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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 Z223.1. 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 liquified petroleum gases (LPG). 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 LP gas. The
minimum inlet supply pressure for the purpose of input
adjustment must be 5 inches for natural gas and 11 inches
for LP gas. The control on this furnace is equipped with a
regulator which reduces the manifold pressure to 4.0 inch-
es for natural gas and 10.5 inches for LP gas.
If the furnace is equipped for LP 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 LP 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 psig 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 psig Pressures in
excess of 1/2 psig will cause damage to the control valve
and may cause damage to the shutoff valve.
FIRST FLOOR r.
m
GRILLE
STUD FRAME
FLOOR FURNACE
ROOM
@
p LIMIT SW1TCH
LEC_-- I I _--UNtON k
DRIP
f " SHUT-OFF
CAP VALVE CONTROL VALVIZ
_ HERMOSTA"
LEAD V_RES
FIGURE 5
UNPACKING AND INSPECTION
Remove the furnace from the carton and inspect carefully be sure all problemsare resolvedbefore installingthefurnace
for shipping and handling damage or missing parts Report DO NOT INSTALL A DAMAGED FURNACE. A furnace
any damage or missing parts to your Williams dealer and that is damaged or in poor repair can be hazardous
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