Carrier 50AH024-096 specifications Installation, Start-Up, Service Instructions

ROOMTOP® 50AH024-096 Horizontal Indoor Single-Package Cooling Units

with PURON® Refrigerant (R-410A)

Installation, Start-Up, and

Service Instructions

CONTENTS

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 Step 1 — Receive and Inspect Unit . . . . . . . . . . . . . . . 1 Step 2 — Protect Unit from Damage . . . . . . . . . . . . . . 1 Step 3 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1 Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 8

Step 5 — Make Condensate Piping Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Step 6 — Install Ductwork . . . . . . . . . . . . . . . . . . . . . . . . 8

Step 7 — Split Systems (Factory Option,

if Required). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Step 8 — Make Electrical Connections . . . . . . . . . . 10

•FIELD CONTROL WIRING

•THERMOSTAT WIRE

Step 9 — Adjust Fan Speed . . . . . . . . . . . . . . . . . . . . . 10 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17,18

SAFETY CONSIDERATIONS

Installing and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func- tions such as cleaning coils and filters and replacing filters. All other operations should be performed by trained service per- sonnel. When working on air-conditioning equipment, observe precautions in the literature and on tags and labels attached to unit.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available.

WARNING

Disconnect all power to the unit before performing mainte- nance or service. Electrical shock and personal injury could result.

NOTE: Ensure voltage on unit agrees with voltage listed on the unit rating plate.

GENERAL

The 50AH024-096 units are single-package, indoor, hori- zontally mounted air conditioners of 2 to 8 tons capacity. The 50AH units are ASHRAE (American Society of Heating, Re- frigerating and Air Conditioning Engineers) 90.1 compliant.

These units can be mounted as factory-shipped single- package units or can be separated and mounted as a split

system. If unit is split, the condensing section must be mounted horizontally.

All units are designed to be ducted on both the condenser and evaporator sides. Centrifugal blowers are used to ensure quiet air delivery to the conditioned space. Sound level requirements should be determined before final unit installa- tion site is chosen.

Unit servicing is relatively simple since access to the con- denser and evaporator motors, blowers, belt, and pulley is gained through access panels located on the sides of the unit. These panels may also be used for cleaning of condenser coils. Unit side panels also provide access to control box and pres- sure switches.

Refrigeration cycle components (e.g., compressor, filter drier, etc.) can be serviced upon removal of the base unit from the space.

INSTALLATION

WARNING

Determine building alterations required to run piping, wir- ing, and ductwork. Follow dimensional drawings carefully for ductwork, piping locations, electrical wiring, and over- all unit dimensions. Read all installation instructions before starting installation.

The 50AH units are intended for indoor installation only.

Step 1 — Receive and Inspect Unit — Unpack and check unit against shipping order. See Fig. 1 for model number nomenclature. Inspect carefully for concealed shipping dam- age. If unit is damaged or incomplete, file claim with transpor- tation company and advise Carrier immediately.

Step 2 — Protect Unit from Damage — To main- tain warranty, unit must be protected against theft and vandal- ism and stored indoors at all times.

Step 3 — Provide Unit Support — Refer to Fig. 2-5 for unit dimensions. Refer to Table 1 for unit sizes and weights.

Each unit requires the following field-supplied items:

8 — threaded suspension rods (3/8-in.-16 SAE Grade 1 minimum), 4 additional rods are needed if the unit has a factory-installed air-side economizer

8 — washers

8 — locknuts

Install the 8 field-supplied rods by suspending them from a suitable ceiling support. Locate rods to mate with 8 outside cor- ner rigging holes shown in Fig. 2-5. Unit center of gravity is shown in Fig. 6.

The ceiling and ceiling supports of existing buildings may require reinforcements; follow all applicable codes.

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

Catalog No. 04-53500057-01 Printed in U.S.A. Form 50AH-14SI Pg 1 5-10 Replaces: 50AH-12SI