420706-U
U M-A-1 008
SECTION IV: FURNACE MAINTENANCE·
USER INFORMATION
Before proceeding,
be sure the area is well ventilated.
Turn
the thermostat
OFF. If the blower
is running,
wait until it
stops automatically.
Turn OFF the gas and electrical power
supplies
to
the furnace. Check all metal parts and surfaces
to
be sure they have cooled
to
room temperature
before
you begin.
EXTERNAL AIR FILTERS
Filters used with this furnace must be installed
external
to the furnace
casing. DO NOT attempt to install filters inside the furnace cabinet.
Some installations
may have the air filter in a rack attached to the cas-
ing of the furnace or placed in the return air duct. If the filter location or
replacement
process
is not obvious,
contact
your installer
or service
technician for assistance.
Every time the external air filters are changed the following
items should
be visually inspected:
•
Check combustion
air and vent pipe for blockage or leakage.
Check all components
to be sure they are in good condition
and
that there are no obvious signs of deterioration.
Check the drain lines to make sure there are no cracks or leaks.
•
Check for dirt or lint on any surfaces or on components.
Do not try
to clean any of the surfaces or components.
Cleaning
of the fur-
nace and its components
must be done by a qualified service pro-
fessional.
If during the inspection
of your furnace,
you find any of the following
conditions:
Excessive amounts of dust and lint on components.
•
Damaged or deteriorated
components
or surfaces.
Leaks or blockage in the vent pipe passages.
Water on any surface inside or outside of the furnace.
Do not operate the furnace, call a certified dealer or servicing contractor
to check or clean your furnace,
or for more information
if you have
questions about the operation of your furnace.
If all components
appear to be in good operating
condition,
replace the
furnace
access
panels/doors.
Tum ON the gas and electrical
power
supplies to the furnace, and set thermostat
to the desired temperature.
How to Clean your Filter
High-velocity
filters may be cleaned with a vacuum
cleaner or washed
with a garden hose. Be sure to shake off excess water and allow filter to
completely dry before re-installing
the filter.
Replace
throwaway
filter(s)
with the same
size new filter(s).
Throw
away filter(s) may be replaced with cleanable
filter(s) at this time.
Removing Filters For Manufactured
(Mobile) Home And
Modular Home Installations
Using A Return Air Duct Sys-
tem And Plenum
Modular
Home downflow
furnaces
requiring
a return duct system
by
Local, State, or Regional Codes will have the filters located on the top of
the furnace in an external filter rack located inside the return air plenum
as shown in Figure 5. To check,
clean or replace
the air filters
you
should:
1.
Follow the instructions
to turn off the appliance
before servicing.
2.
Filters that are installed in the return air plenum above the blower
assembly and are located in an "V" frame assembly
that supports
the filters as shown in Figure 5.
3.
To remove the filters you must remove the screws that are secur-
ing the access
panels on the return air plenum
and remove
the
access panels.
4.
Lift the filters lightly and remove them.
5.
If the filters are the throwaway
type you must replace the filters
with filters that are the same size as the filters you removed.
If you
want to replace the throwaway
air filters with permanent
washable
filters you can do so at this time.
6.
If the filters are washable,
follow the instructions
"HOW TO CLEAN
YOUR FURNACE'S
FILTER".
7.
To reinstall the air filters reverse steps 1 - 6 above.
8.
To place the furnace back in operation
follow the operating
instruc-
tions to place appliance
in operation.
Removing Filters For Manufactured
(Mobile) Home And
Modular Home Installations
Without A Return Air Duct Sys-
tem And Plenum
Manufactured
(Mobile)
Home
downflow
furnaces
and modular
home
furnaces
not requiring a return duct system by Local, State, or Regional
codes will have the filters located on the top of the furnace in an exter-
nal filter rack. To check, clean or replace the air filters you should:
1.
Follow the instructions
to turn off the appliance
before servicing
2.
Filters that are installed on the top of the furnace above the blower
assembly
and are located in an "A" frame assembly
that supports
the filters as shown in Figure 5.
3.
To remove the filters just slide them out of the assembly. You may
have to bend the filters to slide them around the combustion
air
and the vent pipes.
4.
If the filters are the throwaway
type you must replace the filters
with filters that are the same size as the filters you removed.
If you
want to replace the throwaway
air filters with permanent
washable
filters you can do so at this time.
5.
If the filters are washable,
follow the instructions
"HOW TO CLEAN
YOUR FILTER".
6.
To reinstall the air filters reverse steps 1 - 4 above.
7.
To place the furnace back in operation follow the operating
instruc-
tions to place appliance
in operation.
FIGURE 5: Mobile Home Filter Frame
BLOWER CARE
Even with good filters property in place, blower wheels and motors will
become dust laden after months of operation.
The entire blower assem-
bly should be inspected
annually. This service must be performed
by a
qualified service agency.
NOTE: The spring-loaded
safety cut-off switch, mounted
at the blower
deck will automatically
cut off the electrical
power supply to the furnace
when the furnace
blower
access
panel/door
is removed.
As a safety
precaution,
all electrical power and the gas supply to the furnace should
be turned off before servicing.
4
Johnson Controls Unitary Products
