1083163-UIM-J-0918
Johnson Controls Unitary Products
9
HORIZONTAL FILTERS
Any branch duct (rectangular or round duct) attached to the plenum
must attach to the vertical plenum before the filter. The use of straps
and/or supports is required to support the weight of the external filter
box.
DOWNFLOW FILTERS
Downflow furnaces typically are installed with the filters located above
the furnace, extending into the return air plenum or duct. Any branch
duct (rectangular or round duct) attached to the plenum must attach to
the vertical plenum above the filter height.
Filter(s) may be located in the duct system external to the furnace using
an external duct filter box attached to the furnace plenum or at the end
of the duct in a return filter grille(s). The use of straps and/or supports is
required to support the weight of the external filter box.
SECTION IV: GAS PIPING
GAS SAFETY
GAS PIPING INSTALLATION
Properly sized wrought iron, approved flexible or steel pipe must be
used when making gas connections to the unit. If local codes allow the
use of a flexible gas appliance connection, always use a new listed con-
nector. Do not use a connector that has previously serviced another gas
appliance.
Some utility companies or local codes require pipe sizes larger than the
minimum sizes listed in these instructions and in the codes. The furnace
rating plate and the instructions in this section specify the type of gas
approved for this furnace - only use those approved gases. The instal-
lation of a drip leg and ground union is required. Refer to Figure 11.
For left side supply gas pipe arrangement, two 1/2” elbows and two 1/2”
x 1-1/2” pipe nipples must be used. The arrangement shown in Figure
11 aligns entrance hole in furnace casing with supply gas pipe. Furnace
casing does not support installations completed using street-elbows.
DANGER
An overpressure protection device, such as a pressure regulator,
must be installed in the gas piping system upstream of the furnace
and must act to limit the downstream pressure to the gas valve so it
does not exceed 0.5 psig (14" w.c., 3.48 kPa). Pressures exceeding
0.5 PSI (14” w.c., 3.48 kPa) at the gas valve will cause damage to the
gas valve, resulting in a fire or explosion or cause damage to the fur-
nace or some of its components that will result in property damage
and loss of life.
FIGURE 10:
Gas Valve
!
Inlet
Wrench
Boss
Inlet
Pressure
Port
ON
OFF
On/Off Switch
(Shown in ON position)
Main Regulator
Adjustment
Outlet
Outlet
Pressure
Port
Vent Port
IMPORTANT
Plan the gas supply routing before determining the correct gas pipe
entry. Use 90° conventional elbow(s) and short pipe nipples to enter
through the cabinet access holes.
FIGURE 11:
Left Side Supply Gas Pipe Arrangement
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FIGURE 12:
Gas Piping
Upflow
Configuration
Downflow
Configuration
Horizontal
Configuration
External
Manual
Shut-off
Valve
External
Manual
Shut-off
Valve
External Manual
Shut-off Valve
To Gas
Supply
To Gas
Supply
To Gas
Supply
To Gas
Supply
To Gas
Supply
To Gas
Supply
Drip
Leg
Drip
Leg
Drip
Leg
Drip
Leg
Drip Leg
Drip
Leg
Gas
Pipe
Gas
Valve
Gas
Pipe
Gas
Valve
Gas
Pipe
Gas
Valve
Ground
Union
Ground
Union
Ground
Union
Ground
Union
Ground
Union
Ground
Union
NOTE: Ground Union maybe installed inside or outside unit.
