Friedrich 2008, 2009 service manual System Control Switch - Test, System Control Panel

FOR UNITS WITH ROTARY CONTROLS SYSTEM CONTROL SWITCH

(“WE” & “WY” Models) 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, in Figure 7.

Figure 7: System Control Panel

Fan	Off
Only
Low	Low
Heat	Cool
Med	Med
Heat	Cool

High	High
Heat	Cool	MAX	MAX
! Allow 3 min. between restarts		HEAT	COOL

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.

SYSTEM CONTROL SWITCH - TEST

Disconnect leads from control switch. Turn control to position being tested (see Figure 8). There must be continuity as follows:

1.“Off” Position-no continuity between terminals.

2.“Lo Cool” Position-between terminals “C” and “3”, “C2” and “2”, “LO” and “M/S”, “AR” and “5”.

3.“Med Cool” Position-between terminals “C” and “3”, “C2” and “2”, “M” and “M/S”, “AR” and “5”.

4.“Hi Cool” Position-between terminals “C” and “3”, “C2” and “2”, “H” and “M/S”, “AR” and “5”.

5.“Hi Heat” Position-between terminals “C” and “1”, “C2” and “4”, “H” and “M/S”, “AR” and “5”.

6.“Med Heat” Position-between terminals “C” and “1”, “C2” and “4”, “M” and “M/S”, “AR” and “5”.

7.“Lo Cool” Position-between terminals “C” and “1”, “C2” and “4”, “LO” and “M/S”, “AR” and “5”.

8.“Fan Only” Position-between terminals “L1”, “M” and “2”.

Figure 8: System Control Switch

(Heat Pump & Electric Heat Models)

NOTE:

Units will operate in constant fan in the cooling mode and auto fan in the heating mode.

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