31
Section C - Components, cont’d.
C9. Selector Switch
C9a. Selector Switch -
Roof Top Air
Conditioner
The selector switch in a mechanical air conditioner has
several positions. The various switch positions can be tested
for continuity with a volt/ohm meter set on the highest ohm
scale. See FIG. C12.
First turn the 20 amp air conditioner breaker to OFF and
remove wires from the switch.
With the switch in the OFF position, you should not have
continuity between terminal L1 and any other terminals.
In the HIGH FAN position, you should have continuity be-
tween L1 and terminal 1.
In the MEDIUM FAN position, you should have continuity
between L1 and terminal 2.
In the LOW FAN position, you should have continuity be-
tween L1 and terminal 4.
In the HIGH COOLING mode, you should have continuity
between L1 and C, and L1 and 1.
In the MEDIUM COOLING mode, you should have conti-
nuity between L1 and C, and L1 and 2.
In the LOW COOLING mode, you should have continuity
between L1 and C, and L1 and 4.
In the HEATING mode, you should have continuity between
L1 and H, and L1 and 4.
Be sure to check the switch in all positions and be sure you
have continuity only on the terminals for the selected mode.
Lack of continuity or continuity on incorrect terminals des-
ignates a defective switch, and it must be replaced.
Position
Terminals
OFF
HI FAN
L1 and 1
MED FAN
L1 and 2
LOW FAN
L1 and 4
HI COOL
L1 and C; L1 and 1
MED COOL
L1 and C; L1 and 2
LOW COOL L1 and C; L1 and 4
HEAT
L1 and H; L1 and 4
C9b. Selector Switch -
Roof Top Heat
Pump
The selector switch in a mechanical heat pump has sev-
eral positions. The various switch positions can be tested
for continuity with a volt/ohm meter set on the highest scale.
See FIG. C13.
Model 59126.501 First turn the 20 amp heat pump breaker
to OFF. Next, remove the wires from the switch. With the
switch in the OFF position, you should not have continuity
between Terminal L1 and any other white numbered termi-
nal.
In the HIGH 2 FAN position, you should have continu-
ity between Terminal L1 and Terminal 4 only.
In the HIGH 1 FAN position, you should have continu-
ity between Terminal L1 and Terminal 2 only.
In the LOW FAN position, you should have continuity
between Terminal L1 and Terminal 1 only.
In the LOW COOLING position, you should have con-
tinuity between Terminal L1 and Terminal C; and Ter-
minal L1 and Terminal 1 only.
In the HIGH 1 COOLING position, you should have
continuity between Terminal L1 and Terminal C; and
Terminal L1 and Terminal 2 only.
In the HIGH 2 COOLING position, you should have
continuity between Terminal L1 and Terminal C; and
Terminal L1 and Terminal 4 only.
In the HEAT PUMP position, you should have continu-
ity between Terminal L1 and Terminal H; and Terminal
L1 and Terminal 4 only.
Note:
The terminals are identified with white ink.
Be sure to check the switch in all positions and be sure you
have continuity only on the terminals for the selected posi-
tion. Lack of continuity or continuity on incorrect terminals
designates a defective switch, and it must be replaced.
Note:
The numbers without circles are the white ink-
stamped numbers.
Position
Terminals
OFF
HIGH 2 FAN
L1 and 4
HIGH 1 FAN
L1 and 2
LOW FAN
L1 and 1
LOW COOLING
L1 and C; L1 and 1
HIGH 1 COOLING L1 and C; L1 and 2
HIGH 2 COOLING L1 and C; L1 and 4
HEAT PUMP
L1 and H; L1 and 4
FIG. C12
FIG. C13
Manual
Compliments
of
Northwest
RV
Supply
Printed
From
http://www.nwrvsupply.com
