LENNOX Furnace/Heater, Gas Manual L0806824

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

Open the PDF directly: View PDF PDF.
Page Count: 3

DownloadLENNOX Furnace/Heater, Gas Manual L0806824
Open PDF In BrowserView PDF
LENNOX
© 2004 Lennox Industries Inc_
Dallas, Texas, USA

INSTALLATION
INSTRUCTIONS
(47M55, 57M85 AND 83M56)

GAS UNITS
KITS AND ACCESSORIES
504,976M
10/04
Supersedes

504,768M

z]_b,=io..
LithoU.S.A.

COMBUSTION AIR INDUCER
REPLACEMENT
KIT

FOR COMBUSTION
AIR INDUCER
USED WITH G41UF, G43UF, G51MP

REPLACEMENT
KITS
& G61MP(V) UNITS

A CAUTION
Package 1 of 1 contains the following:
1 - Combustion air inducer
1 - Gasket

Combustion air inducer replacement kits 47M55, 57M85
and 83M56 are used with units as detailed below.
Unit Model Number
G41UF
G43UF-045

Kit Number
47M55

G43UF-070
G43UF-090-01, -02

47M55

2. Remove the upper access panel on the furnace.
3. Disconnect the elecbical power wiring harness from
the combustion air inducer. Disconnect the ground
wire.
4. Loosen the hose clamp that secures the combustion
air inducer to the flue tee assembly (see figure 1).

G43UF-110-01, -02, -03
G43UF-135-01, -02, -03
G43UF-090-03, -04
G43UF-110-04

1. Set the thermostat to the lowest setting. Shut off the
gas supply to the furnace; then disconnect the
electrical power.

83M56
G41UF Combustion

G43UF-135-04

Air Inducer

Assembly

G51MP-045
G51MP-070
G51MP-090-01, -02

47M55
FLUE TEE

G51 MP-110-01, -02

COLLECTOR
BOX

G51 MP-135-01, -02
G51 MP-090-03, -04
G51MP-110-03

I

83M56

G51MP-135-03
G61MP(V)

HOSE
CLAMP

57M85

I
!

/

BACKUP
("_,=_ /
SECONDARY
GASKET

WARNING

LIMIT __
SCREWS
COMBUSTION
AIRINDUCER

Figure

10/04

I]IMII]IIIMIMIIIIIIIIII

1

504,976M

Pogel

IIMIIflMMMH

G43UF / G51MP

Combustion

5. G43UF, G51MP and G61MP(V) Units Only -Combustion air pressure proving switches are secured
to combustion air inducer. Disconnect tubing from
pressure switches. Remove screws which secure
pressure switches to existing combustion air inducer
(see figures 2 and 3). Set pressure switches aside for
re-installation.

Air Inducer

Assembly

COLLECTOR
BOX

FLUE TEE j

.

HOSE
CLAMP
BACKUP
SECONDARY

"_
/_'t_
/
I

7. Remove four screws which secure the combustion air
inducer to the collector box and remove the
combustion air inducer from the furnace (see figures 1,
2 and 3).

LIMIT & SCREW//

/

8. Remove the gasket from the front of the collector box.
Install the replacement gasket before installing the
replacement inducer.

/

/
PRESSURE
SWITCHES &
SCREWS

SCREWS

9. Use the existing screws to secure the replacement
combustion air inducer to the collector box. Use a
torque wrench to tighten screws to 30 in. Ibs. (339
N-cm).

AIR INDUCER

(4)

10. Use the existing screw to re-install the existing backup
secondary limit on the replacement combustion air
inducer. Use a torque wrench to tighten the screw to 5
in. Ibs. (56 N-cm).

NOTE: Parts configuration shown does not
reflect all mode/s.
Figure
G61MP(V)

Remove the screw which secures the backup
secondary limit to the combustion air inducer. Remove
the limit and set it aside for re-installation.

2

Combustion
Assembly

11. G43UF, G51MP and G61MP(V) Units Only -- Use
existing screws to re-install existing combustion air
pressure
proving
switches
on
replacement
combustion air inducer housing. Use a torque wrench
to tighten screws to 15 in. Ibs. (169 N-cm).

Air Inducer
FLUE
COLLECTOR
BOX

BACKUP
SECONDARY
LIMIT & SCREW

i

WARNING

i

SCREWS

_
TUBING

GASKET

/
/

//
_:_

\

_

/
/

COMBUSTION

12. Re-attach the pressure switch tubing as shown in
figures 4 and 5).

AIRINDUCER

13. Use existing hose clamp to secure replacement
combustion air inducer to flue tee assembly.
(2SWITCHES

PERASS_

NOTE: Parts configuration
models.

TUBING

14. Connect existing wiring harness
inducer and reconnect ground wire.

shown does not reflect all

to replacement

15. Restore electrical power and gas supply to the fumace.
16. Refer to the unit installation instructions
start-up procedure.

Figure 3

Page 2

for proper

Pressure

Switch / Collector
COLLECTOR

Box Tubing

Circuitry

for G43UF / G51MP

COLLECTOR BOX POSITIVE
PRESSURE TAPS

BOX NEGATIVE
PRESSURE

Units

TAP
FLUE COLLECTOR

BOX

9" RED TUBING
/

collector box negative tap)

J

/

9" BLACK TUBING

/

COLLECTOR BOX NEGATIVE
PRESSURE TAP

9" RED TUBING
(pressure switch rear barb to
collector box negative tap)

(pressure switch front barb to
collector box positive tap)

Figure 4
Pressure

Switch I Collector

COLLECTOR

Box Tubing

BOX NEGATIVE
PRESSURE TAP

4-1/2" BLACK TUBING

\

Circuitry

for G61MP(V)

Unit

COLLECTOR BOX POSITIVE
PRESSURE TAPS

FLUE COLLECTOR

BOX

(minus tap on low fire
minus tap on high fire pressure switch)

J_

9" RED TUBING

._
/

collector box negative tap)

J

9" BLACK TUBING
(pressure switch front barb to
collector box positive tap)

COLLECTOR BOX NEGATIVE
PRESSURE TAP

(plus tap on low fire pressure switch to
plus tap on high fire pressure switch)

I/2" BLACK TUBING
(minus tap on low fire pressure switch to minus tap on
high fire pressure switch)

COMBUSTION AIR PRESSURE
SWITCH ASSEMBLIES

9" RED TUBING

4-1/2" BLACK TUBING
(plus tap on low fire pressure switch to
plus tap on high fire pressure switch)

9" BLACK TUBING
(pressure switch front barb to
collector box positive tap)

Figure 5

Page 3

(pressure switch rear barb to
collector box negative tap)
Source Exif Data: 
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : No
Page Count                      : 3
Page Layout                     : SinglePage
Page Mode                       : UseNone
Producer                        : Goby Monitor Application version 4, 0, 0, 13
Create Date                     : Sun Jul 20 21:08:01 2008
Author                          : 
Title                           : 
Subject                         :
EXIF Metadata provided by EXIF.tools

Navigation menu