Bryant 312AAV - Manual (Page 25)

NOTE: DO NOT set high-heat manifold pressure less than
3.2–in. wc or more than 3.8–in. wc for natural gas. If manifold
pressure is outside this range, change main burner orifices.
h. When correct input is obtained, replace caps that conceal
gas valve regulator adjustment screws. Main burner
flame should be clear blue, almost transparent. (See Fig.
34.)
i. Remove jumper R-to-W2.
6. Verify natural gas input rate by clocking gas meter.
a. Calculate high-altitude adjustment (if required).
UNITED STATES
At altitudes above 2000 ft, this furnace has been ap-
proved for a 4 percent derate for each 1000 ft above sea
level. See example and Table 10 for derate multiplier
factor.
CANADA
At installation altitudes from 2000 to 4500 ft, this
furnace must be derated 10 percent by an authorized Gas
Conversion Station or Dealer. To determine correct input
rate for altitude, see example above and use 0.90 as
derate multiplier factor.
b. Check that gas valve adjustment caps are in place for
proper input to be clocked.
c. Obtain yearly heat value average for local gas supply.
NOTE: Be sure heating value of gas used for calculation is
correct for your altitude. Consult local gas utility for altitude
adjustment of gas heating value.
A00279
Fig. 28–Dual Fuel Thermostat with Two-Stage Furnace and
Single-Speed Heat Pump
Fig. 30–Two-Stage Thermostat with Two-Stage Furnace and
Two-Speed Air Conditioner
A00281
A00280
Fig. 29– Dual Fuel Thermostat with Two-Stage Furnace and
Two-Speed Heat Pump
A00282
Fig. 31–Single-Stage Thermostat with Two-Stage Furnace
and Two-Speed Air Conditioner
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