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TABLE 11
PROVE SWITCH SET POINTS
−1 to −14
Units
0 − 4500ft
(0 − 1372m)
4501’ − 7500’
1373m − 7500m
7501’ − 10,000’
(2287 − 3048m)
−045
0.47"
(116Pa)
0.36" (89Pa) 0.36" (89Pa)
−070
0.47"
(116Pa)
0.36" (89Pa) 0.36" (89Pa)
−090
0.51"
(126Pa)
0.47" (116Pa) 0.43" (106Pa)
−110 0.58" (.14Pa) 0.47" (116Pa) 0.43" (106Pa)
−135
0.51"
(126Pa)
0.47" (116Pa) 0.43" (106Pa)
−155
0.51"
(126Pa)
0.47 (116a) 0.43" (106Pa)
All −15 and
later models
0.40" (99pa) no change 0.36" (89Pa)
NOTE−− −1 to −14 units require a high altitude prove
switch kit if installed above 4500 ft (1370 m).
NOTE−− −15 and later units require a high altitude
prove switch kit if installed above 7500 ft (2286 m).
II−PLACEMENT AND INSTALLATION
Make sure unit is installed in accordance with installation
instructions and applicable codes.
III−START-UP
A−Preliminary and Seasonal Checks
1 − Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
2 − Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
B−Heating Start-Up
WARNING
Shock and burn hazard.
G40UH(X) units are equipped with a hot surface igni-
tion system. Do not attempt to light manually.
Gas Valve Operation (Figures 16, 15, 17 and 18)
1 − STOP! Read the safety information at the beginning of
this section.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5 − Remove the upper access panel.
6 − Honeywell VR8205 Gas Valve with On/Off Switch −
Move gas valve switch to OFF position. Do not
force. See figure 17.
Honeywell VR8205 Gas Valve with Control Knob −
Turn knob on gas valve clockwise
to OFF. Do not
force. See figure 18.
White Rodgers 36E/36F Gas Valve − Move gas valve
switch to OFF position.
7 − Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s instruc-
tions. If you do not smell gas go to next step.
8 − Honeywell VR8205 Gas Valve with On/Off Switch −
Move gas valve switch to ON position. Do not force.
See figure 17.
Honeywell VR8205 Gas Valve with Control Knob −
Turn knob on gas valve counterclockwise
to ON.
Do not force.
White Rodgers 36E/36F Gas Valve − Move gas valve
switch to ON position.
9 − Replace the upper access panel.
10− Turn on all electrical power to to the unit.
11− Set the thermostat to desired setting.
NOTE − When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
12− If the appliance will not operate, follow the instructions
Turning Off Gas to Unit" and call your service techni-
cian or gas supplier.
Turning Off Gas to Unit
1 − Set the thermostat to the lowest setting.
2 − Turn off all electrical power to the unit if service is to be
performed.
3 − Remove the upper access panel.
4 − Honeywell VR8205 Gas Valve with On/Off Switch −
Move gas valve switch to OFF position. Do not
force. See figure 17.
Honeywell VR8205 Gas Valve with Control Knob −
Turn knob on gas valve clockwise
to OFF. Do not
force. See figure 18.
White Rodgers 36E/36F Gas Valve − Switch gas
valve lever to OFF.
5 − Replace the upper access panel.
C−Safety or Emergency Shutdown
Disconnect main power to unit. Close manual and main gas
valves.
D−Extended Period Shutdown
Turn off thermostat or set to UNOCCUPIED" mode. Close
all gas valves (both internal and external to unit) to guaran-
tee no gas leak into combustion chamber. Turn off power to
unit. All access panels and covers must be in place and se-
cured.
IV−HEATING SYSTEM SERVICE CHECKS
A−C.S.A. Certification
All units are C.S.A. (formally A.G.A. and C.G.A. combined)
design certified without modifications. Refer to the
G40UH(X) Installation Instruction.
B−Gas Piping
Gas supply piping should not allow more than 0.5"W.C. drop
in pressure between gas meter and unit. Supply gas pipe
must not be smaller than unit gas connection.
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