Carrier 48HC D17 Series Service And Maintenance Instructions page 50

NATURAL GAS
ELEVATION
Feet
0 --- 2000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
PROPANE GAS
ELEVATION
Feet
0 --- 2000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
* 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.:
1
XX = CRNGELEV001A00
2
XX = CRNGELEV002A00
3
XX = CRLPELEV005A00
4
XX = CRLPELEV006A00
5
XX = 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
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
Table 14 - - Altitude Compensation* (17 - - 30) - - Natural Gas
220k BTUH
Orifice Input
Meters
Size (btu/hr)
0 --- 610 30 220,000
610 30 202,400
1
914 31 193,600
1
1219 31 184,800
1
1524 31 176,000
1
1829 31 167,200
1
2134 32 158,400
1
2438 32 149,600
1
2743 34 140,800
2
3048 35 132,000
2
3353 37 123,200
2
3658 37 114,400
2
3962 39 105,600
2
4267 39 96,800
Table 15 – Altitude Compensation* (17 - - 30) - - Propane Gas
220k BTUH
Orifice Input
Meters
Size (btu/hr)
5
0 --- 610 48 220,000
3
610 49 202,400
3
914 49 193,600
3
1219 49 184,800
3
1524 50 176,000
3
1829 50 167,200
3
2134 50 158,400
3
2438 51 149,600
3
2743 51 140,800
4
3048 52 132,000
4
3353 52 123,200
4
3658 53 114,400
4
3962 53 105,600
4
4267 53 96,800
for stainless steel heat
NOMINAL HEAT INPUT
310k BTUH 400k BTUH
Orifice Input Orifice
Size (btu/hr) Size
30 310,000 30
30 285,200 30
1 1
31 272,800 31
1 1
31 260,400 31
1 1
31 248,000 31
1 1
31 235,600 31
1 1
32 223,200 32
1 1
32 210,800 32
1 1
34 198,400 34
2 2
35 186,000 35
2 2
37 173,600 37
2 2
37 161,200 37
2 2
39 148,800 39
2 2
39 136,400 39
NOMINAL HEAT INPUT
310k BTUH 400k BTUH
Orifice Input Orifice
Size (btu/hr) Size
5 5
48 310,000 48
3 3
49 285,200 49
3 3
49 272,800 49
3 3
49 260,400 49
3 3
50 248,000 50
3 3
50 235,600 50
3 3
50 223,200 50
3 3
51 210,800 51
3 3
51 198,400 51
4 4
52 186,000 52
4 4
52 173,600 52
4 4
53 161,200 53
4 4
53 148,800 53
4 4
53 136,400 53
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.
Thermostat
TH1
W1
TH2
W2
50
Input
(btu/hr)
400,000
368,000
352,000
336,000
320,000
304,000
288,000
272,000
256,000
240,000
224,000
208,000
192,000
176,000
Input
(btu/hr)
400,000
368,000
352,000
336,000
320,000
304,000
288,000
272,000
256,000
240,000
224,000
208,000
192,000
176,000
LCTB
W1
OALT
W2
C08442