Carrier 58CMA Minimum Clearances To Combustible Materials, Location, Installation

Table 1—Minimum Clearances To Combustible Materials (In.)

	UNIT APPLICATION	UPFLOW	DOWNFLOW	HORIZONTAL
	Furnace	0	2	2
Sides
	Supply Plenum and Warm-Air Duct Within 6 ft	1	2	1
	of Furnace
Back	Service Clearance	0	1	0
	Furnace Casing or Plenum	2	2	2
Top
	Horizontal Warm-Air Duct Within 6 ft of	2	2	3
	Furnace
Bottom		0	0*	0*
Flue	Horizontally or Below Pipe	4	4	4
Pipe	Vertically Above Pipe	9	9	9
Front		8	8	24

* Use approved subbase for combustible floor.

NOTE: Adequate service clearances should be provided over and above these dimensions as required.

The air handling capacity of this furnace is designed for cooling airflow. Refer to Table 12 for expected airflows at various external duct static pressures.

LOCATION

Step 1—General

This furnace is not water tight and is not designed for outdoor installation. This furnace shall be installed in such a manner as to protect electrical components from water. Outdoor installation would lead to a hazardous electrical condition and to premature furnace failure.

Do not use this furnace as a construction heater. Use of this furnace as a construction heater exposes furnace to abnormal conditions, contaminated combustion air, and lack of air filters. Failure to follow this warning can lead to premature furnace failure and/or vent failure which could result in a fire hazard and/or bodily harm.

For attic installation, it is important to keep insulation 12 in. or more away from any furnace openings. Some types of insulating materials may be combustibles and may cause a fire hazard and property damage.

This furnace is approved for reduced clearances to combustible construction, therefore, it may be installed in a closet or similar enclosure. Since this unit may be installed in an upflow, counter- flow, or horizontal position, it may be located in a basement or on the same level as area to be heated. In any case, unit should always be installed level.

In a basement, or when installed on floor (as in a crawlspace), it is recommended that unit be installed on a concrete pad that is 1 in. to 2 in. thick.

When installed in counterflow position, furnace must not be installed on combustible flooring, unless approved subbase is used. Also, since flue pipe is in a counterflow position, Downflow Conversion/Vent Guard Kit MUST be used. (Also, read page 9.)

When installed in a horizontal position, furnace may be suspended by using an angle iron frame, as long as total weight of both furnace and frame are allowed for in support calculations. (Other methods of suspending are acceptable.) When installed in the Horizontal Position, this furnace must not be installed on combus- tible flooring, unless the approved Horizontal Subbase is used.

The required minimum clearances for furnace are specified in Table 1.

The furnace should be located as close as possible to chimney or vent in order to keep vent connections short and direct. The furnace should also be located as near as possible to center of air distribution system.

Step 2—Location Relative to Cooling Equipment

When installing furnace with cooling equipment for year-round operation, the following recommendations must be followed for series or parallel airflow:

1.In series airflow applications, coil is mounted after furnace in an enclosure in supply-air stream. The furnace blower is used for both heating and cooling airflow.

The coil MUST be installed on air discharge side of furnace. Under no circumstances should airflow be such that cooled, conditioned air can pass over furnace heat exchanger. This will cause condensation in heat exchanger and possible failure of heat exchanger which could lead to a fire hazard and/or a hazardous condition which may lead to bodily harm. Heat exchanger failure due to improper installation may not be covered by warranty.

2.In parallel airflow applications, dampers must be provided to direct air over furnace heat exchanger when heat is desired and over cooling coil when cooling is desired.

IMPORTANT: The dampers should be adequate to prevent cooled air from entering furnace. If manually operated, dampers must be equipped with a means to prevent operation of either cooling unit or furnace unless damper is in full cool or heat position.

INSTALLATION

Step 1—Air for Combustion and Ventilation

Installation of this furnace in an area where it will receive contaminated combustion air must be avoided. Such contami- nation would include the following: ammonia, chlorine, hydrogen sulfide, halogenated hydrocarbons, carbon tetra- chloride, cleaning solvents, hydrochloric acid, water soften- ing chemicals, and similar chemicals. Failure to follow this warning will lead to premature rusting of heat exchanger and possible premature furnace failure and/or vent failure which could result in fire hazard and/or bodily harm.

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