American Standard UHMB080ACV3VB Series 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
Orifice
Twist ALTITUDE ABOVE SEA LEVEL
Drill
Size If
and Orifice Required At Other Elevations
In-
stalled
At Sea
2000 3000 4000 5000
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
TABLE 17
6000 7000 8000 9000
44 44 45 46
45 46 47 47
47
47 48 48
48 48 49 49
48 49 49 50
49 50 50 51
50 50 51 51
51 51 52 52
52 52 52 53
52 53 53 53
53 53 54 54
54 54 55 55
55 55 56 56
56 56 56 56
57 58 59 59
60 61
62 63
62 62 63 63
GAS FLOW IN CUBIC FEET PER HOUR
SEC. FLOW SEC. FLOW SEC. FLOW SEC. FLOW
8 900
9 800
10 720
11 655
12 600
13 555
14 514
15 480
16 450
17 424
18 400
19 379
20 360
21 343
22 327
23 313
24 300
25 288
26 277
27 267
28 257
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
RATING
BTUH
60,000
80,000
100,000
10000
120,000
Note:
47
48
The LP Conversion Kit used with the modulating furnace
50
is BAYLPSS220B or BAYLPKT220B.
50
51
52
52
52
53
54
54
55
56
57
60
63
64
18-CD30D1-20-EN
Installer's Guide
TABLE 18
2 CUBIC FOOT DIAL
29 248 50 144
30 240 51 141
31 232 52 138
32 225 53 136
33 218 54 133
34 212 55 131
35 206 56 129
36 200 57 126
37 195 58 124
38 189 59 122
39 185 60 120
40 180 62 116
41 176 64 112
42 172 66 109
43 167 68 106
44 164 70 103
45 160 72 100
46 157 74 97
47 153 76 95
48 150 78 92
49 147 80 90
MAIN BURNER ORIFICE
NUMBER
DRILL SIZE
OF
BURNERS
NAT. GAS
3 45
4 45
5 45
6 45
82 88
84 86
86 84
88 82
90 80
92 78
94 76
96 75
98 73
100 72
104 69
108 67
112 64
116 62
120 60
124 58
128 56
132 54
136 53
140 51
144 50
LP GAS
56
56
56
56
37