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•
IN GENERAL
•
The operation of exhaust fans, compressors, air
handling units etc. can rob air from the room, creating
a negative pressure condition leading to reversal of the
natural draft action of the venting system. Under these
circumstances an engineered air supply is necessary.
•
If the appliance is to be installed near a corrosive or
potentially corrosive air supply, the appliance must be
isolated from it and outside air should be supplied as
per code.
•
Potentially corrosive atmospheres will result from
exposure to permanent wave solution, chlorinated
waxes
and
cleaners,
chemicals,
carbon
refrigerants, Freon cleaning solvents, hydrochloric
acid, cements and glues, masonry washing materials,
antistatic fabric softeners, dry cleaning solvents,
degreasing liquids, printing inks, paint removers, etc.
•
The equipment room MUST be provided with properly
sized openings to assure adequate combustion air and
proper ventilation when the unit is installed with a
proper venting system.
chlorine,
water
softening
tetrachloride,
halogen
based
PART 3
GAS CONNECTION
Verify that the appliance is supplied with the type of gas
specified on the rating plate. Consult factory for installations
at high altitude.
3.1
GAS CONNECTION
•
Safe operation of unit requires properly sized gas supply
piping. See gas line sizing data.
•
Gas pipe size may be larger than appliance connection.
•
Installation of a union at the appliance gas line
connection is required for ease of service and removal of
the gas train.
•
Install a manual main gas shutoff valve, outside of the
appliance gas connection as require by local codes.
•
A trap (drip leg) MUST be provided in the inlet gas
connection to the appliance.
•
Optional gas controls may require routing of bleeds and
vents to the atmosphere, outside the building when
required by local codes.
Table 7: Recommended Gas Pipe Size
Single Appliance Installation
(For distance from natural gas meter or propane second
stage regulator)
Input
0-100 FT
Btu/Hr,
NAT.
L.P.
x1000
80
¾"
½"
100
¾"
½"
150
1"
¾"
199
1"
¾"
250
1 ¼"
1"
299
1 ¼"
1"
399
1 ¼"
1"
500
1 ½"
1 ¼"
600
1 ½"
1 ¼"
700
2 "
1 ½"
800
2 "
1 ½"
3.2
GAS PIPING
All gas connections must be made with pipe joint compound
resistant to the action of liquefied petroleum and natural gas.
All piping must comply with local codes and ordinances.
3.3
INSTALL PIPING
•
The gas line should be sufficient to handle the total
installed capacity. Verify pipe size with your gas supplier.
•
Use approved piping as per code free from burrs.
•
Install a manual main gas shutoff valve at the appliance
gas inlet, outside of the appliance and before the gas
valve.
•
Run pipe to the Appliance gas inlet.
•
Install a sediment trap in the supply line to the Appliance
gas inlet.
•
Apply a moderate amount of good quality pipe
compound.
•
For LP gas, consult your LP gas supplier for expert
installation.
101-200 FT
201-300 FT
NAT.
L.P.
NAT.
¾"
½"
1"
1"
¾"
1"
1 ¼"
1"
1 ¼"
1 ¼"
1"
1 ¼"
1 ¼"
1"
1 ½"
1 ½"
1 ¼"
1 ½"
1 ½"
1 ¼"
2"
2"
1 ½"
2"
2"
1 ½"
2"
3"
2 ½"
3"
3"
2 ½"
3"
L.P.
¾"
¾"
1"
1"
1 ¼"
1 ¼"
1 ½"
1 ½"
1 ½"
2 ½ "
2 ½ "
12
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