Lennox G32Q4-100 User manual

LENNOX
_2001 Lennox Industt]e-_ _nc
Dallas Texas USA
INSTALLATION
INSTRUCTIONS
G32Q SERIES UNITS
GAS UNITS
504,488M _[_2ech nical
11/2001 blications
Supersedes504,382M LithoU.S.A.
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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
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,
WHAT TO DO IF YOU SMELL GAS:
• 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.
11101 504,488M
IIIIIIIIIlHIIIIIIHIIIIIIIIIIIIIIIIII Pagol IIIIHIIIIIIIIllllIIHHItllUlIIHII

11116
(41)
_8
(16)'-IP
1 1116 3 5/8
,o-oI
• v 151 )AIR OUTLET
TOP VIEW
"ql'-- 28 1/2
(724)
I I
ELECTRICA
INLETS_
{BothSides)
m
L _____(EitherSide) J
Lt:;:"ZtJ
Return Air
Knockout (Bottom)
SIDE VIEW
T
21 3/4
(552)
GAS PIPING
INLET
(Both Sides)
91- 4(102)
T
46
(1168)
EXTERNAL
SIDE RETURN
/_R FIL'I1ERK]T
(Either Side
O_onal ,
4 (I02) E-IP
,lira A_
I I
t
AIR FLOW
Return Air
Knockout (Bottom)
FRONT VIEW
A B C D E F G H
Model No. in. I mm in. mm in. mm In, mm In. mm in. mm in. mm in, mm
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
Page 2

GLASS FIBER GASKET
FRESH AIR
INTAKE FITTING
BURNERBOX
ASSEMBLY
PATCH
FLUE COLLAR
TOP CAP
WARM
HEADER
_I (COLLECTORTH__
. BOX
/
/PATCH PLATE WITH
l BARBED FITTING
AND FLAME
ROLL-OUT SWITCH
FLUE
DuralokPlus TM
HEAT EXCHANGER
ASSEMBLY
CABINET
RESSURE-.
FLAME SIGHT pswrrcH
GLASS /
BURNER BOX /HIGH HEAT
COVER ]3NO-STAGE PRESSURE
GAS VALVEAND SWITCH
MANIFOLD (-75 only)
BURNER
ACCESS
PANEL
BLOWER
ACCESS
DOOR
TWO-SPEED
COMBUSTION AIR
INDUCER
AIR
ORIFICE
z-/"
COLD HEADER
(COLLECTOR)
BOX
4. SUPPLY
AIR
S/" _ BLOWER
DOOR INTERLOCK SWITCH
CONDENSERCOIL
CONTROL TRANSFORMER
CONTROL VOLTAGE
CIRCUIT BREAKER
TWO-STAGE CONTROL BOARD
LBOARD
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 Condensate side
Top
Exhaust
To combustible
materials Side, rear,and front
Floor
Inches(mrn)
24 (610)
3(76)
(fromsideofunit)
1(2s)
0
0
0*
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 Focalcodes 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.
IInsta!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
WARNING
Returnaircan be brought ineithersideor atthebottomof
the unit.Scdbelinesshowtheoutlineofeachsideandthe
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
_
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
PROPERLY
SIZED FLOOR
OPENING
RETURN AIR
PLENUM
FIGURE 3
NOTE -Be cerefu/ not to damage insulation. Check for
tight seal,
Side Return Air Applications
For installations where thereturn air istaken fl'omaretum
airdrop,unitmay be installed with mtum airentl_ through
eitherthe left or rightside of thefurnace.
For sidereturnair applications,cutfurnacecabinetat the
dimensionsgivenon page 2. Embossedcomers arepro-
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 unitisnot equippedwith a filteror rack.A field-pro-
videdhigh-velocityfilteris requiredforthe unittooperate
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.
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
SIDE _
FURNACE FURNACE
FIGURE 4
Side Return Air Applications
Filter racksare available from Lennoxfor 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 filterrackopening 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 - Screwfilter rack intoplacewiththeeightselfddll,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 12 in. (305) for
AIR 14 in. 13561 Filter
OPENING t8 In. (437) for
20 in, (508) Filter
1-13/t6in.
cAa,NETBASEI; .OM,I
RETURN AIR
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 x507)
for 20 In. 1508) Filter
(34)
FIGURE 5
Page 6

FILTER DOOR ASSEMBLY
FILTER DO0_ _
PIN _T_ TAB
FILTER DOOR II 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 isre-
leased from filter rack,
Use industry-approved standards to size and install the
supply and return air duct system. This will result in a quiet
and low-static system that has uniform air distribution.
Supply Air Plenum
Furnaces installedwithout a coolingcoilrequirethe installa-
tion of a removable 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 isoperatingand itmust
not allow leaks into the supply air duct system.
Return Air Plenum
See dimensionillustrationon page 2 for properreturnair
duct size.
NOTE -Forbottomreturn air,returnair ductshouldbe se-
curedto the unitusingrivets 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 solventcementmustconform
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
ASTM
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)
ACAUTION
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

Lennox Part
No.
60G77
33K97
15F75
22G44
15F74
44J41
44J40
30G28
30G79
LB-49107CE
LB-87942
LB-49107CC
LB-49107CD
LB_9107CB
LB-65678A
LB-65701A
WTK
WTKX
TABLE 3
TERMINATION KITS
Kit LB# Description*Inches (ram)
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 ABS joints, 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 solventcement
used when joining ABS to PVC must be white.
[l
:: ::,::.:_::: ::: ::.::..: :.:::::::::: .::::::.:::::::::::::::::.:::::::::::::::::;:. :::_:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: :: :: ::.:]
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 tothe equivalent length (the two 2inch diame-
ter 90°elbows end the 27 inch pipe in thekit).
For 75 kBtuh units, connections are provided for 2 inch
diameter venting which should satisfy most venting re-
quirements. No transition pieces are 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)
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" 3"
3" 3" 3"
3" 3" 3"
3" 3" 3"
3" 3" --
NOTE - Min. pipeforG32-75 is5feet and 2elbowsof 2inchdmmeterp_pe.
NOTE -Min. pipe for G32-100 is 5feet end 2 elbowsof 2inch diameter
pipe,
NOTE -Min. pipe for G32-125 is 5 feet and 2 e/bowsof2 inchdiameter
pipe.
For -100 and -125 kBtuhunits,the intakeconnectionis
sized for 3 inchdiameter pipe. The exhaustconnection
has a 2 inchnipple,Apipetransitionpieceisshippedwith
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-
ingmustterminatewith 1-1/2 inchpipefor 1-1/2 inchor 2
inchventingand 2 inch pipe for 3 inchventing.
G32-100 OR -125 WITH 2 IN. VENTING
2IN. VEN_] 3RIIENI_XC2EIN,
2IN. I 3IN.
OUT N
G32-100 OR -125 WITH 3 IN. VENTING
L_I
NIPPLE ,..,
OUT IN
FIGURE 7
3 IN. VENT PiPE
I
Page 8

All cementing of joints should be done according to the
specifications outlined in ASTM D 2855.
1 - Measure and cut vent pipeto desired length.
2 - Debur and chamfer end of pipe, removing any 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 coat of 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 be ap-
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 offitting socket.Aproperlymadejointwillshowa
bead arounditsentireperimeter. Anygaps may indi-
cate a defective assembly due to insufficientsol-
vent.
9 - Handle joints carefully untilcompletelyset.
Iventingractl es
The thickness of construction through which vent!air in-
take pipes may be installed is a minimum of 3 inches (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 original furnace flue products, the existingvent
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 - Allhorizontalrunsofexhaust pipe mustslopeback
towardthe unit.Aminimumof 1/4 inch(6 ram) drop
for each 12inches(305 mm) ofhorizontalrunisman-
datory fordrainage. Horizontal runsofexhaust 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 I
CAUTION
Removal of Unit from Common Venting System
In the event thatan existing furnace is removedfrom 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 in op-
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 otherdefi-
ciencieswhichcouldcause an unsafe condition.
3 - To the extent that it is practical, close all building
doors andwindows,and alldoorsbetweenthespace
in whichthe appliancesremainingconnectedto the
common venting system are located and other
spaces of the building. Turn on clothes dryers and
any appliancesnot connectedto the commonvent-
ing system. Turn on anyexhaust fans, suchas range
hoods and bathroom exhausts, so they willoperate
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 outsidewall or verticallythroughthe roof.In
attic or closet instaUations,verticalterminationthrough
the roofis preferred. Figures 8 through20 show typical
terminations.
1-Use recommendedpiping materialsfor bothintake
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. Donot exit one through the roof and one on the
side. Also, do not exittheintake on one sideand the
exhaust on another side of the house or structure.
4 - intake and exhaust 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-Exhaustpipingmustterminate straightout or up as
shown, tnrooftopapplications,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