Goodman GMEC96 Service Instructions Manual page 63

SERVICING
6. Turn on power and close thermostat "R" and "W1"
contacts to provide a call for low stage heat.
7. Measure the gas manifold pressure with burners fir-
ing. Adjust manifold pressure using the Manifold Gas
Pressure table shown below.
8. Remove regulator cover screw from the low (LO) out-
let pressure regulator adjust tower and turn screw
clockwise to increase pressure or counterclockwise
to decrease pressure. Replace regulator cover
screw.
9. Close thermostat "R", "W1" and "W2" contacts to pro-
vide a call for high stage heat.
10. Remove regulator cover screw from the high (HI) out-
let pressure regulator adjust tower and turn screw
clockwise to increase pressure or counterclockwise
to decrease pressure. Replace regulator cover
screw.
11. Turn off all electrical power and gas supply to the
system.
12. Remove the manometer hose from the hose barb fit-
ting or outlet pressure tap.
13. Replace outlet pressure tap:
White-Rodgers 36J54 valve: 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 sys-
tem.
15. Close thermostat contacts "R" and "W1/W2" to ener-
gize the valve.
Manifold Gas Pressure
Gas
Natural Low Stage
High Stage
Propane Low Stage
High Stage
Using a leak detection solution or soap suds, check for leaks at
outlet pressure tap plug (Honeywell valve) or screw (White-Rodg-
ers valve). Bubbles forming indicate a leak. SHUT OFF GAS
AND REPAIR ALL LEAKS IMMEDIATELY!
NOTE: For gas to gas conversion, consult your dealer for ap-
propriate conversion.
CAUTION
T
O 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.
Range Nom inal
1.6 - 2.2" w .c. 1.9" w .c.
3.2 - 3.8" w .c. 3.5" w .c.
5.7 - 6.3" w .c. 6.0" w .c.
9.7 - 10.3" w .c. 10.0" w .c.
Regulator
Vent
Gas Valve On/Off
Selector Switch
Honeywell Model VR9205 (Two-Stage)
Measuring Gas Pressure: Two-Stage Valves Cont'd
i
Outlet Pressure Tap
1/8 NPT
Honeywell Model VR9205 Connected to Manometer
1. Remove regulator cover screw from the low (LO) outlet
pressure regulator adjust tower and turn screw clock-
wise to increase pressure or counterclockwise to de-
crease pressure. Replace regulator cover screw.
a. Close thermostat "R" and "W" contacts to provide a
call for heat.
b. Remove regulator cover screw from the high (HI) out-
let pressure regulator adjust tower and turn screw
clockwise to increase pressure or counterclockwise
to decrease pressure. Replace regulator cover screw.
c. Turn off all electrical power and gas supply to the
system.
d. Remove the manometer hose from the outlet pres-
sure boss.
High Fire
Regulator
Adjust
Low Fire
Regulator
Adjust
Common
Terminal(C)
High Fire Coil
Terminal (HI)
Low Fire Coil
Terminal (LO)
Inlet Pressure Tap
1/8 NPT
63