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Installer's Guide
R
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
MAIN MANUAL
SHUTOFF VALVE
GROUND
UNION JOINT
HORIZONTAL FURNACE GAS PIPING MAY BE FROM EITHER SIDE (UPFLOW SHOWN)
TABLE 15
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GAS
FOR VARIOUS PIPE SIZES AND LENGTHS
PIPE
SIZE
10
20
30
1/2
132
92
73
3/4
278
190
152
1
520
350
285
1-1/4
1050
730
590
This table is based on pressure drop of 0.3 inch W.C. and 0.6 SP.GR. gas
TABLE 16
ORIFICE SIZES
INPUT
MODEL
RATING
BTUH
*UH1B040A9241A
40,000
*UH1B060A9361A
60,000
*UH1B080A9421A
80,000
*UH1C080A9601A
*UH1C100A9481A
100,000
*UH1D100A9601A
*UH1D120A9601A
110,000
*DH1B040A9241A
40,000
*DH1B065A9421A
60,000
*DH1C085A9481A
80,000
*DH1D110A9601A
110,000
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 18 with the time clocked.
4. Read the "Flow" column opposite the number of sec-
onds clocked.
32
DRIP
LEG
LENGTH OF PIPE
40
50
60
63
56
50
130
115
105
245
215
195
520
440
400
MAIN BURNER ORIFICE
NUMBER
DRILL SIZE
OF
BURNERS
NAT. GAS
LP GAS
2
45
3
45
4
45
5
45
6
45
2
45
4
48
5
48
6
48
MAIN MANUAL
SHUTOFF VALVE
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
5. Use the following factors if necessary:
For 1 Cu. Ft. Dial Gas Flow CFH =
For 1/2 Cu Ft. Dial Gas Flow CFH =
For 5 Cu. Ft. Dial Gas Flow CFH =
70
46
6. Multiply the final figure by the heating value of the
96
gas obtained from the utility company and compare
180
to the nameplate rating. This must not exceed the
370
nameplate rating.
Gas Valve Adjustment
Changes can be made by adjusting the manifold pres-
sure (See Table 17, or changing orifices (orifice
change may not always be required). To adjust the
manifold pressure:
1. Turn off all electrical power to the system.
56
56
2. Attach a manifold pressure gauge with flexible
56
tubing to the outlet pressure boss marked "OUT P"
on White-Rodgers gas valve model 36G or 36J. See
56
Figure 58 for White-Rodgers gas valve model 36J.
56
56
See Figure 57 for White-Rodgers gas valve model
56
36G.
56
56
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 energize valve.
GROUND UNION JOINT
DRIP
LEG
Chart Flow Reading ÷2
Chart Flow Reading ÷4
10X Chart Flow Reading ÷4
18-CD29D1-3
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