Carrier ROOMTOP 50AH024-096- Installation Manual

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

712 5-10

Replaces: 50AH-12SI

Installation, Start-Up, and

Service Instructions

CONTENTS

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . 1

GENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1, 2

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Step 1 — Receive and Inspect Unit

. . . . . . . . . . . . . . . 2

Step 2 — Protect Unit from Damage

. . . . . . . . . . . . . . 2

Step 3 — Provide Unit Support

. . . . . . . . . . . . . . . . . . . 2

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.

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.

WARNING

Disconnect all power to the unit before performing mainte-

nance or service. Electrical shock and personal injury could

result.

WARNING

DO NOT USE TORCH to remove any component. System

contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and gog-

gles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from sys-

tem using both high-pressure and low pressure ports.

c. Traces of vapor should be displaced with nitrogen

and the work area should be well ventilated. Refrig-

erant in contact with an open flame produces toxic

gases.

d. Cut component connection tubing with tubing cutter

and remove component from unit. Use a pan to catch

any oil that may come out of the lines and as a gage

for how much oil to add to the system.

e. Carefully unsweat remaining tubing stubs when nec-

essary. Oil can ignite when exposed to torch flame.

Failure to follow these procedures may result in personal

injury or death.

CAUTION

DO NOT re-use compressor oil or any oil that has been

exposed to the atmosphere. Dispose of oil per local codes

and regulations. DO NOT leave refrigerant system open to

air any longer than the actual time required to service the

equipment. Seal circuits being serviced and charge with

dry nitrogen to prevent oil contamination when timely

repairs cannot be completed. Failure to follow these proce-

dures may result in damage to equipment.

ROOMTOP

®

50AH024-096

Horizontal Indoor Single-Package Cooling Units

with PURON

®

Refrigerant (R-410A)



