Furnace Location Relative to Cooling Equipment. Bryant 345MAV, Series F

• be provided with ample space for servicing and cleaning.

Always comply with minimum fire protection clearances shown on the furnace clearance-to-combustibles label.

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.

32

°

F MINIMUM INSTALLED

AMBIENT OR FREEZE

PROTECTION REQUIRED

A93058

Fig. 15—Freeze Protection

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 or 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.

CAUTION: Do not install furnace in a corrosive or contaminated atmosphere. Make sure all combustion and circulating air requirements are met. Failure to follow this caution will result in intermittent unit operation or performance satisfaction.

III.

HAZARDOUS LOCATIONS

WARNING: When the furnace is installed in a residential garage, it must be installed so that burners and ignition sources are located a minimum of 18 in. above floor. The furnace must be located or protected to avoid physical damage by vehicles. When furnace is installed in a public garage, airplane hangar, or other building having a hazardous atmosphere, unit must be installed in accordance with requirements of National Fire Protection

Association, Inc. (See Fig. 16.)

CAUTION: If these furnaces are installed in an unconditioned space where ambient temperatures may be 32°F or lower, freeze protection measures must be taken. (See

Fig. 15.) Failure to follow this caution will result in minor property damage.

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 be adequate to 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.

—13—

AIR FOR COMBUSTION AND VENTILATION

I.

GENERAL

Provisions for adequate combustion and ventilation air must be provided in accordance with Section 5.3, Air for Combustion and

Ventilation, of the NFGC or applicable provisions of the local building codes.

Canadian installations must be in accordance with Section 7.2 of the Air Supply Determination for Central Heating Furnaces,

Boilers, and Hot Water Heaters, and 7.3, Air Supply Openings and

Ducts, of the NSCNGPIC and all authorities having jurisdiction.