Specifications are subject to change without notice.
441 01 3700 00
35
A190272
Fig. 46 -- Furnace Setup Switch Description
1. Default A/C when A/C
switches are in OFF
position.
2. Default Low stage A/C
airflow when CF switches
are in OFF position.
A190273
Fig. 47 -- Airflow Selection (based on 350 CFM/TON) for A/C (SW2--6, 7, 8) and *CF (SW2--3, 4, 5)
Adjustments
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
DO NOT bottom out gas valve regulator adjusting screw.
This can result in unregulated manifold pressure and result
in excess overfire and heat exchanger failures.
!
WARNING
Furnace gas input rate on rating plate is for installations at
altitudes up to 2000 Ft. (610 M). Furnace input rate must be
/--2 percent of furnace rating plate input.
1. Determine the correct gas input rate.
The input rating for altitudes above 2,000 ft. (610 M) must
be reduced by 4 percent for each 1,000 ft. (305 M) above
sea level.
For installations below 2000 Ft. (610 M), refer to the unit
rating plate. For installations above 2000 Ft. (610 M),
multiply the input on the rating plate by the de--rate multi-
plier in Table 9 for the correct input rate.
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
DO NOT redrill orifices. Improper drilling (burrs,
out--of--round holes, etc.) can cause excessive burner noise
and misdirection of burner flames. This can result in flame
impingement of heat exchangers, causing failures. (See Fig.
43.)
CAUTION
!
2. Determine the correct orifice and manifold pressure adjust-
ment. All models in all positions use Table 11 (22,000
Btuh per burner.) See input listed on rating plate.
