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Installation Instructions
HIGH ALTITUDE DERATE
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 13 for help in selecting orifices if orifice change is
required.
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
Orifice
ALTITUDE ABOVE SEA LEVEL
Twist Drill
Size If
and Orifice Required At Other Elevations
Installed
At Sea
Level
2000 3000 4000 5000 6000 7000 8000 9000 10000
42
42
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44
45
45
45
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
Page 16
TABLE 12
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
TABLE 13
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44
44
45
46
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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
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.
Inlet Pressure
Boss (opt.)
88
White-Rodgers 36G gas valve
86
84
82
80
On/Off ff Swi
78
76
75
73
72
69
67
64
62
60
58
56
White-Rodgers 36F gas valve
54
53
51
LIGHTING INSTRUCTIONS
50
DO NOT attempt to manually light the burner. Failure to
follow this warning could result in property damage, per-
sonal injury or death.
Lighting instructions appear on each unit. Each installation
must be checked out at the time of initial start up to insure proper
operation of all components. Check out should include putting the
unit through one complete cycle as outlined below.
Turn on the main electrical supply and set the thermostat above
47
the indicated temperature. The ignitor will automatically heat,
48
then the gas valve is energized to permit the flow of gas to the
50
burners. After ignition and flame is established, the flame control
50
module monitors the flame and supplies power to the gas valve
51
until the thermostat is satisfied.
52
TO SHUT OFF
56
57
For complete shutdown: Move the control switch on the main gas
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valve to the "OFF" position (See Figure 17 & 18). Disconnect the
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electrical supply to the unit.
64
Outlet Pressure Boss
On/Off Switch
FIGURE 17
Switch
ch
FIGURE 18
▲
WARNING
!
Pub. No. 41-5010-20
Regulator
Adjust
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