15
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
open during start-up. If the switch does not remake with the 5 minute ignore
period, the compressor will immediately be stopped.
e.
Air temperature sensor Ta – Sensor Ta will prevent compressor operation if the
air flowing through the unit is below 60
F (15
C).
f.
Water temperature sensor Tw – Sensor Tw will prevent compressor operation if
the outgoing fluid temperature is above 125
F (52
C).
g.
Refrigerant temperature sensor Tr – Sensor Tr will prevent compressor
operation if the coil temperature is below 35
F (2
C).
h.
Any of the above faults will be indicated with the Diagnostic Code described
under the DIAGNOSTICS section.
COOL OPERATION
1.
Monitoring of the refrigerant cycle continues during operation of the compressor. The
following malfunctions will cause the compressor to shutdown:
a.
If the head pressure exceeds the set point of the high pressure switch, the
switch will open and the control board will terminate the compressor operation
within 10 seconds. At this time a flash code of 6 will be initiated on the red
diagnostic LED 15. Compressor operation will be restored in accordance with the
“Intelligent reset” algorithm.
b.
If the suction pressure drops below the set point of the low pressure switch, the
switch will open and if it remains open beyond the 5 minute ignore period after
start up, compressor operation will be terminated within 10 seconds.
Compressor operation will be restored in accordance with the “Intelligent Reset”
algorithm. A flash code of 5 on the red diagnostic LED 15 will be initiated at this
time.
c.
Intelligent Reset Algorithm – If a low or high pressure switch opens and remains
open for more than 10 minutes, a hard lockout will be initiated and the cooling
mode will be locked off until the controls are manually reset. At the same time
the fault relay K3 will be set to alarm; however, if the open switch closes within
10 minutes a restart cycle is initiated. The restart cycle begins with a 10 minute
delay after which if there is a cool call in place and all other enablers are within
the start parameters, the compressor will again be put into operation. Should
either of the pressure switches open again, the shutdown procedure will cycle
again, followed by a restart. The intelligent reset will allow two open switch
shutdowns and restarts in a 24 hour period and a third shutdown within 24
hours will put the refrigeration system into a full and hard lockout, requiring a
power down to reset. If two or less switch open shutdowns occur within a 24
hour period, they will be erased from memory and will not contribute to a
future hard lockout. (A hard lockout will prevent compressor operation until the
