Goodman *MH8 Installation Instructions Manual page 25

HIGH VOLTAGE !
D
ISCONNECT ALL POWER BEFORE
. M
INSTALLING THIS UNIT ULTIPLE
. F
BE PRESENT AILURE TO DO SO
,
DAMAGE PERSONAL INJURY OR
M M M M M S S S S S S S S S S G G G G G
ODELS ODELS ODELS USING USING USING USING INGLE INGLE INGLE TAGE TAGE TAGE
ODELS ODELS USING INGLE INGLE TAGE TAGE
This valve is shipped from the factory with the regulator preset (see
control label).
Consult the appliance rating plate to ensure burner manifold pres-
sure is as specified. If another outlet pressure is required, follow
these steps.
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. Outlet pressure tap connections:
a. Honeywell VR8215 valve:
Remove the outlet pressure boss plug. Install an 1/8" NPT
hose barb fitting into the outlet pressure tap.
b. White-Rodgers 36G22 valve:
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 barb
fitting (Honeywell valve) or outlet pressure boss (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, check for leaks
at outlet pressure boss plug (Honeywell valve) or screw
(White-Rodgers valve). Bubbles forming indicate a leak. SHUT
OFF GAS AND REPAIR ALL LEAKS IMMEDIATELY!
8. Measure the gas manifold pressure with burners firing. Adjust
manifold pressure using the Manifold Gas Pressure table
shown below.
Manifold Gas Pressure
Natural Gas
Propane Gas
9. Remove regulator cover screw from the outlet pressure
regulator and turn screw clockwise to increase pressure or
counterclockwise to decrease pressure. Replace regulator
cover screw.
10. Turn OFF all electrical power and gas supply to the system.
11. Remove the manometer hose from the hose barb fitting or
outlet pressure boss.
12. Replace outlet pressure tap:
a. Honeywell VR8215 valve:
Remove the 1/8" NPT hose barb fitting from the outlet
pressure tap. Replace the outlet pressure boss plug and
seal with a high quality thread sealer.
WARNING
SERVICING OR
POWER SOURCES MAY
MAY CAUSE PROPERTY
.
DEATH
V V V V V
AS AS AS ALVES ALVES ALVES
AS AS ALVES ALVES
3.5" w.c.
10.0" w.c.
S S S S S - - - - - P P P P P
T T T T T A R A R A RT T T T T A R A R U P U P U P U P U P R R R R R O C E D U R E O C E D U R E O C E D U R E O C E D U R E O C E D U R E A N D
b. White-Rodgers 36G22 valve: Turn outlet pressure test
screw in to seal pressure port (clockwise, 7 in-lb
minimum).
13. Turn ON electrical power and gas supply to the system.
14. Close thermostat contacts to provide a call for heat.
15. Retest for leaks. If bubbles form, SHUT OFF GAS AND REPAIR
ALL LEAKS IMMEDIATELY!
M M M M M T T T T T S S S S S
ODELS USING ODELS ODELS ODELS ODELS USING USING USING USING WO WO WO WO WO TAGE TAGE TAGE TAGE TAGE
T
O PREVENT UNRELIABLE OPERATION
GAS MANIFOLD PRESSURE
. O
PLATE NLY MINOR ADJUSTMENTS
THE GAS VALVE PRESSURE
Only small variations in gas pressure should be made by adjusting
the gas 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 gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
a. Honeywell VR9205 valve: Remove the outlet pressure boss
plug. Install an 1/8" NPT hose barb fitting into the outlet
pressure tap.
b. White-Rodgers 36G54 valve: Back outlet pressure test
screw (inlet/outlet pressure boss) out one turn
(counterclockwise, not more than one turn).
4. Attach a hose and manometer to the outlet pressure barb
fitting (Honeywell valve) or outlet pressure boss (White-
Rodgers valve).
5. Turn ON the gas supply.
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 firing. Adjust
manifold pressure using the Manifold Gas Pressure table
shown below.
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.
Replace regulator cover screw.
9. Close thermostat "R" and "W2" contacts to provide a call for
high stage heat.
10. Remove regulator cover screw from the high (HI) outlet
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 fitting or
outlet pressure boss.
13. Replace outlet pressure tap:
a. Honeywell VR9205 valve: Remove the 1/8" NPT hose barb
fitting from the outlet pressure tap. Replace the outlet
25
A A A A A
A N D A N D A N D A N D D J US T M E N T D J U D J U D J U D J U
G G G G G V V V V V
AS AS AS AS AS ALVES ALVES ALVES ALVES ALVES
CAUTION
OR EQUIPMENT DAMAGE
MUST BE AS SPECIFIED ON THE UNIT
SHOULD BE MADE BY
.
REGULATOR
S T M E N T S T M E N T S T M E N T S T M E N T
,
THE
RATING
ADJUSTING