Carrier 48HE003---006, 48HJ004---007 Property Damage Hazard, Positioning, Install Flue Hood

Lifting holes are provided in base rails as shown in Fig. 8 and 9. Refer to rigging instructions on unit.

!WARNING

PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in personal injury, death and property damage.

All panels must be in place when rigging and lifting.

	positioning
	Maintain clearance around and above unit to provide minimum
	distance from combustible materials, proper airflow, and service
	access. (See Fig. 7, 8 and 9.)
	Position unit on roof curb so that the following clearances are
	maintained:	1/ in. clearance between the roof curb and the base
48HE,HJ		4
	rail inside the front and rear, 0.0 in. clearance between the roof
	curb and the base rail inside on the duct end of the unit. This will
	result in the distance between the roof curb and the base rail
	inside on the condenser end of the unit being approximately
	equal to Fig. 2, section C-C.
	Do not install unit in an indoor location. Do not locate unit air
	inlets near exhaust vents or other sources of contaminated air.

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B	B-C	A-C
0.5	1.0	1.0

C06110

Fig. 3 ---Unit Leveling Tolerances

Be sure that unit is installed such that snow will not block the combustion intake or flue outlet.

Unit may be installed directly on wood flooring or on Class A, B, or C roof-covering material when roof curb is used.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

Locate mechanical draft system flue assembly at least 48 in. from an adjacent building or combustible material. When unit is located adjacent to public walkways, flue assembly must be at least 7 ft above grade.

NOTE: When unit is equipped with an accessory flue discharge deflector, allowable clearance is 18 inches.

Flue gas can deteriorate building materials. Orient unit such that flue gas will not affect building materials.

Adequate combustion-air space must be provided for proper operation of this equipment. Be sure that installation complies with all local codes and Section 5.3, Air for Combustion and Ventilation, NFGC (National Fuel Gas Code), ANSI (American National Standards Institute) Z223.1-1984 and addendum Z223.1a-1987. In Canada, installation must be in accordance with the CAN1.B149.1 and CAN1.B149.2 installation codes for gas burning appliances.

Flue vent discharge must have a minimum horizontal clearance of 4 ft from electric and gas meters, gas regulators, and gas relief equipment.

After unit is in position, remove shipping materials and rigging skids.

Step 5 —Install Flue Hood

Flue hood is shipped screwed to the burner compartment access panel. Remove from shipping location and, using screws provided, install flue hood in location shown in Fig. 8 and 9.

For units being installed in California Air Quality Management Districts which require NOx emissions of 40 nanograms/joule or less, a low NOx unit must be installed.

NOTE: Low NOx units are available for 3 to 5 ton units.

CONDENSATE PAN (SIDE VIEW)

HORIZONTAL	DRAIN PLUG
DRAIN OUTLET

NOTE: Drain plug is shown in factory-installed position.

C06003

Fig. 4 ---Condensate Drain Pan

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4-in. trap is recommended.

C06004

Fig. 5 ---Condensate Drain Piping Details

Step 6 —Install Gas Piping

Unit is equipped for use with type of gas shown on nameplate. Refer to local building codes, or in the absence of local codes, to ANSI Z223.1-1984 and addendum Z223.1A-1987 entitled National Fuel Gas Code. In Canada, installation must be in accordance with the CAN1.B149.1 and CAN1.B149.2 installation codes for gas burning appliances.

For natural gas applications, gas pressure at unit gas connection must not be less than 4 in. wg or greater than 13 in. wg while the unit is operating. On 48HJ005-007 high-heat units, the gas pressure at unit gas connection must not be less than 5 in. wg or greater than 13 in. wg while the unit is operating. For propane applications, the gas pressure must not be less than 5 in. wg or greater than 13 in. wg at the unit connection.

Size gas supply piping for 0.5 in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection.

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