Danger – Thermo Pride Spirit Gas TG9S Single Stage PSC 95.5% User Manual

Page 10

1083287-UIM-A-0114

Johnson Controls Unitary Products

SIDE RETURN

Locate the “L” shaped corner locators. These indicate the size of the cut-
out to be made in the furnace side panel. Refer to Figure 14.

Install the side filter rack following the instructions provided with that
accessory. If a filter(s) is provided at another location in the return air
system, the ductwork may be directly attached to the furnace side
panel.

HORIZONTAL APPLICATION
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 16.

FIGURE 14: Side Return Cutout Markings

Some accessories such as electronic air cleaners and pleated media
may require a larger side opening. Follow the instructions supplied
with that accessory for side opening requirements. Do not cut the
opening larger than the dimensions for the “Optional Return Air Cut-
out” shown in Figure 13.

All filters and mounting provision must be field supplied. All installa-
tions must have a filter installed.

Front of
Furnace

Corner
Markings

Side of
Furnace

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 psig [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
furnace or some of its components that will result in property damage
and loss of life.

FIGURE 15: Gas Valve

Plan your gas supply before determining the correct gas pipe entry.
Use 90° service elbow(s), or short nipples and conventional 90°
elbow(s) to enter through the cabinet access holes.

DANGER

INLET

WRENCH
BOSS

INLET
PRESSURE
PORT

OFF

ON/OFF SWITCH
(Shown in ON position)

MAIN REGULATOR
ADJUSTMENT

OUTLET

OUTLET
PRESSURE
PORT

VENT PORT

FIGURE 16: Gas Piping

Upflow

Downflow

Horizontal

External
Manual
Shut-off
Valve

External Manual
Shut-off Valve

To Gas
Supply

Drip
Leg

Drip Leg

Drip
L

Gas
Pipe

Gas
Valve

Gas
Pipe

Gas
Valve

Gas
Pipe

Gas
Valve

Ground
Union

NOTE: Ground Union maybe installed inside or outside unit.