Contactor Shorted Detection
If there is compressor voltage sensed when there is no demand for compressor operation, the contactor may be stuck closed or there may be a wiring error. The control will flash the appropriate fault code.
If the control senses the compressor voltage after
If the thermal cutout trips for three consecutive cycles, then unit operation is locked out for 4 hours and the appropriate fault code is displayed.
No 230V at Compressor Contactor
If the compressor voltage is not sensed when the compressor should be starting, the appropriate contactor may be stuck open or there is a wiring error. The control will flash the appropriate fault code. Check the contactor and control box wiring.
Troubleshooting units for proper switching between low & high stages
Check the suction pressures at the service valves. Suction pressure should be reduced by
Compressor current should increase
When the compressor is operating in low stage the 24v DC compressor solenoid coil is
NOT INSTALL A PLUG WITHOUT AN INTERNAL RECTIFIER.
Unloader Test Procedure
The unloader is the compressor internal mechanism, controlled by the DC solenoid, that modulates between high and low stage. If it is suspected that the unloader is not working, the following methods may be used to verify operation.
1.Operate the system and measure compressor amperage. Cycle the unloader on and off at 30 second plus intervals at the User Interface (from low to high stage and back to low stage). Wait 5 seconds after staging to high before taking a reading. The compressor amperage should go up or down at least 20 percent.
2.If the expected result is not achieved, remove the solenoid plug from the compressor and with the unit running and the User Interface or thermostat calling for high stage, test the voltage output at the plug with a DC voltmeter. The read- ing should be 24 volts DC.
3.If the correct DC voltage is at the control circuit molded plug, measure the compressor unloader coil resistance. The resistance should be 32 to 60 ohms depending on com- pressor temperature. If the coil resistance is infinite, much lower than 32 ohms, or is grounded, the compressor must be replaced.
Temperature Thermistors
Thermistors are electronic devices which sense temperature. As the temperature increases, the resistance decreases. Thermistors are used to sense outdoor air (OAT) and coil temperature (OCT). Refer to Fig. 7 for resistance values versus temperature.
THERMISTOR CURVE
| 90 | |
(KOHMS) | 80 | |
70 | ||
| ||
| 60 | |
RESISTANCE | 50 | |
20 | ||
| 40 | |
| 30 | |
| 10 | |
| 0 |
0 | 20 | 40 | 60 | 80 | 100 | 120 |
(4.44) | (15.56) | (26.67) | (37.78) | (48.89) | ||
|
| TEMPERATURE °F (°C) |
|
|
A08054
Fig. 7 - Resistance Values Versus Temperature
If the outdoor air or coil thermistor should fail, the control will flash the appropriate fault code. (See Table 5.)
IMPORTANT: The outdoor air thermistor and coil thermistor should be factory mounted in the final locations. Check to ensure thermistors are mounted properly per Fig. 8 and Fig. 9.
Thermistor Sensor Comparison
The control continuously monitors and compares the outdoor air temperature sensor and outdoor coil temperature sensor to ensure proper operating conditions. The comparison is:
SIn cooling if the outdoor air sensor indicates ≥ 10_F
(≥ 5.6_C) warmer than the coil sensor (or) the outdoor air sensor indicates ≥ 20_F (≥ 11_C) cooler than the coil sensor, the
sensors are out of range.
SIn heating if the outdoor air sensor indicates ≥ 35_F (≥ 19.4_C) warmer than the coil sensor (or) the outdoor air sensor indicates ≥ 10_F (≥ 5.6_C) cooler than the coil sensor, the sensors are out of range.
If the sensors are out of range, the control will flash the appropriate fault code as shown in Table 5.
The thermistor comparison is not performed during low ambient cooling or defrost operation.
Failed Thermistor Default Operation
Factory defaults have been provided in the event of failure of outdoor air thermistor (OAT) and/or outdoor coil thermistor (OCT).
If the OAT sensor should fail, low ambient cooling will not be allowed and the
If the OCT sensor should fail, low ambient cooling will not be allowed. Defrost will occur at each time interval during heating operation, but will terminate after 5 minutes.
If there is a thermistor out of range error, defrost will occur at each time interval during heating operation, but will terminate after 5 minutes.
Count the number of short and long flashes to determine the appropriate flash code. Table 5 gives possible causes and actions related to each error.
286B / 289B
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