IMPORTANT — READ BEFORE INSTALLING
1. Read and become familiar with these installation
instructions before installing this unit (see Fig. 1 for typi-
cal multi-split system components).
2. Be sure the installation conforms to all applicable local
and national codes.
3. These instructions contain important information for the
proper maintenance and repair of this equipment. Re-
tain these instructions for future use.
CONTENTS
Page
SAFETY CONSIDERATIONS ........................2
GENERAL .......................................2
I. System Description .........................2
II. Planning the System ........................2
INSTALLATION .................................2-13
I. Complete Pre-Installation Checks .............2
II. Install Outdoor Unit .........................4
III. Install Fan Coil Units ........................4
IV. Complete Refrigerant Piping ..................7
V. Make Electrical Connections .................8
START-UP ....................................13,14
I. Leak Test .................................13
II. Evacuate and Dehydrate ....................13
III. Charge System ............................13
IV. Preliminary Checks ........................13
V. Operating Sequence .......................13
SERVICE .....................................15-17
I. Outdoor Fan ..............................15
II. Scroll Compressors ........................15
III. High-Pressure Relief Valve ..................15
IV. Internal Current and Temperature Sensitive
Overload .................................15
V. High-Pressure Switch ......................15
VI. Low-Pressure Switch .......................15
VII. Service Valves ............................15
VIII. Refrigerant Charging .......................16
IX. Compressor Lockout Switch (CLO) ...........16
X. Outdoor-Coil Temperature Thermistor
(OCH TH) .................................17
XI. Low-Ambient Control Thermistor (LAT) .......17
XII. Pressure Transducer .......................17
MAINTENANCE .................................17
I. Lubrication ...............................17
II. Cleaning Coils ............................17
TROUBLESHOOTING ...........................17,18
I. Checking Cooling Control Operation ..........17
START-UP CHECKLIST ...................CL-1 to CL-4
538S (048 Shown)
619C
619B
619F
Fig. 1 — Multi-Split System Components
installation, start-up and
service instructions
MULTI-SPLIT, DUCT-FREE
OUTDOOR COOLING UNITS
538S
Sizes 024,048
2 and 4 Tons
Cancels: New II 538S-24-1
2/15/96
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