Goodman MH8 Installation Instructions Manual page 27

INLET
Gas Valve On/Off
Selector Switch
White-Rodgers Model 36G54 (Two-Stage)
Open to
Atmosphere
Outlet
Pressure Boss
Inlet
Pressure
Boss
White-Rodgers Model 36G54 Connected to Manometer
Regulator
Vent
Gas Valve On/Off
Selector Switch
Honeywell Model VR9205 (Two-Stage)
S
OUTLET
High Fire Regulator
Adjust
Regulator
Vent
Low Fire
Regulator
Adjust
Common
Terminal(C)
High Fire
Regulator
Adjust
Low Fire
Regulator
Adjust
- P
TART UP ROCEDURE AND
i
Outlet Pressure Tap
1/8 NPT
Honeywell Model VR9205 Connected to Manometer
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at either the gas valve inlet pressure
boss or the gas piping drip leg. See Honeywell VR9205
gas valve figure or White-Rodgers 36G54 gas valve figure
for location of inlet pressure boss.
NOTE: If measuring gas pressure at the drip leg or Honeywell
VR9205 gas valve, a field-supplied hose barb fitting must be
installed prior to making the hose connection. If using the inlet
pressure boss on the White-Rodgers 36G54 gas valve, then
use the 36G Valve Pressure Check Kit, Goodman Part No.
0151K00000S.
3. Turn ON the gas supply and operate the furnace and all
other gas consuming appliances on the same gas supply
line.
4. Measure furnace gas supply pressure with burners firing.
Supply pressure must be within the range specified in
the Inlet Gas Supply Pressure table.
Inlet Gas Supply Pressure
Natural Gas
Minimum: 5.0" w.c.
Minimum: 11.0" w.c.
Propane Gas
If supply pressure differs from table, make the necessary ad-
justments to pressure regulator, gas piping size, etc., and/or
consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve and
disconnect manometer. Reinstall plug before turning on
gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in
step 3.
27
A
DJUSTMENT
Common
Terminal(C)
High Fire Coil
Terminal (HI)
Low Fire Coil
Terminal (LO)
Inlet Pressure Tap
1/8 NPT
Maximum:10.0" w.c.
Maximum:13.0" w.c.