Goodman APG 13 Service Instructions Manual page 19

PRODUCT DESIGN
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.
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
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
MANUAL
RESULT IN AN EXPLOSION OR FIRE WHICH COULD
SHUT-OFF
VALVE
CAUSE SERIOUS PERSONAL INJURY OR DEATH.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters (See
DRIP LEG
NBFU Manual 58) or Natural Standards of Canada B149.2,
Installation Code for Propane Gas Burning Appliances and
Equipment.
GROUND JOINT UNION
(INSTALLED AHEAD OF GAS VALVE)
For satisfactory operation, propane gas pressure must be 10
inch W.C. at the unit manifold with all gas appliances in
operation. Maintaining proper gas pressure depends on
three main factors.
1. Vaporization rate, which depends on (a) temperature of
2. Proper pressure regulation. (Two-stage regulation is
3. Pressure drop in lines between regulators, and between
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is avail-
able from most regulator manufacturers and propane gas
suppliers.
Propane is an excellent solvent, and special pipe dope must
be used when assembling piping for this gas as it will quickly
dissolve white lead or most standard commercial com-
pounds. Shellac base compounds resistant to the actions
of liquefied petroleum gases such as Gasolac®, Stalactic®,
Clyde's or John Crane are satisfactory.
WARNING
the liquid, and (b) "wetted surface" area of the container
or containers.
recommended from the standpoint of both cost and
efficiency.)
second stage regulator and the appliance. Pipe size
required will depend on length of pipe run and total load
of all appliances.
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