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• If necessary, adjust the manifold pressure at the gas valve by removing the regulator cap and
turning the adjustment screw clockwise to raise the pressure and counterclockwise to reduce
the pressure. The manifold pressure must be between 3.2" W.C. and 3.8" W.C. for natural gas
and 9.5"W.C. and 10.5" W.C. for LP ( a field conversion is necessary for LP). The inability to
maintain the proper pressure range will require reorificing. After replacing the orifices, repeat
the above steps to insure that the furnace input is adjusted properly.
• Turn off gas and electrical supply, remove manometers and replace any plugs which were
removed. Use a pipe joint compound which is suitable for use with LP gas.
• Restore any other appliances affected to their normal operating mode.
METER TIME IN MINUTES AND SECONDS FOR NORMAL INPUT RATING OF FURNACES EQUIPPED FOR USE
WITH NATURAL GAS AT 0 - 2,000 FEET ALTITUDE.
INPUT
Btu/hr
METER
SIZE
FT 3
HEAT
VAL UE
1,100
MIN. SEC.
HEAT
VALUE
900
MIN.
SEC.
1 21
13 30
0 54
9 00
0 41
6 45
0 32
5 24
0 27
4 30
HEAT
VAL UE
1,000
MIN.
SEC.
1 30
15 00
1 00
10 10
0 45
7 30
0 36
6 00
0 30
5 00
HEAT
VALUE
1040
MIN.
SEC.
1 33
15 36
1 O3
10 24
0 47
7 48
0 37
6 14
0 31
5 12
40,000 1 1 39
10 16 30
60,000 1 1 06
10 11 00
80,000 1 0 50
10 8 15
100,000 1 0 40
10 6 36
120,000 1 0 33
10 5 30
I
MAIN BURNER ADJUSTMENT
The main burners should not need adjustment in most instances. However, air shutters are
provided should adjustment be necessary.
After the furnace has been in operation for at least five (5) minutes loosen the shutter locking
screw and close the shutter until yellow tipped flames appear. Now slowly open the shutters until
the yellow disappears. Retighten the locking screw.
1
I SAFETY CONTROL FUNCTIONS AND CHECK-OUT PROCEDURE ]
GENERAL
In most cases the safety controls are wired is series with the "W" leg. It is imperative that these
switches remain in the circuit. Never jumper, relocate (unless as noted on the furnace) or bypass
any control. The safety controls must be checked for proper operation at the time of start-up of
the furnace.
WARNING I
SHOULD ANY SAFETY CONTROL BE ALTERED, JUMPERED OR BYPASSED, A I
HAZARDOUS CONDITION SUCH AS FIRE OR THE POSSIBILITY OF CARBON MONOXIDE I
ENTERING THE BUILDING MAY OCCUR. I
IO-151 15
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