![background image](http://html.mh-extra.com/html/carrier/48hc-04-14/48hc-04-14_service-and-maintenance-instructions_2561012046.webp)
46
Table 19 – Altitude Compensation* (04--06) -- Low NOx Units
NATURAL GAS ONLY
NOMINAL HEAT INPUT
ELEVATION
60k BTUH
90k BTUH
120k BTUH
Feet
Meters
Orifice
Size
Input
(btu/hr)
Orifice
Size
Input
(btu/hr)
Orifice
Size
Input
(btu/hr)
0 --- 2000
0 --- 610
38
2
60,000
38
2
90,000
32
1
120,000
2000
610
39
2
55,200
39
2
82,800
33
1
110,400
3000
914
†40
52,800
†40
79,200
33
1
105,600
4000
1219
†41
50,400
†41
75,600
35
1
100,800
5000
1524
†41
48,000
†41
72,000
35
1
96,000
6000
1829
†42
45,600
†42
68,400
36
1
91,200
7000
2134
†42
43,200
†42
64,800
36
1
86,400
8000
2438
†43
40,800
†43
61,200
37
2
81,600
9000
2743
†43
38,400
†43
57,600
38
2
76,800
10000
3048
44
2
36,000
44
2
54,000
†40
72,000
11000
3353
44
2
33,600
44
2
50,400
†41
67,200
12000
3658
45
2
31,200
45
2
46,800
†42
62,400
13000
3962
47
3
28,800
47
3
43,200
†43
57,600
14000
4267
48
3
26,400
48
3
39,600
†43
52,800
* 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.
{
Not included in kit. May be purchased separately through dealer.
ORIFICE
XX
1
XX
2
XX
3
XX
4
ACC. KIT PN
CRLPELEV001A00
CRLPELEV002A00
CRLPELEV003A00
CRLPELEV004A00
Minimum heating entering air temperature
When operating on first stage heating, the minimum
temperature of air entering the dimpled heat exchanger is
50
_
F continuous and 45
_
F intermittent for standard heat
exchangers and 40
_
F continuous and 35
_
F intermittent for
stainless steel heat exchangers. To operate at lower
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. 59. Set the
outdoor--air thermostat at 35
_
F for stainless steel heat
exchangers or 45
_
F 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 may 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
Fig. 59 -- OATL Connections
Troubleshooting Heating System
Refer to Table 20 and Table 21 for additional
troubleshooting topics.
48H
C
Summary of Contents for 48HC*04-14
Page 94: ...94 APPENDIX IV WIRING DIAGRAMS C14007 Fig 80 48HC A04 A06 YAC Power Diagram 230 1 60 48HC ...
Page 96: ...96 APPENDIX IV WIRING DIAGRAMS C14013 Fig 82 48HC A04 A06 YAC Power Diagram 575 3 60 48HC ...
Page 97: ...97 APPENDIX IV WIRING DIAGRAMS C14018 48HC ...
Page 98: ...98 APPENDIX IV WIRING DIAGRAMS C14019 48HC ...
Page 99: ...99 APPENDIX IV WIRING DIAGRAMS C13484 Fig 83 48HC D08 D09 YAC Power Diagram 230 460 3 60 48HC ...
Page 100: ...100 APPENDIX IV WIRING DIAGRAMS C14024 Fig 84 48HC D08 D09 YAC Power Diagram 575 3 60 48HC ...
Page 101: ...101 APPENDIX IV WIRING DIAGRAMS C14027 Fig 85 48HC D12 YAC Power Diagram 230 460 3 60 48HC ...
Page 102: ...102 APPENDIX IV WIRING DIAGRAMS C14029 Fig 86 48HC D12 YAC Power Diagram 575 3 60 48HC ...
Page 104: ...104 APPENDIX IV WIRING DIAGRAMS C14032 Fig 88 48HC D14 YAC Power Diagram 230 460 3 60 48HC ...
Page 105: ...105 APPENDIX IV WIRING DIAGRAMS C12462 Fig 89 48HC D14 YAC Power Diagram 575 3 60 48HC ...
Page 123: ...123 APPENDIX IV WIRING DIAGRAMS C12690 Fig 107 PremierLink System Control Wiring Diagram 48HC ...
Page 125: ...125 APPENDIX IV WIRING DIAGRAMS C14034 Fig 109 RTU Open Wiring Diagram 48HC ...