Non--Condensing Gas Furnaces 80+ Upflow/Horizontal Furnaces

Non--Condensing Gas Furnaces
80+ Upflow/Horizontal Furnaces
H8UH5, MUF, HL
!
FIRE OR EXPLOSION HAZARD.
Ò
Failure to follow safety warnings exactly
could result in death, serious injury
and/or property damage.
Ò
-- -- Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
· Do NOT try to light any appliance.
· Do NOT touch any electrical switch; do NOT
use any phone in your building.
· Leave the building immediately
· Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
· If you cannot reach your gas supplier, call the
fire department.
-- -- Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
-- --
Installer: Affix these instructions
on or adjacent to the furnace.
Consumer: Retain these
instructions for future reference.
International Comfort Products, LLC
Lewisburg, TN 37091
Printed in U.S.A.
(07/06/2004)
441 02 5002 03
User’s Information Manual
Contents
Danger, Warning and Caution . . . . . . . . . . . . . . . .
Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion Air (Your Safety) . . . . . . . . . . . . . . . .
Indoor Humidity (Your Comfort) . . . . . . . . . . . . . .
2
3
4
5
About Your Furnace . . . . . . . . . . . . . . . . . . . . . . . 5
Operating Your Furnace . . . . . . . . . . . . . . . . . . . . 6
Furnace Maintenance . . . . . . . . . . . . . . . . . . . . . . 8
Danger, Warning and Caution
Recognize safety information. This is the safety--alert symbol
Product Labeling
. When you see this symbol on the furnace and in instruction
manuals be alert to the potential for personal injury.
Signal words are used in combination with colors and/or pictures
on product labels. Following are examples of product labels with
explanations of the colors used.
!
Understand the signal words DANGER, WARNING and
CAUTION. These words are used to identify levels of hazard seriousness. The signal word DANGER is only used on product labels to signify an immediate hazard. The signal words WARNING
and CAUTION will be used on product labels and throughout this
manual and other manuals that may apply to the product.
Danger Label
White lettering on a black background except the word DANGER
which is white with a red background.
! DANGER
Signal Words
Electric Shock Hazard
DANGER -- Immediate hazards which WILL result in severe personal injury or death.
Failure to observe could
result in death, bodily injury
and/or property damage.
WARNING -- Hazards or unsafe practices which COULD result in
severe personal injury or death.
CAUTION -- Hazards or unsafe practices which COULD result in
minor personal injury or product or property damage.
“NOTE” is used to highlight suggestions which will result in enhanced installation, reliability or operation.
Signal Words in Manuals
Turn off all power
before servicing.
Warning Label
White lettering on a black background except the word WARNING which is black with an orange background.
! WARNING
The signal word WARNING is used throughout this manual in the
following manner:
!
FIRE HAZARD
WARNING
Failure to observe could
result in death, bodily injury
and/or property damage.
Use copper wire only.
The signal word CAUTION is used throughout this manual in the
following manner:
!
Caution Label
White lettering on a black background except the word CAUTION
which is black with a yellow background.
DANGER
! CAUTION
CUTS AND ABRASION
HAZARD
Failure to observe could
result in bodily injury.
Wear gloves and handle with
care.
2
441 02 5002 03
User’s Information Manual
WARNING
!
CARBON MONOXIDE POISONING HAZARD.
Carbon monoxide poisoning could result in death
from asphyxiation or serious bodily injury.
If you experience headaches, nausea, or
dizziness, carbon monoxide may be present.
Leave the house immediately and call your gas
supplier.
Safety Rules
Your furnace is built to provide many years of safe and dependable service providing it is properly installed and maintained.
However,abuse and/or improper use can shorten the life of the
furnace and create hazards for you, the owner.
A.
B.
The U.S. Consumer Product Safety Commission recommends that users of gas--burning appliances install carbon
monoxide detectors. There can be various sources of carbon monoxide in a building or dwelling. The sources could
be gas--fired clothes dryers, gas cooking stoves, water
heaters, furnaces, gas--fired fireplaces, wood fireplaces,
and several other items. Carbon monoxide can cause serious bodily injury and/or death. Carbon monoxide or “CO” is
a colorless and odorless gas produced when fuel is not
burned completely or when the flame does not receive sufficient oxygen.
Therefore, to help alert people of potentially dangerous
carbon monoxide levels, you should have carbon monoxide detectors that are listed as complying with a standard
by a nationally recognized agency (e.g. ANSI/UL
2034--2002, CSA 6.19--01, or International Approval Services 6--96) installed and maintained in the building or
dwelling (see Note below).
There can be numerous sources of fire or smoke in a building or dwelling. Fire or smoke can cause serious bodily injury, death, and/or property damage. Therefore, in order to
alert people of potentially dangerous fire or smoke, you
should have fire and smoke detectors that are listed by Underwriters Laboratories installed and maintained in the
building or dwelling (see Note below).
Note: The manufacturer of your furnace does not test any detectors and makes no representations regarding any brand
or type of detector.
C.
To ensure safe and efficient operation of your furnace, you
should do the following:
1. Thoroughly read this manual and labels on the furnace. This will help you understand how your furnace operates and the hazards involved with gas and electricity.
2. The furnace area must be kept clear and free of combustible materials, gasoline, and other flammable vapors and liquids.
3. Do not use this furnace if any part has been underwater. A flood--damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion.
Immediately call a qualified service agency to inspect the
furnace and to replace all control system parts, electrical
parts, and gas controls which have been wet or the furnace,
if deemed necessary.
441 02 5002 03
4. Never block or obstruct the openings on the furnace,
or any ducts that provide air to the furnace. Air must be
provided for proper and safe operation of the furnace for
combustion and ventilation of flue gases. See the “Com-
bustion Air (Your Safety) section of this manual.
5. Familiarize yourself with the possible air starvation
signals. These are outlined in the Combustion Air section.
6. Check the combustion air supply. Some models use air
drawn from outdoors, See NO TAG. Other models and other appliances use combustion air from inside the structure.
Air starvation signals are given in the following “Combustion Air (Your Safety)”. section of this manual. If any of the
signals are noticed, perform a combustion air check as
shown in the following Combustion Air Checks section of
this manual or call a qualified service agency. If you add
weather stripping, storm windows, insulation, an additional
fuel burning appliance, or remodel the structure, a combustion air check MUST be accomplished after the addition
7. Maintain safety and service clearances from the furnace. These clearances are listed on the furnace rating
plate. Keep the furnace area clean and free of combustible
materials at all times. Never store gasoline, paint, aerosol
cans, waxes, bleaches, dry cleaning fluid or items such as
paper or rags near the furnace.
8. Examine the furnace area when the furnace or additional insulation is added since some insulation materials may be combustible. Furnace must be kept free and
clear of exposed or loose insulation materials in the area of
installation.
9. Check the return air duct connection. The duct connection must be physically sound, sealed to the furnace casing
and must terminate outside the space containing the furnace.
10.Should the gas supply fail to shut off or if overheating
occurs, shut off the gas valve to the furnace before
shutting off the electrical supply. Read the label on the
front of the furnace and the Operating Your Furnace section of this manual for steps to turn off the furnace.
11.Familiarize yourself with all controls. Make sure you
know how to shut off the gas and the electrical power to the
furnace. Read the label on the front of the furnace and the
Operating Your Furnace section of this manual for steps to
start and turn off the furnace. If the furnace is to be shut
down for an extended length of time (example; remodeling
project), turn off both the gas and the electrical power. For
safety, always turn them off before performing service or
maintenance on the furnace.
12. Establish a regular service and maintenance schedule. This will ensure efficient and safe operation of the furnace. It is recommended that you have a qualified service
agency perform a complete check on the furnace before
each heating season. See furnace Qualified Agency
Checks and Combustion Air Checks section of this manual.
13. Monthly Inspection. A properly adjusted gas furnace
should not require cleaning at frequent intervals, but it
should be inspected regularly to ensure safe and efficient
operation. A brief monthly inspection is recommended that
does not require disassembly. Examine the furnace installation to determine that:
a. All flue gas carrying areas external to the furnace (i.e.
chimney, vent connector) are clear and free of obstructions.
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User’s Information Manual
b. The vent connector is in place, slopes upward and is
physically sound without holes or excessive corrosion.
Figure 2
c. (Upflow or downflow installations with duct connection
at bottom only.) The physical support of the furnace is
sound without sagging, cracks, gaps, etc., around the
base so as to provide an air seal between the support
and the base.
Pilot Burner
Flame Sensor
Pilot Burner
d. There should be no obvious signs of deterioration of the
furnace.
e. Check that the pilot and burner flames are in good adjustment. To inspect the Pilot and Main Burner flames it
will be necessary to remove the louvered door on the
front of the furnace, except for furnaces not having any
louvers in the doors. The doors of these furnaces must
remain installed (to prevent changes in flame appearance) while inspecting the Pilot and Main Burner flames
through the view port in the door. Contact a qualified
service agency at once if an abnormal flame appearance is identified.
Main Burner Flame: Check for the following:
· Stable and blue flames. See Figure 1.
· Flames extending directly from burner into heat
exchanger.
· Flames do NOT touch sides of heat exchanger.
NOTE: Dust may cause orange tips or wisps of yellow, but flames
MUST NOT have solid, yellow tips.
Figure 1
Main Burner
Burner Face
10--10--78
Pilot Burner Flame: While the main burner is ON, the
flame should envelop the upper part of the Flame Sensor, as shown in Figure 2.
f. With the equipment shutoff valve turned OFF, remove
the burner compartment door of the furnace to use a
flashlight to inspect the visible parts of the burners and
igniter. Check for loose soot and give particular attention to obvious deterioration from corrosion or other
sources. If soot or deterioration is found inside the furnace, DO NOT OPERATE FURNACE; call a qualified
service agency.
g. Inspect the drain line and overflow line monthly (air conditioning cooling coils attached to furnace).
4
Proper Flame
Adjustment
Flame Sensor
3/ ² to 1/ ²
8
2
Hot Surface
Igniter
10--11--65
Combustion Air (Your Safety)
!
WARNING
CARBON MONOXIDE POISONING HAZARD
Lack of combustion air could result in carbon
monoxide gas which could cause death or serious bodily injury.
All fuel--burning appliances must be provided
with enough fresh air for proper combustion and
ventilation of flue gases.
Some models use air from the space in which
they are located, and other appliances in the
same space may also be using indoor air for ventilation and/or combustion.
New materials and methods are being used in construction and
remodeling which result in lower energy costs for heating and
cooling. It may also mean your appliances may not be getting
enough air for combustion and ventilation of flue gases. The use
of exhaust fans, fireplaces, clothes dryers, and other appliances
consume air or vent it to the outdoors.
If the gas appliances or furnace can’t get enough air, two conditions may result:
1.
2.
The appliances or furnace may produce carbon monoxide
gas.
The appliance may not vent flue gases properly. The following are signs that your appliances may not be getting
enough air for proper combustion.
Be aware of these signals;
1.
2.
3.
Headaches--Nausea--Dizziness
Excessive humidity--heavily frosted windows or a
moist “clammy” feeling in the structure.
Smoke from the fireplace won’t draw up the
chimney.
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User’s Information Manual
WARNING
!
If draft hood spillage is indicated:
CARBON MONOXIDE POISONING HAZARD.
Carbon monoxide poisoning could result in death
from asphyxiation or serious bodily injury.
If you experience headaches, nausea, or
dizziness, carbon monoxide may be present.
Leave the house immediately and call your gas
supplier.
1.
2.
3.
Combustion Air Checks
If any of the above signals are noticed, perform a combustion air
check or call a qualified service agency. If you add weather stripping, storm windows, insulation, an additional fuel burning appliance, or remodel the structure, a combustion air check MUST
be accomplished after the addition.
Make the inspection as follows:
1.
Close all doors and windows. If you have a fireplace, start a
fire and wait until flames are burning vigorously.
Turn on all exhausting devices, such as: kitchen and bathroom exhaust fans and dryers (gas or electric).
Turn on all vented gas appliances, such as: heating equipment (includes any room heaters) and water heaters.
Wait ten (10) minutes for drafts to stabilize.
On appliances with a draft hood, check for spillage by holding a lighted match 2 inches from the draft hood opening.
Reference Figure 3, which shows a water heater draft
hood.
2.
3.
4.
5.
Vent Pipe
Indoor Humidity (Your Comfort)
Relative humidity is important to your health. Proper humidification helps cut down incidences of respiratory illness. Air that is too
wet may damage the building structure. Air that is too dry is uncomfortable. A quick way to test for proper humidity is as follows:
1.
2.
If the humidity is too high, try these suggestions to lower the humidity:
Draft Hood
Typical Gas
Water Heater
1.
2.
Match
A.
Match flame pulls toward draft hood.
This indicates no spillage and that appliance is getting
enough air for combustion. Return exhausting devices and
appliances to the condition in which you found them .
Match goes out or flame wavers away from draft hood. This
indicates spillage and that appliance is not getting enough
air for combustion.
B.
!
WARNING
CARBON MONOXIDE POISONING HAZARD.
Carbon monoxide poisoning could result in death
from asphyxiation or serious bodily injury.
Draft hood spillage means there is not enough air
for proper combustion and carbon monoxide may
be present.
Keep a window open (a minimum of 2²² ) near the
appliance until a permanent combustion air duct
is installed. Contact a qualified service agency.
441 02 5002 03
Look for frequent fogging or excessive condensation on
the inside of windows. This indicates the indoor humidity
level is too high for outdoor weather conditions.
Drop three ice cubes into a glass of water and stir. If, within
three minutes, moisture does not form on the glass, the air
is too dry and a humidifier would be beneficial. (Do not perform this test in the kitchen, cooking vapors may produce
inaccurate results.)
A good relative humidity is one just high enough to barely start
condensation along the lower edges or lower corners of the windows, when it is cold outside. More than that can be damaging.
Water Heater Draft Hood
Figure 3
4.
Check for plugged vent connectors and chimneys. Repair
stoppage and test again.
If you have a fireplace, open a window or door near the fireplace and then check for spillage. If spillage stops, do not
use the fireplace until you can supply fresh air by a permanent duct.
If you have kitchen and bathroom exhaust fans, turn them
OFF and check for spillage.
If spillage stops, do not use exhaust fans until you can supply fresh air by a permanent duct. Circuit breakers for fans
should be turned off and marked as to why they are off.
Spillage means air starvation and that an outdoor air duct
or air intake must be installed to provide air directly to the
area around the furnace. This duct or intake MUST comply
with local and state building codes or in their absence with
the National Fuel Gas Code NFPA 54/ANSI Z223.1--2002.
3.
4.
5.
6.
7.
Reduce setting or discontinue use of humidifier.
Use range and bathroom exhaust fans while cooking and
bathing. Open a door or window for a few minutes to bring
in cool drier air.
Cook with pans covered.
Take shorter baths or showers with cooler water.
Install a fresh air intake duct. Cold, dry air brought in from
outside to the furnace area lowers the indoor humidity level.
Have appliances checked. A malfunctioning appliance can
contribute water vapor to the structure.
If the problem continues, consult a heating contractor
about adding a heat recovery ventilator or air--to--air heat
exchanger.
About Your Furnace
Figure 4 shows the location of the components in the furnace.
Circulating Air Blower
The blower circulates room air through the furnace, air ducts, and
into the rooms of the structure. The blower can be set at the thermostat for automatic or manual operation. In manual mode the
blower operates continuously. In automatic, the blower does not
come on until a preset time after the gas valve is energized. When
the structure reaches the temperature set on the thermostat, the
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User’s Information Manual
furnace will shut off. The blower will continue to run until the furnace cools down.
Thermostat
There are many types and styles of thermostats. Most thermostats control both heating and cooling functions and have a Fan
Switch with AUTO and ON settings. On AUTO, the Circulating Air
Blower will cycle on/off with the furnace, on the heating speed unless a call for cooling is initiated. Blower speed will correspond to
the mode of operation of the furnace. If the Fan Switch is positioned to ON the blower will run continuously.
In addition some thermostats are programmable with multiple set
backs. The set backs can be pre--programmed to lower or raise
the temperature automatically.
Figure 4
Be sure to become familiar with your thermostat.
Rating Plate
The rating plate contains important information for the service
technician and lists the complete model, manufacturing and serial
numbers. You should always provide all these numbers when requesting parts or if you need service. See Figure 4 for rating
plate location.
Door Interlock Switch
All the electrical power for the furnace goes through the door interlock switch. The interlock switch interrupts electrical power to the
furnace when the blower door is removed. The furnace will not operate until the blower door is reinstalled.
Component Locations for 80+ Furnaces
Venter
Heat Exchanger
Manual Equipment
Shutoff Valve
Pressure Switch
Circulating Blower
Furnace Main Gas
Control Valve
Main Burners
Drip Leg
Circulating Blower
Motor
Fan/Delay
Control
Rating
Plate
Representative drawing only, some models may vary in appearance.
25--24--30v--1
Fan Control
Electronic Ignition Module/Gas Control Valve
The fan/delay control provides power to the circulating air blower
to keep it on furnace until the furnace cools down.
When the thermostat calls for heat it completes a circuit to the
electronic ignition module. The module sends an electrical signal
which ignites the pilot, and then opens the gas valve.
The fan off--delay setting can be adjusted if the fan remains on
long enough that cool drafts are felt in the room after the furnace
shuts off.
When the flame is firmly established, the igniter shuts off. If there
is a malfunction, the gas valve automatically shuts off the gas.
Pressure Switch
The off--delay is set by moving a set of switches on the control.
The Wiring Diagram located on the inside of the blower door
shows the various delay combinations. Refer to Figure 4 for location of the control.
The furnace is equipped with one pressure switch to shut down
the furnace under various flue conditions. The switch is connected to the furnace by factory supplied tubing.
If you are unsure how to set the Fan Control, contact a Qualified
Service Agency.
Keep the blower access door and all access panels in place except for inspection or maintenance.
6
Operating Your Furnace
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User’s Information Manual
Before starting your furnace be sure you read and understand all
of the procedures in this manual. Check to make sure the furnace
filter is clean and correctly installed.
3.
Remove the burner compartment door by removing the two
(2) screws securing the door in front and lifting the door up
and outwards. Removing the door will expose the gas control valve switch.
WARNING
4.
Slide the gas control valve switch to OFF.
5.
Failure to provide adequate combustion and
ventilation air could result in death and/or
personal injury.
Turn OFF electric power to the furnace at the disconnect
switch or circuit breaker. (May be left ON for set--back type
thermostat with batteries, provided thermostat has system
select switch placed in the OFF position.)
6.
Reinstall all doors.
Provisions for combustion and ventilation air
must be provided for in accordance with
installation instructions supplied with furnace.
Figure 5
!
CARBON MONOXIDE POISONING HAZARD
Honeywell Gas Control Valve
Starting The Furnace
See Figure 5 for an illustration of the gas control valve.
1.
Turn the thermostat to its lowest temperature setting or to
OFF if equipped with a System Select Switch.
2.
Turn OFF all electric power to the furnace at the disconnect
switch or circuit breaker.
3.
Remove the burner compartment door by removing the
two(2) screws securing the door in front and lifting the door
up and outwards. Removing the door will expose the gas
control valve switch.
4.
Slide the gas control valve switch to OFF. See Figure 5.
5.
Wait five (5) minutes to clear out any gas. If you then smell
gas, STOP! Follow the safety information on the cover of
this manual. If you do not smell gas, go to the next step.
6.
Slide the control valve switch to ON.
7.
Reinstall all doors.
8.
Turn ON all electrical power to the furnace.
9.
Set the thermostat to the desired temperature and the System Select Switch to HEAT.
The furnace will activate an igniter which lights the pilot flame.
When the pilot lights and verifies a steady flame, the ignition system brings on the main burners.
System Retries
The ignition system tries to relight the burners whenever the built-in flame sensor detects no flame while the thermostat calls for
heat.
Turning Off The Furnace
Set the thermostat to the lowest temperature setting or set System Select Switch to OFF if so equipped.
Should overheating occur or the gas control valve fail to shut
off, shut off the manual equipment shutoff valve to the furnace before shutting off the electrical supply.
Extended Shutdown
1.
Set thermostat to lowest temperature setting or set thermostat System Select Switch to OFF if so equipped.
2.
Turn Manual Equipment Shutoff Valve for furnace to OFF
position, (at right angle or 90° to gas line).
441 02 5002 03
OUTLET
On\Off
Switch
INLET
Diagnostic Light
dwg 25--23--31a
L P Model Furnaces
!
WARNING
FIRE OR EXPLOSION HAZARD
Failure to detect and stop gas leak could result in
death, bodily injury, or property damage.
Propane gas is heavier than air. Leaking gas can
settle in low areas such as crawl space. If you
suspect the presence of gas, follow the
instructions on the cover of this manual.
If your LP gas Furnace is installed in an excavated or low lying
area, we recommend that you contact your LP gas supplier about
installing a warning device that would alert you of a gas leak.
Frozen Water Pipe Hazard
!
CAUTION
FROZEN AND BURST WATER PIPE HAZARD.
FaiIure to protect against frozen pipes may result
in burst water pipes, serious property damage
and/or personal injury.
Furnace may shut down. Do not leave your home
unattended for long periods during freezing
weather without turning off water supply and
draining water pipes or otherwise protecting
against the risk of frozen pipes.
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User’s Information Manual
Air Filters/Monthly
!
FROZEN AND BURST WATER PIPE HAZARD.
FaiIure to protect against frozen pipes could result in
burst water pipes, serious property damage and/or
personal injury.
Furnace may shut down. Do not leave your home
unattended for long periods during freezing weather
without turning off water supply and draining water pipes
or otherwise protecting against the risk of frozen pipes.
Your furnace is designed solely to provide a safe and comfortable
living environment. The furnace is NOT designed to ensure that
water pipes will not freeze. It is equipped with several safety devices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.
If your furnace remains off for an extended time, the pipes in your
home could freeze and burst, resulting in serious water damage.
If the structure will be unattended during cold weather you should
take these precautions.
1.
Turn off the water supply to the structure and drain the water lines if possible and add an antifreeze for potable water
to drain traps and toilet tanks. Open faucets in appropriate
areas.
--or--
2.
Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes
from freezing. Instruct them on a qualified service agency
to call to provide service, if required.
--or--
3.
Install a reliable remote sensing device that will notify
somebody of freezing conditions within the home.
Furnace Maintenance
Have your furnace inspected and serviced on an annual basis
(before the heating season) by a qualified service agency.
Labeling
!
FIRE OR EXPLOSION HAZARD
Wiring errors can cause improper and dangerous
operation that could result in death, bodily injury,
and/or property damage.
Label all wires prior to disconnection when
servicing controls. Verify proper operation after
servicing. Only qualified service agencies should
attempt electrical service.
Pressure Switch
During regular yearly maintenance, check for cracks in any
tubes on the pressure switch.
!
FIRE HAZARD
Failure to clean internal furnace parts could result
in death or bodily injury.
Fire hazard from dust and lint buildup on internal
furnace parts. Only a qualified service agency
should clean furnace internal parts.
Never operate furnace without an air filter installed.
The air filter(s) should be inspected at least monthly and
cleaned or replaced as required. There are two types of filters
that are commonly used. Washable filters (constructed of aluminum mesh, foam, or reinforced fibers) may be cleaned by
soaking in mild detergent and rinsing with water. The fiberglass disposable type should be REPLACED before it becomes clogged.
Remember that dirty filters are the most common cause of inadequate heating or cooling performance.
!
CAUTION
RISK OF REDUCED FURNACE LIFE
Use of excessively dirty and/or restrictive air
filters may increase furnace operating
temperatures and shorten the life of the furnace.
Filters specified for the furnace are rated at a
maximum of 600 FPM air velocity and sized for the
furnace’s airflow rate. Replacement filters must be of
equivalent type, size, and rating except as described
below.
Disposable, low--velocity filters may be used to replace
washable, high--velocity filters, providing they are sized
for 300 FPM or less.
If you are uncertain of the type of replacement filter to
use, consult the furnace installer or a qualified service
agency for assistance.
Replacement Filters
If the filter is not located at or within the furnace, it should be located somewhere in the return--air duct system.
Table 1 lists recommended sizes and types of filters that may be
used with your furnace, based on the furnace’s heating gas input
rate.
Replacement filters should be of the same type and size as the
originals, to ensure adequate air flow and filtering. A disposable
low velocity filter can be replaced with a washable high velocity
type. Do not replace a high velocity filter with a disposable low velocity filter, except as permitted below.
If a cleanable (high--velocity) filter(s) is to be replaced with a disposable (low--velocity) filter(s), the airflow area of the filter(s) must
be doubled (i.e., a second filter of the same size must be installed
so that only half of the air goes through each filter). A second return--air duct to the furnace must be added in which to install the
second filter. Modification of a furnace installation shall comply
with the local installation code and the furnace installation instructions, and shall be made only by a Qualified Service Agency.
NOTE: Some filters are marked with an arrow to indicate the
proper direction of air flow through the filter. The air flow di-
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441 02 5002 03
User’s Information Manual
rection will be towards the blower motor. Make sure filter is
installed correctly.
Filter Replacement
6.
Turn on electric power to furnace.
Bottom Mounted Filter
Figure 7
The filter may be installed in the bottom of the blower compartment, or the filter rack may be installed under the furnace or on
either or both sides of the furnace. A plastic end cap is inserted in
the filter rack after the filter is installed. The end cap keeps air fromescaping around the open end of the filter rack. See Figure 6
and Figure 7 for side and bottom locations. Rack end cap is similar for bottom mounted filter rack.
Center clip side--to--side
Filter racks attached to the outside of the furnace are made so the
filter simply slides out one side for removal.
Filter Replacement -- Bottom or Side
Mounted Filter Rack Outside Furnace
1.
2.
3.
4.
5.
6.
Turn off electric power to furnace.
Remove the end cap from the filter rack.
Slide the filter out of the filter rack. See Figure 6.
Inspect the filter(s) and replace or clean washable types. If
filter is aluminum mesh it should be recoated with filter
coating spray.
Reinstall the end cap in the filter rack.
Turn on electric power to furnace.
Figure 6
9²
Table 1
25--24--18--1
Recommended Filter Sizes
Filter Sizes
Surface Area (Sq. In.)/Nominal Size (inches)
Furnace Size
Heating Gas
Input Rate
1000 x Btuh
Disposable Filters (300 FPM)
Purchased Separately
Cleanable Filters
(600 FPM)
Supplied with Furnace
50
350 or 14 x 25 (2Req.)
350 or 14 x 25
75
350 or 14 x 25 (2Req.)
350 or 14 x 25
100
400 or 16 x 25 (2Req.)
400 or 16 x 25
125
500 or 20 x 25 (2Req.)
500 or 20 x 25
140
600 or 24 x 25 (2 Req.)
600 or 24 x 25
Filter Racks
Lubrication
The blower motor and the venter are prelubricated by the
manufacturer and DO NOT require oiling.
Qualified Service Agency Checks
Filter Rack End cap
25--24--62--1
When the furnace is being inspected for condition and operation have the Qualified Service Agency check the following
items.
1.
Filter Replacement -- Bottom Mounted
Filter Inside Furnace
1.
2.
3.
4.
5.
Turn off electric power to furnace.
Remove blower door.
Slide filter straight out toward you. See Figure 7.
Inspect the filter(s) and replace or clean washable types. If
filter is aluminum mesh it should be recoated with filter
coating spray.
Replace blower door.
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Check all flue gas passages including main and pilot burners, heat exchanger, and vent.
2.
Check electrical wiring and connections.
3.
Check supply and return air ducts for leakage, blockage
and connections to furnace.
4.
Check circulating air blower wheel and motor. Clean them if
required.
5.
Perform an operational checkout on the furnace to be sure
safety controls function and that furnace operates properly.
For additional information, the Qualified Service Agency can
consult the installation instructions for the furnace.
9
User’s Information Manual
10
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User’s Information Manual
441 02 5002 03
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