6
12
13
14
SHUTTING DOWN
YOUR FURNACE
Should you need to shut down your
furnace for service or maintenance,
you will need to turn the furnace off.
The following procedures must be
followed:
1. Set your room thermostat to the
lowest temperature setting.
(See Fig. 15.)
15
16
2. Close the external manual gas
valve. (See Fig. 7.)
3. Turn off electrical supply to the
furnace. (See Fig. 16.)
4. Remove main furnace door.
(See Fig. 9.)
5. Turn control switch on the gas
control to OFF position.
(See Fig. 17.)
17
6. Replace main furnace door.
(See Fig. 12.)
7. If the furnace is being shut down
because of a malfunction, call
your dealer as soon as possible.
PERFORMING
ROUTINE
MAINTENANCE
NOTE:
The qualified installer or agency
must use only factory-authorized
replacement parts, kits, and accessories
when modifying this product.
Installing and servicing of heating
equipment can be hazardous due to
gas and electrical components.
Only trained and qualified personnel
should install, repair, or service heat-
ing equipment. Untrained personnel
can perform basic maintenance func-
tions such as cleaning and replacing air
filters.
All other operations must be performed
by trained and qualified service agency
personnel. Observe safety precautions
in this manual, on tags, and on labels
attached to the furnace and other safety
precautions that may apply.
With proper maintenance and care, your
furnace will operate economically and
dependably. Instructions for basic mainte-
nance are found on this and the following
pages. However, before beginning main-
tenance, follow these safety precautions:
FILTERING OUT TROUBLE
A dirty air filter will cause a loss of airflow
in your duct system. When excessive loss
of airflow occurs, the furnace may cycle
on its safety controls. If this condition is
left unattended, the furnace will eventu-
ally lock out. It is recommended that the
O
PE
N
®
CAUTION
Furnace is not to be installed,
operated, and then turned off
and left turned off in an unoc-
cupied structure during winter.
(See “Heading South for the
Winter” procedures in mainte-
nance section on page 8.)
Freeze damage to furnace
would occur.
!
WARNING
Turn off electrical power sup-
ply to your furnace before re-
moving the main furnace door
to service or perform mainte-
nance. Failure to follow this
warning could result in per-
sonal injury/death or property
damage.
CAUTION
Although special care has
been taken to minimize sharp
edges, be extremely careful
when handling parts or reach-
ing into the furnace. Failure to
follow this caution would re-
sult in minor personal injury.
CAUTION
Never operate your furnace
without the air filter in place.
Doing so may damage the fur-
nace blower motor. An accu-
mulation of dust and lint on
internal parts of your furnace
can cause a loss of efficiency
and would cause minor prop-
erty or product damage.
!
!
!
Summary of Contents for 345MAV
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