Maytag Amana GM9S92 Manual page 36

SERVICING
The following drawing illustrates the style of limit switches
used on the 90% furnaces.
FRONT VIEW
Primary Limit Control Style
(90% Furnaces)
HIGH VOLTAGE
Disconnect ALL power before servicing or
changing any electrical wiring. Multiple pow-
er sources may be present. Failure to do so
may cause property damage, personal injury
or death.
1. Remove burner compartment door to gain access to
the primary limit.
2. Remove low voltage wires at limit control terminals.
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.
Testing Primary Limit Control
36
ENCLOSED DISK
SIDE VIEW
WARNING

RED
RESET
BUTTON
COLOR
IDENTIFYING

Testing Primary Limit Control
(90% Furnaces)
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.
To aid in identifying these controls, refer to the Primary Limit
Charts in furnace Technical Manual for part number, tem-
perature setting and color(s) code.
Manual Reset Auxiliary Limit
Located in Blower Deck
The 90% single-stage upflow furnaces use two auxiliary
limit switch for control of high temperatures within the fur-
nace or duct work. This control is preset, nonadjustable and
auto reset. The control is located in the blower compartment
of the furnace on the blower deck, as shown in the following
illustration.
HIGH VOLTAGE
Disconnect ALL power before servicing or
changing any electrical wiring. Multiple pow-
er sources may be present. Failure to do so
may cause property damage, personal injury
or death.
To avoid possible fire, only reset the auxiliary limit control
once. If it should open a second time, a qualified servicer
must determine why the auxiliary limit opened before reset-
ting again.
To aid in identifying these controls, color coded labels are
attached to the back of the controls. Refer to the Auxiliary
Limit Charts in furnace Technical Manual for color codes and
temperature settings.
COLOR
IDENTIFYING
TAB
WARNING
WARNING