16
46201200402
Specifications are subject to change without notice.
S
The rated gas inputs shown in Table 6 are for altitudes from sea
level to 2000 ft (610 m) above sea level. These inputs are based
on natural gas with a heating value of 1025 Btu/ft
3
at 0.60
specific gravity, or propane gas with a heating value of 2500
Btu/ft
3
at 1.5 specific gravity.
IN THE U.S.A.:
The input rating for altitudes above 2,000 ft (610 m) must be
reduced by 4% for each 1,000 ft (305 m) above see 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 Table 3 for correct input rate.
Table 3 – Altitude Derate Multiplier for U.S.A.*
ALTITUDE FT (M)
PERCENT OF DERATE
DERATE MULTIPLIER
FACTOR
{
0---2000
(0---610)
0
1.00
2001---3000*
(610---914)
8--- 12
0.90
3001---4000
(915---1219)
12--- 16
0.86
4001---5000
(1220---1524)
16--- 20
0.82
5001---6000
(1524 ---1829)
20--- 24
0.78
6001---7000
(1829---2134)
24--- 28
0.74
7001---8000
(2134---2438)
28--- 32
0.70
8001---9000
(2439---2743)
32--- 36
0.66
9001---10,000
(2744---3048)
36--- 40
0.62
*In Canada see Canadian Altitude Adjustment.
{
Derate multiplier factors are based on midpoint altitude for altitude range.
IN CANADA:
The input rating for altitudes from 2,000 (610 m) to 4,500 ft (1372
m) above sea level must be derated 10% by an authorized Gas
Conversion Station or Dealer.
EXAMPLE:
90,000 Btu/hr Input Furnace Installed at 4300 ft.
Furnace Input Rate at
Sea Level
X Derate Multiplier
Factor
= Furnace Input Rate at
Installation Altitude
90,000
X
0.90
=
81,000
When the gas supply being used has a different heating value or
specific gravity, refer to national and local codes, or contact your
distributor to determine the required orifice size.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit
and/or component life.
Do Not
redrill an orifice. Improper drilling (burrs,
out--of--round holes, etc.) can cause excessive burner noise
and misdirection of burner flame. If orifice hole appears
damaged or it is suspected to have been redrilled, check
orifice hole with a numbered drill bit of correct size.
!
CAUTION
Table 4 – High Altitude Compensation, Natural Gas -- Single Phase Models
Nameplate
Input (Btu/hr)
Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.*
0 to 2000 ft
(0---610 m)
2001 to 3000 ft*
(611 to 914 m)
3001 to 4000 ft
(915 to 1219 m)
4001 to 5000 ft
(1220 to 1524 m)
5001 to 6000 ft
(1524 to 1829 m)
40000
40000
36000
34400
32800
31200
60000
60000
54000
51600
49200
46800
90000
90000
81000
77400
73800
70200
115000
115000
103500
98900
94300
89700
127000
127000
114300
109200
104100
99100
*In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or
dealer.
For Canadian Installations from 2000 to 4500 ft (610---1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
Table 5 – High Altitude Compensation, Natural Gas -- Three Phase
Nameplate
Input (Btu/hr)
Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.*
0 to 2000 ft
(0---610 m)
2001 to 3000 ft*
(611 to 914 m)
3001 to 4000 ft
(915 to 1219 m)
4001 to 5000 ft
(1220 to 1524 m)
5001 to 6000 ft
(1524 to 1829 m)
40000
40000
36000
34400
32800
31200
60000
60000
54000
51600
49200
46800
90000
90000
81000
77400
73800
70200
115000
115000
103500
98900
94300
89700
130000
130000
117000
111800
106600
101400
*In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or
dealer.
For Canadian Installations from 2000 to 4500 ft (610---1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
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