can be a BAS signal, starter contactor auxiliary or any signal which indicates the
pump is running.
Chilled Water Pump Control
An evaporator water pump output relay closes when the chiller is given a signal to go into the Auto
mode of operation from any source. The contact is opened to turn off the pump in the event of most
machine level diagnostics to prevent the build up of pump heat.
The relay output from 1A9 is required to operate the Evaporator Water Pump (EWP) contactor.
Contacts should be compatible with 115/240 VAC control circuit. Normally, the EWP relay follows
the AUTO mode of the chiller. Whenever the chiller has no diagnostics and is in the AUTO mode,
regardless of where the auto command is coming from, the normally open relay is energized. When
the chiller exits the AUTO mode, the relay is timed to open in an adjustable (using TechView) 0 to
30 minutes. The non-AUTO modes in which the pump is stopped, include Reset, Stop, External
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