18-CD30D1-20-EN
37
Installer’s Guide
Orifice
Twist
Drill
Size If
In-
stalled
At Sea
Level
ALTITUDE ABOVE SEA LEVEL
and Orifice Required At Other Elevations
2000 3000 4000 5000 6000
7000
8000
9000
10000
42
43
44
45
46
47
48
49
42
44
45
46
47
48
49
50
43
44
45
47
47
48
49
50
43
44
45
47
47
49
49
50
43
45
46
47
48
49
50
51
44
45
47
48
48
49
50
51
44
46
47
48
49
50
50
51
45
47
48
49
49
50
51
52
46
47
48
49
50
51
51
52
47
48
50
50
51
52
52
52
50
51
52
53
54
55
56
57
58
51
51
52
54
54
55
56
58
59
51
52
53
54
55
55
56
59
60
51
52
53
54
55
55
57
59
60
51
52
53
54
55
56
57
60
61
52
52
53
54
55
56
57
60
62
52
53
53
54
55
56
58
61
62
52
53
54
55
56
56
59
62
63
53
53
54
55
56
56
59
63
63
53
54
54
55
56
57
60
63
64
From National Fuel Gas Code - Table F-4
TABLE 17
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.
Note:
The LP Conversion Kit used with the modulating furnace
is BAYLPSS220B or BAYLPKT220B.
Table 19 ORIFICE SIZES
INPUT
RATING
BTUH
NUMBER
OF
BURNERS
MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS
LP GAS
60,000
80,000
100,000
120,000
3
4
5
6
45
45
45
45
56
56
56
56
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
50
144
82
88
9
800
30
240
51
141
84
86
10
720
31
232
52
138
86
84
11
655
32
225
53
136
88
82
12
600
33
218
54
133
90
80
13
555
34
212
55
131
92
78
14
514
35
206
56
129
94
76
15
480
36
200
57
126
96
75
16
450
37
195
58
124
98
73
17
424
38
189
59
122
100
72
18
400
39
185
60
120
104
69
19
379
40
180
62
116
108
67
20
360
41
176
64
112
112
64
21
343
42
172
66
109
116
62
22
327
43
167
68
106
120
60
23
313
44
164
70
103
124
58
24
300
45
160
72
100
128
56
25
288
46
157
74
97
132
54
26
277
47
153
76
95
136
53
27
267
48
150
78
92
140
51
28
257
49
147
80
90
144
50
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
SIZE
PART
NUMBER
DRILL
SIZE
PART
NUMBER
44
45
46
47
48
49
50
51
ORF00501
ORF01427
ORF00909
ORF01429
ORF01099
ORF00503
ORF00493
ORF00494
52
53
54
55
56
57
58
59
ORF00495
ORF00504
ORF00555
ORF00693
ORF01428
ORF00908
ORF01338
ORF01339