Unitary products group G8V08012UHA11, L8V08012UHA11, PxDUB16V08001, G8V10016UHB11, L8V10016UHB11 Installation Instruction
...
INSTALLATION
TWO-STAGE ULTRA
MID-EFFICIENCY GAS-FIRED
INSTRUCTION
TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 2
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AIRFLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
OPERATION AND MAINTENANCE . . . . . . . . . . . . . . . 18
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 22
FURNACE ACCESSORIES . . . . . . . . . . . . . . . . . . . . . 25
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
VARIABLE SPEED FURNACES
Upflow / Horizontal
Models: P*DU - “V” / G8V / L8V
80 To 120 MBH Input
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL YOUR FURNACE.
SAVE THIS MANUAL
EFFICIENCY
RATING
CERTIFIED
035-17438-001 Rev. A (901)
IMPROPER INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF THE
PRODUCT COULD CAUSE PERSONAL INJURY
OR PROPERTY DAMAGE.
IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION, SERVICE OR MAINTENANCE CAN
CAUSE INJURY OR PROPERTY DAMAGE.
REFER TO THIS MANUAL FOR ASSISTANCE OR
ADDITIONAL INFORMATION, CONSULT A QUALIFIED INSTALLER, SERVICE AGENCY OR THE
GAS SUPPLIER.
THIS PRODUCT MUST BE INSTALLED IN STRICT
COMPLIANCE WITH THE ENCLOSED INSTALLATION INSTRUCTIONS AND ANY APPLICABLE
LOCAL, STATE, AND NATIONAL CODES INCLUDING BUT NOT LIMITED TO, BUILDING, ELECTRICAL AND MECHANICAL CODES.
The furnace area must not be used as a broom
closet or fo r any other storag e purposes, as a fir e
hazard may be created. Ne ver store i tems such as
the following on, near, or in contact with the furnace.
1. Spray or aerosol cans, rag s, brooms, du st mops,
vacuum cleaners or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning compounds; plastic items or containers; gasoline, kerosene, cigarette lighter fluid, dry
cleaning fluids or other volatile fluid.
3. Paint thinners and other painting compounds.
4. Paper bags, boxes or other paper products
Never bypass the safety mechanism to operate the
furnace with the blower door removed. To do so
could result in serious personal injury and/or equipment damage.
035-17438-001 Rev. A (901)
GENERAL INFORMA TION
DESCRIPTION
This Category I furnace is designed for installation in a residential or commercial application. A Category I furnace has a
fan assisted combustion system equipped with an integral
mechanical means to draw products of combustion through
the combustion chamber and heat exchanger. It may be
installed in a basement, garage, equipment room, alcove,
attic or any other indoor location where all required clearances to combustibles and other restrictions are met. It is
designed for natural gas fired operation, for use in standard
and Lo Nox applications.
Lo Nox furnaces requiring propane (LP) gas must
have the Lo Nox screens removed prior to installation and operation. See propane instruction 03514488-000 for instructions on proper removal of the
Nox screens.
High altitude and propane (LP) changes or conversions
required in order for the appliance to satisfactorily meet the
application must be made by an authorized contractor: in
Canada, a certified conversion station or other qualified
agency, using factory specified and/or approved parts.
The blower in this furnace is programmed to supply a constant volume of airflow to compensate for duct system static.
The furnace must be installed so that all electrical components are protected from water.
INSPECTION
As soon as a unit i s rece ived, it sho uld be inspe cted fo r poss ible damage during transit. If the damage is evident, the
extent of the damage should be noted on the carrier’s freight
bill.
A separate request for inspection by the carrier's agent
should be made in writing. Also, before installation, the unit
should be checked for screws or bolts which may have loos-
ened in transit.
This appliance is not to be used for temporary heating of buildings or structures under construction.
Do not install this furnace in a corrosive or contaminated atmosphere.
Do not install this furnace in a mobile h om e or rec reational vehicle.
Furnaces shall not be installed directly on carpeting,
tile or other combustible material other than wood
flooring.
2 Unitary Products Group
035-17438-001 Rev. A (901)
LIMITATIONS AND LOCATION
This furnace should be installed in accordance with all
national/local building/safety codes and requirements, or in
the absence of local codes, with the National Fuel Gas Code,
ANSI Z223.1 (latest edition) or, in Canada, CAN/CGA B149.1
or .2 (latest edition), and other applicable codes.
Use only the type of gas approved for this furnace; refer to
the furnace rating plate.
NOTES, CAUTIONS & WARNINGS
The installer should pay particular attention to the words:
NOTE, CAUTION and WARNING. NOTES are intended to
clarify or make the installation easier. CAUTIONS are given
to prevent equipment damage. WARNINGS are given to alert
the installer that personal injury and/or equipment or property
damage may occur if installation procedures are not handled
properly.
Each furnace in this series is a Category I furnace, suitable
for common venting with other gas-fired appliances as
allowed by the National Fuel Gas Code, NFPA 54/ANSI
Z223.1latest edition.
Only use natural gas in furnaces designed for natural gas. Do not use this furnace with butane. Using
wrong gas could create a hazard, resulting in damage, injury or death.
For installations above 2,000 feet, reduce input 4% for each
1,000 feet above sea level. Canadian installations must be
derated 10% for elevations from 2,000 ft. to 4,500 ft. See
Form 035-14461-000 for information to properly derate furnace.
For installations between 2000 and 4500 feet, it is not
required that the pressure switch be changed. For altitudes
above 4500 feet, the appropriate high altitude kit must be
used.
Furnace shall not be connected to a chimney flue serving a
separate appliance designed to burn solid fuel.
Check the rating plate and power supply to be sure that electrical characteristics match. All models use nominal 115 vac,
1 phase, 60 Hz. power supply.
A furnace installed in a residential garage must be located so
that all burners and burner ignition devices are located no
less than 18" above the garage floor, and located or protected to prevent damage by vehicles.
The size of the unit should be based on an acceptable heat
loss calculation for the structure. ACCA, Manual J or other
approved methods may be used.
The furnace should be located using these guidelines:
1. Where a minimum amount of vent piping and el bow s w i ll
be required.
2. As centralized with the air distribution as possible.
3. Where adequate combustion air will be available.
4. In an area where ventilation fa cilities provide for safe lim its of ambien t tempe rature u nder no rma l opera ting c onditions.
5. Where it will not interfere with proper air ci rculation in the
confined space.
6. Where the vent will not be blocked or restricted.
7. Where sufficient space is provided to allow proper service access. Mi nimum re commend ed servi ce clea rances
are as follows:
Twenty four (24) inches between the front of the furnace
and an adjacent wall or an other appliance, when access
is required for servicing and cleaning.
Eighteen (18) inches at the side where access is
required for passage to the front when servicing or for
inspection or replacement of flue/vent connections.
8. Where it will not interfere with the cleaning, servicing or
removal of other appliances.
9. Where the following minimum clearances (in inches) to
combustibles can b e main t ained . Please see, Table 1 on
page 4.
UNIT INSTALLATION
COMBUSTION AIR
All installations must comply with Section 5.3, Air for Combustion and Ventilation of the National Fuel Gas Code, ANSI
Z223.1 or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149.1 or .2
Installati on Code latest editions.
An unconfined space is not less than 50 cubic feet per 1000
Btu/hr input rating for all appliances installed in that area.
Rooms communicating directly with the space containing the
appliances are considered part of the unconfined space, if
openings are not furnished with doors.
A confined space is an area with less than 50 cubic feet per
1000 Btu/hr input rating for all appliances installed in that
area.
The following must be considered to obtain proper air for
combustion and ventilation in confined spaces.
Unitary Products Group 3
035-17438-001 Rev. A (901)
Air Source from Inside the Building
Two permanent openings, one within 12 inches of the top of
the confined space and one within 12 inches of the bottom,
shall each have a free area of not less than one square inch
per 1,000 Btuh of total input rating of all appliances located in
the space. The openings shall communicate freely with interior areas having adequate infi ltra tio n from the outside.
NOTE:
At least 100 square inches free area shall be used
for each opening.
Air Source from Outdoors
1. Two permanent openings, one within 12 inches of the
top of the confined spac e and one w ithin 12 inches of the
bottom, shall communicate directly, or by means of
ducts, with the outdoors or to such crawl or attic spaces
that freely communicate with the outdoors.
a. Vertical Ducts: Each opening must have a free
area of not less th an one square inch per 4 ,000 Btu h
of total input of all appliances located in the space.
EXAMPLE:
Total Input of All Appliances
4000
= Square Inches Free Area
b. Horizontal Ducts: Each opening must have a free
area of not less th an one square inch per 2,00 0 Btu h
of total input of all appliances located in the space.
NOTE:
Ducts must have the same cross sectional area as
the free area in the opening to whic h they are conn ected. The
minimum dimension of rectangular ducts shall be three
inches.
2. One permanent opening, commencing within 12 inches
of the top of the enclosure shall be permitted where the
equipment has clearances of at least 1 inch from the
sides and back and 6 inches from the front of the appliance. The opening shall communicate through a vertical
or horizontal duct to the outdoors, or spaces (crawl or
attic) that freely co mmunicate with the out doors and shal l
have a minimum free area of:
a. 1 sq. in. per 3000 Btu per hr of the total input rating
of all equipment located in the enclosure.
b. Not less than the sum of the areas of all vent con-
nectors in the confined space.
3. Louvers, Grilles and Screens
a. In calculating free area, consideration must be give n
to the blocking effects of louvers, grilles and
screens.
b. If the free area of a specific louver or grille is not
known, refer to Table 2 to estimate free area.
Table 1: UNIT CLEARANCES TO COMBUSTIBLES
APPLICATION TOP FRONT REAR
UPFLOW/HORIZONTAL MODELS - UPFLOW APPLICATION
UPFLOW 1 6 0 0
UPFLOW B-VENT 1 3 0 0 0 1 COMBUSTIBLE YES YES YES NO
2
HORIZONTAL
HORIZONTAL B-VENT 0 3 0 1 0 1 COMBUST IB LE NO YES YES
1.
14 1/2” cabinet models only - all other units “0” clearance
2.
14 1/2” cabinet left airflow applications only - all other units and all right hand air flow applications “0” clearance.
3.
Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the
furnace jacket and building joists, studs or framing.
3
6 0 1 0 6 COMBUSTIBLE NO YES YES
LEFT
SIDE
Table 2: ESTIMATED FREE AREA
Wood or Metal
Louvers or Grilles
2
Screens
1.
Free area or louvers an grilles varies widely; installer should
follow louver or grille manufacturer’s instructions.
2.
Do not use less than 1/4 in. mesh
Wood 20-25%
Metal 60-70%
1/4 in. mesh or larger 100%
RIGHT
SIDE
HORIZONTAL APPLICATION
FLUE
1
3
6 COMBUSTIBLE YES YES YES NO
NOTE:
1
1
to prevent main burner ignition and operation must be provided should louvers close during startup or operation.
Special Combustion and Ventilation Considerations
Operation of a mechanical exhaust, such as an exhaust fan,
kitchen ventilation system, clothes dryer or fireplace may create conditions requiring special attention to avoid unsatisfactory operation of gas appliances.
FLOOR/
CLOSET ALCOVE ATTIC
BOTTOM
If mechanically operated louvers are used, a means
LINE
CONTACT
3
YES
3
YES
4 Unitary Products Group
035-17438-001 Rev. A (901)
Specially Engineered Installations
The above requirements shall be permitted to be waived
where special engineering, approved by the authority having
jurisdiction, provides an adequate supply of air for combustion, ventilation and dilution of flue gases.
Combustion Air Quality
The recommended sourc e of comb ustio n air is to us e the outdoor air supply. Excessive exposure to contaminated combustion air will result in safety and performance related
problems. However, the use of indoor air in most applications
is acceptable, except as follows:
1. If the furnace is installed in a confined space it is recommended that the necessary combustion air come from
the outdoors by way of attic, crawl space, air duct or
direct opening.
2. If outdoor combustion air i s use d, there m ust be no exp osure to the inst all ati ons or s ub st a nc es lis ted in number 3
below.
3. The following types of installations may require OUTDOOR AIR for combustion, due to chemical exposure.
a. Commercial buildings
b. Buildings with indoor pools
c. Furnaces installed in laundry rooms
d. Furnaces installed in hobby or craft rooms
e. Furnaces installed near chemical storage areas
Exposure to the following substances in the combustion air
supply may also require OUTDOOR AIR for combustion.
f. Permanent wave solutions
g. Chlorinated waxes and cleaners
h. Chlorine based swimming pool chemicals
i. Water softening chemicals
j. De-icing salts or ch emicals
k. Carbon tetrachloride
l. Haloge n type refrigerants
m. Cleaning solvents (such as perchloroethylene)
n. Printing inks, paint removers, varnishes, etc.
o. Hydrochloric acids
p. Cements and glues
q. Antistatic fabric softeners for clothe s dryers
r. Masonry acid w ashing chemicals
VENTING
It is the responsibility of the installer to verify
proper vent system operation.
CATEGORY I VERTICAL VENTING
Category I venting consists of vertically venting one or more
appliances in B-vent or masonry chimney (as allowed), using
single wall metal pipe or B-vent connectors. Ty pe B-vent system extends in a general vertical direction and does not contain offsets exceeding 45 degrees, except that a vent system
having not more than one 60 degree offset is permitted.
NOTE:
gas appliance as allowed by the following codes and standards.
All installations must be vented in accordance with the
National Fuel Gas Code, NFPA 54/ANSI Z223.1 latest edition. For reference, the National Fuel Gas Code Handbook,
available from NFPA (item JP54HB96) is recommended. The
appliance must also be vented in compliance with all local
utility and code requirements. In Canada, the furnace must
be vented in accordance with the National Standard of Canada, CAN/CGAB149.1 and .2 latest editions.
VENTING INTO AN EXISTING CHIMNEY
Whenever possible, B-1 metal pipe should be used for venting. Where use of an existing chimney is unavoi dab le , the following rule s must be follow ed:
1. The masonry chimney must be built and installed in
2. This furnace may be vented into a fire clay tile lined
3. The chimney must extend at least three feet above the
4. The chimney must extend at least five feet above the
This appliance may be co mmon vented wi th anoth er
A furnace shall not be co nnected to a chimney flue
serving a separate appliance designed to burn
solid fuel.
accordance with nationally recognized building codes or
standards and must be lined with approved fire clay tile
flue liners or other approved liner material that will resist
corrosion, softening, or cracking from flue gases. THIS
FURNACE IS NOT TO BE VENTED INT O AN UNLINED
MASONRY CHIMNEY.
masonry chimney only if a source of dilution air is provided, such as by common venting with a draft hood
equipped water heater. If no such sour ce of di lution air is
available, Type B vent must be used, or masonry chimney vent kit 1CK0603 or 1CK0604 must be used. See
instruction 035-17452-000 to properly apply these
masonry chimney kits.
highest point where it pas ses through a roof of a bu ild ing
and at least two feet higher than any portion of the building within a horizontal distance of ten feet.
highest equipment draft hood or flue collar.
Unitary Products Group 5
035-17438-001 Rev. A (901)
VENT SAFETY CHECK PROCEDURE
If this furnace is replacing a common vented furnace, it may be necessary to resize the existing
vent line and chimney to prevent oversizing problems for the new combination of units. Refer to the
National Fuel Gas Code, ANSI Z223.1 or CAN/
CGA B149.1 or .2 Installation Code latest editions.
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the common venting system are not in operation.
1. Seal any unused openings in the common venting system.
2. Inspect venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code ANSI
Z223.1 or the CAN/CGA B149 Installation Codes and
these instructions. Determine that there is no blockage
or restriction, leakage, corrosion or other deficiencies
which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and windows and all doors b etwee n the sp ac e in whi ch t he appl iance(s) connecte d to th e venting system are loca ted and
other spaces of the building. Turn on clothes dryers and
any other appliances not conne cted to the commo n venting system.
Turn on any exhaust fans, such as range hoods and
bathroom exhausts so they will operate at maximum
speed. Do not operate a summer exhau st fan. Close fireplace dampers.
4. Follow the lighting instructions. Place the appliance
being operated in operation. Adjust thermostat so appliance will operate continuously.
5. Test for draft hood equipped appliance spillage at the
draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
6. After it has been determined that each appliance connected to the venting s ystem properl y vent s when test ed
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas burning appliance
to their previous conditions of use.
7. If improper venting is observed during any of the above
tests, the venting system must be corrected.
8. Any corrections or resizing of the common venting system must be in accordance with the National Fuel Gas
Code, ANSI Z223.1 or Section 7, Venting Systems and
Air Supply for Appliances, CAN/CGA B149.1 or .2 Installation Code latest editions. If the common vent system
must be resized, it should be resized to approach the
minimum size as determined using the appropriate
tables in Appendix G of the above codes or the venting
tables supplied with the furnace.
6 Unitary Products Group
035-17438-001 Rev. A (901)
VENT
CONNECTION
20
(Vent Size)
B
D
B
A
FRONT
28-1/2
D
3/4
40
20
13-3/4
GAS INLET
1-1/4 x 2-1/2
28-1/2
LEFT SIDE
A
C
(VENT CONNECTIONS)
POWER WIRING
7/8” HOLE
2-1/2
32-1/2
ACCESS
WIRING
7/8” K.O.
16
8-3/4
T’STAT WIRING
7/8” K.O.
MODELS
P*DU-V /
A
5-3/8
2
14-3/4
14
23-1/2
RIGHT SIDE
B
CD E F
2-1/4
1-1/8
G8V-UH / L8V-UH
80/64/1200/”A”
100/80/1600/”B”
23
100/80/2000/”C”
120/96/2000/”C”
14-1/2
17-1/2
21
21
13-1/4
16-1/4
19-3/4
19-3/4
10-1/8
15-1/4
16-5/8
16-5/8
4
10-1/8
4
11-5/8
4
13-3/8
4
13-3/8
3-3/4
3-3/4
3-3/4
3-3/4
E
TOP IMAGE
(FRONT)
F
BOTTOM IMAGE
(FRONT)
3/4”
FLANGE
FIGURE 1 : 2-Stage Upflow/Horizontal Furnace Dimensions
.
Table 3: TWO STAGE UPFLOW / HORIZONTAL RATINGS & PHYSICAL/ELECTRICAL DATA
P*DU-V /
G8V-UH
L8V-UH
INPUT
MBH H/L
OUTPUT
MBH
H/L
NOM.
CFM
CABINET
WIDTH
(IN.)
AFUE
LOW
FIRE
1
TEMP
RISE °F
HIGH
FIRE
TEMP
RISE °
MAX.
OUTLE
AIR
TEMP. °F
BLOWER
HP AMPS
SIZE
(IN.)
TOTAL
UNIT
AMPS
MAX.
OVER-
CURRENT
PROPECT
80/59 64/48 1200 A 14-1/2” 80 40 - 70 40 - 70 175 1/2 7.7 10 x 8 9 .0 20 14 117
100/65 80/53 1600 B 17-1/2” 80 40 - 70 40 - 70 170 3/4 9.6 10 x 10 12.0 20 14 128
100/65 80/53 2000 C 21” 80 40 - 70 40 - 70 170 1 12.8 11 x 10 14.0 20 12 145
120/78 96/64 2000 C 21” 80 35 - 65 35 - 65 170 1 12.8 11 x 10 14.0 20 12 147
1.
AFUE numbers are determined in accordance with DOE test procedures
2.
Wire size and overcurrent protection must comply with the National Electrical Code (NFPA-70-latest edition).
•For altitudes above 2,000 ft., reduce capacity 4% for each 1,000 ft. above sea level. Refer to instruction 035-14461-000.
•Wire size based on copper conductors, 60°C, 3% voltage drop.
•Continuous return air temperature must not be below 55°F.
MIN.
WIRE SIZE
(AWG) @
2
75 FT.
ONE WAY
OPER.
WGT.
(LBS.)
Unitary Products Group 7
035-17438-001 Rev. A (901)
DUCTWORK
The duct system's design and installation must:
1. Handle an air volume appropriate for the served space
and within the operating pa ram ete r s of the furn ac e spe cifications.
2. Be installed in accordance with standards of NFPA
(National Fire Protection Association) as outlined in
NFPA pamphlets 90A and 90B (latest editions).
3. Create a closed duct system. The supply syste m mus t
be connected to the furnace outlet and the return duct
system must be conn ect ed to the f urnace inlet. Bot h supply and return duct systems must terminate outside the
space contai ni ng the furna ce .
4. Generally complete a path for heated or cooled air to circulate through the air conditioning and heating equipment and to and from the conditioned space.
The cooling coil must be installed in the supply air
duct downstream of the furnace.
When the furnace is used in conjunction with a cooling coil,
the furnace must be installed parallel with, or in the supply air
side of the furnace.
When a parallel flow arrangement is used, the dampers or
other means used to control air flow must be a deq uate to p revent chilled air from entering the furnace, and if manually
operated, must be equipped with means to prevent operating
of either unit unless the dampe r is in the full heat or cool pos ition.
UPFLOW
Supply Plenum Connection
Attach the supply plenum to the furnace outlet duct connection flanges.
This is typically through the use of S
cleat material when a metal plenum is
used. The use of an approved flexible
duct connector is recommended on all
installations. This connection should be
sealed to prevent air leakage.
If a matching cooling coil is used, it
may be placed directly on the furnace
outlet and sealed to prevent leakage.
Follow the coil instructions for installing
the supply plenum.
On all installations without a coil, a removable access panel
is recommended in the outlet duct such that smoke or
reflected light would be observable inside the casing to indicate the presence of leaks in the heat exchanger. This
access cover shall be attached in such a manner as to prevent leaks.
Return Duct Connection
Return air may enter the furnace through the side(s) or bottom depending on the type of application. Return air may
not be connected into the rear panel of the unit. See the
specific type ap pl ica tio n installation for deta ils . Be sure to see
the Filters section of this instruction.
FILTERS INSTALLATION
All applications require the use of a filter. A high velocity filter
and retainer are provided for field installation.
Internal Installation
1. Select desired filter position (left/right side, or bottom).
Remove the corresponding cabinet cutouts per instructions provided. Refer to Figure 4 on page 9.
2. Install snap-in retainer clips into the corresponding slots
from the outside rear of the c abi net, refer to Figure 2 on
page 8. T o p revent cab inet air lea ks, inst all sn ap-in plug s
(provided) into the unused slot s at the out si de r ear of th e
cabinet.
FURNACE
(REAR CABINET)
RIGHT
SIDE
SLOTS
BOTTOM SLOTS
CABINET
SLOT
FILTER SUPPORT
CLIPS (PROVIDED)
LEFT
SIDE
SLOTS
PLUG UNUSED
CABINET SLOTS
WITH PLUGS
(PROVIDED)
FIGURE 2 : Furnace Filter Slot Locations
3. Install the wire retainer inside the cabinet. Insert the
open ends of the wire retainer into the clip loops at the
rear of the blower compa rtment. Th e reta iner wire s hould
pivot freely like a hinge, on the clips at the rear of the
cabinet. Refer to Figure 3 on page 9.
4. I nstall the filter(s) provided. Cut filte r if necessary to
match air opening in cabinet. Filter should extend
beyond opening edge as much as possib le to prevent air
from bypassing the filter. DO NOT remove stiffening rods
from inside the filter. Shorten the rods, if necessary, to
match final filter size.
8 Unitary Products Group
035-17438-001 Rev. A (901)
POSITION WIRE RETAINER
PROVIDED UNDER FLANGE
FILTER
CLIPS
RIGHT SIDE
INSTALLATION
SHOWN
PROVIDED
FURNACE
FRONT
FIGURE 3 : Side Filter Retainer Placement
5. Position the filter between the wire retainer and the cabinet wall (or floor) so it completely covers the cabinet air
opening and secure the filter in place at the front of the
cabinet by fastening the closed (looped) end of the
retainer wire under the flanged edge of the cabinet.
When properly installed the filter should fit flush with all
four sides of the cabinet wall.
NOTE:
exceed 300 feet per m inute. Al l vel ocitie s over thi s requi re the
use of high velocity filters.
Side Return External Filter
Locate and knock out the square corner locators. These indicate the size of the cutout to be made in the furnace side
panel, refer to Figure 4.
Air velocity through throwaway type filters may not
NOTE:
Some accessories such as electronic air cleaners
and pleated media may require a larger side opening.
All installations must have a filter installed.
The return duct may be attached to the furnace by S-cleat,
bend tabs or other approved methods. Be sure to seal the
duct to the furnace to prevent air leakage.
In order to achieve the airflow indicated in the table, it is recommended for those applications over 1800 CFM use return
from two sides, one side and the bottom, or bottom only. For
bottom only application, see data and notes on blower performance tables in this manual.
Where the return duct s ys tem i s not c om pl ete , th e re turn co nnection must run full size to a location outside the utility room
or basement. For further details, consult Section 5.3 (Air for
Combustion and Ventilation) of the National Fuel Gas Code,
ANSI Z223.1, or CAN/CGA B149.1 or .2, Installation Code
latest editions.
Bottom Return
Bottom return applications normally pull return air through a
base platform or return air plenum. Be sure the return platform structure is suit abl e to s upp ort the we ig ht of th e furn ac e.
Refer to Figure 1 on page 7 for unit dimensions and Table 3
on page 7 for unit weights. Be sure to sea l the furnace to plenum connection to prevent air leakage.
The bottom panel is equipped with a perforated opening for
easy removal. Tabs must be cut with sheet metal snips to
allow removing kno ck out . Scri be mark s are i nc lud ed fo r form ing flanges for attachment of the return air ductwork.
NOTE:
If an external mounted filter rack is being used, see
the instructions provided with that accessory for proper hole
cut size.
Upflow attic installations must meet all minimum clearances
to combustibles and have floor support with required service
accessibility.
CORNER
MARKINGS
FIGURE 4 : Side Return Cutout Markings
Install the side filter rack following the instructions provided
with that accessory. If a filter(s) is provided at another location in the return air system, the ductwork may be directly
attached to the furnace side panel.
Unitary Products Group 9
FRONT OF
FURNACE
APPLICATION
HORIZONTAL
NOTE:
the instructions provided with that accessory for proper hole
cut size.
If an external mounted filter rack is being used, see
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