Checking Flame Rollout Control - Maytag Amana GMES9 Series Service Instructions Manual

SERVICING
HIGH VOLTAGE
D ALL
ISCONNECT POWER BEFORE SERVICING OR
CHANGING ANY ELECTRICAL WIRING.
F
SOURCES MAY BE PRESENT. AILURE 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.
VOLT / OHM
Testing Primary Limit Control
VOLT / OHM
METER
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-
48
WARNING
M
ULTIPLE POWER
METER
COLOR
IDENTIFYING
TAB
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 furnace 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
D ALL
ISCONNECT POWER BEFORE SERVICING OR
M
INSTALLING THIS UNIT. ULTIPLE POWER SOURCES MAY
F
BE PRESENT. AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
T
O AVOID POSSIBLE FIRE, ONLY RESET THE AUXILIARY LIMIT CONTROL
I
ONCE. F IT SHOULD OPEN A SECOND TIME, A QUALIFIED SERVICER
MUST DETERMINE WHY THE AUXILIARY LIMIT OPENED BEFORE
RESETTING 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.
S-302 CHECKING FLAME ROLLOUT CONTROL
A temperature activated manual reset control is mounted to
the manifold assembly on 90% furnaces, as shown in the
following illustrations.
Should read continuous unless heat exchanger temperature
is above limit control setting. If not as above, replace the
control.
ROLLOUT
SWITCHES
* *
*
2
*
*
Flame Rollout Switch Location
The control is designed to open should a flame roll out oc
control opens, the air circulation blower will run continuously.
On single-stage models, the ignition control diagnostic light
will flash (6) six times indicating a trip of the rollout switch or
an open control board fuse.
WARNING
WARNING
FLAME
*
*