Manual 2100-526H
Page
17 of 24
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 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 7.
SERVICE
COMPRESSOR SOLENOID
(See Sequence of Operation on page 15 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.
FIGURE 8
FAN BLADE SETTING
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 re-install.
TABLE 7
FAN BLADE DIMENSIONS
"A"
AIRFLOW
MIS-1724
Model
Dimension A
WA/L3S*
WA/L4S*
WA/L5S*
1.75"
