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CAUTION
To prevent unreliable operation or equipment damage,
Goodman 61
the inlet gas supply pressure must be as specified on the
unit rating plate with all other household gas-fired
appliances operating.
IMPORTANT:
The furnace input rate must not exceed the input rating on
the furnace rating plate.
This furnace is equipped for rated input at manifold pressures
of 1.7" (4.32 cm) W.C. (1
(2
nd
stage) for Natural gas. When an LP conversion kit is used,
it is equipped for rated input at manifold pressures of 4.9"
CAUTION
To prevent unreliable operation or equipment damage,
Goodman 65
the gas manifold pressure must be as specified on the
unit rating plate. Only minor adjustments should be made
by adjusting the gas control valve pressure regulator.
For Altitudes 4,500 to 7,500 ft (1,371.6 m to 2,286 m)
Above Sea Level
Gas Control Valve
A
K
L
A. Open to atmosphere
E. Regulator vent
B. Manometer hose
F. Low-fire regulator
adjust
C. Outlet pressure boss
G. Coaxial coil terminal (M)
D. High-fire regulator
adjust
H. Common terminal (C)
Only small variations in gas pressure should be made by
adjusting the gas control valve pressure regulator. The manifold
pressure must be measured with the burners operating. To
measure and adjust the manifold pressure, use the following
procedure.
1. Turn off the gas to the furnace at the manual gas shutoff valve
external to the furnace.
2. Turn off all electrical power to the system.
Check the Furnace Input Rate
st
stage) and 3.5" (8.89 cm) W.C.
Adjust the Furnace Input Rate
B
C
D
J
I
H
G
I. High-fire coil
terminal (HI)
J. ON/OFF switch
K. Inlet pressure boss
L. Manometer
(if required)
(12.45 cm) W.C. (1
(2
nd
stage) for propane gas.
For Natural gas, check the furnace rate by observing the gas
meter, making sure all other gas appliances are turned off.
The test hand on the meter should be timed for at least one
revolution.
Btu/h
=
Input
# Seconds per Revolution
At altitudes from 2,000 to 7,500 ft (609.6 m to 2,286 m) the
furnace input rate must not exceed that on the rating plate.
NOTE: The actual heating value of your gas can be obtained from
your local utility company. Typical values are shown in the
Manifold Pressure vs. Altitude Chart in "Adjust the Furnace Input
Rate."
(if required)
3. Loosen the outlet pressure test screw (inlet/outlet pressure
boss) 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 the power and energize the main (M) solenoid.
NOTE: Do not energize the (HI) solenoid.
7. Measure the gas manifold pressure with the burners firing.
8. Adjust the manifold pressure using the following Manifold
Gas Pressure table.
9. Remove the regulator cover screw from the low (LO) outlet
pressure regulator adjust tower and turn the screw clockwise
to increase pressure, or counterclockwise to decrease
pressure.
10. Energize the main (M) solenoid as well as the (HI) terminal.
11. Remove the regulator cover screw from the (HI) outlet
pressure regulator adjust tower and turn the screw clockwise
to increase pressure, or counterclockwise to decrease
E
pressure.
12. Turn off all electrical power and gas supply to the system.
13. Remove the manometer hose from the outlet pressure boss.
14. Tighten the outlet pressure test screw to seal pressure port
F
(clockwise, 7 in-lb minimum).
15. Turn on the electrical power and gas supply to the system.
16. Turn on the system power and energize the gas control valve.
17. Using a leak detection solution or soap suds, check for leaks
at the pressure boss screw. Bubbles forming indicate a leak.
IMPORTANT: If a leak is found, turn off gas and fix all leaks
immediately.
NOTE: For gas-to-gas conversion, consult your dealer for the
appropriate conversion.
Manifold Gas Pressure
Gas
Rate
Natural
Low Stage
High Stage
Propane
Low Stage
High Stage
st
stage) and 10.0" (25.4 cm) W.C.
Cu. ft per Revolution
x 3600 x Heating
Range
1.7" to 2.3" W.C.
3.2" to 3.8" W.C.
5.7" to 6.3" W.C.
9.7" to 10.3" W.C. 10.0" W.C.
Value
Nominal
2.0" W.C.
3.5" W.C.
6.0" W.C.
33
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