SpaceKeeper Cons ole (SKC) – Ins tallation Operation Maintenance Manual
11
OPERATION
prior to installation of a third party supplied controller, it be checked for
compatibility. CGC can confirm this .
6. Relay s witched controllers – This type of controller works well with CGC
devices .
Shutdown Output
The CGC board has an optional input terminal s trip that allows for two types of remote
s hutdown. Thes e are: a) compres s or s hutdown and b) unit s hutdown.
The advantage of thes e inputs is that many units can be connected in parallel and when
powered by an independent 24V AC s ignal one or both of thes e actions can be
implemented. Common us es are:
a) Duty cycling for demand control
b) Global night s etback
c) Heating only mode during emergency power periods
The CGC controller is als o set up s o thes e s hutdown functions can be initiated
individually with on board 24V power. This capability allows unit or compres sor
s hutdown bas ed on a door s witch, a light switch, or occupancy s witch. A s eparate 24V
power s upply is required if two or more units are being shutdown.
Fault Alarm Output
The CGC board is provided with a fault alarm indicator and output. The fault alarm
relay provides normally open and normally clos ed contacts for us e in trans mitting
fault conditions .
NOTE:
The fault alarm is energized for NORMAL, and de-energized for fault. As s uch, if
the unit is not powered, if the board fus e is blown, or if the electronics are damaged,
a fault condition will be indicated.
The fault relay is paralleled with the Fault LED which will be ON when no fault
condition exis ts .
Some fault conditions include:
a.
Hard lockout due to high or low pres sure s witch being open for 10 minutes or
longer.
b.
Hard lockout due to three high or low pres sure s hutdowns in a 24 hour period.
c.
High level condens ate for a period in excess of 15 minutes .
