G21 Combustion Components; Gsr21 Combustion Components - Lennox G21Q3-40 Unit Information

COMBUSTION
EXHAUST OUTLET MANIFOLD
RUBBER ISOLATION MOUNTS (4)
COIL INLET MANIFOLD
EXHAUST DECOUPLER
COMBUSTION CHAMBER
DRAIN PLUG
Combustion Procedure in G21/GSR21 Units:
1 − Gas flows through the valve, expansion tank, flapper
valve and orifice into the combustion chamber.
2 − Air flows through the air flapper valve and directly into
the combustion chamber. Spark occurs.

G21 COMBUSTION COMPONENTS

RESONATOR
CHAMBER
SENSOR
SPARK PLUG

GSR21 COMBUSTION COMPONENTS

TAILPIPE
RESONATOR
SENSOR
SPARK PLUG
RUBBER ISOLATION MOUNTS (4)
EXHAUST DECOUPLER
TAILPIPE
VALVE BODY & AIR FLAPPER VALVE ASSEMBLY
AIR INTAKE MANIFOLD
CONDENSER COIL
FIGURE 30
AIR INTAKE MANIFOLD
FIGURE 31
3 − Combustion takes place and exhaust gas flows
through the tailpipe, exhaust decoupler and condenser
coil to the exhaust outlet.
Page 28
GAS VALVE
EXPANSION
TANK
ORIFICE (INSIDE)
PRESSURE TAP
ELBOW
GAS INTAKE MANIFOLD &
FLAPPER VALVE ASSEMBLY
RUBBER ISOLATION MOUNTS (4)
EXHAUST OUTLET MANIFOLD
CONDENSER COIL
GAS VALVE
EXPANSION TANK
PRESSURE TAP
ELBOW
ORIFICE (INSIDE)
GAS INTAKE MANIFOLD & FLAPPER
VALVE ASSEMBLY
VALVE BODY & AIR FLAPPER
VALVE ASSEMBLY