Checking Flame Rollout Control - Amana GMSS9 Series Service Instructions Manual

SERVICING
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-
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.
COLOR
IDENTIFYING
TAB
WARNING
WARNING
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 tempera-
ture is above limit control setting. If not as above, replace
the control.
FLAME
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 continu-
ously.
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.
To aid in iderntifying these controls, color-coded labels have
been affixed to the back of these controls. Refer to the
Rollout Limit Charts in furnace Technical Manual for tem-
perature settings and color codes.
WARNING
L
INE VOLTAGE NOW PRESENT
1. Remove the burner compartment door to gain access
to the rollout switch(es) mounted to burner bracket.
The servicer should reset the ignition control by opening
and closing the thermostat circuit. Then look for the ignitor
glowing which indicates there is power to the ignition con-
trol. Measure the voltage between each side of the rollout
control and ground while the ignition control tries to power
the gas valve.
2. Measure the voltage between each side of the rollout
control and ground during the ignition attempt. Refer to
the following figure.
49