Carrier 50LJ008 Installation, Start-Up And Service Instructions Manual

50LJ008-014
Single-Package Rooftop Cooling Units
HEATING & COOLING
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . 1
INSTALLATION .
1-14
Step 1 - Provide Unit Support. 2
• ROOF CURB
• SLAB MOUNT
Step 2 - Field Fabricate Ductwork . 2
Step 3 - Install External Trap for
Condensate Drain. 2
Step 4 - Rig and Place Unit. 2
• POSITIONING
Step 5 - Make Electrical Connections . 2
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 6 - Adjust Evaporator-Fan Speed ... .9
START-UP.
15,16
SERVICE .
16-18
SAFETY CONSIDERATIONS
Installation 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 of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per¬
sonnel. When working on air conditioning equipment, ob¬
serve precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
A
WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
INSTALLATION
Unit is shipped in the vertical discharge configuration.
To convert to horizontal discharge application, cut imprint
area from front panels using sheet metal cutters. See Fig. 1
Duct openings in basepan must be covered by panels pro¬
vided in the Accessory Duct Cover Package, part no.
50LJ900214 (50LJ008,009) or 50LJ900217 (50LJ012,014).
Using screws provided in accessory package, install cov¬
ers on duct openings in basepan of unit with insulation-side
down. Seals around opening must be tight.
IMPORTANT: An external filter kit MUST be used
or the filters MUST be field-installed outside the unit
on horizontal applications with accessory economizer
or two-position damper. Otherwise, the economizer
or two-position damper must be partially removed to
access the filters. The area of the field-installed fil¬
ters should be equal to the area of the factory-
installed filters.
Fig. 1 - Horizontal Conversion Imprint Dimensions
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Book 1 4
Tab 1b 6b
PC 111
Catalog No 565-004
Printed in U S A
Form 50LJ-4SI
Pg1
11-91 Replaces: 50LJ-2SI