Johnson-controls TG9S*MP User Manual download pdf (Page 9)

364861-UIM-B-0708

Johnson Controls Unitary Products 9

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 13, "Side

Return Cutout Markings".

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 15,

"Upflow/Downflow Gas Piping".

FIGURE 13: 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 shown in Figure 12,

"Dimensions".

All filters and mounting provision must be field supplied. All installa-

tions must have a filter installed.

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 PSI (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 furnace or some of its components that will result in property

damage and loss of life.

Front of

Furnace

Corner

Markings

Side of

Furnace

FIGURE 14: Gas Valve

Plan your gas supply before determining the correct gas pipe entry.

Use 90-degree service elbow(s), or short nipples and conventional

90-degree elbow(s) to enter through the cabinet access holes.

FIGURE 15: Upflow/Downflow Gas Piping

FIGURE 16: Horizontal Gas Piping

An accessible manual shutoff valve must be installed upstream of

the furnace gas controls and within 6 feet (1.8 m) of the furnace.

Inlet

Wrench

Boss

Inlet

Pressure

Port

OFF

On/Off Switch

(Shown in ON position)

Main Regulator

Adjustment

Outlet

Pressure

Port

Vent Port

External Manual

Shutoff Valve

To Gas

Supply

To Gas

Supply

Grounded Joint Union

may be Installed

Inside or Outside Unit.

Drip Leg

Manual

Shut-off

Valve

Gas

Pipe

Gas

Pipe

Drip

Leg

Manual

Shut-off Valve

Gas Valve

Gas Burners

Drip

Leg

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 37 38

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Johnson-controls TG9S*MP User Manual Page 9

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