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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:
. 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.
. 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.
