830CA: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Furnace gas input rate on rating plate is for installations at altitudes up to
2,000 ft. (610 M). Furnace input rate must be within +/-2 percent of
furnace rating plate input.
1. Determine the correct gas input rate. Refer to the unit rating plate.
The input rating for altitudes above 2,000 ft. (610 M) must be
reduced by 2 percent for each 1,000 ft. (305 M) above sea level. For
installations below 2,000 ft. (610 M), refer to the unit rating plate.
For installations above 2,000 ft. (610 M), multiply the input on the
rating plate by the derate multiplier in
rate.
Table 9 – Altitude Derate Multiplier for U.S.A.
Table 10 – Furnace Setup Switch Description
A190351
A190348
Fig. 39 – Service Label
ALTITUDE
(FT. / M)
PERCENT OF
DERATE
DERATE
MULTIPLIER FACTOR
*
0–2000 (0-610)
0
1.00
2001–3000 (610-914)
4-6
0.95
3001–4000 (914-1219)
6-8
0.93
4001–5000 (1219-1524)
8-10
0.91
5001–5400 (1525-1646)
10-11
0.90
*. Derate multiplier factors are based on midpoint altitude for altitude range.
