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Mounting
Your Furnace
(ton't)
FASTEN FURNACE TOP
(Recessed Mounting)
Fasten furnace top by drilling (2) holes through side flange
furnace top and securing with (2) screws or nails to wall
studs. See Fig. 20, pg. 14.
CAUTION
I
Be careful not to damage furnace components or
wiring when drilling holes.
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WlLUAMS IGNITION CONTROL
PART NUMBER P3219t0
Gas Supply and Piping
Gas control valve, within the furnace, is shipped with a
seal cover gas inlet tapping. Do not remove seal until ready
to connect piping.
WARNING
DANGER OF PROPERTY DAMAGE,
BODILY INJURY OR DEATH.
MAKE SURE THE FURNACE IS EQUIPPED
TO
OPERATE ON THE TYPE OF GAS AVAILABLE.
MODELS DESIGNATED AS NATURAL GAS ARE TO
BE USED WITH NATURAL GAS ONLY. FURNACE
DESIGNATED
FOR
USE
WITH
LIQUEFIED
PETROLEUM
(L.R) GAS HAVE ORIFICES SIZED
FOR COMMERCIALLY
PURE
PROPANE
GAS.
THEY CAN NOT BE USED WITH BUTANE OR A
MIXTURE OF BUTANE AND PROPANE.
GAS SUPPLY
For Natural gas, the minimum inlet gas supply pressure
for the purpose of input adjustment is 5" water column.
The Maximum inlet gas supply pressure is 7" water
column.
For L.IR gas, the minimum inlet gas supply pressure for
the purpose of input adjustment is 11" water column. The
maximum inlet gas supply pressure is 13" water column.
Gas pressures and input to the burners must not exceed
the rated input and pressure shown on the rating plate.
On Natural Gas, the manifold pressure should be 4 inch-
es water column. The manifold pressure should be 10.5
inches water column for LP. Gas See pg. 18 for opera-
tion above 2000 feet altitude.
--15--
Orifice change
may be required to suit gas supplied.
Check with your local gas supplier.
ORIFICE SIZES
Furnace
Technical
Information,
Page 26, shows the
correct orifice sizes for the different input ratings when
using Natural or L.R Gas.
GAS PIPING
The gas supply line must be of an adequate size to
handle the BTU/HR requirements and length of the run
for the unit being installed.
Determine the minimum pipe size from Fig. 25, pg. 16, bas-
ing the length of the run from the gas meter or source
to the unit.
All piping must comply with local codes and ordinances
or with the National Fuel Gas Code (ANSI Z22&l-1988),
whichever applies. In Canada: Follow CAN/CGA B149 In-
stallation Code.
Refer to Fig. 23, pg. 16 for the general layout at the unit.
It shows the basic fittings needed.
The following rules apply:
1. Use new, properly reamed pipe free from chips such
as steel or black
iron pipe and fittings or other
approved by local codes.
2. Do not thread pipe too far. Valve distortion or mal-
function may result from excess pipe within control.
Apply moderate amount of good quality dope to pipe
only, leaving 2 end threads bare. If LP gas installation,
use compound resistant to action of liquefied petroleum
gases.
3. Use ground joint unions.
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