Carrier ROOMTOP 50AH024-096 - 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)
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