Typical Downflow Installation; Installation Requirements - Arcoaire N9MP1 Installation Instruction

Figure 2

Typical Downflow Installation

See Vent Termination
Shielding in Vent Section.
*8" Min.
20' Max.
in same
Inlet Pipe
(not used on
atmospheric
Single Pipe
zone
model)
Vent Pipes MUST be
supported Horizontally
and Vertically
*
Increase minimum from 8" to 18" for cold climates (sustained temperatures
0°F(--18°C) and below for 24 or more consecutive hours).
WARNING
!
CARBON MONOXIDE POISONING HAZARD.
Failure to follow this warning could result in
personal injury or death.
Do NOT operate furnace in a corrosive atmosphere
containing chlorine, fluorine or any other damaging
chemicals, which could shorten furnace life.
Refer to Combustion & Ventilation Air section,
Contaminated Combustion Air for combustion air
evaluation and remedy.
CAUTION
!
FROZEN AND BURST WATER PIPE HAZARD.
Failure to follow this caution may result in property
damage.
Special precautions MUST be made if installing
furnace in an area which may drop below freezing.
This can cause improper operation or damage to
equipment. If furnace environment has the potential
of freezing, the drain trap and drainline must be
protected. The use of electric heat tape or RV
antifreeze is recommended for these installations.
(See "Condensate Trap Freeze Protection Section")
Do NOT operate furnace in a corrosive atmosphere
containing chlorine, fluorine or any other damaging
chemicals. Refer to Combustion & Ventilation Air section,
Contaminated Combustion Air.

Installation Requirements

1. Install furnace level.
2. This furnace is NOT to be used for temporary heat of buildings
or structures under construction.
6
3.
4.
Coupling on inside
and outside of wall
5.
to restrain vent pipe
8" Min.
6.
7.
•
*8" Min.
•
20' Max. in same
atmospheric
zone
8.
25--23--33a
9.
This furnace may be used for construction heat provided that all
the following conditions are met:
•
•
•
•
•
•
•
•
Specifications are subject to change without notice
Install the vent pipes as short as practical. (See Gas Vent
Installation section).
Do NOT install furnace directly on carpeting, tile or other
combustible material other than wood flooring.
Maintain clearance for fire safety and servicing. A front
clearance of 24" required and 30" recommended for access
to the burner, controls and filter. See clearance requirements
in Figure 3.
Use a raised base if the floor is damp or wet at times.
Residential garage installations require:
Burners and ignition sources installed at least 18" above the
floor.
Furnace must be located or physically protected from
possible damage by a vehicle.
If the furnace is to be suspended from the floor joists in a
basement or a crawl space or the rafters in an attic, it is
necessary to use steel pipe straps or an angle iron frame to
attach the furnace. These straps should be attached to the
furnace with sheet metal screws and to the rafters or joists
with bolts. The preferred method is to use an angle iron frame
bolted to the rafters or joists.
Local codes may require a drain pan under the entire furnace
and condensate trap when the furnace is installed in attic
application.
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.
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
rating plate 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.
After construction is complete, verify furnace operating
conditions including ignition, input rate, temperature rise
and venting according to these instructions.
It also prevents the
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