58
Table 40 — Troubleshooting
Table 41 — Alarm Codes
See legend on page 59.
SYMPTOM
POSSIBLE CAUSE
POSSIBLE REMEDY
Unit Does Not Run
Check for power to unit
• Check overcurrent protection device.
• Check non-fused disconnect (if equipped).
• Restore power to unit.
Low refrigerant charge
Check for leak and add refrigerant.
Wrong or incorrect unit configuration
Check unit configuration.
Active alarm
Check Alarm status. See separate Alarm and follow troubleshooting
instructions.
Active operating mode
Check for Operating Modes. See Operating Modes and follow trouble-
shooting instructions. Check capacity control overrides.
Unit Operates too Long or
Continuously
Low refrigerant charge
Check for leak and add refrigerant.
Compressor or control contacts welded Replace contactor or relay.
Air in chilled water loop
Purge water loop.
Non-condensables in refrigerant circuit. Remove refrigerant and recharge.
Inoperative EXV
• Check EXV, clean or replace.
• Check EXV cable, replace if necessary.
• Check EXV board for output signal.
Circuit Does Not Run
Active alarm
Check Alarm status. See separate Alarm and follow troubleshooting
instructions.
Active operating mode
Check for Operating Modes. See Operating Modes and follow trouble-
shooting instructions.
Circuit Does Not Load
Active alarm
Check Alarm status. See separate Alarm and follow troubleshooting
instructions.
Active operating mode
Check for Operating Modes. See Operating Modes and follow trouble-
shooting instructions.
Low saturated suction temperature
See Operating Modes 21, 22 and 23.
High circuit suction superheat
The circuit capacity is not allowed increase if circuit superheat is greater
than 36 F (20 C). See Alarms P.08, P.09 and P.10 for potential causes.
Low suction superheat
The circuit capacity is not allowed to increase if the circuit superheat is
less than 5 F (2.8 C). See Alarms P.11, P.12 and P.13 for potential causes.
Compressor Does Not Run
Active alarm
Check Alarm status. See separate Alarm and follow troubleshooting
instructions.
Active operating mode
Check for Operating Modes. See Operating Modes and follow trouble-
shooting instructions.
Inoperative compressor contactor
• Check control wiring.
• Check scroll protection module.
• Check contactor operation, replace if necessary.
Chilled Water Pump is ON,
but the Machine is OFF
Cooler freeze protection
Chilled water loop temperature too low. Check cooler heater.
PREFIX
CODE
SUFFIX
CODE
DESCRIPTION
REASON FOR ALARM
ACTION TAKEN
BY CONTROL
RESET
TYPE
PROBABLE CAUSE
A1
A2
A3
A4
B1
B2
B3
B4
C1
C2
C3
C4
.01
Compressor nn Motor
Temperature Too High
Compressor Motor
Sensor PTC resistance
is greater than 4.5k
Circuit shut down
or not allowed to
start
Manual
Compressor failure,
wiring error, operation
outside of limits, improper
refrigerant charge
.02
Compressor nn Crankcase
Heater Failure
Crankcase heater
current not detected
when required or
detected when not
required.
Circuit shut down
or not allowed to
start
Manual
Wiring error, failed
crankcase heater,
failed SPM.
.03
Compressor nn High Pressure
Switch
High Pressure Switch
open.
Circuit shut down
or not allowed to
start
Manual
Wiring error, closed/
restricted discharge
valve, improper
refrigerant charge,
dirty condenser coils,
failed outdoor fan motor,
discharge pressure
transducer inaccuracy
.04
Compressor nn Motor Sensor
PTC Out of Range
Compressor Motor
Sensor PTC resistance
is less than 50
or
greater than 17k
.
Circuit shut down
or not allowed to
start
Manual
Wiring error, operation
outside of limits, com-
pressor failure, improper
refrigerant charge
.05
Compressor nn Power Reset
24-VAC power lost to
SPM board.
Compressor shut
down or not
allowed to start
Automatic
Low voltage from main
power supply.
.06
Compressor nn Low Control
Voltage Alert
24-VAC power to SPM
board too low.
Compressor shut
down or not
allowed to start
Automatic
Low voltage from main
power supply.
Содержание AQUASNAP 30RBA315
Страница 77: ...77 Fig 37 Control Schematic 30RB060 080 a30 4619...
Страница 78: ...78 Fig 38 Control Schematic 30RB090 150 a30 4620...
Страница 79: ...79 Fig 39 Control Schematic 30RB160 190 a30 4622...
Страница 80: ...80 Fig 40 Control Schematic 30RB210 300 a30 4622...
Страница 81: ...81 Fig 41 Heat Reclaim Control Schematic a30 4622...