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See Table 19 & 20 for help in selecting orifices if orifice
change is required. Furnace input rate and tempera-
ture rise should be checked again after changing ori-
fices 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.
TABLE 19
PART NUMBERS FOR REPLACEMENT ORIFICES
DRILL
PART
SIZE
NUMBER
44
ORF00501
45
ORF00644
46
ORF00909
47
ORF00910
48
ORF01099
49
ORF00503
50
ORF00493
REINSTALLATION OF THE BURNER BOX COVER
Figure 56 shows the correct way to reinstall the burner
box cover if adjustment or replacement of the flame
sensor, hot surface igniter, or main burner orifices have
required removal of the cover.
TABLE 20
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
43
43
43
44
44
44
44
45
45
45
45
46
47
47
46
47
47
47
47
48
48
49
48
49
49
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
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for the
venting system being placed into operation could re-
sult in carbon monoxide poisoning or death.
START UP AND ADJUSTMENT
PRELIMINARY INSPECTIONS
With gas and electrical power "OFF"
1. Duct connections are properly sealed
2. Filters are in place
3. Venting is properly assembled
4. Blower door is in place
Flip the switch on main gas valve within the unit to the
"OFF" position. Turn the external gas valve to "ON".
Purge the air from the gas lines. After purging, Check
all gas connections for leaks with a soapy solution —
18-CD29D1-3
DRILL
PART
SIZE
NUMBER
54
ORF00555
55
ORF00693
56
ORF00907
57
ORF00908
58
ORF01338
59
ORF01339
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
50
50
50
51
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
DO NOT CHECK WITH AN OPEN FLAME. Allow 5
minutes for any gas that might have escaped to dissi-
pate. LP Gas being heavier than air may require forced
ventilation. Flip the switch on the gas valve in the unit
to the "ON" position.
U
Inlet Pressure
let Pressure
Boss
Boss (opt.) .)
White-Rodgers 36G gas valve
I
Outlet Pressure Boss
47
48
50
50
51
52
52
Inlet Pressure
56
Boss (opt.)
57
60
White-Rodgers 36J gas valve
63
64
LIGHTING INSTRUCTIONS
SAFETY HAZARD
DO NOT attempt to manually light the burner.
Failure to follow this warning could result in property
damage, personal injury or death.
Lighting instructions appear on each unit. Each instal-
lation 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 thermo-
stat above the indicated temperature. The ignitor will
automatically heat, then the gas valve is energized to
permit the flow of gas to the burners. After ignition and
flame is established, the flame control module monitors
the flame and supplies power to the gas valve until the
thermostat is satisfied.
Installer's Guide
Outlet Pressure Boss
Outlet Pressure Boss
On/Off ff Swi
Switch
ch
On/Off Switch
▲
WARNING
!
Regul ulator
tor
Adjust
Adj
ust
Regulator
Adjustment
35
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