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

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 propane 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 propane gas.
The minimum inlet supply pressure for the purpose of
input adjustment must be 5 inches for natural gas and
11 inches for propane 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
propane gas.
If the furnace is equipped for propane 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 propane gas pressure will
damage the control and cause it to leak hazardously.
FIGURE 5 - FURNACE TO GAS SUPPLY LINE CONNECTION
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.
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.
WARNING: DO NOT INSTALL A DAMAGED
FURNACE. A furnace that is damaged or in poor repair
can be hazardous.
9
FLOOR FURNACES