Allied 80G2UH-V, Installation Instructions Manual

507335-01

Page 5 of  44

Issue 1624

Temperature Rise

NOTE:

Furnace must be adjusted to obtain 

a 

temperature 

rise (high and low fire) within the range(s) 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.

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 recommend 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 

construction. Temporary ducting may supply outdoor 

air to the furnace. Do not connect duct directly to 

the furnace. Size the temporary duct following these 

instructions in section for Combustion, Dilution and 

Ventilation Air in a confined space with air from outside.

•

  The furnace heat exchanger, components, duct system, 

air  filters  and  evaporator  coils  must  be  thoroughly 

cleaned following final construction clean-up.

•

  All furnace operating conditions (including ignition, input 

rate,  temperature  rise  and  venting)  must  be  verified 

according to these installation instructions.

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.

Figure 2

Heating Unit Installed Parallel to Air Handler Unit

Heating Unit Installed Upstream of Cooling Unit