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SpaceKeeper Console (SKC) – Installation Operation Maintenance Manual
© Copyright 2013 CGC Group Inc. Installation Operation Maintenance Manual is Subject to Change without Notice Last Revised Nov 15, 2019
Ta, Tr, And Tw are 10k Ohm NTP thermistors, while Co is a 100 Ohm NPT thermistor. These
Inputs do not have LED indicators.
FAN OPERATION
1.
A call on “G” for fan on the thermostat terminal strip will cause the fan to operate
continuously on low fan speed through K5 on multi speed units.
2.
A call on “W” for heat on the thermostat terminal strip will also cause the fan to
operate on low speed. If the heating call is still present after a 10 minute period, the
multi speed units will switch the fan to high speed through Relay K6.
3.
A call on “Y” for cooling on the thermostat terminal strip will cause the fan on multi-
speed units to immediately step up to high speed through Relay K6.
4.
Fan operation will terminate whenever all calls are dropped.
5.
When the fan is operating at high speed, both relays are energized along with their
associated LED indicators.
HEATING OPERATION
1.
A call on “W” for heat will activate the fan at low speed. It will also simultaneously
energize the heat relay K2 and its associated LED. The relay K2 will provide 24V AC fused
power directly to the heat valve.
COOL START UP
1.
A call on “Y” for cooling initiates a series of checks prior to the start up of the
compressor. These checks include:
a.
Power ON timer – Compressor operation is delayed for approximately 5 minutes
after restoration of power. This prevents all units from coming on line at the
same time when power is restored. It also prevents compressor jolting with
intermittent power.
b.
Anti-Recycle timer – There is a 5-minute anti-recycle delay timer that allows the
refrigeration cycle to achieve pressure equalization so that the compressor is
unloaded upon start up.
c.
High Pressure Switch – The high refrigerant pressure switch must be closed prior
to start. LED 11 will be ON.
d.
Low Pressure Switch – The low pressure switch operates primarily as a loss of
charge protector. It must be closed for compressor start up and its LED 12 will
be ON. The pressure switch has a 5 minute time ignore subsequent to start-up.
In some situations, particularly when the unit is cold, the pressure switch will
