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COMBUSTION AND INPUT CHECK
(See also High Altitude Derate)
▲
WARNING
!
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, ex-
plosion, property damage, or death.
1. Make sure all gas appliances are off except the Fur-
nace.
2. Clock the gas meter with the Furnace operating
(determine the dial rating of the meter) for one
revolution.
3. Match the "Sec" column in the gas flow (in cfh)
Table 8 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
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
Pressure (See Table 9), or changing orifices (orifice
change may not always be required). To adjust the
Manifold Pressure:
Figure 32
▲
CAUTION:
18-CD25D1-2
Return all tubing, caps, and/or plugs to original positions when pressure checks are completed.
Installer's Guide
a. Turn off all electrical power to the system.
b. Attach a Manifold Pressure gauge to the outlet
pressure tap marked "OUT PRESS TAP" on
White-Rodgers gas valve model 36G. (see Fig-
ure 33 for White-Rodgers gas valve model 36G).
Attach flexible tubing and a Manometer to the
barbed fitting. For the Gas Valve model 36G, do
not remove the pressure tap test screw.
Loosen the pressure tap test screw one turn
and install flexible tubing and a Manometer di-
rectly onto the outlet pressure boss.
c.
The other side of the Manifold Pressure Gauge
must be referenced to the Burner Box as shown
in Figure 32.
d. Turn on system power and energize Valve.
e. For the White-Rodgers Gas Valve model 36G:
1. Adjust low fire by removing the low adjust-
ment regulator cover screw (See Figure
33).
2. To increase outlet pressure, turn the regu-
lator adjust screw clockwise. To decrease
outlet pressure, turn the regulator adjust
screw counter-clockwise. Adjust regulator
until
pressure
matches the pressure specified in Table 9.
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 ad-
justment regulator cover screw (See Figure
33).
shown
on
Manometer
33
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