50
Table 14 -- Altitude Compensation* (17 -- 30) -- Natural Gas
NATURAL GAS
NOMINAL HEAT INPUT
ELEVATION
220k BTUH
310k BTUH
400k BTUH
Feet
Meters
Orifice
Size
Input
(btu/hr)
Orifice
Size
Input
(btu/hr)
Orifice
Size
Input
(btu/hr)
0 --- 2000
0 --- 610
30
220,000
30
310,000
30
400,000
2000
610
30
202,400
30
285,200
30
368,000
3000
914
31
1
193,600
31
1
272,800
31
1
352,000
4000
1219
31
1
184,800
31
1
260,400
31
1
336,000
5000
1524
31
1
176,000
31
1
248,000
31
1
320,000
6000
1829
31
1
167,200
31
1
235,600
31
1
304,000
7000
2134
32
1
158,400
32
1
223,200
32
1
288,000
8000
2438
32
1
149,600
32
1
210,800
32
1
272,000
9000
2743
34
1
140,800
34
1
198,400
34
1
256,000
10000
3048
35
2
132,000
35
2
186,000
35
2
240,000
11000
3353
37
2
123,200
37
2
173,600
37
2
224,000
12000
3658
37
2
114,400
37
2
161,200
37
2
208,000
13000
3962
39
2
105,600
39
2
148,800
39
2
192,000
14000
4267
39
2
96,800
39
2
136,400
39
2
176,000
Table 15 – Altitude Compensation* (17 -- 30) -- Propane Gas
PROPANE GAS
NOMINAL HEAT INPUT
ELEVATION
220k BTUH
310k BTUH
400k BTUH
Feet
Meters
Orifice
Size
Input
(btu/hr)
Orifice
Size
Input
(btu/hr)
Orifice
Size
Input
(btu/hr)
0 --- 2000
0 --- 610
48
5
220,000
48
5
310,000
48
5
400,000
2000
610
49
3
202,400
49
3
285,200
49
3
368,000
3000
914
49
3
193,600
49
3
272,800
49
3
352,000
4000
1219
49
3
184,800
49
3
260,400
49
3
336,000
5000
1524
50
3
176,000
50
3
248,000
50
3
320,000
6000
1829
50
3
167,200
50
3
235,600
50
3
304,000
7000
2134
50
3
158,400
50
3
223,200
50
3
288,000
8000
2438
51
3
149,600
51
3
210,800
51
3
272,000
9000
2743
51
3
140,800
51
3
198,400
51
3
256,000
10000
3048
52
4
132,000
52
4
186,000
52
4
240,000
11000
3353
52
4
123,200
52
4
173,600
52
4
224,000
12000
3658
53
4
114,400
53
4
161,200
53
4
208,000
13000
3962
53
4
105,600
53
4
148,800
53
4
192,000
14000
4267
53
4
96,800
53
4
136,400
53
4
176,000
* As the height above sea level increases, there is less oxygen per cubic ft. of air. Therefore, heat input rate should be reduced at higher altitudes.
KIT NO.:
XX
1
= CRNGELEV001A00
XX
2
= CRNGELEV002A00
XX
3
= CRLPELEV005A00
XX
4
= CRLPELEV006A00
XX
5
= CRLPKIT9001A00
Minimum Heating Entering Air Temperature
When operating on first stage heating, the minimum
temperature of air entering the dimpled heat exchanger is
50
_
F (10
_
C) continuous and 45
_
F (7
_
C) intermittent for
standard heat exchangers and 40
_
F (4
_
C) continuous and
35
_
F (2
_
C) intermittent for stainless steel heat
exchangers. To operate at lower return or mixed air
temperatures, a field--supplied outdoor--air thermostat
must be used to initiate both stages of heat when the
temperature is below the minimum required temperature
to ensure full fire operation. Wire the outdoor--air
thermostat (OALT) (part no. HH22AG106) in series with
the second stage gas valve. See Fig. 62. Set the
outdoor--air thermostat at 35
_
F (2
_
C) for stainless steel
heat exchangers or 45
_
F (7
_
C) for standard heat
exchangers. This temperature setting will bring on the
second stage of heat whenever the ambient temperature is
below the thermostat setpoint. Indoor comfort can be
compromised when heating is initiated using low entering
air temperatures with insufficient heating temperature rise.
LCTB
W2
Thermostat
TH1
TH2
W1
W1
W2
OALT
C08442
48H
C
Summary of Contents for 48HC D17 Series
Page 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Page 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Page 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Page 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Page 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...