Lennox GCS16-653-75

Page 20
9-Flue Vent (Figure 15)
WARNING - VENT CAP ASSEMBLY MUST BE
INSTALLED WITHOUT MODIFICATION. ANY MOD
IFICATION TO THE VENT CAP ASSEMBLY OR
FAILURE TO INSTALL ASSEMBLY CAN RESULT
IN IMPROPER OPERATION AND WILL VOID THE
AGA/CGA CERTIFICATION OF THE UNIT.
CAUTION - DO NOT START OR OPERATE UNIT
UNLESS VENT CAP IS IN PLACE.
FIGURE 15
VENT
GASKET
VENT CAP
ASSEMBLY
TYPICAL FLUE VENT INSTALLATION
GCS16H-261/311 SHOWN
FOR ILLUSTRATION ONLY
NOT DRAWN TO SCALE
10-Burner Access Wind and Rain Shield
(Figure 16)
WARNING - THE BURNER ACCESS PANEL WIND
AND RAIN SHIELD MUST BE INSTALLED WITH
OUT MODIFICATION. IF EITHER THE BURNER AC
CESS PANEL OR WIND AND RAIN SHIELD IS NOT
INSTALLED OR IS MODIFIED, IMPROPER UNIT
OPERATION CAN RESULT AND AGA/CGA CER
TIFICATION OF UNIT WILL BE VOID.
BURNER ACCESS
PANEL
BURNER ACCESS
WIND SHIELD
SECURE WITH
FOUR SCREWS
(Provided)
UNIT
FIGURE 16
RAIN SHIELD
GCS16-410 THROUGH 650 SHOWN
TYPICAL BURNER ACCESS COVER
AND RAIN SHIELD
11-Combustion Air Blower Capacitor C3
All units equipped with 125K Btuh heat exchanger use a
singlephase PSC motor to power the combustion air
blower. A single run capacitor is mounted on the motor.
The capacitor is rated 4mfd at 370VAC.
All other heat exchanger sizes use a shaded pole motor to
power the combustion air blower. Shaded pole motors do
not require a run capacitor.
12-Gas Valve GV1
Gas valve GV1 is a singlestage redundant valve
manufactured by Honeywell. In 50,000 and 75,000 Btuh
heat exchangers, the valve is slow opening (1-10 sec
onds). 100,000 and 125,000 Btuh heat exchangers use
quick opening gas valves (1 sec. or less). On a call for
heat, the valve is energized by the ignition control simulta
neously with the spark electrode. When the valve is de
energized, it closes in 1/2 to 3 seconds. A manual shutoff
knob is provided on the valve for shutoff. Figure 17 shows
gas valve components. Table 5 shows factory gas valve
regulation for GCS16 series units.
TABLE 5
GAS VALVE REGULATION
Unit Input
K Btuh
Maximum
Inlet Pressure
in. W.C.
Operating Pressure
(outlet) in. W.C.
50
75
100
125
21.0
21.0
3.5 +0 -0.3
3.5 +0 -0.3
21.0 3.5 +0 -0.3
21.0 2.7 +0 -0.3
Natural L.P.
10.5
10.5
9.5
10.0
FIGURE 17
GAS VALVE GV1
INLET
PRESSURE
TAP
PRESSURE
REGULATOR
(under cap)
OUTLET
PRESSURE
TAP
W1
TERMINAL
C
TERMINAL
ON/OFF
KNOB
OUTLET
GROUND
TERMINALS