High Altitude Derate - Trane UD1A040A9241A Series Installer's Manual

TABLE 12
ORIFICE SIZES
INPUT NUMBER
RATING OF
BTUH BURNERS
40,000 2
60,000 3
80,000 4
100,000 5
120,000 6
140,000 7
TABLE 13
PART NUMBERS FOR REPLACEMENT ORIFICES
DRILL PART
SIZE NUMBER
44 ORF00501
45 ORF00644
46 ORF00909
47 ORF00910
48 ORF01099
49 ORF00503
50 ORF00493

HIGH ALTITUDE DERATE

Input ratings (BTUH) of these furnaces are based on sea
level operation and should not be changed at elevations up to
2,000 ft.
If the installation is 2,000 ft. or above, the furnace input rate
(BTUH) shall be reduced 4% for each 1,000 ft. above sea
level. The furnace input rate shall be checked by clocking
the gas flow rate (CFH) and multiplying by the heating value
obtained from the local utility supplier for the gas being
delivered at the installed altitude. Input rate changes can be
made by adjusting the manifold pressure (min 3.0 - max
3.7 in. W.C. - Natural Gas) or changing orifices (orifice
change may not always be required). If the desired input rate
cannot be achieved with a change in manifold pressure, then
the orifices must be changed. LP installations will require an
orifice change.
IMPORTANT: Reinstall the propane orifices to the same depth
as the orifices supplied with the equipment.
See Table 15 (page 20) for help in selecting orifices if orifice
change is required. Furnace input rate and temperature rise
should be checked again after changing orifices to confirm
the proper rate for the altitude.
Installations above 4,000 feet may require a pressure switch
change. If required, use the BAYHALT*** Kit (High Altitude
Accessory Kit) listed in PRODUCT DATA.
Installation of this furnace at altitudes above 2,000 ft.
(610m) shall be in accordance with the local codes, or in the
absence of local codes, the National Fuel Gas Code, ANSI
Z223.1/ NFPA 54 or National Standard of Canada, Natural
Gas and Propane Installation Code, CSA 149.1. Installation of
this furnace at altitudes above 2,000 ft. (610m) shall be made
in accordance with the listed high Altitude Conversion Kit
available with this furnace.
18-CD19D7-22
MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS LP GAS
45 56
45 56
45 56
45 56
45 56
45 56
DRILL PART
SIZE NUMBER
54 ORF00555
55 ORF00693
56 ORF00907
57 ORF00908
58 ORF01338
59 ORF01339
Installer's Guide
TABLE 14
GAS FLOW IN CUBIC FEET PER HOUR
2 CUBIC FOOT DIAL
SEC. FLOW SEC. FLOW SEC. FLOW SEC. FLOW
8 900 29 248
9 800 30 240
10 720 31 232
11 655 32 225
12 600 33 218
13 555 34 212
14 514 35 206
15 480 36 200
16 450 37 195
17 424 38 189
18 400 39 185
19 379 40 180
20 360 41 176
21 343 42 172
22 327 43 167
23 313 44 164
24 300 45 160
25 288 46 157
26 277 47 153
27 267 48 150
28 257 49 147
Outlet Pressure Boss Outlet Pressure Boss
j
Inlet Pressure let Pressure
Boss (opt.) .) Boss
On/Off ff Swi
White-Rodgers 36G gas valve
k
Outlet Pressure Boss
Inlet Pressure
Boss (opt.)
On/Off Switch
White-Rodgers 36J gas valve
50 144 82 88
51 141 84 86
52 138 86 84
53 136 88 82
54 133 90 80
55 131 92 78
56 129 94 76
57 126 96 75
58 124 98 73
59 122 100 72
60 120 104 69
62 116 108 67
64 112 112 64
66 109 116 62
68 106 120 60
70 103 124 58
72 100 128 56
74 97 132 54
76 95 136 53
78 92 140 51
80 90 144 50
Regul ulator tor
Adjust Adj ust
Switch ch
Regulator
Adjustment
19