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30
18-CD20D3-18
Installer’s Guide
f. For the White-Rodgers gas valve model 36G:
1. Adjust low fire by removing the low adjustment
regulator cover screw (See Figure 46).
2. To increase outlet pressure, turn the regulator
adjust screw clockwise. To decrease outlet pres-
sure, turn the regulator adjust screw counterclock-
wise. Adjust regulator until pressure shown on
manometer matches the pressure specified in
Table 12.
3. Replace and tighten the regulator cover screw
securely.
4. Cycle the valve several times to verify regulator
setting.
5. Adjust high fire by removing the high adjustment
regulator cover screw (See Figure 46).
6. To increase outlet pressure, turn the regulator
adjust screw clockwise. To decrease outlet pressure,
turn the regulator adjust screw counterclockwise.
The final manifold pressure setting shall be as
specified in Table 12 with an input of no more than
nameplate rating and no less than 93% of the
nameplate rating, unless the unit is derated for
high altitude.
7. Replace high adjustment regulator cover screw and
tighten securely.
8. Cycle the valve several times to verify regulator
setting.
g. Turn off all electrical power to the system.
h. Remove the manometer and flexible tubing. Remove
the barbed fitting and replace the plug or tighten the
pressure test screw.
i. Turn on electrical power to the system and energize
valve.
j. Using a leak detection solution or soap suds, check for
leaks at plug or pressure boss screw.
NOTE:
The manifold pressure must be referenced to the burner
box. The burner box pressure tap equalizes the gas valve
pressure regulator. Manifold pressure is checked by
installing a tee (field supplied) in the tubing, between the
tee coming from the burner box tube and the gas valve, in
addition to the regular gas valve pressure tap on the outlet
side of the gas valve. See Figure 48.
▲
CAUTION
!
Replace and/or tighten all plugs removed or loosened when
adjusting gas pressure. Leak check the fittings before
placing the furnace into regular service. Failure to follow
this warning could result in fire, explosion, or property
damage.
Table 11 lists the main burner orifices used with the furnace.
If a change of orifices is required to correct the furnace input
rating refer to Table 14.
TABLE 12
FINAL MANIFOLD PRESSURE SETTINGS (inches w.c.)
FUEL
2nd Stage Max.
1st Stage Max.
NATURAL GAS
3.5" W.C.
1.7" W.C.
LP GAS
10.5" W.C.
6.0" W.C.
%
Gas Valve On / Off
Toggle Switch
1st Stage (LO)
Manifold
Pressure
Adjustment
2nd Stage (HI)
Manifold
Pressure
Adjustment
White-Rodgers 36E
White-Rodgers 36G
^
2nd Stage (HI)
Manifold
Pressure
Adjustment
Gas Valve On / Off
Toggle Switch
1st Stage (LO)
Manifold
Pressure
Adjustment
ROTATE THE FRONT
COVER INWARD MAKING
SURE THAT ALL SIDE
FLANGES ARE OUTSIDE
OF THE BOX.
INSERT THE TOP FLANGE
OF THE FRONT COVER
UNDER THE LIP INSIDE
THE BOX
ALL SIDE FLANGES MUST
BE OUTSIDE OF THE BOX
ROTATE THE FRONT
COVER AS SHOWN
&