35
ALARM CODE DESCRIPTION (CONT.)
DESCRIPTION
Low oil pressure compr B2
Evaporator frost protection
Condenser frost protection, circuit
A
Condenser frost protection, circuit
B
Evaporator water flow control
failure
Condenser water flow loss
High current, compressor A1
High current, compressor A2
High current, compressor B1
High current, compressor B2
Pump 1 fault
Pump 2 fault
Heat reclaim mode fault, circuit A
Heat reclaim mode fault, circuit B
Water flow fault, heat reclaim
condenser
Master/slave configuration fault
Maintenance alert
Charge too low
Water loop too low
Air filter maintenance delay elapsed
Pump 1 maintenance delay elapsed
Pump 2 maintenance delay elapsed
Water filter maintenance delay
elapsed
WHY WAS THIS ALARM
GENERATED?
Oil pressure differential below the setpoint
(dynamically calculated) for 15 se
conds
1 - Evaporator EWT or LWT below defrost
setpoint
2 - On units equipped with an evaporator
heater, heater operates for more than 15
minutes but does ot heat the evaporator
For water-cooled units and fluid type =
water, if SCT<1,1°C
For water-cooled units and fluid type =
water, if SCT<1,1°C
1 - Control not closed, before end of the
start-up delay or open during operation
2 - Pump shut down for 2 mins and water
flow contact closed
Water flow switch (water-cooled units) not
closed during the minute after start-up
Current higher than threshold value detected
Ditto
Ditto
Ditto
Evaporator water pump contact open, when
the pump has received a command to run
Ditto
1. Interlock not closed 1 minute after
condenser pump start-up or open during
heat reclaim operation
2. More than two consecutive pumpdown
sequences not successful.
Ditto
Water flow detector (water-cooled units) not
closed for one minute
Bad master/slave configuration
A maintenance alert is active
ACTION TAKEN BY
THE CONTROL
Compressor B2 shut down
Unit shut down. Evaporator
pump and if applicable heater
start-up, if unit has shut down
air-cooled units)
Unit shut down. Condenser
pump start-up, if unit has
shut down
Unit shut down. Condenser
pump start-up, if unit has shut
down
Unit shut down. Pump shut
down
Unit shut down
Compressor A1 shut down
Compressor A2 shut down
Compressor B1 shut down
Compressor B2 shut down
Unit shut down
Ditto
Circuit A remains in cooling
mode
Circuit B remains in cooling
mode
Unit remains in cooling mode
Master/slave control not
allowed
None
RESET
TYPE
Auto if the
same alarm
has not
tripped the
same day
Ditto
Automatic
Automatic
Manual
Manual
Auto after
10 mn
delay
Ditto
Ditto
Ditto
Manual
Manual
Manual
Manual
Manual
Auto/
manual for
heating/
cooling
mode fault
Manual
ALARM
CODE
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86-nn
87-n
87-1
87-2
87-3
87-4
87-5
87-6
PROBABLE CAUSE
Ditto
Defective thermistor, low water flow
Discharge pressure
transducer defective,
refrigerant leak or low
condenser water temperature
Ditto
Evaporator pump control or
water flow switch failure
Condenser pump, low water
flow, water flow switch
Operation above the compressor
capacity
Ditto
Ditto
Ditto
Pump overheat or bad pump
connection
Ditto
1. Water flow switch defective.
2. Leak or heat reclaim shutoff or
drain solenoid valve open.
Ditto
Ditto
Master/slave configuration error
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