Introduction; Receiving And Installation; Check Equipment; Identify Unit - Carrier 50JZ024 Installation, Start-Up And Service Instructions Manual

Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory heater
power switch if applicable. Electrical shock could cause
severe injury or death.
Puron (R-410A) systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on Puron (R-410A) equipment. Ensure service
equipment is rated for Puron (R-410A).

INTRODUCTION

The 50JZ heat pump is fully self-contained and designed for
outdoor installation (See Fig. 1). Standard units are shipped in a
horizontal-discharge configuration for installation on a ground-
level slab. Standard units can be converted to downflow (vertical)
discharge configurations for rooftop applications.

RECEIVING AND INSTALLATION

Step 1—Check Equipment
IDENTIFY UNIT — The unit model number and serial number
are stamped on the unit identification plate. Check this information
against shipping papers.
INSPECT SHIPMENT — 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 2—Provide Unit Support
ROOF CURB — 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. (Fig. 5). This is necessary for
unit drain to function properly. Refer to accessory roof curb
installation instructions for additional information as required.
SLAB MOUNT — Place the unit on a solid, level concrete pad
that is a min of 4 in. thick with 2 in. above grade (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.
GROUND MOUNT — 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 3—Provide Clearances
The required minimum service clearances are shown in Fig. 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 48
in. above the unit top. The maximum horizontal extension of a
partial over-hang must not exceed 48 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 4—Rig 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 — 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.
5. Tighten the tension buckle until it is taut. Lifting brackets
must be secure in the handholds.
6. Attach field-supplied clevis or hook of sufficient strength to
hole in the lifting bracket (See Fig. 8).
7. Attach the 2 safety straps directly to the clevis or hook at the
4 rigging brackets. DO NOT attach the safety straps to the
lifting brackets (See Fig. 8).
8. Position lifting point directly over the unit's center of gravity.
9. Lift unit. When unit is directly over the roof curb, remove the
2 safety straps. Lower the equipment onto the roof curb.
10. After the unit is placed on the roofcurb or mounting pad,
remove the top crating. On 50JZ060 units only, 2 wire ties
fastened to the outdoor coils and reversing valve/accumulator
assembly must be cut. Remove the left and front louver panels
and corner post to access the wire ties. The wire tie to be cut
on the left is located approximately 4 in. down the tube sheet
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