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American Standard AUD2B060AFV32A Installer's Manual Page 21

Variable speed, 2-stage, 80% upflow/horizontal gas-fired furnaces, fan assisted combustion system with whole house air cleaner.
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(See also High Altitude Derate)
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-
2. Clock the gas meter with the Furnace operating
(determine the dial rating of the meter) for one
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 =
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:
a. Turn off all electrical power to the system.
Figure 16
10X Chart Flow Reading ÷4
Return all tubing, caps, and/or plugs to original positions when pressure checks are completed.
Installer's Guide
b. Attach a Manifold Pressure gauge to the outlet
pressure tap marked "OUT PRESS TAP" on
White-Rodgers gas valve model 36G. (see Figure
17 for White-Rodgers gas valve model 36G). At-
tach 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 directly 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 16.
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 17).
2. To increase outlet pressure, turn the regulator
adjust screw clockwise.
pressure, turn the regulator adjust screw
counterclockwise. Adjust regulator until pres-
sure shown on Manometer matches the pres-
sure specified in Table 9.
3. Replace and tighten the regulator cover screw
4. Cycle the Valve several times to verify regula-
tor setting.
5. Adjust high fire by removing the high adjust-
ment regulator cover screw (See Figure 17).
To decrease outlet


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