Compressor Solenoid; Compressor Solenoid Test Procedure; Fan Blade Setting Dimensions; Table 9 Fan Blade Dimensions - Bard WA Series User Manual

Compressor Solenoid

See Sequence of Operation on page 26 for function.
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 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 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 2100-720C
Page 30 of 42

Fan Blade Setting Dimensions

Shown in Figure 25 is the correct fan blade setting
for proper air delivery across the outdoor coil. Refer to
Table 9 for unit specific dimension.
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.
FIGURE 25
Fan Blade Setting
AIRFLOW
MIS-1724
TABLE 9
Fan Blade Dimensions
Model
W3SAC
W4SAC
W5SAC
"A"
Dimension
A
1.5"