Therma-Stor Products Group Phoenix 200 HT - Manual (Page 6)

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Evaporator coil frosted continuously, low dehumidifying
capacity.
. Defrost thermostat loose or defective.
2. Defrost timer incorrectly set or defective.
3. Low refrigerant charge.
4. Dirty air filter or air flow restricted.
Compressor runs with power switch OFF.
. Defective relay.
2. Defective power switch.
4.3 Blower Replacement
The motorized impeller has a PSC motor and internal
thermal overload protection. If defective, the complete
assembly must be replaced.
. Unplug the power cord.
2. Remove the top panel and cabinet front (6 screws).
3. Disconnect the impeller leads.
4. Remove four screws holding the impeller to the
impeller brackets.
5. Remove four screws holding the impeller brackets to
the condenser shroud.
6. Remove impeller and impeller brackets. Use care to
avoid hooking wiring, tubing or electrical components.
7. Reassemble with the new impeller in the above
procedure reversed.
4.4 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 refer to
Section 3 for defrost timer adjustment.
4.5 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:
. 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.
4.6 Gravity Drain Option
If the condensate pump fails and cannot be replaced
immediately, the Phoenix 200 HT can be used by draining
by gravity.
. Unplug the unit and remove the front cover.
2. Push the plastic plug on the left side 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
left 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.
Figure 5: Defrost thermostat Figure 6: Defrost timer
Figure 7: Condensate pump