Trane UHMB060ACV3VB Installer's Manual page 37

If the desired input rate cannot be achieved with a
change in manifold pressure, then the orifices must be
changed. See Table 16 for replacement orifice part num-
bers.
LP installations will require an orifice and gas valve
change. Order kit BAYLPKT220B or BAYLPSS220B.
IMPORTANT:
Reinstall the propane orifices to the same depth as the ori-
fices supplied with the equipment.
See Table 17 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. The vent length
table on page 19 shows the required vent lengths
for installations at various altitudes. An optional high
altitude kit is available for installations above 4000 feet
(Installations above 12,000 feet are not allowed). Use
Table 15A to select the appropriate high altitude kit for
your furnace model.
TABLE 16
PART NUMBERS FOR REPLACEMENT ORIFICES
DRILL PART
SIZE NUMBER
44 ORF00501
45 ORF01427
46 ORF00909
47 ORF01429
48 ORF01099
49 ORF00503
50 ORF00493
51 ORF00494
TABLE 17
Orifice
Twist ALTITUDE ABOVE SEA LEVEL
Drill
Size If and Orifice Required At Other Elevations
In-
stalled
At Sea
2000 3000 4000 5000 6000 7000 8000 9000 10000
Level
42 42 43 43 43
43 44 44 44 45
44 45 45 45 46
45 46 47 47 47
46 47 47 47 48
47 48 48 49 49
48 49 49 49 50
49 50 50 50 51
50 51 51 51 51
51 51 52 52 52
52 52 53 53 53
53 54 54 54 54
54 54 55 55 55
55 55 55 55 56
56 56 56 57 57
57 58 59 59 60
58 59 60 60 61
From National Fuel Gas Code - Table F-4
DRILL PART
SIZE NUMBER
52 ORF00495
53 ORF00504
54 ORF00555
55 ORF00693
56 ORF01428
57 ORF00908
58 ORF01338
59 ORF01339
44 44 45 46 47
45 46 47 47 48
47 47 48 48 50
48 48 49 49 50
48 49 49 50 51
49 50 50 51 52
50 50 51 51 52
51 51 52 52 52
52 52 52 53 53
52 53 53 53 54
53 53 54 54 54
54 54 55 55 55
55 55 56 56 56
56 56 56 56 57
57 58 59 59 60
60 61 62 63 63
62 62 63 63 64
18-CD30D1-12
Installer's Guide
TABLE 18
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
Note:
Natural gas input rate should be clocked at gas meter in high
heat when the gas valve is replaced or gas valve pressure
adjustments are made.
Table 19 lists the main burner orifices used with the Furnace.
Table 19 ORIFICE SIZES
INPUT NUMBER
RATING OF
BTUH BURNERS
60,000 3
80,000 4
100,000 5
120,000 6
Note:
The LP Conversion Kit used with the modulating furnace
is BAYLPSS220B or BAYLPKT220B.
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
MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS LP GAS
45 56
45 56
45 56
45 56
37