Gas Supply And Piping Requirements - Williams 4505622A Owner's Manual

Installing Your Furnace

Gas Supply and Piping Requirements

Gas pipe must be installed by a qualified installer. The pipe
system must comply with the latest edition of the American
National Fuel Gas Code 2223.1. Figure 5 depicts the required
pipe arrangement at the furnace. The drip leg is required to
prevent condensate and scale particles from entering the furnace
controls. The union is required to allow the control to be removed
for servicing. All unions in gas pipe systems shall be of the ground
joint type. Use a pipe joint compound that is resistant to L.P. Gas.
Do not locate pipe joints in a concealed location where leak
detection and repairs are difficult or impossible.
The maximum inlet supply pressure for this furnace must be 7
inches for natural gas and 13 inches for L.P. Gas. The minimum
inlet supply pressure for the purpose of input adjustment must be
5 inches for natural gas and 11 inches for L.P. Gas. The control on
this furnace is equipped with a regulator which reduces the
manifold pressure to 4.0 inches for natural gas and 10.0 inches
for L.P. Gas.
FIGURE 5
UNPACKING AND INSPECTION
Remove the furnace from the carton and inspect carefully for
shipping and handling damage or missing parts. Report any
damage or missing parts to your Williams dealer and be sure all
problems are resolved before installing the furnace.
Furnace to Gas Supply Line Connection
If the furnace is equipped for L.P. Gas, the gas tank must be
provided with a regulator which will reduce the line pressure to the
furnace to between 11 and 13 inches water column. Unregulated
L.P. Gas pressure will damage the control and cause it to leak
hazardously.
CAUTION: The furnace and its individual shutoff
valve must be disconnected from the gas supply
piping system during pressure testing of that system
at test pressures in excess of 1/2 psi. The furnace
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 psi.
Pressures in excess of 1/2 psi will cause damage to
the control valve and may cause damage to the
shutoff valve.
WARNING: DO NOT INSTALL A DAMAGED
FURNACE.
A furnace that is damaged or in poor repair can be
hazardous.