GPG16M Installation Instructions

15
Gas Inlet Pressure Check
Gas inlet pressure must be checked and adjusted in accordance
to the type of fuel being consumed.
With Power And Gas Off:
1. Back inlet pressure test screw (inlet pressure boss) out one
turn (counterclockwise, not more than one turn).
Alternately, inlet gas pressure may be measured by removing
the cap from the drip leg and installing a predrilled cap with
a hose barb fitting.
2. Connect a water manometer or adequate gauge to the inlet
pressure tap of the gas valve (or hose barb fitting on
predrilled cap).
With Power And Gas On:
3. Put unit into heating cycle and turn on all other gas
consuming appliances.
Natural Min. 5.0" W.C., Max. 10.0" W.C.
Propane Min. 11.0" W.C., Max. 13.0" W.C.
INLET GAS PRESSURE
NOTE: Inlet Gas Pressure Must Not Exceed the Maximum Value Shown. If operating
pressures differ from above, make necessary pressure regulator adjustments, check
piping size, etc., and/or consult with local utility.
4. Turn off all electrical power and gas supply to the system.
5. Remove manometer hose from the outlet pressure boss (or remove hose from
hose barb).
6. Turn inlet pressure test screw in to seal pressure port (clockwise, 7 in-lb minimum).
Alternately, remove predrilled cap from drip leg. Reinstall original cap, sealing with
pipe thread compound.
7. Turn on electrical power and gas supply to the system.
8. Turn on system power and energize valve.
9. Using a leak detection solution or soap suds, check for leaks at the pressure boss
screw (or drip leg cap). Bubbles forming indicate a leak. SHUT OFF GAS AND FIX
ALL LEAKS IMMEDIATELY.
Manifold Pressure Check
1 Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace.
2. Turn off all electrical power to the system.
3. Back outlet pressure test screw (outlet pressure boss) out one turn (counterclockwise,
not more than one turn).
4. Attach a hose and manometer to the outlet pressure boss of the valve.
5. Turn ON the gas supply.
6. Turn on power and energize main (M) solenoid. Do not energize the HI solenoid.
7. Measure gas manifold pressure with burners firing. Adjust manifold pressure using
the Manifold Gas Pressure table.
8. Remove regulator cover screw from the low (LO) outlet pressure regulator adjust
tower and turn screw clockwise to increase pressure, or counterclockwise to decrease
pressure.
9. Energize main (M) solenoid as well as the HI terminal.
10. Remove regulator cover screw from the HI outlet pressure regulator
adjust tower and turn screw clockwise to increase pressure, or
counterclockwise to decrease pressure.
11. Turn off all electrical power and gas supply to the system.
12. Remove manometer hose from outlet pressure boss.
13. Turn outlet pressure test screw in to seal pressure port (clockwise, 7 in-
lb minimum).
14. Turn on electrical power and gas supply to the system.
15. Turn on system power and energize valve.
16. Using a leak detection solution or soap suds, check for leaks at pressure
boss screw. Bubbles forming indicate a leak. SHUT OFF GAS AND FIX ALL
LEAKS IMMEDIATELY.
NOTE: For Natural gas to LP gas conversion, consult your dealer for appropriate conversion kit(s).
On/Off Switch
Inlet
Pressure Boss
High Fire
Coil Terminal (HI)
Low Fire
Regulator Adjust
M
a
n
o
m
e
t
e
r
M
a
n
o
m
e
t
e
r
H
o
s
e
A
High Fire Regulator
Adjust
Regulator
Vent
Common
Terminal (C)
Coaxial Coil
Terminal (M)
Outlet
Pressure Boss
Open to
Atmosphere
White-Rodgers Model 36G54 connected to Manometer
Gas Line
Gas
Shutoff
Valve
Gas Line
To Furnace
Drip Leg Cap
With Fitting
Manometer Hose
Manometer
Open To
Atmosphere
Measuring Inlet Gas Pressure
Alternate Method
Range Nominal
Low Stage 1.7 - 2.3" w.c. 2.0" w.c.
High Stage 3.2 - 3.8" w.c. 3.5" w.c.
Low Stage 5.7 - 6.3" w.c. 6.0" w.c.
High Stage 9.7 - 10.3" w.c. 10.0" w.c.
Gas
Manifold Gas Pressure
Natural
Propa ne
Manifold Gas Pressure