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Resumen del manual
Compressor contactor coil shorted 2. Electrical load too high for PROT circuit (maximum 1 Amp) 3. 24 V AC wired directly to PROT terminal Yellow “ALERT” System Pressure Trip1. High head pressure Flash Code 2 Discharge pressure out of limits or compressor overload (if no high pressureswitch in system) LOCKOUT 2. Condenser coil poor air circulation (dirty, blocked, damaged) 3. Condenser fan is not running 4. If low pressure switch is open: Refer to Code 3 for troubleshooting Yellow “ALERT” Short Cycling 1. If low pressure switch is open: Flash Code 3 Compressor is running only briefly LOCKOUT a. Low refrigerant charge b. Evaporator blower is not running c. Evaporator coil is frozen d. Faulty metering device e. Condenser coil is dirty f. Liquid line restriction (filter drier blocked if present) 2. If high pressure switch is open, go to Flash Code 2 information 3. Intermittent thermostat demand signal 4. System or control board defective Yellow “ALERT” Flash Code 4 Locked Rotor LOCKOUT 1. Low line voltage to compressor 2. Excessive liquid refrigerant in compressor 3. Compressor bearings are seized Yellow “ALERT” Open Circuit 1. Condensing unit power disconnect is open Flash Code 5 2. Compressor circuit breaker or fuses are open 3. Compressor contactor has failed open 4. High pressure switch is open and requires manual reset 5. Broken supply wires or connector is not making contact 6. Unusually long compressor protector reset time due to extreme ambient temperature 7. Compressor windings are damaged Yellow “ALERT” Missing Phase1. Compressor fuse is open on one phase Flash Code 6 LOCKOUT 2. Broken wire or connector on one phase 3. Compressor motor winding is damaged 4. Utility supply has dropped one phase Yellow “ALERT” Flash Code 7 Reverse Phase LOCKOUT 1. Compressor running backward due to supply phase reversal Yellow “ALERT” Flash Code 8 Welded Contactor Compressor always runs 1. Compressor contactor has failed closed 2. Thermostat demand signal not connected to module Yellow “ALERT” Flash Code 9 Low VoltageControl circuit < 18VAC 1. Control circuit transformer is overloaded 2. Low line voltage to compressor 20 Table 7 — CADM Troubleshooting Miswired Module Indication Recommended Troubleshooting Action Green LED is not on, Determine if both R and C module terminals are module does not power up connected. Verify voltage in present at module’s R and Cterminals. NOTE: The CADM requires a constant nominal 24VAC power supply. The wiring to the module’s R and Cterminals must be directly from the control transformer. The module cannot receive its power from another device that will interrupt the 24VAC power supply. See Fig. 20, the 38AU Wiring Diagram. Green LED Intermittent, module powers up only when compressor runs Determine if R and Y terminals are wired in reverse. Verify module’s R and C terminals have a constant source. See “NOTE” above for details on R and C wiring. TRIP LED is on but systemVerify Y terminal is wired properly per the 38AU wiring and compressor check OK diagram (see Fig. 19). Verify voltage at contactor coil falls below 0.5VAC when off. Verify 24VAQC is present across Y and C when thermostat demand signal is present. If not, R and C are reverse wired. TRIP LED and ALERT LED flashing together Verify R and C terminals are supplied with 19-28VAC. ALERT Flash Code 3 (Compressor Short Cycling) displayed incorrectly Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off. ALERT Flash Code 5 or 6 (Open Circuit, Missing Phase) displayed incorrectly Check that compressor T1 and T3 wires are through module’s current sensing holes. Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off. Alert Flash Code * Determine if module’s Y terminal is connected. Verify Y (Welded Contactor)terminal is connected to 24VAC at contactor coil. Verify displayed incorrectly 24VAC is present across Y and C when thermostat demand signal is present. If not, R and C are reverse wired. Verify voltage at contactor coil falls below 0.5VAC when off. Crankcase Heater — The heater prevents refrigerantmigration and compressor oil dilution during shutdown whenever compressor is not operating. The heater is wired to cyclewith the compressor; the heater is off when compressor is running, and on when compressor is off. The crankcase heater will operate as long as the power circuitis energized. Compressor Protection COMPRESSOR OVERTEMPERATURE PROTECTION (IP) — A thermostat installed on the compressor motor winding reacts to excessively high winding temperatures and shutsoff the compressor. CRANKCASE HEATER — The heater minimizes absorption of liquid refrigerant by oil in the crankcase during brief orextended shutdown periods. The main disconnect must be onto energize the crankcase heater. IMPORTANT: Never open any switch or disconnect thatenergizes the crankcase heater unless unit is being servicedor is to be sh...