Carrier 50SZ024 Installation Instructions Manual

£n
to the Expertg
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner's Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS ........................ 1
INTRODUCTION .................................. 2
RECEIVING AND INSTALLATION ................ 2-14
Check Equipment ................................. 2
Identify Unit ................................... 2
Inspect Shipment ................................ 2
Provide Unit Support .............................. 2
Roof Curb ..................................... 2
Slab Mount .................................... 2
Ground Mount ................................. 2
Provide Clearances ................................ 2
Field Fabricate Ductwork ........................... 2
Rig and Place Unit ................................ 2
Inspection ..................................... 2
Installation ..................................... 6
Use of Rigging Bracket ........................... 6
Connect Condensate Drain .......................... 7
Select and Install Duc_vork .......................... 7
Configuring Units for Downflow (Vertical) Discharge ..... 8
Install Electrical Connections ........................ 9
High-Voltage Connections ........................ 9
Routing Power Leads Into Unit .................... 10
Connecting Ground Lead to Ground Screw .......... 10
Routing Control Power Wires (24-V) ............... 10
Special Procedures for 208-v Operation ............. 10
PRE-START-UP .................................. 10
START-UP ....................................... 11
Check for Refrigerant Leaks ........................ 11
Start-Up Adjustments ............................. 11
Checking Cooling & Heating Control Operation ....... 11
Checking and Adjusting Refrigerant Charge .......... 11
Indoor Airflow and Airflow Adjustments ............ 14
For 208/230v .................................. 14
MAINTENANCE ............................... 15-20
Air Filter ....................................... 16
Indoor Blower and Motor .......................... 16
Outdoor Coil, Indoor (;oil, and Condensate Drain Pan .... 16
Outdoor Fan .................................... 16
Electrical Controls and Wiring ...................... 21
Refrigerant Circuit ................................ 21
Indoor Airflow .................................. 21
®
Metering Devices-AccuRater Piston ................ 21
TROUBLESHOOTING ............................. 22
START-UP CHECKLIST ........................... 24
Fig. 1 - Unit 50SZ
C99001
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Installation must be in compliance with
local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
Recognize safety information. This is the safety-alert symbol _.
When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury. Understand these signal
words: DANGER, WARNING. and CAUTION. These words are
used with the safety-alert symbol. DANGER identifies the most se-
rious hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal injury
or death. CAUTION is used to identify unsafe practices which may
result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.