WARNING: Never purge a gas line into a combustion
chamber. Never use matches, candles, flame, or other
sources of ignition for the purpose of checking leakage.
Use a soap-and-water solution to check for leakage.
Failure to follow this warning could result in fire,
explosion, personal injury, or death.
V. ADJUSTMENTS
A. Set Gas Input Rate
There are 2 methods of adjusting gas input rate. The preferred
method is by using Table 11 and following instructions in item 1.
The second method is by clocking the gas meter as outlined in item
2. Item 2 must be used for altitudes above 2000 ft.
1. Determine natural gas orifice size and manifold pressure for
correct input by using Table 11.
a. Obtain average yearly heat value for local gas supply.
b. Obtain average yearly specific gravity for local gas
supply.
c. Verify the furnace model. Table 11 can only be used for
model 355MAV Furnaces.
d. Find natural gas heat value and specific gravity in Table
11.
e. Follow heat value line and specific gravity line to point
of intersection to find orifice size and manifold pressure
settings for proper operation at given natural gas condi-
tion.
TABLE 8—CONTINUOUS FAN (CF) AIRFLOW SETUP SWITCH POSITION
CONTINUOUS
FAN (CFM)
CF SETUP
SWITCH POSITION
ALLOWABLE FURNACE MODEL SETUP
CF-1 CF-2 CF-3 042040 042060 042080 →060080 060100 →060120
Default OFF OFF OFF 565* 515* 690* 690* 860* 1035*
600 ON OFF OFF X X X — — —
800 OFFONOFFXXXXXX
1000 ONONOFFXXXXXX
1200 OFFOFFONXXXXXX
1400 ONOFFONXXXXXX
1600 OFF ON ON — — — X X X
2000 ON ON ON — — — X X X
* Add 15% additional CFM when Bypass Humidifier switch SW-3 on control board is used. X—Indicates allowable selection.
Fig. 44—Inducer Housing Drain Tube
A94208
Fig. 45—Filling Condensate Trap
A94209
—34—
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