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5165698-UUM-C-0519
SECTION IV: FURNACE MAINTENANCE -
USER INFORMATION
WARNING
!
Before proceeding, be sure the area is well ventilated. Turn the ther-
mostat 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 tem-
perature 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, perform the following
visual checks:
• Check the combustion air and vent pipe for blockage or leakage.
• Check all components to make sure they are in good condition
and 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.
Do not operate the furnace if you find any of the following conditions
when inspecting the furnace:
• 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
Call a certified dealer or servicing contractor to check or clean your fur-
nace 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. Turn on the gas and electrical power sup-
plies to the furnace, and set the thermostat to the required temperature.
How to Clean your Filter
High-velocity filters may be cleaned with a vacuum cleaner or washed
with a garden hose. Ensure to shake off excess water and allow the fil-
ter to completely dry before re-installing the filter.
Replace throwaway filters with new filters of the same size. Throwaway
filters can be replaced with cleanable filters at this time.
Removing Filters for Manufactured (Mobile) Home and
Modular Home Installations Using a Return Air Duct Sys-
tem and Plenum
In manufactured (mobile) home downflow furnaces and modular home
downflow furnaces where a return duct system is required by local,
state, or regional codes, the filters are located on the top of the furnace
in an external filter rack inside the return air plenum. See Figure 5.
4
To check, clean, or replace the air filters, do the following:
1. Follow the instructions to turn off the appliance before servicing.
2. Filters are installed in the return air plenum above the blower
assembly and are located in a V frame assembly that supports the
filters. See Figure 5.
3. Remove the screws that are securing 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 throwaway filters, you must replace the filters with fil-
ters 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 in the How to Clean
your Filter section.
7. To reinstall the filters, insert the filters in the return air plenum,
replace the access panels on the return air plenum, and secure the
access panels with the screws.
8. To place the furnace back in operation, follow the operating instruc-
tions. See the OPERATING INSTRUCTIONS section.
Removing Filters for Manufactured (Mobile) Home and
Modular Home Installations Without a Return Air Duct Sys-
tem and Plenum
In manufactured (mobile) home downflow furnaces and modular home
downflow furnaces where a return duct system is not required by local,
state, or regional codes, the filters are located on the top of the furnace
in an external filter rack.
To check, clean, or replace the air filters, do the following:
1. Follow the instructions to turn off the appliance before servicing
2. Filters are installed on the top of the furnace above the blower
assembly and are located in an A frame assembly that supports the
filters. See Figure 5.
3. To remove the filters, slide them out of the assembly. You may have
to bend the filters to slide them around the combustion air and vent
pipes.
4. If the filters are throwaway filters, you must replace the filters with fil-
ters 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 in the How to Clean
your Filter section.
6. To reinstall the filters, slide them back into the assembly.
7. To place the furnace back in operation, follow the operating instruc-
tions. See the OPERATING INSTRUCTIONS section.
FIGURE 5: Mobile Home Filter Frame
Johnson Controls Ducted Systems
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