BULLDOG SpaceKeeper Vertical – Installation Operation Maintenance Manual
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© Copyright 2013 CGC Group Inc Installation Operation Maintenance Manual is Subject to Change without Notice- Last Revised Oct 1, 2014
up. If the switch does not close within the 5 minute ignore period, the compressor will
immediately be turned off. Low pressure switch opens at 60 ± 3 psi and closes at 90 ± 3
psi.
e.
Air temperature sensor Ta – Sensor Ta will prevent compressor start-up if the air
flowing through the unit is below 55
F. The sensor will also prevent the compressor
startup or discontinue compressor operation if the air temperature is above 140
F and
will reset at 135
F. A flash code of 4 will be initiated on the red diagnostic LED 15.
f.
Water temperature sensor Tw – Sensor Tw will prevent compressor start-up and trip
an alarm (a flash code of 3) if the outgoing fluid temperature is above 125
F and will
reset the alarm at 120
F. The sensor will also trip at startup and during operation if the
water temperature is below 55
F and will reset at 60
F.
g.
Refrigerant temperature sensor Tr – Sensor Tr will prevent compressor start-up if the
coil temperature is below 40
F and resets at 65ᵒF. A flash code of 2 will be initiated on
the red diagnostic LED 15.
Any of the above faults will be indicated via the diagnostic LED and the appropriate
diagnostic flash code. Please note the temperatures provided might vary by ±5
F.
COOL OPERATION
2.
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” (see below).
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 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
