53D0501
9
18/24/30VL Unvented Gas Logs
GAS PIPING and GAS PRESSURE REQUIREMENTS
DANGER
Operation of this appliance on LP gas without
an approved regulator at the supply container
will lead to gas leaks with possible fire or
explosion.
All gas piping must be installed to comply with local codes or, in the absence of local codes, with
the National Fuel Gas Code ANSI Z223.1/NFPA 54. Only flexible hoses listed by a certified agency
may be used.
DANGER
Do not use candles, matches or other ignition
sources when checking for leaks. Fuel gases are
very flammable and, in certain concentrations,
explosive. Checking for leaks with an open flame
may lead to fire or explosion.
CAUTION
The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
system during any pressure testing of that system
at test pressures in excess of 1/2 PSIG (3 kPa).
The appliance must be isolated from the gas
supply piping 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 kPa). Pressures
in excess of 1/2 PSIG (3 kPa) will cause damage
to the control valve and may cause damage to
the shutoff valve.
All gas piping must be installed to comply with local codes or, in the absence of local codes, with the
National Fuel Gas Code ANSI Z223.1/NFPA 54. Do not use flexible hose unless the hose is listed by
a recognized testing agency for use with gas and is approved by the local code authority.
Unions in gas lines shall be of the ground joint type. Compounds used on threaded joints of gas piping
must be resistant to the action of liquefied petroleum gas.
For purpose of input adjustment, the gas piping must be of sufficient size to provide a minimum natural
gas pressure at the appliance of 5 inches water column or 11 inches for LP gases. The maximum
inlet gas pressure to the appliance must not exceed 10 inches for natural gas and 13 inches for LP
gases. If this appliance is to be supplied with LP gas (bottled propane) the tank or bottle supplying
the gas must have a regulator that reduces the gas pressure to between 11 and 13 inches water
column. The control will not operate with gas line pressure directly from the tank and may leak gas
due to this excessive pressure.
Include a manual shutoff valve and union in the line so the appliance may be disconnected for
servicing. Include a drip leg and a plugged 1/8 inch NPT tapping in the line also. The tapping must
be accessible for test gauge connection immediately upstream
of the gas supply connection to the appliance.
Use a soap-water solution or a liquid gas leak detector to
coat each joint in the piping system and look for bubbles
which indicate gas leaks. Repair all gas leaks.
A standard control assembly and typical gas-piping
diagram are shown by Figure 3.
LG569
gas connection
Control Valve
Main Regulator
Union
Gas Supply
Line
Tee
Drip Leg
Shut off Valve
NOTES:
1. Provide a 1/8" NPT plugged tapping for pressure
gauge connection between shutoff valve and main
regulator.
2. For clarity, some appliance plumbing not shown.
LG569
Figure 3
Gas Connection
