Bryant 340MAV instruction manual Furnace Location for Proper Condensate Drainage

NOTE: For upflow/downflow applications install furnace so that it is level or pitched forward within 1/2-in. for proper furnace operation. For horizontal applications pitch 1/4-in. minimum to 1/2-in. maximum forward to ensure proper condensate drainage from secondary heat exchangers. (See Fig. 13.)

When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s) sealed to furnace casing and terminating outside the space containing the furnace to ensure there will not be a negative pressure condition within equipment room or space.

This furnace may be located in a confined space without special provisions for dilution or ventilation air.

LEVEL	(0″ )	FRONT		FRONT
TO			MIN 1⁄4″
1⁄2″ MAX			TO
			1⁄2″ MAX
UPFLOW OR DOWNFLOW				HORIZONTAL

A02146

Fig. 13—Furnace Location for Proper Condensate

Drainage

CAUTION: This gas furnace may be used for construction heat provided that:

-The furnace is permanently installed with all electrical wiring, piping, venting and ducting installed according to these installation instructions. A return air duct is provided, sealed to the furnace casing, and terminated outside the space containing the furnace. This prevents a negative pressure condition as created by the circulating air blower, causing a flame rollout and/or drawing combustion products into the structure.

-The furnace is controlled by a thermostat. It may not be ″ hot wired″ to provide heat continuously to the structure without thermostatic control.

-Clean outside air is provided for combustion. This is to minimize the corrosive effects of adhesives, sealers and other construction materials. It also prevents the entrainment of drywall dust into combustion air, which can cause fouling and plugging of furnace components.

-The temperature of the return air to the furnace is no less than 55°F, with no evening setback or shutdown. The use of the furnace while the structure is under construction is deemed to be intermittent operation per our installation instructions.

-The air temperature rise is within the rated rise range on the furnace rating plate, and the firing rate has been set to the nameplate value. -The filters used to clean the circulating air during the construction process must be either changed ot thoroughly cleaned prior to occupancy.

-The furnace, ductwork and filters are cleaned as necessary to remove drywall dust and construction debris from all HVAC system components after construction is completed.

FRONT

BACK

FRONT

B

A

C

K

A93043

32°F MINIMUM INSTALLED AMBIENT OR FREEZE PROTECTION REQUIRED

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Fig. 14—Prohibit Installation on Back

WARNING: Do not install furnace on its back. Safety control operation will be adversely affected. Never con- nect return-air ducts to back of furnace. Failure to follow this warning could result in fire, personal injury, or death. (See Fig. 14.)

CAUTION: If these furnaces are installed in an uncon- ditioned space where the ambient temperatures may be 32°F or lower, freeze protection measures must be taken. Failure to follow this caution will result in minor property or unit damage. (See Fig. 15.)

A93058

Fig. 15—Freeze Protection

II.FURNACE LOCATION RELATIVE TO COOLING EQUIPMENT

The cooling coil must be installed parallel with or on downstream side of furnace to avoid condensation in heat exchanger. When installed parallel with a furnace, dampers or other means used to control flow of air shall prevent chilled air from entering furnace. If dampers are manually operated, they must be equipped with a means to prevent operation of either unit unless damper is in full-heat or full-cool position.

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