GAS PiPiNG iNSTALLATiON
IMPORTANT: Before making the gas pipe connection give
serious consideration to providing the required clearance nec=
essary to remove the access panels on the unit
(e.g., economizer and filter access panels).
NOTE: In the absence of local codes, the installation must I
conform with American National Standard--Z223.1--National Fuel I
Gas Code, Latest Revision. j
The available gas supply must agree with the required gas supply
marked on the unit nameplate. Minimum permissible gas supply
pressure for purpose of input adjustment must be at least 5.0" W.
C. (inches Water Column) for natural gas and 11' W.C. for propane.
PiPE DELIVERY SCHEDULE (NATURAL GAS ONLY)
NOTE: The following procedure and tables below apply to i
Natural Gas only.
J
1.Obtain from the gas company the heating value and specific
gravity of the gas delivered.
2.Determine the exact length of pipe needed.
3.Read the BTUH input nameplate on the furnace.
4.Use the multiplier opposite the specific gravity of the gas given in
Table 1 below and insert in the following formula:
TABLE 1
MULTIPIER
MULTIPIERS TO BE USED
WHEN THE SPECIFIC
GRAVITY OF THE GAS IS
OTHER THAN 0.60
SPECIFIC
GRAVITY
.50
.55
.60
.65
1.10
1.04
1.00
.962
CFH =
Furnace Input in BTUH
Gas Heat Content in BTU/Cu. Ft. X Multiplier
This will give the factor for columns 2 through 6 in Table 2.
5.Using Table 2, select the pipe length nearest to yours.
6.Follow this line vertically down to the exact CFH found in Step 4
above or the next highest value.
7.Read horizontally to the left of this column for the required pipe
size diameter.
TABLE 2
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GAS
FORVARIOUS PIPE SIZES AND LENGTHS
PIPE LENGTH OF PIPE (feet)
SIZE
(inch) 10 20 30 40 50 60 70
1/2 132 92 73 63 56 50 46
3/4 278 190 152 130 115 105 96
1 520 350 285 245 215 195 180
1-1/4 1050 730 590 520 440 400 370
THiS TABLE IS BASED ON PRESSURE DROP OF 0.3 INCH W.C. AND 0.6 SP.GR. GAS
i NOTE: If this is an propane application, consult your propane
supplier for pipe sizes and deliveries.
GAS PRESSURE SET-UP PRECAUTIONS
WARNING: NEVERUSEANOPENFLAME
TO TEST FOR GAS LEAKS: AN EXPLOSION COULD
OCCUR, CAUSING INJURY OR DEATH.
IMPORTANT: The furnace and its individual shut-off valve
must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressures
exceeding 1/2 psig (3.48 kPa).
The furnace must be isolated from the gas supply piping system by
closing its individual manual shut-off valve during any pressure
testing of the gas supply piping system at test pressures less than
or equal to 1/2 psig (3.48 kPa).
GAS SUPPLY LiNE PRESSURE (ALL FUELS)
Before connecting the unit to the gas supply line, be sure to
determine the gas pressure in the line.
If the gas supply pressure is excessive (above 13.8 inches water
column or 1/2 psig), install a pressure regulator either at the supply
source or in the branch circuit serving the unit. Once the regulator
is installed, set it to provide a maximum pressure of 13.8" W.C. to
the gas valve for natural gas with a minimum supply pressure of 5.0"
W.C. Maximum supply pressure of 13.8" W.C. to the gas valve for
propane with a minimum pressure of 11.0" W.C.
NOTE: Maximum pressure to the gas valve for natural gas
is 13.8" W.C. Minimum pressure is 5.0" W.C. Maximum
pressure to the gas valve for propane is 13.8"W. C. Minimum
pressure to the gas valve is 11.0" W.C.
If the supply line pressure is below the minimum supply pressure
indicated on the unit nameplate, contact the gas supply company.
Follow these steps to complete the installation of the unit gas piping.
See Figure 14.
1. Install a tapped, Style A (1/8-inch NPT tap) shut-off gas cock at
the end of the gas supply line near the unit. Be sure the tapped
gas cock is downstream of the pressure regulator, if used.
®
DEALER INSTALLED
GROUND UNION
1/8" N.P.T.PLUGGED
ACCESS FOR TEST
GAUGE CONNECTION I
FROM _ I _-8"_
GAS SUPPLY _'_ _ _ _ _t MIN
F,ELDSUPFLIE'_DDR_ LEG_ UN.T-_
GAS VALVE, MUST BE
INSTALLED BY DEALER
OUTSIDE UNIT.
/
TO MAIN
CONTROL
VALVE
Page 13
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