6
Syst
em
O
pe
rat
ion
FIGURE 6
UPFLOW AND HORIZONTAL FILTER LOCATION – RECOMMEND
ST-A1194-10-XO
UPFLOW FILTER SIZES
FURNACE BOTTOM SIDE
WIDTH SIZE SIZE
QUANTITY
17
1
⁄
2
ⴖ
15
3
⁄
4
ⴖ
X 25
ⴖ
15
3
⁄
4
ⴖ
X 25
ⴖ
1
21
ⴖ
19
1
⁄
4
ⴖ
X 25
ⴖ
15
3
⁄
4
ⴖ
X 25
ⴖ
1
24
1
⁄
2
ⴖ
22
3
⁄
4
ⴖ
x 25
ⴖ
15
3
⁄
4
ⴖ
x 25
ⴖ
1
FIGURE 7
UPFLOW SIDE FILTER INSTALLATION – RECOMMEND
SIDE RETURN
ST-A1194-11-XO
FIGURE 8
DOWNFLOW/HORIZONTAL ALTERNATE FILTER IINSTALLATION –
RECOMMEND
ST-A1194-12-XO
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings
exactly could result in danger-
ous operation, serious injury,
death or property damage.
Improper servicing could result
in dangerous operation, serious
injury, death or property dam-
age.
• Before servicing, disconnect all
electrical power to furnace.
• When servicing controls, label
all wires prior to disconnecting.
Reconnect wires correctly.
• Verify proper operation after
servicing.
FIRE, EXPLOSION OR CARBON
MONOXIDE POISONING HAZ-
ARD
Failure to replace with proper
control could result in fire, ex-
plosion or carbon monoxide poi-
soning.
This appliance uses a NEGATIVE
PRESSURE REGULATED gas
control.
Replace ONLY with the same
model number or as specified by
the manufacturer.
!
WARNING
!
WARNING
