Lennox G32Q4-100, G32Q5-125, G32Q3-100, G32Q3-75, G32Q5-100 User Manual

...

INSTALLATION

LENNOX

_2001 Lennox Industt]e-_ _nc

Dallas Texas USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

INSTRUCTIONS

G32Q SERIES UNITS

GAS UNITS 504,488M _[_2ech nical

11/2001 blications

Supersedes504,382M LithoU.S.A.

ITahi6of_ __te:nts i ::

UnitDimensions ................................ 2

G32Q Parts Arrangement ....................... 3

Requirements.................................. 4

General ....................................... 5

Installation - Setting Equipment .................. 5

Return Air Opening Guidelines ................... 5

Filters & Optional Filter Assembly ................. 6

Duct System ................................... 7

Pipe & Fittings Specifications .................... 7

Vent Piping L_uidelines.......................... 8

Joint Cementing Procedure ...................... 8

Venting Practices ............................... 9

Gas Piping ................................... 15

Electrical ..................................... 16

Unit Start-Up ................................. 21

Heating Sequence of Operation ................. 22

Blower Operation .............................. 22

Gas Pressure Adjustment ...................... 22

High Altitude Information ....................... 23

Other Unit Adjustments ........................ 23

Service ...................................... 24

Repair Parts .................................. 27

Troubleshooting ............................... 27

Start-Up & Performance Checklist . 32

-AWARNING

WHAT TO DO IF YOU SMELL GAS:

Do not store or use gasoline or other

flammable vapors and liquids in the vi-

cinity of this or any other appliance.

Installation and service must be per-

formed by a qualified installer, service

agency or the gas supplier,

11101 504,488M

• Do not by to light any appliance.

• Extinguish any open flames.

• 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.

IIIIIIIIIlHIIIIIIHIIIIIIIIIIIIIIIIII Pagol IIIIHIIIIIIIIllllIIHHItllUlIIHII

1 1116

(41)

(16)'-IP

1 1116 3 5/8

,o-oI

• v 151 ) AIR OUTLET

TOP VIEW

"ql'-- 28 1/2

I I

(724)

ELECTRICA

INLETS_

{BothSides)

91- 4(102)

L _____(EitherSide) J

Lt:;:"ZtJ

Return Air

Knockout (Bottom)

SIDE VIEW

21 3/4

(552)

GAS PIPING

INLET

(Both Sides)

4 (I02) E-IP

(1168)

EXTERNAL

SIDE RETURN

/_R FIL'I1ERK]T

(Either Side

O_onal ,

,lira A_

I I

AIR FLOW

Return Air

Knockout (Bottom)

FRONT VIEW

Model No.

G32Q3-75 16-1/4 413 14.1/8 359 12 305 12 305 2-118 54 7-5/8 194 14 356 12-3/4 324

G32Q3/4-100 G32(_4/5-100 21-1/4 540 19-1/8 486 18 457 18 457 1-5/8 41 10-1/8 257 20 508 18-3/4 476

G32Q4/5-125 26-1/4 667 24-1/8 613 18 457 18 457 4-1/8 105 12-5/8 321 20 508 18-3/4 476

A B C D E F G H

in. I mm in. mm in. mm In, mm In. mm in. mm in. mm in, mm

Page 2

FRESH AIR

INTAKE FITTING

BURNERBOX

ASSEMBLY

PATCH

GLASS FIBER GASKET

HEADER

. BOX

_I (COLLECTORTH__

/ PATCH PLATE WITH

l BARBED FITTING

ROLL-OUT SWITCH

HEAT EXCHANGER

WARM

AND FLAME

DuralokPlus TM

ASSEMBLY

FLUE COLLAR

TOP CAP

CABINET

FLUE

FLAME SIGHT p swrrcH

GLASS

BURNER BOX /

COVER ]3NO-STAGE PRESSURE

GAS VALVE AND SWITCH

BURNER

ACCESS

PANEL

BLOWER

ACCESS

DOOR

TWO-SPEED

COMBUSTION AIR

INDUCER

MANIFOLD (-75 only)

RESSURE-.

HIGH HEAT

AIR

ORIFICE

z-/"

COLD HEADER

(COLLECTOR)

BOX

DOOR INTERLOCK SWITCH

4. SUPPLY

S/" _ BLOWER

CONDENSERCOIL

CONTROL TRANSFORMER

CONTROL VOLTAGE

CIRCUIT BREAKER

TWO-STAGE CONTROL BOARD

LBOARD

AIR

FIGURE 1

Page 3

Lennox G32Q units are CSA International certified to ANSI Z21.47 and CSA 2.3 standards.

In the USA, installation of Lennox gas central furnaces must conform with local building codes. In the absence of local codes, units must be installed according to the cur-

rent National Fuel Gas Code (ANSI-Z223.1) in the United States. The National Fuel Gas Code is available from the

following address:

Amedcan National Standards Institute, Inc.

11 West 42rid Street New York, NY 10036

In Canada, installation must conform with current Nation-

al Standard of Canada CAN/CGA-B149.1 "Installation Code for Natural Gas Burning Appliances and Equip-

ment" and CAN/CGA-B149.2 "Installation Code for Pro- pane Gas Burning Appliances and Equipment," local

plumbing or waste water codes and other applicable local

codes. This furnace is CSA International certified for installation

clearances to combustible matedal as listed on the unit

rating plate and in table 1.

TABLE 1

Clearances Location

Front

Service access

To combustible

materials Side, rear,and front

Condensate side

Top

Exhaust

Floor

Inches(mrn)

24 (610)

3(76)

(fromsideofunit)

1(2s)

NOTE -For installation on combustiblefleers, the furnace shaft not be installed directly on carpeting, tile, or other

combustible material other than wood flooring.

Accessibility and service clearances must take prece- dence over fire protectionclearances.

For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source

are located no less than 18 inches(457 mm) above the floor. The furnace must be located or protected to avoid physical damage by vehicles. When e furnace is installed

in a public garage, hangar, or other building that has a hazardous atmosphere,the fumace mustbe installed ac-

cording to recommended good practice requirements and current National Fuel Gas Code or CAN/CGA B149.1 and B149.2 standards.

When the furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of. cool-

ing units to avoid condensation in the heating compart- ment. With a parallel flow arrangement, a damper (or oth-

er means to control the flow of air) must adequately prevent chilled air from entering the furnace. If the damp- er is manually operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full =HEAT" or "COOL" setting.

When installed, the furnace must be electrically grounded according to local codes. In addition, in the United States,

installation must conform with the current National Elec- tric Code, ANSI/NFPA No. 70. The National Electric Code

(ANSI/NFPA No. 70) is available from the following ad-

dress:

National Fire Protection Association 1 Battery March Park Quincy, MA 02269

In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part I (CSA Standard C22.1 ) and/or local codes.

Field widng connections must meet or exceed specifica-

tions of type T wire and withstand a maximum tempera- ture dee of 180°F (82°C).

G32 unit must be installed so that electrical components are protected from water.

When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside of the space containing the furnace, return air shall be handled by a

duct(s) sealed to the furnace casing and terminating out- side space containing furnace.

A WARNING

Page 4

NOTE - G32 senes units must not be used as a construc- tion heater dunng any phase of construction. Very low re.

turn air temperatures, harmful vapors and misplacement of the filters will damage the unit and lower its efficiency.

The G32Q is an upflow gas furnace. A changeover kit is necessary if the furnace is to be used with L.P. gas,

These instructions are intended as a general guide and do not supersede Focal codes in any way. Consult authori- ties having jurisdiction before installation.

Shipping and Packing List

1 - Assembled G32 furnace 1 - 3 inch x 2 inch vent transition piece (-100, -125

units only)

1 - Bag assembly containing:

1 - Electrical make-up box 1 - Widng harness 1 - Snap bushing

2 - Filter clips

1 - Condensate plug 1 - Condensate drain adapter 1 - Brown accessory wire

1 - Green ground wire

4 - Wire nuts 2 - Star washers and screws

8 - Self-tapping screws 1 - Grounding label

1 - Wire tie

3 - Thread-forming screws

Shipping Damage

Check equipment for shipping damage. If you find any damage, immediately contact the last carrier.

I Insta!iatton' Setttng Equipment

Select a location that allows for required clearances listed on the unit rating plate. Also consider gas supply connec-

tions, electrical supply, vent connection and installation and service clearances [24 inches (610 mm) at unit front].

The furnace must be level.

NOTE - 1/3 and 1/2 hp blower motors are equipped with either four flexible mounting legs or three flexible legs and one ngid leg. The ngid leg is equipped with a shipping bolt

and a flat white plastic washer (rather than the rubber mounting grommet used with a flexible mounting leg).

This shipping bolt and flat washer must be removed be- fore the furnace is put into operation. Once the sh_pping bolt and washer are removed, the rigid leg will not touch

the blower housing.

_ CAUTION

[ . WARNING I

WARNING

Returnaircan be brought ineithersideor atthe bottomof

the unit.Scdbelinesshowthe outlineofeach sideandthe

bottom return air opening.

Page 5

Bottom Return Air Applications If return air is to terminate through the floor under the fur-

nace, a direct, airtight and sealed connection must be made to the bottom of the furnace,

1 - Cut opening in floor or platform. Using knockouts

provided, cut bottom of base panel. See figure 2.

KNOCKOUT PATTERN FOR BOTTOM

RETURN AIR APPLICATION

,v vd

iV Vd

Bottom Return Air Applications

1 - Remove blower access panel.

2- Install filter clips, provided with unit, by slipping

folded section of clip on edge of bottom opening. See figure 4.

3 - Place filter in bottom of blower compartment beneath

rear filter clip. Press down on filter sides. Filter clips flex allowing filter to snap into place.

4 - To remove filter, press clip and pull filter up and out.

BOTTOM RETURN FILTER INSTALLATION

REAR FILT R CLIP

URNACE

BACK

FIGURE 2

2 - Bend a flange on return air plenum and lower into

floor or platform opening, See figure 3.

3 - Position unit over return air opening. Seal unit air

tight with return air plenum•

BOTTOM RETURN AIR APPLICATION

G32 UNIT

RETURN AIR

PLENUM

PROPERLY

SIZED FLOOR

OPENING

FIGURE 3

NOTE - Be cerefu/ not to damage insulation. Check for tight seal,

Side Return Air Applications For installationswhere the return air is taken fl'oma retum

airdrop,unitmay be installed with mtum airentl_ through eitherthe left or rightside of thefurnace.

For sidereturnair applications,cutfurnace cabinetat the

dimensionsgivenon page 2. Embossedcomers are pro- vided onbothcabinet sidesfor returnairopeninglocation.

i_ii_!'2'i:i:i_:"i:ii:i:i:;'i:!:11:71:i:7i:i:7!:;:i!:ii:ii;ii'i:ii'i:_;:""_'::<"_i:":i_i_ii,ii_::i:!Ti:i;_;:7:%TiJ;:::tT;;:::7:7

This unitis not equippedwith a filteror rack.A field-pro- videdhigh-velocityfilteris requiredforthe unitto operate

properly.A filter must be in place any time the unit is operating. The unit does include filter clips for instal-

lation of a field-provided, internally installed filter. See figure 4.

SIDE _

FURNACE FURNACE

FIGURE 4

Side Return Air Applications Filter racks are available fromLennoxfor side returnair

applications.See figures5 and 6.

NOTE - Thefilter doormay be shipped in therack behind thefilter./fnecessa_ remove the filter, retrieve the door

and continuewiththe installationof the rack.

1 - Align filterrack opening withthe inside edge of the

side return opening. Bottom of rack should be approximately1 inch(25 mm) fromthe bottom and 3

inches(76 mm) from the frontof the unit.

2 - Screw filter rack intoplacewiththe eightselfddll,self

tap screws provided.See figure 5.

3 - Push filter door pinsthrough the two holes in filter

doorfrom the insideof the u-channel. See figure 6.

SIDE RETURN FILTER INSTALLATION

in.(turn)

BLOWER DECK _=

RETURN AIR

RETURN 12 in. (305) for

AIR 14 in. 13561Filter

OPENING t8 In. (437) for

20 in, (508) Filter

1-13/t6in.

cAa,NETBASEI; .OM,I

PLENUM SIZE

12-314 In X 23-1/2 In (324 X

597) for 14 In (356) Filter 18-3/4 In. x 23-1/2 In,

(476 x 507)

for 20 In. 1508) Filter

(34)

FIGURE 5

Page 6

FILTER DOOR ASSEMBLY

FILTER DO0_ _

PIN _T_ TAB

FILTER DOOR I I I _'l]l

FILTER

FIGURE 6

4 - Positionfilter door on end offilter so that the thumb

tab side of the filter door is away from the furnace.

Squeeze thumb tabs to secure filter to door.

5 - Guide filter and filter door into the filter rack installed

on side of furnace. Push door into filter rack until se-

cure.

6 - To remove filter,pull filterdoor pins untildoor is re-

leased from filter rack,

Use industry-approved standards to size and install the supply and return air duct system. This will resultin a quiet

and low-static system that has uniform air distribution. Supply Air Plenum

Furnaces installedwithout acoolingcoilrequirethe installa-

tion of aremovable access panel inthe supplyair ducL The access panel should be large enough to permit inspection

(either by smoke or reflectedlight) ofthe heatexchanger for leaksafter installation. The furnace access panel must al-

ways be in placewhen the furnace is operatingand it must not allow leaks into the supply air duct system.

Return Air Plenum See dimensionillustrationon page 2 for properreturnair

duct size.

NOTE - For bottomreturn air, returnairductshouldbe se-

curedto the unit usingrivets or Sqocks. For side return

air,secure return airduct to filterrackusingscrews. When using screws, take care to avoid interference with the fil-

ter which may cause improper filtration.

The return air must not be drawn from a room where another gas appliance (ie,, a water heater) is installed. Even thoughthisfurnace draws its combustion

air from outside of the structure, other gas appliances that share a utility room may not. When retum air is drawn from a room, a negative pressure is created in the room. If

a gas appliance is operating in a room with negative pres-

sure, the flueproducts can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas

may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be dis-

tributed through the house by the furnace duct system.

Pipe & _tttings S _¢ifi_ti_

J :::%:::::::::::::::: ::: : ::

All pipe,fittings,primerand solventcementmust conform withAmericanNationalStandard Instituteand theAmeri-

can Society for Testingand Materials (ANSI/ASTM) stan-

dards. The solvent shall be free flowing and contain no

lumps, undissolved particles or any foreign matter that adversely affectsthejoint strength or chemical resistance

of thecement. The cement shall show no gelation, stratifi-

cation, or separation that cannot be removed by stining. Refer to table 2 for approved piping and fitting materials.

TABLE 2

PIPING AND FITTINGS SPECIFICATIONS

PIPE & FITrlNG MATERIAL SPECIFICATION

Schedule 40 PVC (Pipe) D1785 Schedule 40 PVC (CellularCore Pipe) F89t

Schedule 40 PVC (Fittings) D2466 Schedule40 CPVC (Pipe) F441 Schedule 40 CPVC (Fittings) F438

SDR-21 PVC (Pipe)or SDR-26 PVC (Pipe) D2241 SDR-21 CPVC (Pipe)or SDR-26 CPVC (Pipe) F442 Schedule 40 ABS (Pipe) D1527

Schedule 40 ABS (Fittings) D2468 ABS-DWV (Drain Waste & Vent)

(Pipe & Fittings) D2661

PVC-DWV (Drain Waste & Vent - D2665 Pipe & Fittings)

ASTM

A CAUTION

Primers and solventsmust meet ASTM specifications, PVC pdrnerisspecifiedin ASTM F 656. UsePVC solvent cement as specified in ASTM D 2564 and ABS solvent

cement as specified in ASTM D 2235. Low temperature

solvent cement is recommended. Metal or plastic strap- ping may be used for vent pipe hangers.

Table 3 liststhe available exhaust termination kits. All

Lennox vent terminations are PVC.

]

Page 7

TABLE 3

TERMINATION KITS

Lennox Part

No.

60G77

33K97

15F75

22G44

15F74

44J41

44J40

30G28

30G79

Kit LB# Description*Inches (ram)

LB-49107CE

LB-87942

LB-49107CC

LB-49107CD

LB_9107CB

LB-65678A

LB-65701A

WTK

WTKX

1-1/2" (38) Concentric

Termination Kit

3" (50,8) Low Pressure Drop

Concentric Term Kit

2" (50,8) Roof

Termination Kit

2" (50.8) Well

Assembly Termination Kit

2" (50.8) Walt Ring Kit

3" (76,2) Roof

Termination Kit

3" (76.2) Wall

Assembly TerminationKit

2" (50.8) Wall

TerminationExtendedVent

2" (50.6) Wall

TerminationExtensionRiser

When making ABSjoints, pieces can be prepared with a cleaner. When joining ABS to PVC matedals, use PVC

solvent cement. Refer to this procedure as specified in ASTM D3138.

Canada Only - In some provinces, PVC primer must be

purple in color, PVC solvent cement must be grey, ABS solvent cement must be yellow and PVC solvent cement

used when joining ABS to PVC must be white.

[

:: ::,::.:_::: : :: ::.::..: :.:::::::::: .::::::.:::::::::::::::::.:::::::::::::::::;:. :::_:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: :: :: ::.:]

Pipe used for exhaust and intake lines should be sized ac-

cording to table 4. Note that maximum lengthof vent pipe

is for one run; either intake or exhaust. Maximum vent

length given isnot the total length of intake plus exhaust vents.

Each 90° elbow is equivalent to 5 feet (1.52 m) of vent pipe. Two 45° elbows are equivalent to one 90° elbow. One 45° elbow is equal to 2.5 feet (.76 m) of vent pipe.

If intake and exhaust piping runs are not equal in length and number of elbows, the larger diameter pipe must be

used for both runs.

NOTE - When a WTKX terminaUon kit (30G79) is

installed as part of the intake and exhaust piping, add

twelve feet to the equivalent length (the two 2 inch diame- ter 90° elbows end the 27 inch pipe in the kit).

For 75 kBtuh units, connections are provided for 2 inch

diameter venting which should satisfy most venting re- quirements. No transition piecesare provided or needed

for 2 inch venting.

TABLE 4

VENT PIPE SIZING TABLE FOR G32Q FURNACES

MINIMUM DIAMETER OF INTAKE/EXHAUST PIPE

Vent Pipe

Equivalent Length

Max. Feet (Meters)

15 (4.57 m) 20 (6,10 m)

25 (7.62 m)

30 (9.14 m)

40 (12.19 m) 50 (I 5.24 m)

55 (16.76 m) 60 (18,29 m)

70 (21,34 rn) 80 (24.38 m)

90 (27.43 m)

100 (30.48 m) 110 (33,53 m)

120 (36.58 m) 130 (39.62 m)

NOTE - Min. pipeforG32-75 is 5feet and 2elbowsof 2inchdmmeterp_pe. NOTE - Min. pipe for G32-100 is 5feet end 2 elbowsof 2 inch diameter

pipe,

NOTE - Min. pipe for G32-125 is 5 feet and 2 e/bows of 2 inchdiameter pipe.

G32-76 G32-100 G32-125

75,000 100,000 125.000

BTU BTU BTU

2" 2" 2' 2" 2" 3" 2" 2" 3" 2" 3" 3_

2" 3" 3"

2" 3" 3" 2" 3" 3"

3" 3" 3"

3" 3" 3" 3" 3" 3"

3" 3" --

For -100 and -125 kBtuhunits,the intakeconnectionis sized for 3 inch diameter pipe. The exhaustconnection has a 2 inchnipple,A pipetransitionpieceis shippedwith the unitto connectto 3 inchpipe. See figure7 for2 inch

and 3 inchventingapplications. Most venting applicationswillrequire 3 inchventingfor

properunitoperation.For no reason should the intake and exhaust pipe be different diameter pipes. Re-

gardlessofthe diameterofpipe used, the standardroof

and wail terminationsdescribed in Intake and Exhaust Piping Terminations sectionshouldbe used.Exhaustpip-

ingmust terminatewith 1-1/2 inchpipefor 1-1/2 inchor 2 inchventingand 2 inch pipe for 3 inchventing.

G32-100 OR -125 WITH 2 IN. VENTING

2 IN. VEN_] 3RIIENI_X C2EIN,

2IN. I 3IN.

OUT N

G32-100 OR -125 WITH 3 IN. VENTING

3 IN. VENT PiPE

L_I

NIPPLE ,..,

OUT IN

FIGURE 7

Page 8

All cementing of joints should be done according to the specifications outlined in ASTM D 2855.

1 - Measure and cut vent pipe to desired length. 2 - Debur and chamfer end of pipe, removingany ddges

or rough edges. If end is notchamfered, edge of pipe may remove cement fTomfitting socket and result in

a leaking joint.

3 - Clean and dry surfaces to be joined.

4 - Test fit joint and mark depth offitting on outside of

pipe.

5 - Uniformly applyliberal coatof PVC primer for PVC or

ABS cleaner for ABS to inside socket surface of fit- ting and male end of pipe to depth of fitting socket.

6 - Promptly apply solvent cement to end of pipeand in-

side socket surface of fitting. Cement should beap- plied lightly but uniformly to inside of socket. Take

care to keep excess cement out of socket. Apply second coat to end of pipe.

NOTE - Time is critical at this stage. Do not allow

pnmer to dry before applying cement.

7 - Immediately after applying last coat of cement to

pipe, and while both inside socketsurface and end of pipe are wet with cement, forcefully insert endof pipe

intosocket until it bottoms out. Turn pipe 1/4turn dur-

ing assembly (but not after pipe is fully inserted) to distribute cement evenly.

NOTE - Assembly should be completed within 20

seconds after last application of cement. Hammer blows should not be used when inse_ng pipe.

8 - After assembly, wipe excess cement from pipe at

end of fitting socket.A properlymadejointwillshowa

bead around itsentireperimeter. Anygaps may indi-

cate a defective assembly due to insufficientsol- vent.

9 - Handle joints carefully untilcompletelyset.

Iventing ractl es

The thickness of construction through which vent!air in- take pipes may be installed is a minimum of 3inches (76

mm) and a maximum of 24 inches (610 mm). If a G32 fur- nace replaces a furnace which was commonly vented

with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the

heat of the originalfurnace flue products, the existing vent pipe is probably oversized for the single water heater or

other appliance. The vent should be checked for proper draw with the remaining appliance,

Intake Piping

1 - Cement intakepipinginslip connectorlocated at top

of unit.

2 - Route pipingto outside of structure.Continue with

installationfollowing instructionsgiven in exhaust and intakepipingterminationsection.

WARNING

Exhaust Piping

1- Cemente_(haustpipthgintofluecollarsocketloceted

on the left side of the top cap.

2 - All horizontalruns ofexhaust pipe mustslopeback

towardthe unit.A minimumof 1/4 inch(6 ram) drop for each 12inches(305 mm) ofhorizontalrunisman-

datory fordrainage. Horizontal runs ofexhaust pip* ing mustbe supported every 5 feet (1.52 m) using hangers.

Page 9

NOTE - Exhaust piping should be checked carefully to make sure there are no sags or low spots.

NOTE - Exhaust piping must be Insulated wffh 1/2 inch

(13 ram) Armaflex or equivalent when nJn through un- heated space. Do not leave any area of exhaust pipe open to outside air. extenor exhaust must be insulated

wrth 1/2 inch (13 ram) Armaflex or equivalent.

{

Zl, CAUTION

CAUTION

Removal of Unit from Common Venting System

In the event thatan existing furnace is removed from a

venting system commonly run with separate gas ap-

pliances, the venting system may be too largeto property vent the remaining attached appliances. The following

test should be conducted while all appliances (beth inop- eration and those not in operation) are connected to the

common venting system.If the venting system has been installed improperly, corrections must be made as out- lined in the previous section.

1 - Seal any unused openings in the common venting

system.

2 - Visually inspect the venting system for proper size

and horizontal pitchand determinethere is noblock-

age or restdction,leakage, corrosionor other defi-

ciencieswhich couldcause an unsafe condition.

3 - To the extent that it is practical, close all building

doors andwindows,and alldoorsbetweenthe space in which the appliancesremainingconnectedto the

common venting system are located and other

spaces of the building. Turn on clothes dryers and any appliancesnot connectedto the common vent-

ing system. Turn on any exhaust fans, suchas range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer ex-

haust fan. Close fireplace dampers.

4 - Follow the lightinginstructions. Place the appliance

being inspected in operation. Adjust thermostat so appliance will operate continuously.

5 - Testfor spillage at thedraft hood relief openingafter

5 minutes of main burner operation. Usethe flame of match or candle, or smoke from a cigarette or cigar,

or a draftgauge.

6- After determining that each appliance remaining

connected to the common venting system properly vents when tested as indicated in step 3, return doors, windows, exhaust fans, fireplace dampers

and any other gas-burning appliance to their pre-

vious condition of use.

7 - If improper venting is observed dudng any of the

above tests, the common venting system must be corrected. The common venting system shouldbe resized to approach the minimum size as deter-

mined by using the appropriate tables in appendixG in the current standards of the National Fuel Gas

Code ANSI Z223-1 in the USA, and the appropriate Category 1 Natural Gas appliances venting sizing

tables in the current standard of the CAN/ CGA-B149.1 in the Natural Gas InstalLationCode in

Canada.

Intake and Exhaust Piping Terminations Intake and exhaustpipesmay be routedeitherhorizontal- lythrough an outsidewallor verticallythroughthe roof.In

attic or closet instaUations,verticalterminationthrough the roofis preferred. Figures 8 through20 show typical

terminations.

1 - Use recommendedpiping materials for both intake

and exhaust piping.

2 - Secure all joints,includingdrain leg, gas tightusing

approvedcement.

3 - Pipingdiametersshouldbe determinedaccordingto

length of pipe run.See table 4. Locate intakepiping upwind (prevailing wind) from exhaust piping. To

avoid recirculation of exhaust gas on roof termina- tions, end of exhaust pipe must be higher than intake

pipe.

Exhaust and intake exits must be in same pressure zone. Do not exit one through the roof and oneon the

side. Also, do not exittheintake on one sideand the exhaust on another side of the house or structure.

4 - intake andexhaust pipes should be placed as close

together as possible at termination end (refer to il- lustrations). Maximum separation is 3 inches (76

ram) on roof terminations and 6 inches (152 ram)on

sidewall terminations.

5 - Exhaustpipingmust terminate straightout or up as

shown, tn rooftopapplications,a 2 inchX 1-1/2 inch

reducer for 2 inch venting,3 inch x 2 inch reducerfor

3 inch venting must be used on the exhaust piping at

the point where it exits the structure to improve the velocity of exhaust away from the intakepiping.

Page 10

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