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2. Turn off all electrical power to
the furnace. (See Fig. 9.)
3. Close oil supply valve.
(See Fig. 10).
4. If applicable, turn off water sup-
ply to humidifier.
5. If furnace blower will be neces-
sary for cooling system, remem-
ber to turn electric power back
on when needed for air condi-
tioning.
6. If furnace is being shut down be-
cause of a malfunction, call your
dealer as soon as possible.
ALWAYS
KEEP
MAIN
VALVE
TURNED
BURNER IS SHUT DOWN FOR
AN EXTENDED PERIOD OF
TIME.
PERFORMING
ROUTINE
MAINTENANCE
With proper maintenance and care,
your furnace will operate economi-
cally and dependably. Instructions
for basic maintenance follow. How-
ever, before beginning maintenance,
follow these safety precautions:
!
ELECTRICAL SHOCK
HAZARD
Failure to follow this warning
could result in personal inju-
ry or death.
Turn off all electrical power to
furnace before performing
any maintenance or service
on unit.
9
!
10
CUT HAZARD
Failure to follow this caution
may result in personal injury.
Although special care has
been taken to minimize sharp
edges, be extremely careful
when
handling
reaching into the furnace.
FILTERING OUT
TROUBLE
Dirty air filters will cause a loss of
OIL
airflow in your duct system. When
OFF
IF
excessive loss of airflow occurs,
the furnace may cycle on its safety
controls. If this condition is left
unattended, the furnace will even-
tually lock out. It is recommended
that furnace air filters be checked
every 3 or 4 weeks and cleaned or
replaced as necessary.
WARNING
11
CAUTION
parts
or
6
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution
may result in reduced unit
component life.
Never operate your furnace
without the air filters in place.
Doing so may damage the
furnace blower motor. An ac-
cumulation of dust and lint
on internal parts of your
furnace can cause a loss of
efficiency.
The air filter is installed in an ex-
ternal filter rack which is provided as
standard equipment with furnace.
To inspect, clean, and/or replace
air filter, follow these steps:
1. Turn off electrical supply to fur-
nace. (See Fig. 11.)
2. Remove filter from external fil-
ter rack.
3. Inspect filter. If torn, replace it.
NOTE: If filter has been replaced
with an electronic air cleaner
(EAC), refer to the EAC Owner's
Manual for maintenance informa-
tion.
4. If filter is dirty, it must be re-
placed. If your furnace air filter
needs to be replaced, be sure to
use the same size and type of fil-
ter that was originally supplied.
Use furnace filter table for filter
size and filter rack flange dimen-
sions for return air duct.
FURNACE AIR FILTER TABLE
FLANGE
OPENING
FILTER
SIZE
SIZE
(IN.)
(IN.)
Model Size 105
16 X 24 X 1
15 X 23
or
16 X 25 X 1
Model Size 120
18 X 30 X 1
19 X 29
or
20 X 30 X 1
If you have replaced a disposable
filter with a permanent washable
filter, it may be cleaned if it is dirty.
FILTER
TYPE
Disposable
Disposable
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