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Installer's Guide
TABLE 9
FINAL MANIFOLD PRESSURE SETTINGS (inches w.c.)
FUEL
2nd Stage Max.
NATURAL GAS
3.5" W.C.
LP GAS
10.5" W.C.
TABLE 10
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 11
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GAS
FOR VARIOUS PIPE SIZES AND LENGTHS
LENGTH OF PIPE
PIPE
SIZE
10
20
30
1/2
132
92
73
3/4
278
190
152
1
520
350
285
1-1/4
1050
730
590
This table is based on pressure drop of 0.3 inch W.C. and 0.6 SP.GR. gas
TABLE 12
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 clock-
ing the gas flow rate (CFH) and multiplying by the heating
value obtained from the local utility supplier for the gas be-
ing 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 pres-
sure, then the orifices must be changed. LP installations
will require an orifice change.
20
1st Stage Max.
1.7" W.C.
6.0" W.C.
MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS
LP GAS
45
56
45
56
45
56
45
56
45
56
45
56
40
50
60
70
63
56
50
46
130
115
105
96
245
215
195
180
520
440
400
370
DRILL
PART
SIZE
NUMBER
54
ORF00555
55
ORF00693
56
ORF00907
57
ORF00908
58
ORF01338
59
ORF01339
Important:
Reinstall the propane orifices to the same depth as the orifices
supplied with the equipment.
See Table 14 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 Conver-
sion Kit available with this furnace.
TABLE 13
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
TABLE 14
Orifice
ALTITUDE ABOVE SEA LEVEL
Twist Drill
and Orifice Required At Other Elevations
Size If
Installed
2000 3000 4000 5000 6000 7000 8000 9000 10000
At Sea
Level
42
42
43
43
43
44
44
44
44
45
45
45
45
46
47
47
46
47
47
47
47
48
48
49
54
54
55
55
55
55
55
55
56
56
56
57
57
58
59
59
58
59
60
60
From National Fuel Gas Code - Table F-4
50
144
82
51
141
84
52
138
86
53
136
88
54
133
90
55
131
92
56
129
94
57
126
96
58
124
98
59
122
100
60
120
104
62
116
108
64
112
112
66
109
116
68
106
120
70
103
124
72
100
128
74
97
132
76
95
136
78
92
140
80
90
144
43
44
44
45
46
45
45
46
47
47
46
47
47
48
48
47
48
48
49
49
48
48
49
49
50
49
49
50
50
51
55
55
55
56
56
56
56
56
56
56
57
57
58
59
59
60
60
61
62
63
61
62
62
63
63
18-CD31D1-3
88
86
84
82
80
78
76
75
73
72
69
67
64
62
60
58
56
54
53
51
50
47
48
50
50
51
52
56
57
60
63
64
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