ICP GNK050N12A3, GNK075N14A3, GNK100N16A3, NTGM050EFA3, NTGM075EGA3 Installation Guide

...

NTGM/GNK Series Upflow/Horizontal

NCGM/GCK Series Downflow/Horizontal

SAFETY REQUIREMENTS

Recognize safety information. This is the safety-alert symbol _. When you see this symbol on the furnace and in instructions or manuals be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, or CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards, those that will result in severe personal injury or death. WARNING signifies a hazard that could

result in personal injury or death. CAUTION is used to identify unsafe practices that could result in minor personal injury or product and property damage.

Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified person- nel should install, repair, or service heating equipment.

Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags,

and on labels attached to or shipped with the unit and other safety precautions that may apply. Follow all safety codes. In the United States, follow all safety codes including the current edition National Fuel Gas Code (NFGC) NFPA

No. 54/ANStZ223.1. In Canada, refer tothe current edition ofthe National Standard Canada CAN/CGA-B149.1 - and .2-M91 Natural Gas and Propane Installation Codes (NSCNGPIC). Wear safety glasses and work gloves. Have fire extinguisher available during start-

up and adjustment procedures and service calls. These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances,

these instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential

construction practices. We requre these instructions as a minimum for a safe installation.

Design Certified

byAGA

Manufactured by:

International Comfort Products Corporation (USA)

Lewisburg, TN USA 37091

Table of Contents

1.SafeInstallationRequirements................ 2

2.Installation............................... 4

3.Combustion&VentilationAir ................ 9

4.Vent& CombustionAirPiping ................ 11

5.GasSupplyandPiping ...................... 19

6.ElectricalWiring ........................

7.DuctworkandFilter(Upflow/Horizontal)......

8.DuctworkandFilter(Downflow/Horizontal)....

9. ChecksandAdjustments.................

10.FurnaceMaintenance ...................

11.ConcentricVentTermination..............

Fire or Explosion hazard. This furnace is not designed for use in mobile

homes, trailers or recreational vehicles. Such use could result in death, bodily injury

and/or property damage.

LP1 6/9/2000 440 01 1002 01

22 23

25 28

30 30

1.Safe InstallationRequirements

Installation or repairs made by unqualified persons can result in hazards to you and others.

Installation MUST conform with local codes or, in the absence of local codes, with codes of all governmental authorities having jurisdiction.

The information contained in this manual is

intended for use by a qualified service technician who is experienced in such work, who is familiar with all precautions and safety procedures

required in such work and is equipped with the

proper tools and test instruments.

Failure to carefully read and follow all instruc- tions in this manual can result in furnace

malfunction, death, personal injury and/or

property damage.

NOTE: This furnace is design certified by the American Gas

Association and the Canadian Gas Association for installation in the United States and Canada. Refer to the appropriate codes,

along with Figure 1 or Figure 2 and this manual, for proper instal- lation.

• This furnace is NOT approved for installation in mobile

homes, trailers or recreation vehicles.

Do NOT use this furnace as aconstruction heater or to heat a building that is under construction.

Use only the Type of gas approved for this furnace (see Rating Plate on unit). Overfiring will result in failure of heat exchanger and cause dangerous operation. (Furnaces can be converted to L.P. gas with approved kit.)

• Do NOT use open flame to test for gas leak.

• Ensure adequate combustion and ventilation air is pro- vided to the furnace.

• Seal supply and return air ducts.

• The vent system MUST be checked to determine that it is the correct type and size.

• Install correct filter type and size.

• Unit MUST be installed so electrical components are pro- tected from direct contact with water.

NOTE: It is the personal responsibility and obligation of the end user to contact a qualified installer to ensu rethat the installation is

adequate and conforms to governing codes and ordinances.

SafetyRules

Your unit 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 unit and

create hazards for you, the owner.

A. The U.S. Consumer Product Safety Commission recom-

mends that users of gas-burning appliances install carbon monoxide detectors. There can be various sources of car-

bon 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 seri-

ous bodily injury and/or death. Therefore, to help alert people of potentially dangerous carbon monoxide levels,

you should have carbon monoxide detectors listed by a na- tionally recognized agency (e.g. Underwriters Laboratories or International Approval Services) installed and main-

tained in the building or dwelling (see Note below).

B. There can be numerous sources of fire or smoke in a build-

ing or dwelling. Fire or smoke can cause serious bodily inju- ry, death, and/or property damage. Therefore, in order to

alert people of potentially dangerous fire or smoke, you should have fire and smoke detectors listed by Underwrit-

ers Laboratories installed and maintained in the building or dwelling (see Note below).

Note: The manufacturer of your furnace does not test any de-

tectors and makes no representations regarding any brand or type of detector.

C. To ensure safe and efficient operation of your unit, you

should do the the following:

1. Thoroughly read this manual and labels on the unit. This will help you understand how your unit operates and the hazards involved with gas and electricity.

2. Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect

the unit and to replace any part of the control system and any gas control which has been under water.

3. Never obstruct the vent grilles, or any ducts that pro-

vide air to the unit. Air must be provided for proper com-

bustion and ventilation of flue gases. 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.

FreezingTemperaturesandYourStructure

Freeze warning.

Turn off water system.

If your unit remains shut off during cold weather

the water pipes could freeze and burst, resulting

in serious water damage.

Your unit is equipped with safety devices that may keep itfrom op- erating if sensors detect abnormal conditions such as clogged ex-

haust flues. Ifthe structure will be unattended during cold weather you should

take these precautions.

1. Turn off main supply water into the structure and drain the water lines if possible. Open faucets in appropriate areas.

2. Have someone check the structure frequently during cold weather to make sure it is warm enough to prevent pipes

from freezing. Suggest they call qualified service agency, if required.

[_ 44001 100201

Dealer Name:

START-UP CHECK SHEET

(Keep this page for future reference)

Address:

City, State(Province), Zip or Postal Code:

Phone: Owner Name:

Address:

City, State(Province), Zip or Postal Code:

Model Number:

Serial Number:

Type of Gas:

Blower Motor H.P.:

Supply Voltage:

Limit Opens at...(°F) or(°C)

Natural: _1 LP: _1

Business Card Here

Drip-Leg Upstream of Gas Valve?

Condensate Drain Connected? YES _1

Condensate Drain Trapped? YES _1

Horizontal Condensate Switch Installed? YES _1 NO _1

Blower Speed Checked? YES _1 NO _1

All Electrical Connections Tight? YES _1 NO _1

Gas Valve OK? YES _1 NO _1

Measured Line Pressure When Firing Unit:

YES _1 NO _1

NO_1

Noel

Limit Closes at._(°F) or(°C)

Which blower speed tap is used? (Heating) (Cooling)

Temperature of Supply Air: (°F) or(°C)

Temperature of Return Air: (°F) or(°C)

Rise (Supply Temp.-Return Temp.): (°F) or(°C)

Filter Type and Size:

Fan "Time ON" Setting:

Fan "Time OFF" Setting:

Manual Gas Shut-Off Upstream of Furnace/Drip-Leg? YES _1 NO _1

Dealer Comments:

Calculated Firing Rate: (See Checks and Adjustments Sec-

tion).

Measured Manifold Pressure:

Thermostat OK? YES _1

Subbase Level? YES _1

Anticipator Set? YES _1

Breaker On? YES _1

Date of Installation:

Date of Start-Up:

NOel

NO[_I

NO _1 Set At?:

NO_1

440 01 100201 [_

2. Installation

Poison carbon monoxide gas Hazard.

This furnace can NOT be common vented or connected to any type B, BW or L vent or vent

connector, nor to any portion of a factory-built or

masonry chimney. If this furnace is replacing a previously common-vented furnace, it may be

necessary to resize the existing vent line and chimney to prevent oversizing problems for the other remaining appliance(s). See Venting and

Combustion Air Check in Gas Vent Installation section. This furnace MUST be vented to the outside,

Failure to properly vent this furnace or other appliances can result in death, personal injury and/or property damage.

*8" (200ram)Min. 20' (6m)Max. in sameatmosphericzone

Typical Upflow Installation

Aluminumor non-rusting shieldrecommended.

(SeeVentTerminationShieldin fordimensions).

exhaustpipe.Total pipe& couplingout-

sidestructure=8"

;ouplingon_nds of

'8" (200ram)Min. 20' (6m)Max.

insameatmosphericzone

DualCertifiedFurnace

The"NCGM", "GCK","NTGM"and"GCK"furnacesare dual certi-

fied. Thismeansthatthe INLET pipe isoptional.See Figure 1 or

Figure 2 for identificationof INLET and OUTLETpipe. Combus-

tion aircan bedrawnfrom outside thestructureorinsidethe struc- ture. Ifdrawingcombustion airfrom insidethe structure, adequate

make up air MUST be provided to compensate for oxygen burned. See Confined Space Installation in the Combustion

and Ventilation Air chapter.

Locationand Clearances

1. Refer to Figure 1or Figure 2 for typical installation and ba- sic connecting parts required. Refer to Figure5 or

Figure 6 for typical horizontal direct vent installation and basic connecting parts required. Supply and return air ple-

nums and duct are also required.

2. If furnace is a replacement, it is usually best to install the furnace where the old one was. Choose the location or

evaluate the existing location based upon the minimum clearance and furnace dimensions (Figure 3 or Figure 4).

CAUTION

Special precautions MUST be made if installing furnace in an area which may drop below freezing. This

can cause improper operation or damage to equipment. If furnace environment has the potential of freezing, the drain trap and drainline must be protected. The use of electric heat tape or RV

antifreeze is recommended for these installations. (See "Condensate Trap Freeze Protection Section ")

Do NOT operate furnace in a corrosive atmosphere containing chlorine, fluorine or any other damaging

chemicals. Refer to Combustion & Ventilation Air

section, Contaminated Combustion Air.

25-20-70

* Increaseminimumfrom8" to 18" forcoldclimates(sustainedtemperaturesbelow 0 ° F).

Typical Downflow Installation

See VentTermination

Shielding inVent _ction.

*8" (200mm) Min._ _ 20' (6m)Max. _> ___ InletPip

Zoiqe

in same atmospheric _ Optional\

supportedHorizontally andVertically

Couplingon inside

_re d outsideof wall

strainventpipe

"8"(200mm)Min.

/ 20' (6m)Max.

insameatmospheric

zone

Teeto preventairlock

CondensateNeutralizer

(Onlyifrequired)

*Increaseminimumfrom8"to18"forcoldclimates(sustainedtemperatures

belowO°F}.

[_ 44001 100201

iiiiiii!!i!liiiii/l;i!iiiii/!iiiiiiii!liil;iii/iiiiiiiiii'ii!iii!!///!i

!! !!!!OimensionsandC,earances,orUp.owFurnace

__ Back Cabinet to

Drain TOPIBOT"I

Connection 1 ' 0'

"""'-_ 718 (22) _' _ 25-20-65

Combustible Clearances

i I'C IF= TI 'OE0' 0' 0' 3' 0"

Unit

Capacity

50,000 75,000

100,000 125,000

Unit

Capacity

50,000

75,000 100,000 125,000

turnEquivalents 48" = (1219) 191/8" = (486) 228/4"= (578) 263/8" = (670) 281/2"= (724) 11/2"= (38) 15/8" = (41) 21/2"= (64)

41/2"= (114) t75/16" = (440) 181/2"= (470) 175/8"= (448) 211/4"=(540) 247/8"= (632) 247t8" = (632) 231/8" =(587) t43/4" = (375)

t83/4" = (476) 231/2"=(597) 221/2" = (572) 141/2" = (368) 321/2"= (825) 237/8"= (606) 261/16"=(662) 107/8" = (276) 23/4" = (70)

61/2" = (165) 211/16"=(68) 4131_6"= (122) 127/8" = (327) 1411/16"= (373) 18" = (457) 2_1/16"= (68) 21/8" = (54) 17/8"= (48)

t7/16" = (37)

Cabinet

48 191t8 281_ 48 19118 281_

48 223/4 281_ 48 26_8 281_

GasConnections

RightSide LeftSide

N P N P R

321/2 237t8 321/2 261/16 107/8 321/2 237/8 321/2 261/16 107/8

321/2 237t8 321/2 261/16 107/8 321/2 237t8 321/2 261/16 107/8

Top LeftSide LowVolt

D E D E F G

11/2 11/2 t5/8 21/2 41/2 17_16 11/2 11/2 t5/8 21/2 41/2 17_16

11/2 11/2 t5/8 21/2 41/2 17_16 11/2 11/2 t518 21/2 41/2 17_16

ElectricalConnections

DrainConnections

RightSide LeftSide

S S

23/4 61t2 23/4 61/2

23/4 61/2 23/4 61/2

ALL DIMENSIONS IN INCHES (MM)

SupplyAir

H I

18112 175/8 181/2 175/8

181/2 211/4 181/2 247/8

SupplyAir

T V

211116 413/16 211/16 413/16

211/16 413/16 211/16 413/16

J K L

231/8 143/4 221/2 t41t2 231f8 143/4 221/2 t41/2

231/8 183/4 221/2 t41t2 231/8 231/2 221/2 t41t2

ReturnAir

Bottom Side

ReturnAir

Bottom

W Y Z

127/8 211/16 21/8 127/8 211/16 21/8

t411116 211/16 17/8

18 211/16 17/16

440 01 100201 [_

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Dimensions and Clearances for Downflow

¥ v

Cabinet to Combustible Clearances

TOP BOT. RH LH BACK FRNT FLUE

0" 0"* 0" 0" 0" 3" O"

* Can not be installed directly on combustible flooring.

Supp _'plenum must have 1" clearance for first 6' from furnace.

_ 33/4

c B/

25-21-83 _"/

Unit

Capacity

50,000 75,000

100,000 125,000

Unit

Capacity

50,000 75,000

100,000 125,000

ram Equivalents 48" = (1219) 191/8" = (486) 223/4" = (578) 263/8" = (670) 281/2" = (724) 11/2" = (38) 15/8" = (41) 21/2" = (64)

41/2" = (114) t75/16" = (440) 181/2" = (470) 175/8" = (448) 211/4" =(540) 247/8" = (632) 247t8" = (632) 23118" = (587) t43/4 " = (375)

t83/4" = (476) 231/2" = (597) 221/2" = (572) 141/2" = (368) 321/2 ', = (825) 237/8" = (606) 261/16" = (662) 107/8" = (276) 23/4" = (70)

61/2" = (165) 211/16" = (68) 413/16" = (122) 127/8" = (327) 1411116"= (373) 18" = (457) 211t16" = (68) 21/8" = (54) 17/8" = (48)

t7/16" = (37)

Cabinet

A B C

48 191/8 28112 48 191/8 28112 48 223/4 28112

48 263/8 28112

Gas Connections

Right Side LeftSide

M N M N

163/8 193/8 163/8 t93/8 163/8 193/8 163/8 t93/8 163/8 193/8 163/8 t93/8

163/8 193/8 163/8 t93/8

D E D E F G

11/2 11/2 1 5/8 2 1/2 3 3/4 341/2 1 1/2 1 1/2 1 5/8 2 1/2 3 3/4 34 1/2 1 1/2 1 1/2 1 5/8 2 1/2 3 3/4 34 1/2

1 1/2 1 1/2 1 5/8 2 1/2 3 3/4 34 1/2

Top LeftSide LowVolt

ElectricalConnections

DrainConnections

RightSide LeftSide

R S L P R S

13 61& 25 _18 24 13 61& 13 61& 25 _18 24 13 61& 13 61_ 25 _16 24 13 61_

13 61_ 25 _16 24 13 61_

ALL DIMENSIONS IN INCHES (MM)

ReturnAir

Top

H I J

181/2 175/8 17 181/2 175/8 17 181/2 21 1/4 17

181/2 247/8 17

FlueOutlet

T 3

53/16

SupplyAir

Bottom

K Z

t75_ 3_ t75_ 3_

2216 3_ 247_ 3_

AirInlet

1213/16 1213/16

3 13/16 3 13/16 3 13/16

3 13/16

InstallationRequirements

1. Install furnace level.

2. This furnace is NOT to be used for temporary heat of build-

For downflow installations, non combustible subbase must be used under the furnace unless installation is on a non

combustible floor surface. This requirement applies even

when a coil box or cabinet is used.

ings or structures under construction.

3. Install furnace as centralized as practical with respect to the heat distribution system.

4. Install the vent pipes as short as practical. (See Vent and

Combustion Air Piping section).

5. Maintain clearance for fire safety and servicing. A front

clearance of 30" (762mm) is recommended for access to the burner, controls and filter.

6. Use a raised base for upflow furnace if the floor is damp or

Fire Hazard. Place furnace on noncombustible cement board

or sheet metal on downflow applications. Failure to install unit on noncombustible cement

board or sheet metal can result in death, personal injury and/or property damage.

wet at times.

[_ 44001100201

8. For horizontal installations, line contact is permissible only between lines formed by intersection of back and two sides

of furnace jacket, and building joists, studs or framing.

9. Residential garage installations require:

• Burners and ignition sources installed at least 18" (457mm) above the floor.

• Located or physically protected from possible damage by a vehicle.

10. Local codes may require a drain pan under the entire fur- nace and condensate trap when the furnace is installed in

attic application.

HorizontalFurnaceInstallation

Typical Horizontal Installation

(NCGM/GCK)

Inlet Pipe (Optional)

Vent Pipe

Fire, Explosion, and/or Poison carbon monoxide gas Hazard.

Make certain model installed is certified for use in multiple configurations.

Failure to install unit in configuration for which it is certified can result in death, personal injury and/or property damage.

NOTE: Inspect unit rating plate to be certain model number be-

gins with "NTGM", GNK" "NCGM" or "GCK'. This identifies unit as horizontally mountable. Ifunit does NOT bear this designation, you may NOT mount this unit horizontally. Unit may not be

mounted on its back. If you purchased a horizontally mountable furnace, it can be

installed horizontally in an attic, basement, crawl space, alcove, or suspended from a ceiling in a basement or utility room in only a right-to-left (NTGM/GNK) or left-to-right (NCGM/GCK) air-

flow position. See Figure 5 or Figure 6. Do not install furnace on

its back or in the reverse airflow positions as safety control opera-

tion will be adversely affected.

Typical Horizontal Installation

(NTGM/GNK)

Inlet Pipe

Vent

Pipe

Condensate

Trap (field

supplied)

Condensate Trap (field

supplied) NOTE: 5" bottom clearance required for condensate trap.

If the furnace is to be suspended from the floor joists in a crawl space or the rafters in an attic, it is necessary to use steel pipe

straps or an angle iron frame to ridgely attach the furnace to pre- vent movement. These straps should be attached to the furnace with sheet metal screws and to the rafters or joists with bolts. The

preferred method is to use an angle iron frame bolted to the rafters

or joists. (Take caution to allow door panels to be removed for

maintenance)

If the furnace is to be installed in a crawl space, consult local

codes. A suitable concrete pad or blocks are recommended for

crawl space installation on the ground.

NOTE: 5" bottom clearance required for condensate trap.

Thirty (30) inches(760mm) between the front of the furnace and

adjacent construction or other appliances MUST be maintained for service clearance.

Keep all insulating materials clear from Iouvered door. Insulating

materials may be combustible.

The horizontal furnaces may be installed directly on combustible wood flooring or supports as long as all required furnace clear-

ances are met. See Figure 3.

This furnace MUST NOT be installed directly on carpeting or tile

or other combustible material other than wood flooring or sup-

ports.

For horizontal installation over a finished living space. A field fab-

ricated auxiliary drain pan with drain pipe is recommended to pre- vent damage by overflow due to blocked condensate drain.

25-21-81

BlockedCondensateDrainPressureSwitch

25-21-81 a

NOTE: 5" bottom clearance required for condensate trap.

440 01 100201

(AccessoryKitNAHL001HK)

For horizontal furnace installations, a blocked condensate drain

pressure switch MUST be used. Follow the directions outlined in the kit to properly install the switch into the furnace. See Figure 7

or Figure 8.

Blocked Drain Pressure Switch (Upflow/Horizontal Installation)

Air Pressure Horn.offal Condensate Pressure

Switch Switch

W,res Mal_l_Prov_e_ V_ip_Hiadr_ss

MountingHolesforHorizon- talCondensateSwitch (use

HorizontaJ Condensate

BlockedDrain Pressure Switch(Kit NAHLO01HK)

Air Pressure_

2 screwsprovided)

CondensateDrainTrap

For horizontal furnace installations, the condensate drain trap

MUST be installed below the furnace. See Figure 9 for dimen-

sions of the drain trap and the proper material to be used. The

drain connection to the condensate trap must also be properly

sloped to an open drain. See Section 5 under "Condensate Drain

Trap and Neutralizer".

The condensate drain trap connects to the drain stub on the left

side of the plastic transition. See Figure 7 and Figure 9. Remove the plastic cap and clamp from the drain stub. Use the 90° com-

pression fitting elbow (provided) to connect the drain trap to the

drain stub. Replace the plastic cap and clamp over the remaining

drain stub (upflow drain stub) on the plastic transition.

Condensate Drain Trap

Drain Stub

Drain Fitting

(3/4" PVC to 1/2" CPVC)

from Transition'_.&

25-22-18

/ T ps,ub

RubberHsse (provided)

Blocked Drain ) Pressure Switch

HorizontalDrainTrap

Installation)

Plastic Transition

DRAIN

Drain Trap

OD CPVC

Compression

Fitting

(Supplied)

25-21-84a

Horizontal Drain

Horizontal Condensate Blocked Drain Pressure

Switch (Kit NAHLOO1HK)

[_ 44001 100201

3. Combustion&VentilationAir

Poison carbon monoxide gas Hazard. Use methods described here to provide combustion

and ventilation air. Failure to provide adequate combustion and ven-

tilation air can result in death and/or personal injury.

Ventingand CombustionAir Check

NOTE: The following information is supplied to allow the installer

to make adjustments to the setup of existing appliances, IF

REQUIRED, based on good trade practices, local codes, and good judgement of the installer. Manufacturer does NOT take re-

sponsibility for modifications made to existing equipment. NOTE: If this installation removes an existing furnace from a

venting system serving one or more other appliances, and to

make sure there is adequate combustion air for all appliances, MAKE THE FOLLOWING CHECK.

1. Seal any unused openings in the venting system.

2. Visually inspect the venting system for proper size and hor- izontal pitch to ensure there is no blockage or restriction,

leakage, corrosion or other deficiencies which could cause an unsafe condition.

3. Insofar as is practical, close all doors and windows and all doors between the space inwhich the appliance(s) remain-

ing connected to the venting system are located and other spaces of the building.

4. Turn on clothes dryers and any appliance not connected to the 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 exhaust fan. Close fireplace dampers.

5. Follow the lighting instructions for each appliance being in- spected. Adjust thermostat so appliance(s) will operate continuously.

6. Allow 5 minutes of main burner operation, then check for spillage at the draft hood relief opening of each appliance.

Use the flame of a match or candle (Figure 10).

Vent Check

Vent Pipe ---_t I A/ Draft Hood

Typical Gas

Water Heate_;_l / ] i _ V'_'-

Match

7. After it has been determined that each appliance vents properly, return doors, windows, appliances etc. to their

normal condition.

8. If improper venting is observed, the cause MUST be cor- rected using the appropriate tables in code books of coun- try having jurisdiction.

NOTE: If flame pulls towards draft hood, this indicates sufficient infiltration air.

NOTE: Non direct vent appliances occupying same enclosed space as furnace MUST have enough air for proper combustion

and ventilation. All duct or openings for supplying combustion and

ventilation air must comply with the gas and electrical codes ofthe

country having jurisdiction.

When the installation is complete, check that all appliances have

adequate combustion air and are venting properly. See Venting

And Combustion Air Check in this manual.

Air Openingsand ConnectingDucts

1. Total input rating for all non direct vent gas appliances MUST be considered when determining free area of open-

ings.

2. Connect ducts or openings directly to outside.

3. When screens are used to cover openings, they MUST be no less than 1/4" (6mm) mesh.

4. The minimum dimension of rectangular air ducts MUST NOT be less than 3" (75mm).

5. When sizing grille or louver, use the free area of opening. If free area is NOT stamped or marked on grill or louver, as-

sume a 20% free area for wood and 60% for metal.

ConfinedSpaceInstallation

NOTE: A confined space is defined as an area with less than 50 cubic feet(1.4m 3) per 1,000 BTUH input rating for all gas ap- pliances installed in the area.

Requirements

1. Provide confined space with sufficient air for proper com- bustion and ventilation of flue gases using horizontal or ver- tical ducts or openings.

2. Figure 11 illustrate howto provide combustion and ventila- tion air. A minimum of two permanent openings, one inlet

and one outlet, are required.

3. One opening MUST be within 12" (300mm) of the floor and the second opening within 12" (300mm) of the ceiling.

4. Size openings and ducts per Table 1.

5. Horizontal duct openings require 1" square (25sq. mm) of free area per 2,000 BTUH of combined input for all gas ap-

pliances in area (see Table 1).

6. Vertical duct openings or openings directly to outside re- quire 1" square (6.5mm 3)of free area per 4,000 BTUH for

combined input of all gas appliances in area (see Table 1).

440 01 100201 [_

Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)

This installation NOT approved in Canada

Gas V

- GableVe_

(1)

SoffitVent

GasVent

MinimumOneInletand OneOutletAir Supplyis Required

InletAir OpeningMustbeWithin12"(300mm)offloor OutletAir OpeningMustbeWithin12"(300mm)ofceiling

(1) 1 SquareInch(6cm2) per4000BTUH (2) 1 SquareInch(6cm2) per2000BTUH

Maybe in andCombinationShown

Inlet Air(1

Free Area

MinimumFree AreaRequiredfor EachOpening

BTUH

input HorizontalDuct

Rating (2,000 BTUH)

50,000 25 sq. in.(161cm.2) 75,000 35.5 sq. in.(242cm.2)

100,000 50 sq. in.(323cm.2) 125,000 62.5sq. in.(403cm.2)

150,000 71 sq. in.(484cm.2)

EXAMPLE: Determining Free Area

Appliance 1 Appliance 2 Total Input

100,000 + 30,000 = (130,000 + 4,000) = 32.5 Sq. In. Vertical

Appliance 1 Appliance 2 Total Input

100,000 + 30,000 = (130,000 + 2,000) = 65 Sq. In. Horizontal

One permanent opening, commencing within 12" (30 cm.) of the

top of the enclosure, shall be permitted where the equipment has

clearances of at least 1" (2.5 cm.) from the sides and back and 6" (16 cm.) from the front of the appliance. The opening shall directly

communicate with the outdoors or shall communicate through a

vertical or horizontal duct tothe outdoors or spaces (crawl or attic) that freely communicate with the outdoors, and shall have a mini-

mum free area of:

1 sq. in per 3000 Btu per hr (7cm. 2 per kW) ofthe total input rating of all equipment located in the enclosure, and

Not less than the sum of the areas of all vent connectors in the confined space.

VerticalDuctoropenings Round

to outside Duct

(4,000BTUR) (4,000

12.5sq. in.(81cm.2) 4"

18.75 sq.in.(121cm.2) 5" 25 sq.in.(161cm.2) 6"

31.25 sq.in.(202cm.2) 7"

37.5sq. in.(242cm.2) 7"

(210 cm.2)

(419 cm 2)

BTUH)

GableVent

Air (1)

Inlet Air(1)

Soft, Vent

Inlet

Air (2)

UnconfinedSpaceInstallation

Poison carbon monoxide gas Hazard. Most homes will require additional air.

An unconfined space or homes with tight construc- tion may not have adequate air infiltration for prop-

er combustion and ventilation of flue gases. Failure to supply additional air by means of ventila-

tion grilles or ducts could result in death and/or

personal injury.

An unconfined space is defined as an area having a minimum vol-

ume of 50 cubic feet(1.4m 3) per 1,000 Btuh total in put rating for all gas appliances in area. Refer to Table 2 for minimum area re- quired.

_ _!i ii _iiJUnconfined Space

BTUH Input

Rating Minimum Area in Square Feet

50,000 312(29m2) 78,000 490(46m2)

114,000 712(66m2) 155,000 968(90m2)

EXAMPLE: NOTE:Square feet is based on 8 foot ceilings.

28,000BTUH X 50CubicFt. = 1,400 = 175Sq. Ft.

1,000 8' Ceiling Height

NOTE: Refer to definitions in section titled Unusually Tight

Construction. If any one of the conditions apply, the space MUST be considered confined space regardless of size.

1. Adjoining rooms can be considered part of an unconfined area if there are openings without doors between rooms.

Minimum Area in Square Feet

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