Carrier 012, 50LJQ008 installation instructions Contents, Safety Considerations, Installation

50LJQ008,012 (50 Hz)

Single-Package Rooftop Heat Pump Units

Installation, Start-Up and Service

Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Step 1 Ð Provide Unit Support . . . . . . . . . . . . . . 1

·ROOF CURB

·SLAB MOUNT

Step 2 Ð Field Fabricate Ductwork . . . . . . . . . . . 1

Step 3 Ð Make Field Connection for Condensate Disposal . . . . . . . . . . . . . . . . . . . . . . . . . 3 Step 4 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . 3 Step 5 Ð Make Electrical Connections . . . . . . . 7

·FIELD POWER SUPPLY

·FIELD CONTROL WIRING

·HEAT ANTICIPATOR SETTINGS

Step 6 Ð Adjust Indoor-Fan Speed . . . . . . . . . . . 13 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-21

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical com- ponents. Only trained and quali®ed service personnel should install, repair or service air conditioning equipment.

Untrained personnel can perform basic maintenance func- tions of cleaning coils and ®lters and replacing ®lters. All other operations should be performed by trained service per- sonnel. When working on air conditioning equipment, ob- serve precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have ®re ex- tinguisher available for all brazing operations.

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

INSTALLATION

Unit is shipped in the vertical con®guration. To convert to horizontal con®guration, remove side duct opening covers. Using the same screws, install covers on vertical duct open- ings with the insulation-side down. Seals around duct open- ings must be tight.

IMPORTANT: An external ®lter kit MUST be used, or the ®lters MUST be ®eld-installed outside the unit on horizontal applications with accessory economizer or two-position damper. Otherwise, the economizer or two-position must be partially removed to access the ®lters. The area of the ®eld-installed ®lters should be equal to the area of the factory-installed ®lters.

Step 1 Ð Provide Unit Support

ROOF CURB Ð Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 1. Install insulation, cant strips, roo®ng and counter ¯ash- ing as shown. Ductwork must be attached to curb, not to the unit. If electric or control power is to be routed through the curb, attach the accessory thru-the-curb service connection plates to the roof curb in accordance with the accessory in- stallation instructions. Connection plates must be installed before unit is set in roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket sup- plied with the roof curb as shown in Fig. 1. Improp- erly applied gasket also can result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 2. This is necessary for unit drain to function prop- erly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

SLAB MOUNT (Horizontal Units Only) Ð Provide a level concrete slab that extends a minimum of 152 mm (6 in.) be- yond unit cabinet. The slab should be 203 mm (8 in.) thick with 102 mm (4 in.) above grade. Install a gravel apron in front of outdoor coil air inlet to prevent grass and foliage from obstructing air¯ow. In areas where high snowfall occurs, increase height of slab to ensure that snow does not block coil.

NOTE: Horizontal units may be installed on a roof curb if required.

Step 2 Ð Field Fabricate Ductwork Ð On verti- cal discharge units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. For horizontal applications, ®eld-supplied ¯anges should be attached to hori- zontal discharge openings and all ductwork attached to the ¯anges. Insulate and weatherproof all external ductwork, joints and roof openings with counter ¯ashing and mastic in ac- cordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with ap- plicable ®re codes.

A minimum clearance to combustibles is not required around ductwork on vertical discharge units. On horizontal dis- charge units, a minimum clearance of 25 mm (one in.) is required for the ®rst 305 mm (12 in.) of ductwork.

Cabinet return-air static shall not exceed −87 Pa (−.35 in. wg) with economizer or −112 Pa (−.45 in. wg) with- out economizer.

Manufacturer reserves the right to discontinue, or change at any time, speci®cations or designs without notice and without incurring obligations.

Catalog No. 015-015 Printed in U.S.A. Form 50LJQ-C1SI Pg 1 1-92 Replaces: New