Lennox G21Q3-40 User Manual

Page 52
AIR FLAPPER VALVE ASSEMBLY−40/50/60/80
VALVE BODY
THERMOPLASTIC
ELASTOMER
NUT
BACK PLATE
PPS THERMOPLASTIC
OR STAINLESS STEEL
FLAPPER
SPACER
FRONT
PLATE
COVER SCREWS (8)
TORQUE TO 15 + IN. LBS.
SCREW
TORQUE TO
9 + 1 INLBS.
PPS
THERMOPLASTIC
BUSHING
GASKET
FIGURE 70
STAINLESS STEEL BACKPLATE:
STAMP AND STAR MUST
FACE AWAY FROM FLAPPER
PPS THERMOPLASTIC BACK PLATE:
GROOVE MUST FACE TOWARDS FLAPPER.
FRONT PLATE;
STAMP AND STAR MUST FACE
AWAY FROM FLAPPER.
IMPORTANT
Special screws are used in the air flapper valve.
Replacement screws are available in kit form from
Lennox Repair Parts. Do not use Loctite or similar
thread seizing compounds to secure screws.
WARNING
When servicing the air intake flapper valve, keep
in mind that it is only moderately warm during unit
operation. After unit cycles off, residual heat in
combustion chamber will transfer back to valve
causing it to become very hot. Allow it to cool 10
to 15 minutes before handling. The blower can
also be run to cool air intake.
FIGURE 71
VALVE BODY
THERMOPLASTIC
ELASTOMER
BACK
PLATE
FLAPPER
COVER
SCREWS
(8)
SCREW
TORQUE TO
10 + 1 INLBS.
STAMPS IN SAME
QUADRANT AND
FACING AWAY
FROM UNIT
NUT
CENTER
PLATE
PPS
THERMOPLASTIC
BUSHING
GASKET
AIR FLAPPER VALVE ASSEMBLY
G21Q−100−5 to −8 & G21V−100−7, −8
SPACER
HOLES SHOULD LINE UP BE
TWEEN THE CENTER PLATE AND
THE FRONT PLATE
FRONT
PLATE
AIR FLAPPER VALVE ASSEMBLY−100
VALVE BODY
THERMOPLASTIC
ELASTOMER
BACK
PLATE
FLAPPER
COVER
SCREWS
(8)
SCREW
TORQUE TO
10 + 1 INLBS.
CLEARANCE
CLEARANCES ARE SUBJECT TO CHANGE.
REFER TO LENNOX REPAIR PARTS OR SER
VICE AND APPLICATION NOTES HEATING
TAB FOR LATEST INFORMATION.
STAMPS IN SAME
QUADRANT AND
FACING AWAY
FROM UNIT
QUADRANTS
NUT
CENTER
PLATE
DIMENSION "A"
PPS
THERMOPLASTIC
BUSHING
GASKET
FIGURE 72
CORK GASKET

Lennox G21Q3-40 Specifications

General

Brand	Lennox
Model	G21Q3-40
Category	Industrial Equipment
Language	English