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

HEATING & COOLING
5QAH024-060
Single-Package Cooling Units
Installation, Start-Up and Service Instructions
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can
be hazardous due to system pressure and electrical compo¬
nents. 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
personnel. 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.
A
WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock can cause personal injury.
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.
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 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 en¬
sure quiet air delivery to the conditioned space. Sound level
requirements should be determined before final unit instal¬
lation 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 con¬
denser coils. Unit side panels provide access to control box
and pressure switches.
Refrigeration cycle components (e.g., compressor, filter
drier, etc.) can be serviced upon removal of the base unit
from the space.
INSTALLATION
The 50AH units are intended for indoor installation only.
Step 1 — Receive and Inspect Unit
— Unpack
and check unit against shipping order. Inspect carefully for
concealed shipping damage. If unit is damaged or incom¬
plete, file claim with transportation company and advise
Carrier immediately.
Step 2 — Protect Unit from Damage
— To main¬
tain warranty, unit must be protected against theft and van¬
dalism and stored indoors at all times.
Step 3 — Provide Unit Support
— Refer to
Fig. 1-2B 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 (3/s-in. - 16 SAE Grade 1
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 out¬
side corner rigging holes shown in Fig. 1 and 3.
The ceiling and ceiling supports of existing buildings may
require reinforcements; follow all applicable codes.
Step 4 — Rig and Place Unit
— Move and store
unit in horizontal position. Provide space around unit for
service, filter access, ductwork, and overhead clearance as
indicated in Fig. 1.
Using suitable hydraulic lift source, raise unit up to meet
bottom of the 4 threaded rods suspended from ceiling. Cen¬
ter unit so that the 4 threaded rods can be easily inserted
into the factory-drilled holes at each end. Refer to Fig. 3
for rigging details.
Apply washers and locknuts on ends of each of the
4 rods.
Tighten locknuts sufficiently so that unit weight is sup¬
ported entirely by the 4 rods. Level unit within the space by
adjusting locknuts.
IMPORTANT: Unit must be level to operate
properly.
NOTE: The 2 factory-drilled holes in the middle of unit can
be used for support if a split system application is desired.
If required, an accessory vibration isolator package is avail¬
able for use to minimize vibration that may be transmitted
to building structure.
Step 5 — Make Piping Connections
— Two 3A-
in. pipe thread condensate drain connections are provided
below the evaporator coil. One 3/4-in. pipe thread connec¬
tion is provided for condenser coil washdown. One of the
evaporator drains is plugged at the factory; plug must be
removed when making field connections. The condenser wash¬
down pan is plugged at the factory. This drain is to be used
only when condenser coil is being cleaned; plug must be
replaced when cleaning is completed.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 2b 7b
PC 111 Catalog No. 565-162 Printed in U S A
Form 50AH-7SI
Pg 1
1-93 Replaces: 50AH-6SI