Clearances To Combustibles - Carrier 58MCB Installation, Start-Up, And Operating Instructions Manual

Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in literature, on tags, and
on labels attached to or shipped with unit and other safety
precautions that may apply.
These instructions cover the minimum requirements and conform
to existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residen-
tial construction practices. We require these instructions as a
minimum for a safe installation.
Wear safety glasses and work gloves. Have a fire extinguisher
available during start-up and adjustment procedures and service
calls.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when han-
dling parts.
Recognize safety information. This is the safety-alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand these signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
The 58MCB 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. clearance from combustible materials to supply air
ductwork for a distance of 36 inches 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. CD5 or CK5, or when Coil
Box Part No. KCAKC is used.
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The 58MCB 040 through 120 size units are CSA (formerly AGA
and CGA) 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. The 140 size unit is NOT
design-certified for use in manufactured (mobile) homes. 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 db or intermittent operation down to 55°F db
such as when used with a night setback thermostat. Return-air
temperature must not exceed 80°F 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 discharge direction) applica-
tions as shown in Fig. 1. See details in Applications section.
Install this furnace only in a location and position as specified in
LOCATION and INSTALLATION sections of these instructions.
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Always provide adequate combustion and ventilation air as speci-
fied 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.
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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 TEMPERA-
TURE RISE section of these instructions and 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.
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The furnace may be used for construction heat provided that the
furnace installation and operation complies with the first CAU-
TION in the LOCATION section of these instructions.
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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.
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