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".
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, "Dimensions".
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
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
Pressure 
Vent Port
Port
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Wrench | OFF |
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Boss | ON |
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Inlet | Main Regulator | ||
Pressure | On/Off Switch | Adjustment | |
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FIGURE 14: Gas Valve
Plan your gas supply before determining the correct gas pipe entry. Use
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".
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Drip Leg | Grounded Joint Union |
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may be Installed |
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FIGURE 15: Upflow/Downflow Gas Piping |
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| Gas | Leg |
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| Pipe | Gas Burners |
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| Gas | Gas Valve |
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FIGURE 16: Horizontal Gas Piping |
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An accessible manual shutoff valve must be installed upstream of the furnace gas controls and within 6 feet (1.8 m) of the furnace.
Johnson Controls Unitary Products | 9 |
