Lennox G21Q Series Unit Information

Page 25
FIGURE 23
GAS VALVE AND EXPANSION TANK
GAS
VALVE
MANUAL
ONOFF
KNOB
REGULATOR
ADJUSTMENT
SCREW
DUST COVER
EXPANSION
TANK
FLOW
TERMINAL CONNECTIONS
ORANGE
ORANGE
YELLOW
BROWN JUMPER
UNITS WITH
WHITE RODGERS
GAS VALVE
UNION
PRESSURE TAP
UNITS WITH
ROBERTSHAW
GAS VALVE
HAVE NO
JUMPER
ELBOW
A.G.A. / C.G.A. GSR21100 units are not shipped with the re
quired components for field conversion to LP gas. An optional
LP gas changeover kit is available from Lennox Repair Parts.
G21 (upflow) units are not shipped with the required compo
nents for field conversion to LP gas. An optional LP change
over kit is available from Lennox Repair Parts.
The kit includes one orifice, one gas valve conversion kit with
heavy spring, one air diaphragm assembly (if necessary with
that model) and changeover nameplate.
The following is a general guide for conversion to LP Refer to
the instructions provided in each specific kit for proper installa
tion procedures.
The existing gas orifice located in the elbow/gas flapper as
sembly must be removed and replaced with the orifice pro
vided in the kit. GSR21 (50,80) use orifice provided with unit.
See figure 24.
A spring behind the adjusting screw and regulator cover screw
must be replaced by a heavier spring also included in the kit.
GSR21 50 and 80 units regulator screw must be rotated so
that end labeled LP" points toward regulator. See figures 24
and 25.
In G21/GSR21100 and G2140 units the air diaphragm must
be replaced (supplied with kit). For G2160/80 and
GSR2150/80 units, use existing air diaphragm assembly.
IMPORTANT
After kit is applied, the gas manifold pressure must
be checked and properly adjusted as given in the
kit’s instructions or service and application notes.
FIGURE 24
WHITE RODGERS GAS VALVE LP CONVERSION
COMPONENTS
REPLACE NATURAL GAS
ORIFICE WITH LP ORIFICE
PROVIDED
GAS FLAPPER
VALVE ASSEMBLY
REGULATOR
SCREW COVER
ADJUSTING SCREW
SPRING
ELBOW
PRESSURE TAP
ROTATE REGULATOR
ADJUSTING SCREW
SO THAT END
LABELED LP"
POINTS TOWARD
REGULATOR
FIGURE 25
LP CHANGEOVER PROCEDURE
PLASTIC CAP
NOTE−GSR21V−100 units,
CGA units and international
units are not shipped with
components necessary for
conversion to LP gas.

Lennox G21Q Series Specifications

General

Brand	Lennox
Model	G21Q Series
Category	Industrial Equipment
Language	English