Lennox International Inc G32Q3 100 Users Manual

LENNOX Furnace/Heater, Gas Manual L0406281 LENNOX Furnace/Heater, Gas Owner's Manual, LENNOX Furnace/Heater, Gas installation guides

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2015-02-09

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LENNOX

INSTALLATION
INSTRUCTIONS

_2001 Lennox Industt]e-_ _nc
Dallas Texas USA

G32Q SERIES

UNITS

GAS UNITS
504,488M
11/2001

_[_2ech

Supersedes504,382M

ITahi6 of_ _ _te:nts

RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

nical
blications

Litho U.S.A.

Unit Dimensions ................................
G32Q Parts Arrangement .......................
Requirements ..................................
General .......................................
Installation - Setting Equipment ..................
Return Air Opening Guidelines ...................
Filters & Optional Filter Assembly .................
Duct System ...................................
Pipe & Fittings Specifications ....................
Vent Piping L_uidelines..........................
Joint Cementing Procedure ......................
Venting Practices ...............................
Gas Piping ...................................
Electrical .....................................
Unit Start-Up .................................
Heating Sequence of Operation .................
Blower Operation ..............................
Gas Pressure Adjustment ......................
High Altitude Information .......................
Other Unit Adjustments ........................
Service ......................................
Repair Parts ..................................
Troubleshooting ...............................
Start-Up & Performance Checklist .

2
3
4
5
5
5
6
7
7
8
8
9
15
16
21
22
22
22
23
23
24
27
27
32

-AWARNING

WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of this or any other appliance.
Installation
and service must be performed by a qualified installer, service
agency or the gas supplier,

• 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

IIIIIIIIIlHIIIIIIHIIIIIIIIIIIIIIIIII

504,488M

Pagol

IIIIHIIIIIIIIllllIIHHItllUlI

1 1116

3 5/8

1 1116
(41)

,o-oI
_8
(16)'-IP
•

AIR OUTLET

151 )

TOP VIEW
"ql'--

28 1/2
(724)

,lira

T
21 3/4
(552)

(1168)

ELECTRICA
INLETS_
{BothSides)

EXTERNAL
SIDE RETURN
/_R FIL'I1ERK]T
(Either Side
O_onal
,

GAS PIPING
INLET
(Both

Sides)

AIR FLOW

91- 4(102)

_____(Either Side) J

Lt:;:"ZtJ

4 (I02)

E-IP

Return Air
Knockout (Bottom)

SIDE VIEW

FRONT VIEW

Model No.

in.

I mm

in.

In,

In.

in.

in,

G32Q3-75

16-1/4

413

14.1/8

359

305

2-118

7-5/8

194

356

12-3/4

324

G32Q3/4-100
G32(_4/5-100

21-1/4

540

19-1/8

486

457

1-5/8

10-1/8

257

508

18-3/4

476

G32Q4/5-125

26-1/4

667

24-1/8

613

457

4-1/8

105

12-5/8

321

508

18-3/4

476

Page 2

GLASS FIBER GASKET
FLUE COLLAR
FRESH AIR
INTAKE FITTING

TOP CAP
HEADER

BURNERBOX
ASSEMBLY

.
/
/

PATCH

BOX
(COLLECTORTH_
_
PATCH PLATE WITH
l
BARBED FITTING
WARM
AND FLAME
ROLL-OUT SWITCH

CABINET

FLUE

DuralokPlus TM
HEAT EXCHANGER
ASSEMBLY

FLAME SIGHT p
GLASS

BURNER BOX

COVER

]3NO-STAGE
GAS VALVE AND
MANIFOLD

RESSURE-.
swrrcH
HIGH HEAT
PRESSURE
SWITCH
(-75 only)

4.
S/"

SUPPLY
AIR

BLOWER

BURNER
ACCESS
PANEL

AIR
ORIFICE

CONDENSERCOIL
CONTROL TRANSFORMER

BLOWER
ACCESS
DOOR

CONTROL VOLTAGE
CIRCUIT BREAKER

z-/"

TWO-STAGE CONTROL BOARD
LBOARD

COLD HEADER
(COLLECTOR)
BOX
DOOR INTERLOCK SWITCH
TWO-SPEED
COMBUSTION AIR
INDUCER

FIGURE 1

Page 3

Lennox G32Q units are CSA International
ANSI Z21.47 and CSA 2.3 standards.
In the USA, installation

of Lennox

certified

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

gas central furnaces

must conform with local building codes. In the absence of
local codes, units must be installed according to the current 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
11 West 42rid Street

Institute,

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

er means to control the flow of air) must adequately
prevent chilled air from entering the furnace. If the damper 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 Electric Code, ANSI/NFPA No. 70. The National Electric Code

Inc.

New York, NY 10036
In Canada, installation must conform with current National Standard of Canada CAN/CGA-B149.1
"Installation

(ANSI/NFPA
dress:

No. 70) is available from the following ad-

Code for Natural Gas Burning Appliances and Equipment" and CAN/CGA-B149.2
"Installation Code for Pro-

National Fire Protection Association

pane Gas Burning Appliances and Equipment,"
local
plumbing or waste water codes and other applicable local
codes.

Quincy, MA 02269

1 Battery March Park

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.

This furnace is CSA International certified for installation
clearances to combustible matedal as listed on the unit
rating

plate

and in table

Field widng connections

TABLE
Clearances

Location

Inches (mrn)

Front

24 (610)

Condensate side

3 (76)
(fromsideofunit)

Top

1(2s)

Exhaust

Side, rear, and front

Floor

Service access

To combustible
materials

must meet or exceed specifica-

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

a maximum

tempera-

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
side space containing furnace.

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

Page 4

A WARNING

out-

NOTE - G32 senes units must not be used as a construction 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 authorities 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

I Insta!iatton'

Setttng Equipment

Select a location that allows for required clearances listed
on the unit rating plate. Also consider gas supply connections, 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 before 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

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
8 - Self-tapping
1 - Grounding
1 - Wire tie

and screws
screws

label

3 - Thread-forming
Shipping

[

screws

Damage

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

WARNING

Return air can be brought in eitherside or at the bottomof
the unit.Scdbe linesshowthe outlineof each side and the
bottom return air opening.

Page 5

Bottom

Return

Air Applications

If return air is to terminate

Bottom

through the floor under the fur-

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

must be

1 - Cut opening in floor or platform. Using knockouts
provided, cut bottom of base panel. See figure 2.

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.

KNOCKOUT PATTERN FOR BOTTOM
RETURN AIR APPLICATION

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

BOTTOM RETURN FILTER INSTALLATION
REAR

SIDE _

2 - Bend a flange on return air plenum and lower into
floor or platform opening, See figure 3.

FURNACE

3 - Position unit over return air opening. Seal unit air
tight with return air plenum•
RETURN

R CLIP
URNACE
BACK

FIGURE 2

BOTTOM

FILT

FIGURE 4
Side Return Air Applications

AIR APPLICATION

Filter racks are available from Lennox for side return air
applications.See figures 5 and 6.
NOTE - The filter doormay be shipped in the rack behind
the filter./fnecessa_
remove the filter, retrieve the door
and continuewith the installationof the rack.

G32 UNIT
RETURN AIR
PLENUM

1 - Align filter rack opening with the inside edge of the
side return opening. Bottom of rack should be
approximately 1 inch(25 mm) from the bottom and 3
inches (76 mm) from the front of the unit.

PROPERLY
SIZED FLOOR
OPENING

2 - Screw filter rack intoplace with the eightselfddll,self
tap screws provided.See figure 5.
FIGURE

3 - Push filter door pins through the two holes in filter
door from the inside of the u-channel. See figure 6.

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

SIDE RETURN

Side Return Air Applications
For installations where the return air is taken fl'oma retum
air drop, unitmay be installed with mtum air entl_ through
either the left or right side of the furnace.
For side returnair applications,cut furnace cabinetat the
dimensionsgiven on page 2. Embossedcomers are provided on bothcabinet sidesfor returnair opening location.

Page 6

INSTALLATION
in.(turn)

BLOWER DECK _=

RETURN
AIR
OPENING

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 unit is not equipped with a filteror rack. A field-provided high-velocityfilteris requiredfor the unit to operate
properly.A filter must be in place any time the unit is
operating. The unit does include filter clips for installation of a field-provided, internally installed filter.
See figure 4.

FILTER

12 in. (305) for
14 in. 13561 Filter
t8 In. (437) for
20 in, (508) Filter

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 x 507)
for 20 In. 1508) Filter

1-13/t6
in.

cAa,NET
BASEI; .OM
,I
FIGURE 5

(34)

FILTER DOOR ASSEMBLY
FILTER DO0_

PIN
FILTER

DOOR

_T_

TAB

a gas appliance is operating in a room with negative pressure, the flue products 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 distributed through the house by the furnace duct system.

I I I _'l]l
FILTER
J

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 secure.
6 - To remove filter, pull filterdoor pins untildoor is released from filter rack,

Pipe & _tttings

S _¢ifi_ti_

:::% :::::: ::::::::::

Supply Air Plenum
Furnaces installed without a cooling coilrequire the installation of a removable access panel in the supply air ducL The
access panel should be large enough to permit inspection
(either by smoke or reflected light) of the heat exchanger for
leaks after installation. The furnace access panel must always be in placewhen the furnace is operating and it must
not allow leaks into the supply air duct system.
Return Air Plenum
See dimensionillustrationon page 2 for proper return air
duct size.
NOTE - For bottomreturn air, returnair ductshouldbe secured to the unit using rivets or Sqocks. For side return
air, secure return air duct to filterrack usingscrews. When
using screws, take care to avoid interference with the filter 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

]

: ::

All pipe,fittings,primerand solventcementmust conform
with American NationalStandard Instituteand the American Society for Testingand Materials (ANSI/ASTM) standards. The solvent shall be free flowing and contain no
lumps, undissolved particles or any foreign matter that
adversely affects the joint strength or chemical resistance
of the cement. The cement shall show no gelation, stratification, 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
Schedule 40 PVC (Pipe)

ASTM
SPECIFICATION
D1785

Schedule 40 PVC (Cellular Core Pipe)
Schedule 40 PVC (Fittings)
Schedule 40 CPVC (Pipe)

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.

:::

F89t
D2466
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 Pipe & Fittings)

D2665

CAUTION

Primers and solvents must meet ASTM specifications,
PVC pdrnerisspecifiedin ASTM F 656. Use PVC 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 strapping may be used for vent pipe hangers.
Table 3 lists the available exhaust termination kits. All
Lennox vent terminations are PVC.

Page 7

TABLE 3
TERMINATION KITS
Lennox Part
No.

60G77

33K97

15F75

22G44

Kit LB#

LB-49107CE

LB-87942

LB-49107CC

LB-49107CD

15F74

LB_9107CB

44J41

LB-65678A

44J40

30G28

30G79

LB-65701A

WTK

WTKX

Description*Inches

TABLE 4
VENT PIPE SIZING TABLE FOR G32Q FURNACES
MINIMUM DIAMETER OF INTAKE/EXHAUST
PIPE
(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

Vent Pipe
Equivalent Length
Max. Feet (Meters)

G32-76
75,000
BTU

G32-100
100,000
BTU

G32-125
125.000
BTU

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)

3" (76,2) Roof
Termination Kit

80 (24.38 m)

90 (27.43 m)

3" (76.2) Wall
Assembly TerminationKit

100 (30.48 m)

110 (33,53 m)

2" (50.8) Wall
Termination ExtendedVent

120 (36.58 m)

130 (39.62 m)

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

2" (50.6) Wall

Termination ExtensionRiser

pipe,

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 solvent cement
used when joining ABS to PVC must be white.

[

l
:: ::,::.:_::: : :: ::.::..:

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

Pipe used for exhaust and intake lines should be sized according to table 4. Note that maximum length of vent pipe
is for one run; either intake or exhaust. Maximum vent
length given is not the total length of intake plus exhaust
vents.

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

For -100 and -125 kBtuh units, the intake connection is
sized for 3 inch diameter pipe. The exhaust connection
has a 2 inchnipple,A pipe transitionpiece is shippedwith
the unitto connectto 3 inchpipe. See figure 7 for 2 inch
and 3 inch venting applications.
Most venting applicationswill require 3 inch venting for
proper unitoperation.For no reason should the intake
and exhaust pipe be different diameter pipes. Regardless of the diameter of pipe used, the standard roof
and wail terminations described in Intake and Exhaust
Piping Terminations sectionshouldbe used.Exhaustpipingmust terminatewith 1-1/2 inchpipefor 1-1/2 inchor 2
inchventing and 2 inch pipe for 3 inch venting.

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.

G32-100 OR -125 WITH 2 IN. VENTING
2 IN. VEN_]

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 diameter 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 requirements. No transition pieces are provided or needed
for 2 inch venting.

3RIIENI_
X C2EI
N,

2IN.

I 3IN.

OUT

G32-100 OR -125 WITH 3 IN. VENTING
3 IN. VENT PiPE

NIPPLE

,..,

L_I

OUT
IN
FIGURE 7

Page 8

Iventingractl es
All cementing
specifications

of joints should be done according
outlined in ASTM D 2855.

The thickness of construction through which vent!air intake pipes may be installed is a minimum of 3 inches (76
mm) and a maximum of 24 inches (610 mm). If a G32 furnace 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 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

to the

1 - Measure and cut vent pipe to desired length.
2 - Debur and chamfer end of pipe, removing any ddges
or rough edges. If end is not chamfered, edge of pipe
may remove cement fTomfitting socket and result in
a leaking joint.

1 - Cement intakepipingin slip connectorlocated at top
of unit.
2 - Route pipingto outside of structure. Continue with
installationfollowing instructionsgiven in exhaust
and intake pipingterminationsection.

3 - Clean and dry surfaces to be joined.

WARNING

4 - Test fit joint and mark depth of fitting on outside of
pipe.
5 - Uniformly applyliberal coat of PVC primer for PVC or
ABS cleaner for ABS to inside socket surface of fitting and male end of pipe to depth of fitting socket.
6 - Promptly apply solvent cement to end of pipeand inside socket surface of fitting. Cement should be applied 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 end of pipe
into socket until it bottoms out. Turn pipe 1/4 turn during 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.

Exhaust Piping
1- Cemente_(haustpipthgintofluecollarsocketloceted
on the left side of the top cap.

8 - After assembly, wipe excess cement from pipe at
end of fitting socket.A properlymade jointwillshowa
bead around itsentire perimeter. Any gaps may indicate a defective assembly due to insufficientsolvent.
9 - Handle joints carefully until completely set.

2 - All horizontal runs of exhaust pipe must slope back
toward the unit. A minimum of 1/4 inch(6 ram) drop
for each 12 inches(305 mm) ofhorizontal runis mandatory fordrainage. Horizontal runs ofexhaust pip*
ing must be supported every 5 feet (1.52 m) using
hangers.

Page 9

5 - Test for spillage at the draft hood relief openingafter
5 minutes of main burner operation. Use the flame of

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

match or candle, or smoke from a cigarette or cigar,
or a draft gauge.

NOTE - Exhaust piping must be Insulated wffh 1/2 inch
(13 ram) Armaflex or equivalent when nJn through unheated 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

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 previous 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 determined 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 InstalLation Code in
Canada.

CAUTION

Removal of Unit from Common Venting System
In the event that an existing furnace is removed from a
venting system commonly run with separate gas appliances, the venting system may be too largeto property
vent the remaining attached appliances. The following
test should be conducted while all appliances (beth in operation 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 outlined 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 determine there is no blockage or restdction,leakage, corrosionor other deficiencies which could cause an unsafe condition.
3 - To the extent that it is practical, close all building
doors and windows,and all doors between the space
in which the appliances remaining connected to the
common venting system are located and other
spaces of the building. Turn on clothes dryers and
any appliances not connected to the common 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.
4 - Follow the lightinginstructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance will operate continuously.

Intake and Exhaust Piping Terminations
Intake and exhaustpipesmay be routedeitherhorizontallythrough an outsidewall or verticallythroughthe roof.In
attic or closet instaUations,vertical termination through
the roof is preferred. Figures 8 through 20 show typical
terminations.
1 - Use recommended piping materials for both intake
and exhaust piping.
2 - Secure all joints, includingdrain leg, gas tightusing
approved cement.
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 terminations, 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 one on the
side. Also, do not exit the intake on one side and 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 illustrations). Maximum separation is 3 inches (76
ram) on roof terminations and 6 inches (152 ram)on
sidewall terminations.
5 - Exhaust piping must 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 intake piping.

Page 10

On roof terminations, the intake piping should terminate straight down using two 90 ° elbows. See figure 8.

EXHAUST
12 (305) ABOVE
AVERAGE
SNOW
ACCUMULATION

INTAKE
TERMINATION

NOTE - If winter design temperature is below 32°F (O°C),
exhaust piping must be insulated with 1/2 inch (13 mm)
Armaflex
or equivalent
when run through unheated
space. Do not leave any surface area of exhaust pipe
open to outside air," exterior exhaust pipe must be insulated with 1/2 inch (13 ram) Armaflex or equivalent. In extreme cold climate areas, 3/4 inch (19 mm) Armaflex or
equivalent is recommended.
Insulation on outside runs of
exhaust pipe must be painted or wrapped to protect insulation from deterioration.

Inches (mm)

EXHAUST

CONCENTRIC ROOFTOP TERMINATION
(60G77) LB-49107CE for G32-75 Units Only
(33K97) LB-87942 for G32-100 & -125 Units Only

FIGURE 9

NOTE - During extremely
cold temperatures,
below
approximately 20°F (6.67°C), units with long runs of vent
pipe through unconditioned space, even when insulated,
may form ice in the exhaust termination that prevents the
unit from operating properly. Longer run times of at least 5
minutes will alleviate most icing problems. Also, a heating
cable may be installed on exhaust piping and termination
to prevent freeze-ups. Heating cable installation kit is
available from Lennox. See Condensate Piping section
for part numbers.
NOTE - Care must be taken to avoid recirculation of exhaust back into intake pipe.
6 - On field-supplied terminations

1/2 (13) ARMAFLEX
INSULATION IN
UNCONDITIONED SPACE

2 X 1-1/2
(51 X 38)

REDUCER

_ _
1/2 (13) ARMAFLEX
INSULATION

'VC
6 (I 52)
MAXIMUM

2 (_ I PVC

for side wall exits, exOUTSIDE
WALL
Inches (ram)

(15J74)

IMAX.
(ram)

3 x 2 (70 x 51) OR
2 x %1/2 (51 x 38)
PVC REDUCER

1/2 (13) FOAM
INSULATION IN
UNCONDrrlONED
SPACE

12 (305) ABOVE
ACCUMULATION
AVERAGE SNOW

3 (76) OR
2 (5t) PVC

UNCONDmONED
ATTIC SPACE

PROVIDE SUPPORT
FOR INTAKE AND
F.XHAUST LINES

ROOFTERMINATION KIT
(15F'75)LB-49107CCfor 2 (5t) Venting
(44341)LB-65678Afor 3 (76)Venting
FIGURE

12 (305) MIN.

haust piping should extend a maximum of 12 inches
(305 mm) beyond the outside wall. Intake piping
should be as short as possible. See figure 10.
Inches

INTAKE

PLING

TOPVIEW
WALLRINGKIT
LB-49107CB
for2 (50,8 ! Venting
FIGURE 10

On field-supplied terminations, a minimum separation distance between the end of the exhaust pipe
and the end of the intake pipe is 8 inches (203 mm).
8- If intake and exhaust piping must be run up a side
wall to position above snow accumulation or other
obstructions, the piping must be supported every 3
feet (.91 m) as shown in figure 15. Refer to figures 13
and 14 for proper piping method. W'FK wall termination kit must be extended for use in this application,
See figure 18 or use kit WTKX shown in figure 19.
When exhaust and intake piping must be run up an
outside wall, the exhaust piping is reduced to 1-1/2
inches (38 mm) after the final elbow. The intake piping may be equipped with a 90 ° elbow turndown. Using 90 ° turndown will add 5 feet (1.5 m) to the equivalent length of the pipe.
7-

Page 11

1/2 (12.7) FOAM INSULATION
IN UNCONDITIONED SPACE

courtyard areas or other recessed areas. Do not
position termination ends directly below roof eaves
or above a walkway. Since the G32 is a certified direct vent, Category iV gas furnace, the location of
the termination is limited by local building codes. In
the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1 in USA, and current standard CAN/CGA-B149.1
of the Natural Gas
Installation Instructions in Canada for details. The

Inches (mm)

n
OUTSIDEWALL
qlp
Optional

Turndown

Shown
(Intake Onty)

TOPVIEW
WALL TERMINATION
(22G44)LB-49107CDfor 2 (50,8)Venting
(44J40)LB-65701Afor 3 (76.2)Venting

termination should be at least 12 inches (305 mm)
from any opening through which flue products could
enter the building.

FIGURE 11

When horizontally vented, minimum clearance for
termination from electric meters, gas meters, regulators and relief equipment is 4 feet (1.2 m) for US
installations. Refer to the current CAN/CGA-B149.1

EXHAUST
TERMINATION

for installations in Canada or with authorities
local jurisdiction.

EXHAUST

having

At vent termination, care must be taken to maintain
protective coatings over building materials (prolonged exposure to exhaust condensate can destroy
protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8 m) of a
condensing unit because the condensate can dam-

INTAKE
abovegrade,
Inches (ram)

age the painted coating.

CONCENTRIC WALL TERMINATION
(60G77) LB-49107CE for G32-75 Units Only
(331(97) LB-87942 for G32-t00 & -125 Units Only

FIGURE 12
12 (305) MIN for 2 (51)
Inches(mm)

20 (5oa)MAXfor3 (76):

UNCONDITIONED
SPACE

OUTSIDE WALL

PROVIDE SUPPORT
FOR INTAKE AND
/
EXHAUST UNES EVERY

HI II

t2(S_0)ASOVE

3_(914)

1/2113) FOAM
INSULATION IN
UNCONOmONED
SPACE

Ii2 (131 FOAM
INSULATION

SiDE VIEW
WALL RINGTERMINATION
(15F74)LE-49107CBfor 2 In. (51)Venting
See v.ntlng

table 4 for maglng_

venting

lengths

with this Irmr:l_mant.

FIGURE 13
9 - Position terminationends so they are free from any
obstructions and above the level of snow accumulation (where applicable). Termination ends must be a
minimum of 12 inches (305 mm) above grade level.
Do not point into window wells, stairwells, alcoves,

10 - Suspend piping using hangers at a minimum of every
5 feet (1.52 m) for schedule 40 PVC and every 3 feet
(.91 m) for ABS-DWV, PVC-DWV, SDR-21 PVC,
and SDR-26 PVC piping. A suitable hanger can be
fabricated by using metal or plastic strapping or a
large wire tie.
11 - In areas where piping penetrates joists or interior
walls, hole must be large enough to allow clearance
on all sides of pipe as it passes through the center of
the hole.
12 - Isolate piping at the point where it exits the outside
wall or roof.

Page 12

Inches(turn)

1/2 (13)
FOAM
INSULATION

Front View EXHAUST

3 x 2 {76 x 51) OR
2 x 1.t/2 (61 x 36)
REDUCER BUSHING LOCATION

3 (76) OR
2 (51) 90 _ ELBOW

FOR OFFSET TERMINATION

18M

i
Optional Turndown
(Not Shown)
May Be Used on
Intake Only

3 (76) OR
2 (5t) 90" ELBOW

Side View_
Inches (ram)

FRONT VIEW
WALL TERMINATION
(22G44) LB-49107CD
for 2(51) Venting
(44J40) LB-65701A
for 3(76) Venting

FIGURE

EXHAUST VENT

•

INTAKE
VENT

OPTIONAL VENT TERMINATION FOR
MULTIPLE UNIT INSTALLATION
WALL TERMINATION KIT WTK

FIGURE 17

METALOR PLASTIC
STRAPPING

Front

COVER EXHAUST
VENT WITH
1/2 (13)
FOAM
INSULATION

IZ
(3os)

View

INTAKE
AIR
FIGURE
13 - When

furnace

is installed

in a residence

where

unit is

down for an extended
period of time, such
vacation home, make provisions for draining
densate
collection
trap and lines.
shut

14 - Based
a

on the

recommendation

multiplefurnace

to four

horizontally,

kits

as shown

Front View

_,_,

t 2 MIN

(30_)

1127)..L

Above Grade

as a
con-

GRADE

of the manufacturer,

installation

termination

EXHAUST
AIR

may use a group

WTK

assembled

figure

of up

together

////

17.

_--T_--

(('-_-_-_"

"_'l/EXHAUST

INTAKE
AIR

VENT

EXHAARUS
_

/ /
//,ii

----n

812031
I_=_,,,I,,,=_l

SideView
II

Inches (ram)

r'--r

lJil,
/ /

1/2 (13) Foam
Insulation in
Unconditioned _ace

Mn}mum

Side View
/ /

ABO'_GPJmE
, GRADE

VENT TERMINATIONS
MODEL WTK WALL TERMINATION KIT (30G28)
EXTENDED VENT FOR GRADE CLEARANCE

EXHAUST VEN_

FIGURE 18
INTAKE VENT
Inches (mm)

OUTSIDE WALL
VENT TERMINATIONS
WALL TERMINATION KIT 130G28) WTK

FIGURE t6

Page 13

freezing of the condensate, which would block the drainline. Use an electric heat cable if you route the condensate line through unconditioned areas.

Inches (mm)

[

Front View

I '10"

_, EXHAUST

= _
INTAKE

NOTE - Enclosed ex_us_ pipe _s
insuleted w;th _F2 i,_Ch(13 ram)
foam insu_abon If in_al(ear_ ex-

VENT

hsusl I_pes am reversed, sl=land

VENT

r_move

foam

vent mr=st be

instJlat_ot_

insulated

1 - Determine
Ii

CAUTION

and

which side condensate

will exit the unit.

teat)ply to OUmr vent Exhaust

Side View

USTVENT

Connect 1/2 inch (13 mm) plastic pipe plug (provided) in the unused end of the condensate trap.
Install plug so that it is sealed water tight yet able to
be removed. Do not permanently seal the connection. Teflon tape is recommended to seal joint. See
figure 21.
CONDENSATE
ASSEMBLY
(For left or rightinstallation)

iNTAKE
VENT

COMBUSTION AIR
INDUCER BRACKET

COLD
HEADER
BOX

E
ADAPTER

VENT TERMINATIONS
MODEL WTKX (30GT9)
EXTENSION RISER FOR GRADE CLEARANCE

ELBOW

FIGURE 19

G32Q VENTING

IN EXISTING

CONDENSATE TRAP

NIPPLE
ADAPTER

CHIMNEY

BOOTORCAP
FIGURE 2t

3 - Use the provided condensate drain adapter (3/4" x
1/2") and a field-providednipple to carry drainage
outside the cabinet. If a fieldsubstitute is needed, 1/2
inch CPVC x 1/2 inch MPT adapter and 1/2 inch
CPVC is acceptable for use.

NOTE - Do not dischal_e exhaust gases dit ently into
or vent stack.
II ventCal discharge through at, ex_6ng unused chimney or stack ts require 0.15 microamps)

........ 3__

AIR INDUCER
BLOWER
OFF, OFF.

CONTROL CHECKS RETRY
FOR IGNmON
COUNT
HAVE FOUR

SINGLE-STAGE
HIGH HEATONLY
.... MODE j I

-_-

INDOOR BLOWER ON HIGH HEATING
SPEED, ACC, TERM NAL ENERGIZES. I
I

I
1
I

FLAME PRESENT?
!Continuous flame check)
FLAME SIGNAL
( > 0.7 microamps)

PRIMARY LIMIT SWITCH CLOSED?

LOWFLAME
B,GNAL

LED #1 - SLOW FLASH
LED #2 - FAST FLASH

COMBUSTION AIR INDUCER DE-ENERGIZED.
INDOOR
ON.
GAS
VALVE BLOWER
DE-ENERGIZED.
LED #1 - SLOW FLASH; LED #2 - ON.

ROLLOUT SWITCH CLOSED?
J

PRESSURE SWITCH CLOSED?
ICONTtNUED ON NEXT PAGE)
I

CONTINUED

ON NEXT PAGE

Page 29

J-

FAILURE.

YESVALVE OFF.

4 SECONDS_

I
I
I

FLAME

GAS VALVE OPEN
HIGH AND LOW HEAT
(ignitor remains energized,)

LOWHEATONLY

LOWHEATONLY
(Ignitorremains energized,)

LED #1 & LED #2 ALTERNATE

SINGLE-STAGE MODE
_TAS
HIGH HEAT ONLY

MAIN

MODE

HAS THREE
LIMIT CLOSED
MINUTES?
WITHIN

COMBUSTION AIR INDUCER DE*ENERGIZED.
INDOOR BLOWER OFF DELAY (Selected time)
GAS VALVE
LED DE-ENERGIZED.
#1 - ON
LED #2 - SLOW FLASH

HEATINGSEQUENCE
CONTINUED
NORMAL
HEATING
MODE
ABNORMAL
HEATING
MODE
I
I
!

L'WO'STAGE'OOE
I S,N";L;'S_;_%T
CALLFOR 2ridSTAGE
HEAT(HIGHHEAT)
FROM

GAS VALVE DE-ENERGIZED.
INDOOR BLOWER DE-ENERGIZED,
(See top of previous page.)
COMBUSTION AIR INDUCER ON FOR 2.5 MINUTES,

PRESSURESW,TC c

2ridSTAGEON DELAY
ON CONTROLBOARD

THERMOSTAT

COMPLETE

(B, 12 OR 15 MIN

:_ _o
PRESSURE SWITCH WATCHGUARD
COMBUSTION AIR INDUCER
DE-ENERGIZED.

INDOOR
BLOWER
ON
HIGH
HEATING
SPEED?

1
I

COMBUSTION AIR BLOWER ON HIGH SPEED?

HIGH HEAT PRESSURE SWITCH CLOSED?

2.5
MINUTES

HIGH HEAT GAS VALVE OPEN? (8 SEC. DELAY)

COMBUSTION
iNDUCER ON.AIR
_'NO

CONTROL CHECKS: FLAME PRESENCE, CLOSED
PRIMARY LIMIT, CLOSED PRESSURE SWITCHES,
CONTINUOUSLY CLOSED ROLl.OUT SWITCH
(dudng heating cycle).
SEE PREVIOUS SEQUENCES FOR FAILURE MODES.

DEMAND FOR HEAT SATISFIED.
THERMOSTAT OPENS.

GAS VALVE DE-ENERGIZED.

COMBUSTION AIR BLOWER
POST-PURGE - 5 SECONDS.

INDOOR BLOWER
SELECTED TIME OFF DELAY.

5-MINUTE DELAY

YES _
I

PREPURGE

PRESSURESWtTCHCLOSED?

r
I

]
I
J

Page 30

COOLINGSEQUENCEOF OPERATION
NORMAL
I

COOLING

MODE

POWER ON

ABNORMAL

MODE

IGNITION CONTROL MAIN POWER ON.

COOLING

GAS VALVE OFF. COMBUSTION AIR BLOWER OFF, /
INDOOR SLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
INTERRUPT MAIN POWER TO RESET CONTROL.

CONTROL
IS
CONTROLSELF
OPERATING
DIAGNOSTIC
NORMALLY?
CHECK.
YES _1

TURN INDUCER ON FOR 1 SECOND.

IS POLARITY REVERSED?

SIGNAL HOLDS"
UNTIL UNIT IS

I-_=-I

I
SIGNAL POLARITY REVERSED AT LED.

IS VOLTAGE
_
PRo/SE THERoE
._I YEs-J
ABOVE 75 VOLTS? I_1
ERR
UND._

GPRRoOuPNEDRELY"
I
I

GAS VALVE OFE COMBUSTION AIR INDUCER OFR
INDOOR BLOWER OFF WITH NORMAL DELAY
SIGNAL CIRCUIT BOARD FAILURE ATLED,
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES.

ROLLOUTISSWITCH
ROLLOUT
MONITORED
SWITCH CLOSED?
CONTINUOUSLY,

I
I
I

CHECK FOR MAIN BURNER FLAME SENSE.

N_I1

'-I

IS MAIN BURNER FLAME OFF?

T
LED: SLOW FLASH RATE REMAINS UNCHANGED
THROUGHOUT COOLING CYCLE.

THERMOSTAT CALLS FOR COOLING.

I
I

COMPRESSOR CONTACTOR AND SYSTEM FAN
ENERGIZED WITH O-SECOND DELAY, ACB COOL
SPEED ENERGIZED. ACC. TERM. ENERGIZED.

THERMOSTAT OPENS.

COMPRESSOR OFF.

SYSTEM FAN AND ACC. TERM. OFF
WITH O-SECOND DELAY,

LOW VOLTAGE SIGNAL AT LET HOLDS
UNT L VOLTAGE R SES ABOVE 75 VOLTS.

Page 31

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
SEQUENCE HOLDS UNTIL FLAME IS NOT SENSED,

SURELIGHT
CONTROL
CONTINUOUS
FANSEQUENCE
OFOPERATION
I

LED: SLOW THROUGHOUT
FLASH RATE REMAINS
UNCHANGED
SEQUENCE,

MANUAL

FAN SELECTION

MADE AT THERMOSTAT,

CONTROL (G) ENERGIZES INDOOR BLOWER AT
ACB LOW SPEED. ACC. TERM. S ENERG ZED

T.ERMOSTATCA,LSFORHEAT_W_
i--'1%_O_"_%_g"_'_
S
_¥ES

SPEED AFTER NORMAL DELAY.

I,NDOOR
BLO RBW,TCHESTOAOB
COOLSPE,D
I

THERMOSTAT OPENS. COMBUSTION A]R INDUCER
I

THERMOSTAT OPENS.

I
Job Name
Job Location
Installer
Unit Model Number

AND HTG ACC. TERMINAL ARE DE-ENERG ZED.

i
INDOOR BLOWER SELECTED TIME OFF DELAY BEGINS, I
AFTER DELAY ACB HEAT SPEED DE-ENERGIZED.
(blower remains energized during continuousfan mode).
I

INDOOR BLOWER SWITCHES TO ACB LOW
SPEED. ACC. TERM. REMAINS ENERGIZED.

Job Number
City
City
Serial Number

Date
State/Province
State/Province
Service Technician

HEATING SECTION
Electrical Connections Tight? []
Supply Voltage
Blower Motor Amps
Blower Motor HorsepowedkW
Blower Motor LubricationOK?[]
Gas PipingConnectionsTight & Leaks Tested?•
Fuel Type: Natural Gas? []
Furnace Btu (kW) Input.
Line Pressure
Regulator Pressure w.c./Pa - Nat,
Air Shutters Propedy Adjusted (If Installed)?•
Connections "right?[]
Proper Draft?
Fan Control Setting (45 Seconds Fixed On)
Fan Control Off Setting.
Temperature Rise
Filter Clean & Secure?o
Vent Clear?.O
TH ERMOSTAT
Calibrated'Z3

Heat Anticipator Properly Set? o

Page 32

Level?r't

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Page Layout                     : SinglePage
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Producer                        : Goby Monitor Application version 3, 2, 1, 4
Create Date                     : Fri Apr 20 14:20:08 2007
Author                          : 
Title                           : 
Subject                         :

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Lennox International Inc G32Q3 100 Users Manual

LENNOX Furnace/Heater, Gas Manual L0406281 LENNOX Furnace/Heater, Gas Owner's Manual, LENNOX Furnace/Heater, Gas installation guides

G32Q4-125 to the manual 1dda99e3-c02f-41a4-9ac6-bf528d8ebe00

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