Carrier 50AH024 Installation, Start-Up And Service Instructions Manual

CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
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 . . . . . . . . . . . . . . . . . . . . . 4
Step 5 - Make Piping Connections . . . . . . . . . . . . . . 4
Step 6 - Install Ductwork . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 7 - Make Electrical Connections . . . . . . . . . . . 4
Splitting Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Field Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermostat Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Step 8 - Adjust Fan Speed . . . . . . . . . . . . . . . . . . . . . . 5
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6,7
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7,8
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.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
can cause personal injury.
NOTE: Ensure voltage on unit agrees with voltage listed on
the unit rating plate.
GENERAL
The 50AH024,036,048, and 060 units are single-package,
indoor, horizontally mounted air conditioners of 2, 3, 4 and
5 tons capacity, respectively. The 50AH units are ASHRAE
(American Society of Heating, Refrigeration and Air Condi-
tioning Engineers) 90.1 compliant.
These units can be mounted as factory-shipped single-
package units or can be separated and mounted as a split
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Book 1 4
Tab 2b 7a
Single-Package Cooling Units
Installation, Start-Up, and
Service Instructions
Catalog No. 535-00076 Printed in U.S.A.
50AH024-060
system. If unit is split, the condenser section can 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 removable swing doors located on bottom of
unit. These doors may also be used for cleaning of condenser
coils. Unit side panels 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
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 -
check unit against shipping order. Inspect carefully for
concealed shipping damage. If unit is damaged or incomplete,
file claim with transportation company and advise Carrier
immediately.
Step 2 - Protect Unit from Damage -
tain warranty, unit must be protected against theft and vandal-
ism and stored indoors at all times.
Step 3 - Provide Unit Support -
and 2 for unit dimensions and component locations. Refer to
Table 1 for unit sizes and weights.
Each unit requires the following field-supplied items:
4 - threaded suspension rods (
minimum)
4 - washers
4 - locknuts
Install the 4 field-supplied rods by suspending them from a
suitable ceiling support. Locate rods to mate with 4 outside cor-
ner rigging holes shown in Fig. 1 and 3.
The ceiling and ceiling supports of existing buildings may
require reinforcements; follow all applicable codes.
Form 50AH-12SI Pg 1
Unpack and
To main-
Refer to Fig. 1
3
/ -in.-16 SAE Grade 1
8
8-02 Replaces: 50AH-9SI