System Control - Friedrich WallMaster WS07A10D Service Manual

3. "Hi Cool" Contacts closed between terminals "L1" to "1"
and "L1" and "C".
4. "Lo-Cool" Contacts are closed between terminals "L1" to
"2" and "L1 to "C".
SYSTEM CONTROL SWITCH
Figure 14
1. Disconnect leads from control switch.
2. Check continuity between all switch positions shown in
Figure 14.
SYSTEM CONTROL SWITCH
("WS" Models) (See Figure 15)
A five position control switch is used to regulate the operation
of the fan motor and compressor. The compressor can be
operated with the fan operating at low, medium or high speed.
The fan motor can also be operated independently on medium
speed. See switch section as indicated on decorative control
panel
SYSTEM CONTROL SWITCH - TEST
Disconnect leads from control switch (See Figure 16.)
There must be continuity as follows:
1. "Off" Position - no continuity between terminals.
2. "Lo Cool" Position - between terminals "L1" and "C", "LO"
and "MS."
3. "Med Cool" Position - between terminals "L1" and "C",
"M" and "MS".
4. "Hi Cool" Position - between terminals "L1" and C", "H"
and "MS."
5. "Fan Only" Position - between terminals "L1" and "2."
28
(SC Model Only)
System Control Panel
Figure 15
Figure 16
SYSTEM CONTROL SWITCH
("WE" & "WY" Models) (See Figure 17)
An eight position switch is used to regulate the operation of
the fan motor, compressor and electric heater. The unit can
be operated in cooling or heating mode with the compressor
or electric heater on and the fan motor operating on low,
medium or high speed.
The fan motor can also be operated independently on medium
speed. See switch section as indicated on decorative control
panel.
Figure 17
WS Models

System Control

Switch
WS Models
System Control Panel
WE & WY Models