Johnson Controls TM9T*MP Section IV GAS Piping, Horizontal Filters, Downflow Filters, GAS Safety

505309-UIM-D-0511

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 psig [14" w.c. (3.48 kPa)]. Pressures exceeding

0.5psig [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.

HIGH STAGE REGULATOR
ADJUSTMENT
OUTLET
PRESSURE
PORT	VENT
	PORT
INLET	OUTLET
WRENCH
BOSS
INLET
PRESSURE
PORT	LOW STAGE REGULATOR
ON OFF
SWITCH	ADJUSTMENT

FIGURE 15: 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 16.

To Gas

Supply

Ground

To Gas	NOTE: Ground Union maybe installed inside or outside unit.
Supply		External
			Ground
External		Manual		To Gas
			Union
Manual	Ground	Shut-off		Supply

Shut-off	Union		Valve	To Gas
				Supply
		To Gas
Valve
		Supply

Union

Drip

Leg

Gas

Valve

Gas

Pipe

Drip

Leg Ground

Union

Gas
Pipe	Drip
Upflow	Leg	Downflow

Drip Leg

External Manual

GroundShut-off Valve

Union

Gas

Valve

	Gas	Gas		To Gas
	Valve
Drip		Pipe		Supply
Leg				Ground
		Horizontal	Drip	Union

FIGURE 16: 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.

The furnace must be isolated from the gas supply piping system by closing its individual external manual shutoff valve during any pressure testing of the gas supply piping system at pressures equal to or less than 0.5 psig (3.5 kPa).

The gas valve body is a very thin casting that cannot take any exter- nal pressure. Never apply a pipe wrench to the body of the gas valve when installing piping. A wrench must be placed on the octagon hub located on the gas inlet side of the valve. Placing a wrench to the body of the gas valve will damage the valve causing improper opera- tion and/or the valve to leak.

Gas piping may be connected from either side of the furnace using any of the gas pipe entry knockouts on both sides of the furnace. Refer to Figure 13.

10 Johnson Controls Unitary Products