Furnace Location Relative To Cooling Equipment; Location With Respect To Combustion And Circulating Air Requirements; Hazardous Locations - Payne PG9MAB Series A Installation Manual

CAUTION: UNIT DAMAGE HAZARD
This gas furnace may be used for construction heat provided that:
-The furnace is permanently installed with all electrical wiring, piping, air filters, 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 maintained between 55°F (13°C) and 80°F (27°C), 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.
-After construction is complete, verify furnace operating conditions including ignition, input rate, temperature rise and venting,
according to the manufacturer's instructions.
PROCEDURE 2—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.
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in minor property or unit damage.
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. 16.)
PROCEDURE 3—LOCATION WITH RESPECT TO COMBUSTION AND CIRCULATING AIR REQUIREMENTS
WARNING: FIRE, EXPLOSION, INJURY, OR DEATH HAZARD
Improper location or inadequate protection could result in fire or explosion.
When 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 NFGC or
NSCNGPIC (See Fig. 17.)
PROCEDURE 4—HAZARDOUS LOCATIONS
A. Direct Vent Applications
Furnace may be located in a confined space without special provisions for dilution or ventilation air.
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
Fig. 16—Freeze Protection
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