Temperature Rise
NOTE: Furnace must be adjusted to obtain a temperature rise within the range specified on the unit nameplate. Failure to do so may cause erratic limit operation and may result in premature heat exchanger failure.
This furnace must be installed so that its electrical components are protected from water.
Installed in Combination with a Cooling Coil
When this furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compartment. See Figure 2. With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately prevent chilled air from entering the furnace. If the damper is manually operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full HEAT or COOL setting. See Figure 2.
Heating Unit Installed Parallel to Air Handler Unit
Heating Unit Installed Upstream of Cooling Unit
Figure 2
When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Electric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/ NFPA No. 70) is available from the following address:
National Fire Protection Association 1 Battery March Park
Quincy, MA 02269
NOTE: This furnace is designed for a minimum continuous return air temperature of 60° F (16°C) or an intermittent operation down to 55° F (13°C) dry bulb for cases where a night setback thermostat is used. Return air temperature must not exceed 85° F (29°C) dry bulb.
This furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the upflow or horizontal position.
This furnace design has not been certified for installation in mobile homes, recreational vehicles, or outdoors.
Use of Furnace as a Construction Heater
Allied Air does not recommended the use of these units as a construction heater during any phase of construction. Very low return air temperature, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit.
Units may be used for heating of buildings or structures under construction, if the following conditions are met:
•The vent system must be permanently installed per these installation instructions.
•A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.
•The return air duct must be provided and sealed to the furnace.
•Return air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained.
•Air filters must be installed in the system and must be maintained during construction.
•Air filters must be replaced upon construction completion.
•The input rate and temperature rise must be set per the furnace rating plate.
•One hundred percent (100%) outdoor air must be provided for combustion air requirements during
•The furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction
•All furnace operating conditions (including ignition, input rate, temperature rise and venting) must be verified according to these installation instructions.
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