Therma-Stor Products Group 200 MAX Defrost Thermostat and Timer, Condensate Pump, Relay

If sludge is evident in the discharge line, it will likely be found in the suction line; this indicates the compressor burned out while running. Sludge and acid have been pumped throughout the system. Several changes of the liquid and suction filter/driers will probably be necessary to cleanse the system.

5.Correct the system fault that caused the burn out. Consult the factory for advice.

6.Install the replacement compressor with a new capacitor and an oversized liquid line filter.

In a running burn out, install an oversized suction line filter/drier between the accumulator and compressor. Thoroughly flush the accumulator with refrigerant to remove all trapped sludge and to prevent the oil hole from becoming plugged. A standing burn out does not require a suction line filter/drier.

7.Evacuate the system with a good vacuum pump and accurate vacuum gauge. Leave the pump on the system for at least an hour.

8.Operate the system for a short period of time, monitoring the suction pressure to determine that the suction filter is not becoming plugged. Replace the suction filter/drier if pressure drop occurs. If a severe running burn out has occurred, several filter/driers may have to be replaced to remove all of the acid and moisture.

NOTE: NEVER use the compressor to evacuate the system or any part of it.

4.6C Replacing a Compressor- Non-Burn Out

Remove the refrigerant from the system. Replace the compressor and liquid line filter/drier. Charge the system to 50 PSIG and check for leaks. Remove the charge and weigh in the refrigerant quantity listed on the nameplate. Operate the system to verify performance.

4.7 Defrost Thermostat and Timer

The defrost thermostat is attached to the refrigerant suction tube between the accumulator and compressor. If the low side refrigerant temperature drops due to excessive frost formation on the evaporator coil, the thermostat opens. The compressor is then cycled off and on by the defrost timer. The blower will continue to run, causing air to flow through the evaporator coil and melt the ice when the compressor is off. When the air temperature and/or humidity increase, the evaporator temperature will rise and the thermostat will close to end the defrost cycle.

To improve performance in low temperatures, see Sec. 2.9 for defrost timer adjustment.

4.8 Condensate Pump

Condensate is automatically pumped when the water level in the pump’s reservoir rises to close the float switch or if the pump purge switch is held in.

To replace the condensate pump:

1.Remove the metal strap holding the pump by loosening the 2 screws holding it in place.

2.Disconnect the leads.

3.Installation is the reverse of above, but check that the plastic inlet and outlet hoses do not rub against copper refrigerant tubes.

4.9 Gravity Drain Option

If the condensate pump fails and cannot be replaced immediately, the Phoenix 200 MAX can be used by draining by gravity.

1.Unplug the unit and remove the front cover.

2.Push the plastic plug on the right side (see Fig. 4) out from inside the unit.

3.Locate the heavy vinyl hose that connects the drain pan to the condensate pump. Pull the end out of the pump.

4.Push that end of the vinyl hose through the hole in the right side.

5.Connect a garden hose and run it to a drain. Keep the hose as flat to the floor as possible to avoid air pockets that would hinder draining. Placing the unit on something above the floor will also improve draining.

4.10 Relay

The contacts of the single pole, single throw relay complete the power circuit to the compressor. The contacts are closed when power is provided to the relay coil via the control circuit. The control circuit includes the power switch, low pressure control, defrost thermostat and timer.

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