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Both the supply and manifold pressure must be measured with the furnace running using the field
supplied pressure tap near the manual shut-off valve and the pressure adjusted if necessary.
All gas piping must conform to local codes, or in the absence of local codes, to the National Fuel
Gas Code ANSI Z223.1 and / or CAN/CGA B149 Installation Codes.
NOTE: COPPER TUBING MUST NOT BE USED FOR NATURAL GAS INSTALLATIONS
WHERE MORE THAN .3 GRAINS OF HYDROGEN SULFIDE PER 100 STANDARD CUBIC
FEET OF GAS IS PRESENT.
FOR INSTALLATIONS IN THE COMMONWEALTH OF MASSACHUSETTS SEE FUEL GAS
AND PLUMBING CODE 248 CMR: APPENDIX C.
Capacity of gas pipe of different diameters and length in ft3/hr, with a pressure drop of 0.3" W.C.
and a specific gravity of 0.60 (natural gas).
PIPE
SIZE*
LENGTH OF PIPE IN FEET
10 20 30 40 50 60 70 80
1/2 132 92 73 63 56 50 46 43
3/4 278 190 152 130 115 105 96 90
1 520 350 285 245 215 195 180 170
1 1/4 1050 730 590 500 440 400 370 350
1 1/2 1600 1100 890 760 670 610 560 530
Nominal size of Iron Pipe in inches.
After the length of pipe has been determined, select the pipe size which will provide the minimum
cubic feet per hour of gas flow for the required input of the appliance. In the case where more
than one appliance utilizes the same supply pipe be sure to consider the sum of all appliances.
The cubic feet of gas required for the appliances should be determined using the following
formula;
Cubic feet of gas required = Gas input of appliance (Btu/hr) / heating value of gas(Btu/hr)
The gas input of the appliance is marked on the specification plate. The heating value of the gas
may be determined by contacting the gas utility or gas supplier.
If the local utility permits the use of a flexible gas connector ALWAYS USE A NEW FLEXIBLE
CONNECTOR. DO NOT USE FLEXIBLE GAS LINES WHICH HA VE SERVICED ANOTHER
APPLIANCE. AFTER A PERIOD OF TIME THESE LINES MAY BECOME BRITTLE AND WITH
THE DISCONNECTION AND RECONNECTION CAN DEVELOP LEAKS.
I CIRCULATING AIR SUPPLY AND RETURN AIR 1
NEVER LAY THIS FURNACE ON IT'S FRONT OR REAR
IO-151 10
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