Heatcraft Refrigeration Products BEACON II H-IM-79E - Manual (Page 23)

23
Beacon II Troubleshooting Guide
Diagnostics
Expansion Valve Capacity
Part Number 100 BTUH 100 BTUH 100 BTUH 100 BTUH
29326101 0.44 5220 0.41 4920 0.31 3690 0.27 3230
29326201 4.25 51000 4.00 47900 3.00 36000 2.67 32000
29326401 8.02 90240 7.54 90480 5.65 67800 5.01 60120
29326501 15.13 181680 14.25 171000 10.69 128280 9.47 113640
29326601 22.18 266160 20.87 250440 15.65 187800 13.86 166320
R-22 R-404A / R-507
Evaporator Temperature (°F.) Evaporator Temperature (°F.)
+20 -20 +20 -20
Pressure Drop Across Valve (psi) Pressure Drop Across Valve (psi)
PROBLEM Step ACTION ITEM IF OK IF NOT OK
1. Check Primary Power Supply Disconnect 1. Check fuses and circuit breakers
2. Check Voltage to Evaporator Transformer Go to 2. Check field wiring for breaks
LED is not lit. 3. Check Transformer Secondary Output Volts next step 3. Replace if necessary
4. Check Voltage at Control Board (24V and C) 4. Check factory wiring and connections
5. Replace Control Board
1. Check Compressor internal overloads 1. Wait for reset
2. Check Control Power to Condensing Unit 2. Check transformer voltage (secondary and
LED shows Coo, but (24 Volts across “COMP” and “C” at board) Go to primary) and wiring of 208V power taps.
compressor will not run. 3. Check Compressor Contactor Coil Voltage next step 3. Check internal condensing unit wiring
4. Check Compressor Contactor “pulled in” 4. Replace as needed
ERROR CODES:
E1 Room Sensor Check Sensor and Board Connection Replace as needed
E2 Defrost Sensor Check Sensor and Board Connection Replace as needed
E3 Suction Sensor Check Sensor and Board Connection Replace as needed
E4 Suction Transducer Check Transducer and Board Connection Replace as needed
E5 Outdoor Sensor Check Sensor, wiring and Board Connection Replace or remove
1. Check Refrigerant Type 1. Compare board setpoint and refrigerant
2. Check coil for ice 2. Defrost coil and check defrost cycle
settings/setpoints, defrost sensor and
heater amps.
E6 Low Superheat 3. Check Control Board step position from 3. Replace board if EEV steps not at 2.
During Cooling board LED Go to 4. Pumpdown system see if LPS opens or if it
(0°F for 2 minutes) 4. Check Electric Expansion Valve Closure next step times out (EEV is bad or LPS is set
incorrectly, if times out) – See Pumpdown.
5. Compressor Not Operating 5. Check overloads and contactor.
6. Check Suction Temperature Sensor 6. Compare board sensor reading against
actual suction line temperature.
7. Check Suction Pressure Transducer 7. Compare pressure reading against gauges.