Specifications

33
Check the Furnace Input Rate (if required)
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
st
stage) and 3.5" (8.89 cm) W.C.
(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"
(12.45 cm) W.C. (1
st
stage) and 10.0" (25.4 cm) W.C.
(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.
■ 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.”
Adjust the Furnace Input Rate (if required)
For Altitudes 4,500 to 7,500 ft (1,371.6 m to 2,286 m)
Above Sea Level
Gas Control Valve
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.
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
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
(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.
Goodman 61
To prevent unreliable operation or equipment damage,
the inlet gas supply pressure must be as specified on the
unit rating plate with all other household gas-fired
appliances operating.
CAUTION
Btu/h
Input
= Cu. ft per Revolution x 3600 x Heating
Value
# Seconds per Revolution
A. Open to atmosphere
B. Manometer hose
C. Outlet pressure boss
D. High-fire regulator
adjust
E. Regulator vent
F. Low-fire regulator
adjust
G. Coaxial coil terminal (M)
H. Common terminal (C)
I. High-fire coil
terminal (HI)
J. ON/OFF switch
K. Inlet pressure boss
L. Manometer
Goodman 65
To prevent unreliable operation or equipment damage,
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.
CAUTION
A
B
CD
E
F
GHIJ
K
L
Manifold Gas Pressure
Gas Rate Range Nominal
Natural Low Stage 1.7" to 2.3" W.C. 2.0" W.C.
High Stage 3.2" to 3.8" W.C. 3.5" W.C.
Propane Low Stage 5.7" to 6.3" W.C. 6.0" W.C.
High Stage 9.7" to 10.3" W.C. 10.0" W.C.