Figure 4: Refrigeration system
4.1 Technical Description
The Phoenix 200 HT uses a refrigeration system similar to an air conditioner’s to remove heat and moisture from incoming air and to add heat to the air that is discharged.
Hot, high pressure refrigerant gas is routed from the compressor to the condenser coil. The refrigerant is cooled and condensed by giving up its heat to the air that is about to be discharged from the unit. The refrigerant liquid then passes through a filter/drier and capillary tubing which cause the refrigerant pressure and temperature to drop. It next enters the evaporator coil where it absorbs heat from the incoming air and evaporates.
The evaporator operates in a flooded condition, which means that all the evaporator tubes contain liquid refrigerant during normal operation. A flooded evaporator should maintain constant pressure and temperature across the entire coil, from inlet to outlet.
The mixture of gas and liquid refrigerant enter the accumulator after leaving the evaporator coil. The accumulator prevents any liquid refrigerant from reaching the compressor. The compressor evacuates the cool refrigerant gas from the accumulator and compresses it to a high pressure and temperature to repeat the process.
Some dehumidification, blower runs continuously but compressor only runs sporadically.
1.Unit is in defrost cycle.
2.Defrost thermostat defective or loose.
3.Loose connection in compressor circuit.
4.Defective compressor overload.
5.Defective compressor.
6.Defective relay.
No dehumidification, blower runs but compressor does not.
1.Bad connection in compressor circuit.
2.Pump safety switch closed.
3.Defective compressor capacitor.
4.Defective compressor overload.
5.Defective compressor.
6.Defective relay.
Blower does not run. Compressor runs briefly but cycles on and off.
1.Loose connection in blower circuit.
2.Obstruction prevents impeller rotation.
3.Defective blower.
Unit removes some water but not as much as expected.
1.Air temperature and/or humidity have dropped.
2.Humidity meter and/or thermometer used are out of calibration.
3.Unit has entered defrost cycle.
4.Air filter dirty.
5.Defrost timer incorrectly set for conditions.
6.Defective defrost thermostat.
7.Low refrigerant charge.
8.Air leak such as loose cover.
9.Defective compressor.
10.Restrictive exhaust ducting.
Unit runs but does not pump water.
4.2 Troubleshooting | 1. | Hose kinked or plugged. | ||
No dehumidification, neither blower nor compressor run | 2. | Pump motor or float switch defective. | ||
3. | Pump check valve plugged. | |||
and power switch does not light when ON. | ||||
1. | Unit unplugged or no power to outlet. | 4. | Bad connection in pump circuit. | |
2. | Power switch defective. | 5. | Hose disconnected internally. | |
3. | Loose connection in internal wiring. |
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| Unit pumps water automatically but not when purge switch | ||
No dehumidification, neither blower nor compressor run | is pushed. | |||
1. | Bad connection in purge switch circuit. | |||
with power switch ON and lit. | ||||
2. | Defective purge switch. | |||
1. | Low pressure control open. | |||
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2.Power switch defective.
3.Loose connection in internal wiring.
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