FOR HVAC INSTALLER ONLY
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
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.
2.Plug in the unit and turn the humidity control to ON. If the compressor tries to start but cycles on the over load, go to step 4. If the compressor remains silent, check for 110 volts from compressor terminal R to overload terminal 3 using an AC voltmeter. If voltage is resent, go to step 3. If there is no voltage, either the pump safety switch, defrost thermostat, low pressure control, or relay are open or there is a loose connection in the continuity; see the appropriate section if a defect is suspected.
3.Check continuity between overload terminals 1 and 3: if there is none, the overload may be tripped. Wait 10 minutes and try again. If there is still no continuity, it is defective and must be replaced.
4.Unplug the unit, then replace the run capacitor with one of the same microfarad rating and equal or greater voltage rating. If such a capacitor is unavailable, a hard start kit sized for this compressor may be used. If the compressor does not start and run correctly, the compressor is defective and must be replaced.
5 | Santa Fe Rx Installer’s & Owner’s Manual |
