18-CD31D1-5
19
Installer’s Guide
6. Multiply the final figure by the heating value of the gas
obtained from the utility company and compare to the
nameplate rating. This must not exceed the nameplate
rating.
Gas Valve Adjustment
Changes can be made by adjusting the manifold pressure
(See Table 9), or changing orifices (orifice change may
not always be required). To adjust the manifold pres-
sure:
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. See Figure 27 for 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) con-
tains a 3/32" hex wrence, a 5/16" hose and a connec-
tor and can be ordered through Global Parts.
4. Turn on system power and energize valve.
5. Adjust 1st stage gas heat by removing the low (LO)
adjustment regulator cover screw.
a. To increase outlet pressure, turn the regulator ad-
just screw clockwise.
b. To decrease outlet pressure, turn the regulator ad-
just screw counterclockwise.
c. Adjust regulator until pressure shown on mano-
meter matches the pressure specified in Table 9.
1. 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 se-
curely.
6. Adjust 2nd stage gas heat by removing the high (HI)
adjustment regulator cover screw.
a. To increase outlet pressure, turn the regulator ad-
just screw clockwise.
b. To decrease outlet pressure, turn the regulator ad-
just screw counterclockwise.
c. Adjust regulator until pressure shown on mano-
meter matches the pressure specified in Table 9.
1. 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 se-
curely.
7. Cycle the valve several times to verify regulator set-
ting.
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.
▲
WARNING
!
Explosion Hazard
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.
For LP gases, the final manifold pressure setting shall be
10.5" W.C. with an input of no more than the nameplate
rating and no less than 93% of the nameplate rating, unless
the unit is derated for altitude.
Table 11 lists the main burner orifices shipped with the fur-
nace. If a change of orifices is required to correct the input
rate, refer to Table 12.
j
2nd Stage (HI) Manifold
Pressure Adjustment
Gas Valve On / Off
Toggle Switch
1st Stage (LO)
Manifold Pressure
Adjustment
White-Rodgers 36J
Outlet
Pressure
Boss
Inlet Pressure
Boss
