GMES80 Installation Manual

20
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
Gas Line
Gas
Shutoff
Valve
Gas Line
To Furnace
Drip Leg Cap
With Fitting
Manometer Hose

Gas Manifold Pressure Measurement and
Adjustment
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
GAS
MANIFOLD
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
. O
NLY
MINOR
ADJUSTMENTS
SHOULD
BE
MADE
BY
ADJUSTING
THE
GAS
VALVE
PRESSURE
REGULATOR
.
CAUTION
HIGH VOLTAGE !
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
. M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
This valve is shipped from the factory with the regulator preset
(see control label).
Consult the appliance rating plate to ensure burner manifold
pressure is as specied. If another outlet pressure is required,
follow these steps.
1. Turn OFF gas to furnace at the manual gas shuto󰀨
valve external to the furnace.
2. Turn OFF all electrical power to the system.
3. Outlet pressure tap connections:
White-Rodgers valve:
Back outlet pressure test screw (outlet pressure tap)
out one turn (counterclockwise, not more than one
turn).
4. Attach a hose and manometer to the outlet pressure
tap.
5. Turn ON the gas supply.
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
INLET
OUTLET
Inlet Pressure
Tap
Outlet Pressure
Tap
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1. Turn OFF gas to furnace at the manual gas shuto󰀨
valve external to the furnace.
2. Turn OFF all electrical power to the system.
3. Inlet pressure tap connections:
White-Rodgers valve:
Back inlet pressure test screw (inlet pressure tap )
out one turn (counterclockwise, not more than one
turn).
4. Attach a hose and manometer to the inlet pressure tap
(White-Rodgers valve).
5. Turn ON the gas supply.
6. Turn On power and close thermostat “R” and “W”
contacts to provide a call for heat.
7. Using a leak detection solution or soap suds to check
for leaks at outlet pressure tap plug Bubbles forming
indicate a leak. SHUT OFF GAS AND REPAIR ALL
LEAKS IMMEDIATELY!
8. Measure the gas supply pressure with burners ring.
Adjust supply pressure using the Inlet Gas Supply
Pressure table shown below. If supply pressure reading
di󰀨ers from the table, make necessary adjustments to
pressure regulator, gas piping size, etc., and/or consult
with local gas utility.
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c.
Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
9. Turn OFF all electrical power and gas supply to the
system.
10. Remove the manometer hose from the hose barb tting
or inlet pressure tap.
11. Replace inlet pressure tap:
White-Rodgers valve:
Turn inlet pressure test screw in to seal pressure port
(clockwise, 7 in-lb minimum).
12. Retest for leaks. If bubbles form, shut down gas and
repair leaks immediately.
13. Turn ON electrical power and gas supply to the system.
14. Turn valve switch ON.