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The 58MEB Multipoise Condensing Gas-Fired Furnaces are CSA
(formerly AGA and CGA) design-certified for natural and
propane gases (see furnace rating plate) and for installation in
alcoves, attics, basements, closets, utility rooms, crawlspaces, and
garages. The furnace is factory-shipped for use with natural gas.
A CSA listed gas conversion kit is required to convert furnace for
use with propane gas.
See Fig. 3 for required clearances to combustibles.
Maintain a 1-in. (25.4 mm) clearance from combustible materials
to supply air ductwork for a distance of 36 inches (914 mm)
horizontally from the furnace. See NFPA 90B or local code for
further requirements.
These furnaces SHALL NOT be installed directly on carpeting,
tile, or any other combustible material other than wood flooring.
In downflow installations, factory accessory floor base MUST be
used when installed on combustible materials and wood flooring.
Special base is not required when this furnace is installed on
manufacturer's Coil Assembly Part No. CAP, CAR or CNPV,
CNRV, or when Coil Box Part No. KCAKC is used.
The 58MEB 040 through 120 size units are CSA design-certified
for use in manufactured (mobile) homes when installed as a
2-pipe (direct vent) furnace and a factory accessory conversion
kit is used. These furnaces are suitable for installation in a
structure built on site or a manufactured building completed at
final site. The design of this furnace line is NOT CSA
design-certified for installation in recreation vehicles or outdoors.
This furnace is designed for continuous return-air minimum
temperature of 60°F (16°C)db or intermittent operation down to
55°F (13°C) db such as when used with a night setback
thermometer. Return-air temperature must not exceed 80°F (27°
C) db. Failure to follow these return air limits may affect
reliability of heat exchangers, motors and controls. (See Fig. 4.)
These furnaces are shipped with the drain and pressure tubes
connected for UPFLOW applications. Minor modifications are
required when used in DOWNFLOW, HORIZONTAL RIGHT, or
HORIZONTAL
LEFT
(supply-air
applications
as
shown
Applications section.
Install this furnace only in a location and position as specified in
LOCATION and INSTALLATION sections of these instructions.
Always provide adequate combustion and ventilation air as
specified in section Combustion Air and Vent Pipe Systems of
these instructions to the furnace.
Combustion products must be discharged outdoors. Connect this
furnace to an approved vent system only, as specified in the
Combustion Air and Vent piping sections of these instructions.
Never test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for detection of leaks to
check all connections as specified in the GAS PIPING section of
these instructions.
Always install the furnace to operate within the furnace's
intended rise range with a duct system which has an external
static pressure within the allowable range as specified in the SET
discharge
direction)
in
Fig.
1.
See
details
TEMPERATURE RISE section of these instructions. See furnace
rating plate.
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 ducts sealed to the
furnace casing and terminating outside the space containing
the furnace.
A gas-fired furnace for installation in a residential garage must be
installed as specified in the Hazardous Locations section of these
instructions.
The furnace may be used for construction heat provided that the
furnace installation and operation complies with the first
CAUTION in the LOCATION section of these instructions.
This gas furnace may be used for construction heat provided that:
S 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.
S The furnace is controlled by a thermostat. It may not be "hot
wired" to provide heat continuously to the structure with out
thermostatic control.
S 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.
S 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.
in
S 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.
S The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.
S 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.
S After construction is complete, verify furnace operating
conditions including ignition, input rate, temperature rise and
venting, according to the manufacturer's instructions.
The furnace shall be installed so that the electrical components
are protected by water.
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