GC9C96 Service Manual

SERVICING
26
3. With an ohmmeter, test between these two terminals
as shown in the following drawing. The ohmmeter
should read continuous unless heat exchanger tem-
perature is above limit control setting. If not as above,
replace the control.
COLOR
IDENTIFYING
TAB


4. After completing check and/or replacement of primary
limit control, reinstall burner compartment door.
5. Turn on electrical power and verify proper unit operation.


The auxiliary limit control is designed to prevent furnace
operation in case of main blower failure in horizontal
installations. It may also open if the power supply is interrupted
while the furnace is ring.
The auxiliary limit control is suitable for both horizontal
right and horizontal left installations. Regardless of airow
direction, it does not need to be relocated. The (2) two auxiliary
limits are located on the blower housing (one on each side),
as shown in the following illustration.
LIMIT
AUXILIARY LIMIT
CONTROL
AUXILIARY LIMIT
CONTROL
BLOWER HOUSING


G TG

T

R BR RG R
TG T T

T R R 
B RT

R T     RRT
G R JR R T
1. Remove blower compartment door to gain access to
the auxiliary.
2. Remove the wires from the auxiliary limit control termi-
nals.
3. Using an ohmmeter, test for continuity across the two
terminals.
RED
RESET
BUTTON
COLOR
IDENTIFYING


