THE COMFORT PRODUCTS PEOPLE
WINDOW WALL FURNACE
DIRECT-VENT NATURAL GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
2503532
4003532
25,000 and 40,000 BTU/Hr Furnaces
WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
FOR YOUR SAFETY
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.
•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.
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage.Refertothismanual for correct installation and operational procedures. For assistance or additional information consult a qualified installer, service agency, or the gas supplier.
— Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
This appliance may be installed in an aftermarket*, permanently located, manufactured (mobile) home, where not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference.
THE COMFORT PRODUCTS PEOPLE
DIRECT-VENT NATURAL GAS HEATER
SAFETY
INFORMATION
WARNINGS
IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate, or service this furnace. Improper use of this furnace can cause serious injury or death from burns, fire, explosion, electrical shock, and carbon monoxide poisoning.
DANGER: Carbon monoxide poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, and/or nausea. If you have these signs, the furnace may not be working properly. Get fresh air at once! Have furnace serviced. Some people are more affected by carbon monoxide than others. These include pregnant women, people with heart or lung disease or anemia, those under the influence of alcohol, and those at high altitudes.
Natural Gas: Natural gas is odorless. An odormaking agent is added to natural gas. The odor helps you detect a natural gas leak. However, the odor added to natural gas can fade. Natural gas may be present even though no odor exists.
Make certain you read and understand all warnings. Keep this manual for reference. It is your guidetosafeandproperoperationofthisfurnace.
WARNING: Any change to this heater or its controls can be dangerous.
Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies.
Carefully supervise young children when they are in the same room with furnace.
Do not place clothing or other flammable material on or near the appliance. Never place any objects on the furnace.
Surface of furnace becomes very hot when running furnace. Keep children and adults away from hot surface to avoid burns or clothing ignition. Furnace will remain hot for a time after shutdown. Allow surface to cool before touching.
Turn off furnace and unplug and let cool before servicing. Unless you need gas supply for testing, shut off equipment shutoff valve before servicing. Only a qualified service person should service and repair furnace and venting system.
Replace any safety screen or guard removed for servicing before operating furnace.
You must keep control compartments, burners, and circulating air passages clean. More frequent cleaning may be needed due to excessive lint and dust from carpeting, bedding material, etc. Turn off the gas valve and unplug before cleaning furnace.
1.A qualified service person must install furnace.
2.This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.
3.Use only natural gas. Do not convert furnace to use different fuel type.
4.If you smell gas
•Shut off gas supply.
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any phone in your building.
•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.
5.Do not block the flow of combustion air (outside air) or heated air (room air) to the furnace.
6.This furnace must have fresh air for proper operation. If not, poor fuel combustion and improper venting of flue
gases will result. Carbon monoxide poisoning from backed-up flue gases could occur. The State of California lists carbon monoxide as a reproductive toxin under Proposition 65.
7.Never install the furnace
•in a recreational vehicle
•in an alcove
•on an inside wall
•as a fireplace insert
•in high traffic areas
•in windy or drafty areas
•behind a door or where an open door would block normal air flow
8.Provide the following minimum furnace clearances from furnace front cover to combustibles (as viewed from the front of furnace):
Below Front Cover: 6 inches Adjoining Wall: 12 inches Above Front Cover: 12 inches Front: 8 feet
9.Do not obstruct the flow of combustion and ventilation air in any way. Provide adequate clearances around air openings into the combustion chamber along with adequate accessibility clearance for servicing and proper operation.
10.Provide the following minimum furnace clearances from furnace cabinet (portion of cabinet extending into outside air, as viewed from the rear of furnace):
Cabinet Back: 36 inches Cabinet Sides: 6 inches
Cabinet Bottom: Must be high enough off the ground to prevent snow, water, leaves, or any other objects from blocking cabinet vents.
11.Always follow lighting instructions. Never attempt to light burner with a match or butane torch.
12.Do not run furnace
•where flammable liquids or vapors are used or stored
•under dusty conditions
13.Do not use furnace as a cooking device.
14.Do not alter furnace or its controls. Any change may create a safety hazard.
15.Do not use furnace if any part has been under water. Immediately call a qualified service person to inspect the furnace and to replace any part of the control system and any gas control which has been under water.
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201842 |
OWNER’S MANUAL
LOCAL CODES
Install and use furnace with care. Follow all local codes. In the absence of local codes, use the latest edition of the following:
•National Fuel Gas Code ANS Z223.1, also known as NFPA 54 * (USA)
•National Electric Code ANS/NFPA 70*
•CAN/CGA-B149[.1 or .2] Installation Codes** (Canada).
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
**Available from:
Standards Council of Canada
350 Sparks Street
Ottawa, Ontario K1R 7S8
This furnace must be grounded when installed. Follow all local codes. In the absence of local codes, refer to the National Electrical Code ANS/NFPA No. 70 (U.S.A.) or CSA C22.1 Canadian Electrical Code, Part I (Canada).
The installation must conform with local codes, in the absence of local codes, with the
National Fuel Gas Code, ANS Z223.1/Canadian Installation Code, CAN/CGA B149.
When installing furnace in a manufactured (mobile) home, follow the Manufactured Home Construction and Safety Standard, Title 24CFR, Part 3280 (formerly the Federal Standard for Mobile Home Construction and Safety, Title 24, part 280; 1975). When such a standard is not applicable, follow the Standard for Manufactured Home Installations, 1982 (Manufactured Home Sites, Communities, and Set-Ups), ANS A225.1/NFPA 501A.
In Canada, install furnace in accordance with
Standard CSA Z240.4 - Gas Equipped Recreational Vehicles and Mobile Housing and any applicable local codes and regulations.
Appliance input ratings are based on sea level operation and need not be changed for operation up to 2,000 feet elevation. For operation at elevations above 2,000 feet, manufactured to specified deration conditions for Canada and the United States.
UNPACKING
1.Remove furnace from carton.
2.Remove all protective packaging applied to furnace for shipment.
3.Remove the following items from carton:
•Hardware package containing four large screws, two small screws, and thermostat mounting plate
•Hardware package (thermostat and two screws)
•Equipment shutoff valve
If any of these items are missing, promptly inform dealer where you bought furnace.
4.Check furnace for any shipping damage. If furnace is damaged, promptly inform dealer where you bought furnace.
PRODUCT
FEATURES
HOT SURFACE IGNITOR
This furnace has an electronic ignitor. There is no standing pilot. No matches or batteries are required.
THERMOSTATIC HEAT CONTROL
The thermostat is temperature sensitive. It automatically turns the furnace on and off. This results in the greatest heating comfort. This can also result in lower gas bills.
LIMIT SWITCH
The limit switch shuts off the gas to the main burner if the furnace becomes too hot to operate safely.
SPECIFICATIONS
|
25,000 Btu/Hr |
40,000 Btu/Hr |
*Rated Heating Input (BTU/Hr) |
25,000 |
40,000 |
Thermal Output Capacity |
|
|
(average loss calculation) |
18,750 Btu/Hr |
30,000 Btu/Hr |
Type Gas |
Natural Only |
Natural Only |
Ignition |
Hot Surface Ignitor |
Hot Surface Ignitor |
Operating Amps |
1.5 |
2 |
Volts/Cycles |
120/60 |
120/60 |
Main Burner |
1 |
2 |
Pressure Regulator Setting |
3.5" W.C. |
3.5" W.C. |
Inlet Connection |
3/8 NPT |
3/8 NPT |
Inlet Gas Pressure (in. of water)* |
|
|
Maximum |
7" |
7" |
Minimum |
5" |
5" |
Dimensions, Inches (H x W x D) |
|
|
Furnace |
15 3/32 x 16 1/8 x 23 5/8 |
15 3/32 x 21 3/4 x 23 5/8 |
Weight (pounds) |
|
|
Furnace |
53 |
71 |
Shipping |
65 |
98 |
* For purposes of input adjustment.
201842 |
3 |
THE COMFORT PRODUCTS PEOPLE
DIRECT-VENT NATURAL GAS HEATER
INSTALLATION
Mounting hardware needed to mount furnace into wall is included with the furnace. No venting material is needed. You must furnish tools and all gas piping from the gas source to the furnace inlet.
WARNING: A qualified service person must install furnace. Have service person inspect furnace before use and at least annually. Follow all local codes.
NOTICE: This furnace must be electrically grounded. Follow all local codes. In the absence of local codes, follow the National Electric Code, ANS/NFPA 70 (U.S.) or Canadian Electrical Code Part I-CSA C22.1 (Canada).
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural gas, do not install furnace. Call dealer where you bought furnace for proper type furnace.
INSTALLATION ITEMS
Before installing furnace, make sure you have all items below:
•electric drill
•drill bits
•Phillips screwdriver
•hammer
•pipe wrench
•stud locator or small finishing nails
•equipment shutoff valve (supplied)
•test gauge connection (see Figure 15, page 10)
•piping (check local codes)
•sealant (resistant to propane/LP gas)
•ground joint union
•sediment trap
•tee joint
LOCATING FURNACE
This furnace is designed to be mounted in a wall that is 4 to 18 inches thick. You can also mount furnace in a window.
WARNING: Do not install furnaceininteriorwallofbuilding.You must install furnace in exterior wall of building. Rear of furnace must extend into open, outside air. This lets poisonous exhaust gases ventilate to the outdoors.
WARNING: Turn off electrical circuits that pass through the wall where you are going to install the furnace.
WARNING: Maintain the minimum clearances shown in Figure 1. If you can, provide greater clearances from floor, ceiling, and joining wall.
WARNING: Due to high temperatures,neverinstallthefurnace:
•in an inside wall
•in a recreation vehicle
•in a window recessed in a thick wall (creating an alcove)
•in an alcove
•behind a door or where an open doorwouldblocknormalairflow
•as a fireplace insert
•in high traffic areas
•near furniture or draperies
•in windy or drafty areas
CAUTION: If you install the furnace in a home garage, locate furnace where moving vehicle will not hit it.
Forconvenienceandefficiency,installfurnace:
•where there is easy access for operation, inspection, and service
•in a central location, near an electrical outlet
•where there is adequate clearance around vents outside
Before installing furnace, inspect the wall, floor, and outside areas. Make sure there are no pipes, wiring, or anything else that would interfere with furnace installation. If you are installing thermostat in a wall, make sure there are no pipes or wiring in the hollow wall above the furnace. The thermostat wires will pass through this wall from the attic.
Minimum Clearances
Provide the following minimum clearances from furnace front cover to combustibles (as viewed from the front of furnace, see Figure 1):
Below Front Cover: 6 inches
Above Front Cover: 12 inches
Adjoining Wall: 12 inches
Front: 8 feet
Ceiling
12" Minimum
12" Minimum
Adjacent
Side Wall
6" Minimum
Finished Floor, Carpet, Tile, etc.
Figure 1 - Mounting Clearances as Viewed from Front of Furnace
The clearance between the cabinet and the wall it passes through is 0 inches.
Provide the following minimum clearances from furnace cabinet (portion of cabinet extending into outside air, as viewed from the rear of furnace) to obstructions:
Cabinet Back: 36 inches
Cabinet Sides: 6 inches
Cabinet Bottom: Must be high enough off the ground to prevent snow, water, leaves, or any other objects from blocking vents.
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201842 |
OWNER’S MANUAL
INSTALLATION
(Continued)
CREATING WALL OPENING AND MOUNTING FURNACE
Remove furnace front cover. Remove the two screws at the lower edges of front cover. Lift front cover away.
Installing in Normal Frame Wall
The 25,000 BTU/Hr model is designed to fit between two wall studs set at 16 inch on center. The 40,000 BTU/Hr model will not fit between wall studs. Follow the steps below to install.
1.Turn off electrical circuits that pass through mounting wall. Make sure there are no pipes or electrical wires in area you intend to cut.
2.Use stud locator or small finishing nail to find wall studs. When you locate studs, drive a small finishing nail into each stud. This provides a visual reference for stud locations.
3.25,000 BTU/Hr Model: Cut an opening in wall between the two studs. Make opening 14 1/4" wide by 13 5/8" high (see Figure 2). IMPORTANT: You must install furnace horizontally. Do not install furnace vertically.
40,000 BTU/Hr Model: Cut a 20 5/16" wide by 14 3/8" high opening in wall (see Figure 2). Start your cut right next to stud you are going to anchor cabinet to. Cut across wall and through the next stud. Stop cut at proper width. IMPORTANT: You must install furnace horizontally. Do not install furnace vertically.
4.25,000 BTU/Hr Model: Mark screw locations on wall (see Figure 2). Make sure screws will anchor into studs. Make sure screw locations match screw holes on cabinet flange.
40,000 BTU/Hr Model: Mark screw locations on wall (see Figure 2). Make sure screws on one side will anchor into studs. Screws on other side will only anchor in wall material. Make sure screw locations match screw holes on cabinet flange.
5.25,000 BTU/Hr Model: Use a propersized drill bit. Drill holes through wall and into studs at marked locations.
40,000 BTU/Hr Model: Use a propersized drill bit. On wall stud side of opening, drill holes through wall and into studs at marked locations. On other side, drill holes through wall material.
6.Insert furnace into opening. Do this from inside the room. Secure furnace to wall with four large screws provided.
7.On outside of wall, caulk opening between the cabinet and the rough edges of opening.
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Wall Studs |
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14 1/4" |
Approx. |
Approx. |
13 |
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Screw |
Screw |
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Locations |
/5 |
Locations |
"8 |
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Wall |
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Opening |
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25,000 BTU/Hr Model |
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Wall Studs |
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Approx. |
20 5/16" |
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14 |
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Screw |
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Locations |
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/3 |
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"8 |
Wall Opening
40,000 BTU/Hr Model
Figure 2 - Wall Openings and Screw
Locations
Installing in Masonry Wall
You can mount both models in a masonry wall. Follow the steps below to install.
1.Cut opening in wall. Make opening 14 1/4" wide by 13 5/8" high for 25,000 BTU/Hr models. Make opening 20 5/16" wide by 14 3/8" high for 40,000 BTU/Hr models. IMPORTANT: You must install furnace horizontally. Do not install furnace vertically.
2.Secure furnace to wall with toggle bolts or hook bolts set in mortar.
3.Insert furnace into opening. Do this from inside the room. Secure furnace to wall with toggle bolts or hook bolts.
4.On outside of wall, caulk opening between the cabinet and the rough edges of opening. You can also use mortar to seal opening.
INSTALLING THERMOSTAT
WARNING: Unplug furnace before installing thermostat.
Mount the thermostat directly on the furnace or on a wall in another part of the room. If you have solid or masonry walls, mount the thermostat on the furnace.
Mounting Thermostat to Furnace
1.Unplug furnace.
2.Locate red and white thermostat wires coming out of side of furnace. These wires are labeled “Thermostat.”
3.Cut thermostat wires to desired length.
4.Route thermostat wires through slot/ hole in side of thermostat mounting plate. Then route wires through 5/8" diameter hole in center of plate (see Figure 4, page 6).
5.Connect thermostat wires to the two terminal screws on back of thermostat (see Figure 3). Connect red wire to “R” terminal. Connect white wire to “W” terminal.
White Wire
W
R
Red Wire
Figure 3 - Connecting Thermostat Wires to Thermostat
Continued
201842 |
5 |
THE COMFORT PRODUCTS PEOPLE
DIRECT-VENT NATURAL GAS HEATER
INSTALLATION
(Continued)
6.Attach thermostat to thermostat mounting plate with screws provided (see Figure 4). IMPORTANT: Note mounting plate position in Figure 4. Correctly position mounting plate for your model furnace.
7.Insert thermostat mounting plate between wall and cabinet flange. Line up top notch on mounting plate with top screw on flange (see Figure 5). IMPORTANT: Thermostat for 25,000 BTU/Hr model mounts on right side of furnace (see Figure 5). Thermostat for 40,000 BTU/Hr model mounts on left side of furnace (see Figure 5).
8.Insert screw in cabinet flange and thermostat mounting plate and tighten firmly.
IMPORTANT: Make sure thermostat wires do not touch combustion chamber.
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40,000 BTU/Hr Models |
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Figure 4 - Attaching Thermostat to Thermostat Mounting Plate
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40,000 BTU/Hr Models
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25,000 BTU/Hr Models
Figure 5 - Inserting Thermostat Mounting
Plate Between Wall and Cabinet Flange
Locating Thermostat on Wall
1.Locate thermostat 4 1/2 to 5 feet above the floor on an inside wall away from any heat sources. The thermostat needs to sense average room temperature. Avoid the following:
HOT SPOTS
Concealed pipes or ducts Fireplaces
Registers
TV sets and radios Lamps or direct sunlight Kitchen
COLD SPOTS
Concealed pipes or ducts Stairwells (drafts) or doors (drafts)
Unheated rooms on other side of wall
DEAD SPOTS
Behind doors Corners and alcoves
2.Before installing thermostat, inspect the wall, floor, and attic areas. Make sure there are no pipes, wiring, or anything else that would interfere with installing thermostat. Do not mount thermostat to stud. If there are any obstructions, choose a new location.
3.Provide two 18-gauge insulated stranded wires for the thermostat wire. Also provide two wire nuts, and two wall anchors. There is a red and a white thermostat wire coming from the furnace. The extra thermostat wires you furnish attach to these wires. Make sure you furnish a red and a white wire. This will insure correct hookup. Purchase enough thermostat wire to go from the furnace to the thermostat location. Do not cut and splice this wire. The thermostat wire must be unbroken.
Routing Thermostat Cable
All wiring must meet local codes. The following instructions cover routing the wire through the attic. You can run wiring from a basement or crawl space.
1.Unplug furnace.
2.Before drilling hole in wall, drive a small finishing nail through ceiling directly above thermostat location. Pull nail out and push a small stiff wire through hole. This helps you locate thermostat mounting location when in attic.
3.In attic, locate stiff wire. Drill 1/2" hole in center of ceiling wall plate next to stiff wire. Remove wire.
4.Probe through drilled hole in wall plate with a stiff wire to make sure there are no pipes, wiring, or anything else blocking the way for thermostat wires. If you find blockage, choose new location for thermostat.
5.Drill a 1/2" hole through the wall at thermostat mounting location.
6.From attic, feed thermostat wires through hole in ceiling plate until wires reach thermostat location.
7.Make a small hook with a piece of stiff wire. Run wire hook through 1/2" hole in wall. Hook thermostat wires. Pull wires through hole in wall. Make sure 6" of wires stick out.
8.Drive a small finishing nail in ceiling above furnace.
25,000 BTU/Hr Model - Drive nail above right side of furnace.
40,000 BTU/Hr Model - Drive nail above left side of furnace. Pull nail out and push a small stiff wire through hole. This helps you locate wire routing location when in attic.
9.Repeat steps 3 and 4 above.
6 |
201842 |
OWNER’S MANUAL
INSTALLATION
(Continued)
10.Feed thermostat wires from attic to furnace through 1/2" hole in ceiling wall plate.
11.Connect thermostat wires from attic to thermostat wires on furnace. Connect red wires together, then connect white wires together. Use wire nuts to make connections. IMPORTANT: Make sure thermostat wires do not touch combustion chamber.
Mounting the Thermostat to Wall
1.Connect thermostat wires to the two terminal screws on back of thermostat (see Figure 6). Connect red wire to “R” terminal. Connect white wire to “W” terminal.
2.Push any excess wire back through hole in wall and plug hole with insulation to prevent drafts. Drafts affect the thermostat operation.
3.Use thermostat base to mark mounting screw locations.
4.Drill proper-sized holes for wall anchors.
5.Attach thermostat to wall using screws provided (see Figure 7).
White Wire
W
R
Red Wire
Wall
Anchors
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Figure 7 - Mounting Thermostat to Wall
CONNECTING TO GAS SUPPLY
WARNING: A qualified service person must connect furnace to gas supply. Follow all local codes.
WARNING: Never connect furnace to private (non-utility) gas wells. This gas is commonly known as wellhead gas.
WARNING: Unplug furnace before connecting to gas supply.
CAUTION: Use only new, black iron or steel pipe. Copper tubing may be acceptable in certain areas. Check local codes. Use pipe large enough in diameter to allow proper gas volume to furnace. If pipe is too small, undue loss of pressure will occur. Refer to chart on page 9.
All piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANS Z223.1 NFPA No. 54), whichever applies.
You can connect furnace to gas supply at front of furnace (inside) or at rear of furnace (outside).
Connecting Furnace to Gas Supply at Front of Furnace
1.Locate gas inlet pipe on lower, right front of furnace (see Figure 8).
2.Connect 3/8" NPT pipe or nipple to gas inlet pipe (see Figure 8). See Providing Gas Piping to Furnace, pages 9 and 10, for correct gas pipe installation.
Gas Inlet Pipe
3/8" NPT Pipe or Nipple
Figure 8 - Connecting Gas from Inside of Room
Figure 6 - Connecting Thermostat Wires to Thermostat
CAUTION: Lightly apply pipe joint sealant to male threads before connecting. Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
Continued
201842 |
7 |
THE COMFORT PRODUCTS PEOPLE
DIRECT-VENT NATURAL GAS HEATER
INSTALLATION
(Continued)
Connecting Furnace to Gas Supply at Rear of Furnace
1.Remove the two screws in back of furnace cabinet located by the exhaust vent(s) (see Figures 9 and 10).
2.Remove two screws on front lower flange that attach furnace flange to furnace cabinet flange (see Figure 11). Note: 40,000 BTU/Hr model has a bottom shield (see parts list, page 22, for location). Removing two screws will detach bottom shield.
3.Slide furnace out of furnace cabinet.
4.Locate gas inlet pipe on lower, right front of furnace.
5.40,000 BTU/Hr Model Only: Remove screw holding gas inlet pipe clamp to furnace.
6.Disconnect gas inlet pipe from 3/8" manifold elbow. Turn gas inlet pipe counterclockwise to disconnect (see Figure 12).
7.Rotate the 3/8" manifold elbow 90° so the opening is pointing downward (see Figure 12).
8.Locate knockout plug in furnace cabinet. Knockout plug is in lower left rear of furnace cabinet (as viewed from rear, see Figure 13). Remove knockout plug.
9.Slide furnace back into furnace cabinet. Make sure exhaust tube gaskets are in place. Make sure exhaust and intake vent tubes extend into vent caps on back of cabinet. Replace two screws by exhaust vent(s) removed in step 1.
10.25,000 BTU/Hr Model: Replace two screws removed in step 2. Attach furnace flange and furnace cabinet lower flange together.
40,000 BTU/Hr Model: Place bottom shield back in place. Replace two screws removed in step 2. Attach bottom shield, furnace flange, and furnace cabinet lower flange together.
11.Run 3/8" pipe or nipple through knockout hole. Connect 3/8" pipe or nipple to manifold elbow (see Figure 14). See
Providing Gas Piping to Furnace, pages 9 and 10 for correct gas pipe installation.
12.Check connections for gas leak.
WARNING: Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once.
13.Caulk around pipe or nipple. This prevents cold air entering knockout hole.
Figure 9 - Locations of Screws in Back of Furnace Cabinet (25,000 BTU/Hr Model)
Figure 10 - Locations of Screws in Back of Furnace Cabinet (40,000 BTU/Hr Model)
Furnace
Furnace Flange
Cabinet
Flange
Figure 11 - Removing Screws on Lower Flange (40,000 BTU/Hr Model Shown)
Remove Screw,
40,000 BTU/Hr
Model Only
Gas Inlet
Pipe
Manifold Elbow
Figure 12 - Disconnecting Gas Inlet Pipe
(40,000 BTU/Hr Model Shown)
Knockout Plug
Figure 13 - Location of Knockout Plug
3/8" NPT
Figure 14 - Inserting Pipe through Knockout Hole
8 |
201842 |
OWNER’S MANUAL
INSTALLATION
(Continued)
Providing Gas Piping to Furnace
You must provide gas piping from gas source to furnace. The gas piping must be in a vertical position where it connects to the furnace. This prevents interference with front cover installation.
Consult your local gas company for proper routing of the gas lines.
Pipe size is determined by the length of pipe from the gas source to the furnace and the total
BTU load on the gas source.
Add the total BTUs required for all appliances connected to the gas source including this furnace.
Divide this number by 1030. This will give you the approximate cubic feet per hour needed.
Example:
40,000 BTU/Hr
+15,000 BTU/Hr for other gas appliances
55,000 BTU/Hr total
55,000 ÷ 1030 = 53.4
Locate 53.4 or higher on chart below.
According to the chart below, you should use 50 feet or less of 1/2" pipe, 200 feet or less of 3/4" pipe, etc...
MINIMUM |
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IRON PIPE |
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SIZE |
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LENGTH OF PIPE (FEET) |
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10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
125 |
150 |
175 |
200 |
3/8" |
72 |
49 |
40 |
34 |
30 |
27 |
25 |
23 |
22 |
21 |
18 |
17 |
15 |
14 |
1/2" |
132 |
92 |
73 |
63 |
56 |
50 |
46 |
43 |
40 |
38 |
34 |
31 |
28 |
26 |
3/4" |
278 |
190 |
152 |
130 |
115 |
105 |
96 |
90 |
84 |
79 |
72 |
64 |
59 |
55 |
1" |
520 |
350 |
285 |
245 |
215 |
195 |
180 |
170 |
160 |
150 |
130 |
120 |
110 |
100 |
11/4" |
1050 |
730 |
590 |
500 |
440 |
400 |
370 |
350 |
320 |
305 |
275 |
250 |
225 |
210 |
11/2" |
1600 |
1100 |
890 |
760 |
670 |
610 |
560 |
530 |
490 |
460 |
410 |
380 |
350 |
320 |
2" |
3050 |
2100 |
1650 |
1450 |
1270 |
1150 |
1050 |
990 |
930 |
870 |
780 |
710 |
650 |
610 |
21/2" |
4800 |
3300 |
2700 |
2300 |
2000 |
1850 |
1700 |
1600 |
1500 |
1400 |
1250 |
1130 |
1050 |
980 |
3" |
8500 |
5900 |
4700 |
4100 |
3600 |
3250 |
3000 |
2800 |
2600 |
2500 |
2200 |
2000 |
1850 |
1700 |
4" |
17500 |
12000 |
9700 |
8300 |
7400 |
6800 |
6200 |
5800 |
5400 |
5100 |
4500 |
4100 |
3800 |
3500 |
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IMPORTANT:Check gas line pressure at gas meter before connecting furnace to gas line. Gas line pressure must be no less than 5 inches of water and no greater than 7 inches of water. Gas pressures and input to the burners must not exceed the rated input and pressure shown on the rating plate. For natural gas, manifold pressure should be 3.5 inches of water. For elevations above 2000 feet, reduce rating 4% for each 1000 feet above sea level (U.S.A. only).
Continued
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