Ито ш·¹¸ я´¬·¬«¼» ь – Klimaire GM80S Series User Manual
Page 19
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I&O manual
NOTE: Adjusting the minimum supply pressure below the limits
in the above table could lead to unreliable ignition. Gas input to
the burners must not exceed the rated input shown on the rating
plate. Overfiring of the furnace can result in premature heat
exchanger failure. Gas pressures in excess of 13 inches water
column can also cause permanent damage to the gas valve.
At all altitudes and with either fuel the air temperature rise must
be within the range listed on the furnace nameplate. Should this
appliance be converted to LP refer to the instructions included in
the factory authorized LP conversion kit.
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Alternately standard derate for altitude from National Fuel Gas
Code ANSI Z223.1 of 4% per 1000' may be taken. Refer to the
most recent version of ASNI Z223.1 for correct gas orifice. The
orifices must be selected using the table below. The furnace
derate is 4% for each 1,000 feet above sea level. This table is
based upon a heating value of approximately 1,000 Btu/ft3.
In Canada ,the input rating must be derated by 10 percent for
altitudes of 2,000 ft. (610m) to 4,500 feet (1370m) above sea level
by an authorized Gas Conversion Station or Dealer.
When an appliance is installed at elevations above 4500ft (1350m),
the certified high-altitude input rating shall be reduces at the rate of
4% for each additional 1000ft (300m).
In some areas the gas supplier may artificially derate the gas in an
effort to compensate for the effects of altitude. If the gas is artificially
derated, the appropriate orifice size must be determined based upon
the BTU/ft3 content of the derated gas and the altitude. Refer to the
latest version of NFPA54/ANSI Z223.1 for US and the latest version
of CSA B149.1 for Canada., and information provided by the gas
supplier to determine the proper orifice size.
The input to the furnace must be checked AFTER reorificing.
*LP orifice based on 10 inWC manifold pressure
Table 9 High Altitude Derate Orifice Size Chart (Natural and LP Gas*)
The input to the furnace must be checked AFTER reorificing.
*LP orifice based on 10 inWC manifold pressure
Table 10 High Altitude Derate Orifice Size Chart (Natural and LP Gas*)
Canada Installation
US Installation
Input Rate
Number of
KBTU/H
Burner
Nat
LP
Nat
LP
Nat
LP
Nat
LP
Nat
LP
50
3
49
57
50
58
51
59
52
61
53
62
80
5
49
57
50
58
51
59
52
61
53
62
70
3
48
56
49
57
50
58
51
60
52
61
90
5
48
56
49
57
50
58
51
60
52
61
110
6
48
56
49
57
50
58
51
60
52
61
100
6
49
57
50
58
51
59
52
61
53
62
120
7
49
57
50
58
51
59
52
61
53
62
135
8
49
57
50
58
51
59
52
61
53
62
Elevation (Ft)
0-2000
Elevation (Ft)
8000-10000
Elevation (Ft)
2000-4000
Elevation (Ft)
4000-6000
Elevation (Ft)
6000-8000
Input Rate
Number of
KBTU/H
Burner
Nat
LP
Nat
LP
Nat
LP
Nat
LP
Nat
LP
50
3
49
57
50
58
51
59
52
61
53
62
80
5
49
57
50
58
51
59
52
61
53
62
70
3
48
56
49
57
50
58
51
60
52
61
90
5
48
56
49
57
50
58
51
60
52
61
110
6
48
56
49
57
50
58
51
60
52
61
100
6
49
57
50
58
51
59
52
61
53
62
120
7
49
57
50
58
51
59
52
61
53
62
135
8
49
57
50
58
51
59
52
61
53
62
Elevation (Ft)
0-2000
Elevation (Ft)
8000-10000
Elevation (Ft)
2000-4500
Elevation (Ft)
4500-6000
Elevation (Ft)
6000-8000