18-CD33D1-4
31
Installer’s Guide
▲
CAUTION
!
Use a backup wrench on the gas valve when install-
ing gas piping to prevent damage to the gas valve and
manifold assembly.
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 pres-
sure (See Table 12), or changing orifices (orifice
change may not always be required). To adjust the
manifold pressure:
1. Turn off all electrical power to the system.
2. Attach a manifold pressure gauge with flexible tub-
ing to the outlet pressure boss marked “OUT P” on
White-Rodgers gas valve model 36G or 36J. See
Figure 54 for White-Rodgers gas valve model 36J.
See Figure 53 for White-Rodgers gas valve model
36G.
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 con-
nector and can be ordered through Global Parts.
4. Turn on system power and energize valve.
5. Adjust gas heat by removing the adjustment regula-
tor 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 mano-
meter matches the pressure specified in Table 12.
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
securely.
6. Cycle the valve several times to verify regulator set-
ting.
a. Repeat steps 5-6 if needed.
7. Turn off all electrical power to the system.
8. Remove the manometer and flexible tubing and
tighten the pressure tap screw.
9. Using a leak detection solution or soap suds, check
for leaks at the pressure outlet boss and pressure tap
test screw.
10. Turn on system power and check operation of the
unit.
ORIFICE SIZES
MODEL
INPUT
RATING
BTUH
NUMBER
OF
BURNERS
MAIN BURNER
ORIFICE
DRILL SIZE
NAT.
GAS
LP GAS
*UH1B040A9H21B
40,000
2
45
56
*UH1B060A9H31B
60,000
3
45
56
*UH1B080A9H31C
77,000
4
45
56
*UH1C100A9H41B 100,000
5
45
56
*UH1D120A9H51B 110,000
6
45
56
*DH1B040A9H21B
40,000
2
45
56
*DH1B065A9H31B
60,000
4
48
56
*DH1C085A9H41B
80,000
5
48
56
*DH1D110A9H51B 110,000
6
48
56
FINAL MANIFOLD PRESSURE SETTINGS
MODEL
FUEL
PRESSURE
NATURAL GAS
LP GAS
*UH1B040A9H21B
3.5" W.C.
11.0" W.C.
*UH1B060A9H31B
3.5" W.C.
11.0" W.C.
*UH1B080A9H31C
3.5" W.C.
11.0" W.C.
*UH1C100A9H41B
3.5" W.C.
11.0" W.C.
*UH1D120A9H51B
3.3" W.C.
11.0" W.C.
*DH1B040A9H21B
3.5" W.C.
11.0" W.C.
*DH1B065A9H31B
3.0" W.C.
9.5" W.C.
*DH1C085A9H41B
3.5" W.C.
11.0" W.C.
*DH1D110A9H51B
4.5" W.C.
11.0" W.C.
COMBUSTION AND INPUT CHECK
1. Make sure all gas appliances are off except the fur-
nace.
2. Clock the gas meter with the furnace operating (de-
termine the dial rating of the meter) for one revolu-
tion.
3. Match the “Sec” column in the gas flow (in cfh) Table
13 with the time clocked.
4. Read the “Flow” column opposite the number of sec-
onds clocked.
5. Use the following factors if necessary:
For 1 Cu. Ft. Dial Gas Flow CFH =
Chart Flow Reading ÷2
For 1/2 Cu Ft. Dial Gas Flow CFH =
Chart Flow Reading ÷4
For 5 Cu. Ft. Dial Gas Flow CFH =
10X Chart Flow Reading ÷4
TABLE 11
TABLE 10
