16
18-CE15D1-1C-EN
Gas Valve Adjustment
Note:
The gas valve supplied with this unit has been calibrated
specifically for the Ultra Lo-NOx ignition system. Adjustment is
not typically necessary.
Manifold pressure adjustments are only recommended when there are
ignition light-off, flame stabilization, or tonal issues with the furnace.
To adjust the manifold pressure:
1.
Turn off all electrical power to the system.
2.
Attach a manifold pressure gauge with flexible tubing to the outlet
pressure boss marked "OUT P" on White- Rodgers gas valve
model 36J.
3.
Loosen (Do Not remove) the pressure tap test set screw one turn
with 3/32" hex wrench.
a.
The pressure tap adjustment kit (KIT07611) contains a 3/32"
hex wrench, a 5/16" hose and a connector and can be
ordered through Global Parts.
4.
Turn on system power and make a call for heating.
5.
To adjust the run manifold pressure, remove the high (HI)
adjustment regulator cover screw.
a.
To increase outlet pressure, turn the regulator adjust screw
clockwise.
b.
To decrease outlet pressure, turn the regulator adjust screw
counterclockwise.
c.
Adjust regulator until pressure shown on manometer
matches the pressure specified in the table.
The input of no more than nameplate rating and no less than
93% of the nameplate rating, unless the unit is derated for
high altitude.
d.
Replace and tighten the regulator cover screw securely.
6.
To adjust the light off manifold pressure, remove the low (LO)
adjustment regulator cover screw.
a.
To increase outlet pressure, turn the regulator adjust screw
clockwise.
b.
To decrease outlet pressure, turn the regulator adjust screw
counterclockwise.
c.
Adjust regulator until pressure shown on manometer
matches the pressure specified in the table.
The input of no more than nameplate rating and no less than
93% of the nameplate rating, unless the unit is derated for
high altitude.
d.
Replace and tighten the regulator cover screw securely.
7.
Cycle the furnace several times to verify regulator setting.
a.
Repeat steps 5-7 if needed.
8.
Turn off all electrical power to the system.
9.
Remove the manometer and flexible tubing and tighten the
pressure tap screw.
10. Using a leak detection solution or soap suds, check for leaks at the
pressure outlet boss and pressure tap test screw.
11. Turn on system power and check operation of the unit.
Outlet Pressure Boss
Run Stage (HI) Manifold Pressure Adjustment
Light Off (LO) Manifold Pressure Adjustment
Inlet Pressure
Boss
Gas Valve On/Off
Toggle Switch
White-Rodgers 36J
Maximum and Minimum INLET Pressure (inches w.c.)
Natural Gas
Maximum
13.8
Minimum
5
Recommended Fuel Manifold Settings (inches w.c.)
L8V1A040U3VS
2.1" Light-Off (LO) /
3.0" Run (HI)
L8V1A060U3VS
L8V1B080U4VS
L8V1C100U5VS
Orifice sizes for Natural Gas
L8V1A040U3VS
3.2 mm
L8V1A060U3VS
#23
L8V1B080U4VS
#15
L8V1C100U5VS
#11
Note:
Adjust RUN / (HI) manifold pressure to ~ 2.7" if high pitch
combustion sound develops.
