- Therna-Stor Production Santa-Fe Rx Free-Standing Dehumidification Installer's & Owner's Manual

5.6A Replacing a Burned out Compressor
The refrigerant and oil mixture in a compressor is chemically very
stable under normal operating conditions. However, when an
electrical short occurs in the compressor motor, the resulting high
temperature arc causes a portion of the refrigerant oil mixture to
break down into carbonaceous sludge, a very corrosive acid and
water. These contaminants must be carefully removed otherwise
even small residues will attack replacement compressor motors
and cause failures.
Test the failed compressor oil with a test kit. If it indicates a burn-
out, follow EPA regulations for disposing of the old refrigerant
and oil. Follow standard procedures for replacing a burned-out
compressor. These would include replacement of the liquid line
filter/drier and addition of an oversized suction line filter/drier if it
was a running burn-out. Several changes of the liquid and suction
filter/driers may be necessary to cleanse the system.
5.6B Replacing a Compressor-Nonburn Out
Dispose of the old refrigerant per EPA guidelines. Replace the
compressor and liquid line filter/drier. Weigh in the refrigerant
quantity listed on the nameplate.
5.7 Humidity Control
The humidity control is an adjustable switch that closes when the
relative humidity of the air in which it is located rises to the dial
set point. It opens when the RH drops 4 to 6% below the set point.
5.8 Defrost Thermostat
The defrost thermostat is attached to the refrigerant suction tube
between the accumulator and compressor. It will automatically
shut the compressor off if the low side refrigerant temperature
drops due to excessive frost formation on the evaporator coil.
The blower will continue to run, causing air to flow through the
evaporator coil and melt the ice. When the ice has melted, the
evaporator temperature will rise and the thermostat will restart the
compressor.
5.9 Condensate Pump
Condensate is automatically pumped to a remote location when
the water level in the pump’s reservoir rises to close the float
switch.
The pump also contains a safety float switch. If the pump fails,
this switch opens the compressor control circuit and stops water
production before the reservoir overflows. The compressor will
stop, but the blower will not.
5.10 Relay
The relay provides power to the compressor via the black wire.
Current passes through relay contacts between terminals 4 and 6.
The contacts are closed when power is applied to relay terminals
0 and 1 by the dehumidistat, pump safety, defrost control and low
pressure control are all closed.
If there is no continuity between terminals 4 and 6 when power
is applied to terminal 0 and 1 by the control circuit, the relay is
defective and must be replaced. The relay is also defective if there
is continuity between 4 and 6 when no power is applied to 0 and 1.
5.11 Low Pressure Control
If the low side refrigerant pressure drops to 15 PSIG, the low
pressure control opens; this opens the blower circuit and the control
circuit that controls the compressor. It is an automatically reset
control; it will close if the pressure rises to 37 PSIG. It’s primary
function is to prevent damage to the compressor if a leak develops
in the refrigeration system.
FOR HVAC INSTALLER ONLY
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Santa Fe Rx Installer’s & Owner’s Manual