PRODUCT DESIGN
18
The gas pipe supplying the unit must be properly sized based
on the cubic feet per hour of gas flow required, specific gravity
of the gas and length of the run. The gas line installation must
comply with local codes, or in the absence of local codes,
with the latest edition of the National Fuel Gas Code ANSI
Z223.1.
NATURAL GAS CAPACITY OF PIPE IN CUBIC FEET OF
GAS PER HOUR (CFH)
LENGTH OF
PIPE IN FEET
NOMINAL BLACK PIPE SIZE
1/2"
3/4"
1"
1 1/4"
1 1/2"
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
BTUH FURNACE INPUT
CALORIFIC VALUE OF GAS
CFH =
CONNECTING THE GAS PIPING - NATURAL GAS
1. Use black iron or steel pipe and fittings for the building
piping.
2. Use pipe joint compound on male threads only. Pipe joint
compound must be resistant to the action of the fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can enter
the gas valve. The drip leg must be a minimum of three
inches long.
5. Use two pipe wrenches when making connection to the
gas valve to keep it from turning.
6. Install a manual shut off valve. This shut off valve should
be conveniently located within six (6) feet of the unit, and
between the meter and unit.
7. Tighten all joints securely.
8. Connect the unit to the building piping by one of the
following methods.
a.
Rigid metallic pipe and fittings.
b.
Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing shall not be used in exterior
locations.
c.
Listed gas appliance connectors used in accor-
dance with the terms of their listing that are
completely in the same room as the equipment.
NOTE:
In "b" and "c", the connector or tubing must be
installed so as to be protected against physical and thermal
damage. Aluminum-alloy tubing and connectors must be
coated to protect against external corrosion where they are in
contact with masonry, plaster, or insulation or are subject to
repeated wettings by such liquids as water (except rain
water), detergents, or sewage.
DRIP LEG
MANUAL
SHUT-OFF
VALVE
GROUND JOINT UNION
(INSTALLED AHEAD OF GAS VALVE)
GROMMET
NOTE:
The unit gas supply entrance is factory sealed with
plugs. Keep plugs in place until gas supply is ready to be
installed. Once ready, replace the plugs with the supplied
grommets and install gas supply line.
CHECKING THE GAS PIPING
CAUTION
TO AVOID THE POSSIBILITY OF PROPERTY DAMAGE,
PERSONAL INJURY OR FIRE, THE FOLLOWING
INSTRUCTIONS MUST BE PERFORMED REGARDING
GAS CONNECTIONS AND PRESSURE TESTING.
The unit and its gas connections must be leak tested before
placing in operation. Because of the danger of explosion or
fire, never use a match or open flame to test for leaks. Never
exceed specified pressure for testing. Higher pressure may
damage the gas valve and cause overfiring which may result
in heat exchanger failure.
This unit must be isolated from the gas supply system by
closing its individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures
equal to or less than 1/2 PSIG (3.48 kPa).
TANKS AND PIPING - PROPANE UNITS
WARNING
PERSONAL INJURY HAZARD
IRON OXIDE (RUST) CAN REDUCE THE LEVEL OF
ODORANT IN PROPANE GAS. A GAS DETECTING
DEVICE IS THE ONLY RELIABLE METHOD TO DETECT
A PROPANE GAS LEAK. CONTACT YOUR LOCAL
PROPANE SUPPLIER ABOUT INSTALLING A GAS
DETECTING WARNING DEVICE TO ALERT YOU IN
THE EVENT THAT A GAS LEAK SHOULD DEVELOP.
FAILURE TO DETECT A PROPANE GAS LEAK COULD
RESULT IN AN EXPLOSION OR FIRE WHICH COULD
CAUSE SERIOUS PERSONAL INJURY OR DEATH.
