Table of Contents
Advertisement
SERVICE
COMPRESSOR SOLENOID
A nominal 24-volt direct current coil activates the
internal compressor solenoid. The input control
circuit voltage must be 18 to 28 VAC. 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 10-second intervals. The compressor
amperage should go up or down at least 25%.
2. If Step 1 does not give the expected results, shut
unit off. Apply 18 to 28 VAC 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, 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 VAC). 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 0 ohms, while the other should read
infinity. Repeat with other wire. The same female
connector as before should read 0, 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 0
ohms.
Replace plug if either of these test methods does not
show the desired results.
Manual 2100-646
Page
18 of 26
FAN BLADE SETTING DIMENSIONS
The correct fan blade setting dimensions for proper air
delivery across the outdoor coil are shown in Figure 8.
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 5).
FIGURE 8
Fan Blade Setting
AIRFLOW
MIS-1724
TABLE 5
Fan Blade Dimensions
Model
HA/L4S4
HA/L5S4
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 nine (9) screws holding fan shroud to
condenser and bottom.
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 re-install.
"A"
Dimension A
1.75"
Advertisement
Table of Contents
