Carrier 50JS ÐProvide Unit Support, ÐProvide Clearances, ÐRig and Place Unit, Installation

INSPECT SHIPMENT Ð Inspect for shipping damage while unit is still on shipping pallet. If unit appears to be damaged or is torn loose from its anchorage, have it examined by transportation inspectors before removal. Forward claim papers directly to transportation company. Manufacturer is not responsible for any damage incurred in transit. Check all items against shipping list. Immediately notify the nearest Carrier Air Conditioning office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.

Step 2ÐProvide Unit Support

ROOF CURB Ð Install accessory roof curb in accordance with instructions shipped with curb (See Fig. 4). Install insulation, cant strips, roofing, and flashing. Ductwork must be attached to curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasketing material supplied with the roof curb. Improperly applied gasketing also can result in air leaks and poor unit performance.

Curb should be level to within 1/4 in. (See Fig. 5). This is necessary for unit drain to function properly. Refer to accessory roof curb installation instructions for additional information as required.

A C

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

B		B-C	A-C
	A-B
1/4		1/4	1/4

C99065

Fig. 5ÐUnit Leveling Tolerances

SLAB MOUNT Ð Place the unit on a solid, level concrete pad that is a minimum of 4 in. thick with 2 in. above grade (See Fig. 6). The slab should extend approximately 2 in. beyond the casing on all 4 sides of the unit. Do not secure the unit to the slab except when required by local codes.

OPTIONAL	OPTIONAL
RETURN	SUPPLY
AIR	AIR
OPENING	OPENING

2"

EVAP. COIL COND. COIL

C99096

Fig. 6ÐSlab Mounting Detail

GROUND MOUNT Ð The unit may be installed either on a slab or placed directly on the ground if local codes permit. Place the unit on level ground prepared with gravel for condensate dis- charge.

Step 3ÐProvide Clearances

The required minimum service clearances are shown in Figs. 2 and

3.Adequate ventilation and outdoor air must be provided. The outdoor fan draws air through the outdoor coil and discharges it through the top fan grill. Be sure that the fan discharge does not recirculate to the outdoor coil. Do not locate the unit in either a

corner or under an overhead obstruction. The minimum clearance under a partial overhang (such as a normal house overhang) is 36 in. above the unit top. The maximum horizontal extension of a partial over-hang must not exceed 36 in. For extended overhangs, provide a minimum clearance of 36 in.

IMPORTANT: Do not restrict outdoor airflow. An air restriction at either the outdoor-air inlet or the fan discharge may be detrimental to compressor life.

Do not place the unit where water, ice, or snow from an overhang or roof will damage or flood the unit. Do not install the unit on carpeting, tile, or other combustible materials. Slab-mounted units should be at least 4 in. above the highest expected water and runoff levels. Do not use unit if it has been under water.

Step 4ÐRig and Place Unit

Rigging and handling of this equipment can be hazardous for many reasons due to the installation location (roofs, elevated structures, etc.)

Only trained, qualified crane operators and ground support staff should handle and install this equipment.

When working with this equipment, observe precautions in the literature, on tags, stickers and labels attached to the equipment, and any other safety precautions that might apply.

Follow all applicable safety codes. Wear safety shoes and work gloves.

INSPECTION Ð Prior to initial use, and at monthly intervals, all rigging brackets and straps should be visually inspected for any damage, evidence of wear, structural deformation, or cracks. Particular attention should be paid to excessive wear at hoist hooking points and load support areas. Brackets or straps showing any kind of wear in these areas must not be used and should be discarded.

INSTALLATION

1.Remove unit from shipping carton. Leave top shipping skid on the unit as a spreader bar to prevent the rigging straps from damaging the unit. If the wood skid is not available, use a spreader bar of sufficient length to protect unit from damage.

2.Position the lifting bracket assembly around the base of the unit. Be sure the strap does not twist.

3.Place each of the 4 metal lifting brackets into the handholds in the composite pan.

4.Thread lifting bracket strapping around bottom perimeter of unit as follows:

a.Open lever of tension buckle (ratchet type).

b.Feed strapping through tension buckle as shown in Fig. 7.

c.Pull strapping through tension buckle unit taut.

d.Snap lever down to lock strap in tension buckle. To release strapping, squeeze safety latch, lift lever, and pull webbing outward.

HANDHOLD

HOOK

FEED

C99067

Fig. 7ÐThreading Belt

5