356485-UIM-G-1211

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.

Front of

Furnace

Side of

Furnace

Corner

Markings

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.

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.

HORIZONTAL APPLICATION

Horizontal Filters

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

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

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 PSI (14" w.c. (3.48 kPa). Pressures exceeding

0.5PSI (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.

Outlet

 

Vent Port

Pressure

 

 

 

Port

 

 

Inlet

 

Outlet

Wrench

OFF

 

Boss

ON

 

Inlet

Main Regulator

Pressure

On/Off Switch

Adjustment

Port

 

(Shown in ON position)

 

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.

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.

NOTE: Ground Union maybe installed inside or outside unit.

To Gas

Supply

Ground

Union

Drip

Leg

External

Manual

Shut-off

Valve

Upflow

Configuration

To Gas

To Gas

External

Supply

Supply

Manual

 

 

Shut-off

 

 

Valve

Ground

 

Union

 

 

Gas

 

 

Pipe

 

 

Gas

 

Drip

Valve

 

Leg

Drip

 

 

Leg

 

Downflow

Configuration

To Gas

Supply

Ground

 

Union

 

Gas

 

 

 

To Gas

Valve

 

 

 

 

Supply

 

 

 

Ground

 

 

Drip Leg

Union

 

 

 

 

 

 

 

 

External

Gas

 

 

Manual

Valve

 

 

Shut-off

 

 

 

Valve

Drip

 

 

 

Leg

 

 

To Gas

Gas Pipe

 

 

 

 

Supply

 

 

 

Horizontal

 

 

Ground

 

 

Union

Configuration

Drip Leg

 

FIGURE 15: Gas Piping

10

Johnson Controls Unitary Products

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Johnson Controls GGLS*MP, TGLS*MP, TG8S*MP, GG8S*MP Section IV GAS Piping, Side Return, GAS Safety, GAS Piping Installation

TG8S*MP, GG8S*MP, TGLS*MP, GGLS*MP specifications

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