Carrier 50ZH Instruction Manual download pdf (Page 2)

Follow all safety codes. Wear safety glasses and work gloves. Use

quenching cloth for unbrazing operations. Have fire extinguisher

available for all brazing operations.

Before performing service or maintenance operations on

system, turn off main power to unit and install lockout tag.

Turn off accessory heater power switch if applicable. Elec-

trical shock can cause serious injury or death.

Recognize safety information. This is the safety-alert symbol .

When you see this symbol in instructions or manuals, be alert to

the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION,

and NOTE. These words are used with the safety-alert symbol.

DANGER identifies the most serious hazards which will result in

severe personal injury or death. WARNING signifies a hazard

which could result in personal injury or death. CAUTION is used

to identify unsafe practices which would 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.

These instructions cover 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.

INTRODUCTION

50ZH heat pump units are fully self-contained and designed for

outdoor installation (See Fig. 1). As shown in Fig. 2-4, units are

shipped in a horizontal-discharge configuration for installation on

a ground-level slab. All units can be field-converted to downflow

discharge configurations for rooftop applications with a field-

supplied plenum.

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 pa-

pers. Verify that unit voltage and amperage listed on unit rating

plate agree with power supplied for equipment.

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 securing

points, 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

SLAB MOUNT

Place the unit on a rigid, level surface, suitable to support the unit

weight. A concrete pad or a suitable fiberglass mounting pad is

recommended. The flat surface should extend approximately 2-in.

beyond the unit casing on the 2 sides. The duct connection side and

condensate drain connection sides should be flush with the edge of

the flat surface.

A 6-in. wide gravel apron should be used around the flat surface to

prevent airflow blockage by grass or shrubs. Do not secure the unit

to the flat surface except where required by local codes.

The unit should be level to within 1/4 inch. This is necessary for

the unit drain to function properly.

GROUND MOUNT

The unit may also be installed directly on the ground if local codes

permit. Place unit on level ground prepared with gravel for

condensate discharge.

Step 3—Provide Clearances

The required minimum service clearances and clearances to

combustibles are shown in Fig. 2-4. Adequate ventilation and

outdoor coil air must be provided.

The outdoor fan pulls air through the outdoor coil and discharges

it through the fan on the top cover. 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 overhang must not exceed 48 inches.

Do not place the unit where water, ice, or snow from an overhang

or roof will damage or flood the unit. The unit may be installed on

wood flooring or on Class A, B, or C roof covering materials.

Do not restrict outdoor coil airflow. An air restriction at either

the outdoor-air inlet or the fan discharge can be harmful to

compressor life.

Step 4—Place Unit

Unit can be moved with the rigging holds provided in the unit base.

Refer to Table 1 for operating weights. Use extreme caution to

prevent damage when moving the unit. Unit must remain in an

upright position during all moving operations. The unit must be

level with in 1/4” for proper condensate drainage; the ground-level

pad must be level before setting the unit in place. When a

field-fabricated support is used, be sure that the support is level

and that it properly supports the unit.

Step 5—Select and Install Ductwork

The design and installation of the duct system must be in

accordance with:

• the standards of the NFPA (National Fire Protection Associa-

tion) for installation of nonresidence-type air conditioning and

ventilating systems

• NFPA90A or residence-type, NFPA90B; and/or local codes

and residence-type, NFPA 90B

• and/or local codes and ordinances

Select and size ductwork, supply-air registers and return-air grilles

according to ASHRAE (American Society of Heating, Refrigera-

tion, and Air Conditioning Engineers) recommendations.

Use the duct flanges provided on the supply- and return-air

openings on the side of the unit. See Fig. 2-4 for connection sizes

and locations. The 14-in. round duct collars (size 030-048 units)

are shipped inside the unit attached to the indoor blower. They are

field-installed and must be removed from the indoor cavity prior to

start-up, even if they are not used for installation.

INSTALL FLANGES FOR DUCTWORK CONNECTIONS

(50ZH060 ONLY)

The 50ZH060 units are shipped with flanges which must be

field-installed on the unit.

To install unit flanges:

1 2 3 4 5 6 7 ... 23 24

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Carrier 50ZH Instruction Manual Page 2

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