Williams 509622A Owner's Manual & Installation Instructions page 17

REAR OUTLET KIT INSTALLATION (OPTIONAL)
If a Rear Outlet Register Accessory is used, the following
procedure must be completed before placing furnace body
into wall recess. Figure 11 Attach speed nuts to outer shield
and remove knockout plates from both the outer and inner
shields as follows:
1. Punch in the lower corners with a screwdriver blade.
2. Break the knockout side and bottom connecting tabs
by holding a screwdriver blade sideways against the
tab and striking the head of the screwdriver lightly with
a hammer.
3. Swing the plate outward; bend it back and forth to
break the top tabs. Use caution when handling sharp
metal edges.
CAUTION: Do not install rear outlet kit where grille may
be blocked by a door, curtains, or any other obstruction.
WARNING: Never shear or cut the furnace legs.
FIGURE 11 – REMOVE KNOCKOUT PLATES
INNER SHIELD
10 - 24 SPEED NUT
Attaching Your Furnace
After furnace is in position, install rear outlet register as
shown in Figure 12. Have damper in open position when
inserting the assembly. Secure the rear outlet register to
speed nuts with the machine screws furnished.
FIGURE 12 – MOUNTING REAR OUTLET REGISTER
Gas Supply and Piping
The gas control valve, in the furnace, is shipped with a seal
over the gas inlet tapping. Do not remove the seal until ready
to connect the piping.
KNOCKOUT PLATE
ON OUTER SHIELD
HOLD SCREWDRIVER
SIDEWAYS AGAINST
TABS AND STRIKE
LIGHTLY WITH
HAMMER
GAS SUPPLY
For propane gas the minimum inlet gas supply pressure
for the purpose of input adjustment is 11-inches water
column. The maximum inlet gas supply pressure is
13-inches water column.
For natural gas, the minimum inlet gas supply pressure for
the purpose of input adjustment is 5-inches water column.
The maximum inlet as supply pressure is 7-inches water
column.
continued
Gas pressure and input to the burners must not exceed
the rated input and pressure shown on the nameplate.
The natural gas manifold pressure should be 4-inches
water column. The manifold pressure should be 10-inches
water column for propane gas. For operation in elevations
above 2,000 feet, a burner orifice change may be required to
suit the gas supplied. Check with your local gas supplier.
FURNACE SHIELDS
PLASTER GROUND
REAR REGISTER
OUTLET
WARNING: Danger of property damage, bodily
injury or death. Make sure the furnace is equipped to
operate o the type of gas available. Models designed
as natural gas are to be used with natural gas only.
Models designed for use with liquefied petroleum
propane gas have orifices sized for commercially pure
propane gas. They cannot be used with butane or a
mixture of butane and propane.
MONTEREY TOP VENT GAS WALL HEATER
17