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Installer's Guide
T
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 13
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 14
ORIFICE SIZES
INPUT
NUMBER
RATING
OF
BTUH
BURNERS
40,000
2
60,000
3
80,000
4
100,000
5
120,000
6
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 16 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 =
For 1/2 Cu Ft. Dial Gas Flow CFH =
For 5 Cu. Ft. Dial Gas Flow CFH =
32
DRIP
LEG
LENGTH OF PIPE
40
50
60
63
56
50
130
115
105
245
215
195
520
440
400
MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS
LP GAS
45
56
45
56
45
56
45
56
45
56
Chart Flow Reading ÷2
Chart Flow Reading ÷4
10X Chart Flow Reading ÷4
MAIN MANUAL
SHUTOFF VALVE
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
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.
7. Changes can be made by adjusting the manifold
70
pressure or changing orifices (orifice change may
46
not always be required). To adjust the manifold
96
pressure:
180
a. Turn off all electrical power to the system.
370
b.Attach a manifold pressure gauge to the outlet
pressure tap marked "OUT PRESS TAP" on
White-Rodgers gas valve model 36F or boss
marked "OUT P" on White-Rodgers gas valve
model 36G. (See Figure 58 for White-Rodgers gas
valve model 36F and Figure 59 for White-Rodgers
gas valve model 36G). For the gas valve model
36F, measurement requires removal of the plug
and installation of a barbed fitting. Attach flexible
tubing and a manometer to the barbed fitting.
For the gas valve model 36G, do not remove the
pressure tap test screw. Using a 3/32" hex
wrench, loosen the pressure tap test screw one
turn and install 5/16" flexible tubing and a ma-
nometer directly onto the outlet pressure boss.
c. Turn on system power and energize valve.
d.Remove the regulator adjustment screw cap on
the gas valve for manifold pressure adjustment.
e.Turn the adjustment nut clockwise to increase
the gas flow rate, and counterclockwise to de-
crease the gas flow rate using a 3/32" hex wench.
f. The final manifold pressure setting shall be as
specified in Table 15 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.
g. Replace the regulator adjustment screw cap and
tighten securely.
GROUND UNION JOINT
DRIP
LEG
18-CD19D6-32
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