Therma-Stor Products Group Santa-Fe Rx Free-Standing Dehumidification - Manual (Page 5)

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 gas to repeat
the process.
5.3 Troubleshooting
No dehumidification. Neither blower nor compressor run with
AUTO FAN and humidity control turned ON.
1. Unit unplugged or no power to outlet.
2. Humidity control set too high or defective (Sec. 3.1 & 5.7).
3. Loose connection in internal wiring (Fig. 2).
4. Safety float switch in remote reservoir has turned unit off
(Sec. 2.5).
No dehumidification. Compressor does not run but blower
runs with AUTO FAN and humidity control turned to ON.
1. Defective compressor run capacitor (Sec. 5.6).
2. Loose connection in compressor circuit (see Fig. 2).
3. Defective compressor overload (Sec. 5.6A).
4. Defective compressor (Sec. 5.6).
5. Defrost thermostat open (Sec. 5.8).
6. Defective relay (Sec. 5.10).
7. Pump Safety switch open (Sec. 5.9)
Blower runs with AUTO FAN, but compressor cycles on & off.
1. Low ambient temperature and/or humidity causing unit to cycle
through defrost mode.
2. Defective compressor overload (Sec. 5.6A).
3. Defective compressor (Sec. 5.6).
4. Defrost thermostat defective (Sec. 5.8).
Blower does not run with fan switch in either position.
Compressor runs briefly but cycles on & off.
1. Loose connection in blower circuit (see Fig. 2).
2. Obstruction prevents impeller rotation.
3. Defective blower (Sec. 5.5).
4. Blower switch defective.
Evaporator coil frosted continuously, low dehumidifying
capacity.
1. Defrost thermostat loose or defective (Sec. 5.8).
2. Low refrigerant charge.
3. Dirty air filter or air flow restricted (Sec. 4.1B).
5.4 Refrigerant Charging
If the refrigerant charge is lost due to service or a leak, a new
charge must be accurately weighed in. If any of the old charge
is left in the system, it must be removed before weighing in the
new charge. Follow EPA recovery regulations. Refer to the unit
nameplate for the correct charge weight and refrigerant type.
5.5 Blower Replacement
The centrifugal blower has a PSC motor and internal thermal
overload protection. If defective, the complete assembly must be
replaced.
1. Unplug the power cord.
2. Remove the unit top.
3. If optional HEPA, 95% efficient or carbon filters are attached to
the unit back, the filter(s) and their frame must be removed.
4. Remove the back cover (4 screws).
5. Remove the cabinet (6 screws).
6. Disconnect the blower leads: black from the black wire at wire
nut, and white from the run capacitor.
7. Remove the foam pieces at the blower outlet at the bottom
back to access the blower screws.
8. Remove the 4 screws holding the blower outlet flange and
remove the blower.
9. Reassembling with the new blower is the above procedure
reversed.
5.6 Compressor/Capacitor Replacement
CAUTION!
ELECTRIC SHOCk HAzARD:
Electrical power must be present to perform some tests; these
test should be performed by a qualified service person.
This compressor run capacitor is accessed by following steps 1
through 4 in section 5.5 on blower replacement; the compressor
is accessed by following steps 1 through 5. This compressor is
equipped with a two terminal external overload, run capacitor, but
no start capacitor or relay (see Fig. 2).
Perform the following tests if the blower runs but the compressor
does not with the
AUTO FAN and the humidity control ON.
1. Unplug the unit, follow steps 1 through 5 of section 5.5 to
access the compressor. Remove the electrical connection cover
on the compressor top.
FOR HVAC INSTALLER ONLY
5 Santa Fe Rx Installer’s & Owner’s Manual