Manual 2100-587C
Page
42 of 59
COMPRESSOR SOLENOID
(See Sequence of Operation on Page 37 for function.)
A nominal 24-volt direct current coil activates the
internal compressor solenoid. The input control
circuit voltage must be 18 to 28 volt ac. The coil
power requirement is 20 VA. The external electrical
connection is made with a molded plug assembly. This
plug contains a full wave rectifier to supply direct
current to the unloader coil.
Compressor Solenoid Test Procedure
If it is suspected
that the unloader is not working, the following methods
may be used to verify operation.
1. Operate the system and measure compressor
amperage. Cycle the compressor solenoid on and off
at ten-second intervals. The compressor amperage
should go up or down at least 25 percent.
2. If step one does not give the expected results, shut
unit off. Apply 18 to 28 volt ac to the solenoid
molded plug leads and listen for a click as the
solenoid pulls in. Remove power and listen for
another click as the solenoid returns to its original
position.
3. If clicks can’t be heard, shut off power and remove
the control circuit molded plug from the compressor
and measure the solenoid coil resistance. The
resistance should be 32 to 60 ohms depending on
compressor temperature.
4. Next, check the molded plug.
Voltage check
: Apply control voltage to the plug wires
(18 to 28 volt ac). The measured
dc
voltage at the female
connectors in the plug should be around 15 to 27 vdc.
Resistance check
: Measure the resistance from the end
of one molded plug lead to either of the two female
connectors in the plug. One of the connectors should read
close to zero ohms, while the other should read infinity.
Repeat with other wire. The same female connector as
before should read zero, while the other connector again
reads infinity. Reverse polarity on the ohmmeter leads and
repeat. The female connector that read infinity previously
should now read close to zero ohms.
Replace plug if either of these test methods does not
show the desired results.
Troubleshooting
FAN BLADE SETTING DIMENSIONS
Shown in the drawing below are the correct fan blade
setting dimensions for proper air delivery across the
outdoor coil. See Figure below.
Any service work requiring removal or adjustment
in the fan and/or motor area will require that the
dimensions below be checked and blade adjusted in or
out on the motor shaft accordingly. See Table 11.
REMOVAL OF FAN SHROUD
1. Disconnect all power to unit.
2. Remove the screws holding both grills – one on
each side of unit – and remove grills.
3. Remove screws holding fan shroud to condenser and
bottom – (9) screws.
4. Unwire condenser fan motor.
5. Slide complete motor, fan blade, and shroud
assembly out the left side of the unit.
6. Service motor/fan as needed.
7. Reverse steps to reinstall.
FIGURE 18
FAN BLADE SETTING
"A"
AIRFLOW
MIS-1724
TABLE 11
FAN BLADE DIMENSIONS
Model
Dimension A
WG3S2
WG4S2
WG5S2
1.75
"
Summary of Contents for WG3S2-A
Page 11: ...Manual 2100 587C Page 11 of 59 FIGURE 2A MOUNTING INSTRUCTIONS FOR WG3S2...
Page 12: ...Manual 2100 587C Page 12 of 59 FIGURE 2B MOUNTING INSTRUCTIONS FOR WG4S2 AND WG5S2...
Page 15: ...Manual 2100 587C Page 15 of 59 FIGURE 6 COMMON WALL MOUNTING INSTALLATIONS...
Page 25: ...Manual 2100 587C Page 25 of 59 FIGURE 11 GAS PIPE CONNECTION...
