Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 18-38VMH001-01
Printed in U.S.A.
Form 38VMH-3SI
Pg 1
10-18
Replaces: 38VMH-1SI
Installation and Maintenance Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . 1
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Step 1 — Unpack and Inspect Units
. . . . . . . . . . . . 9
• PROTECTING UNITS FROM DAMAGE
• PREPARING JOBSITE FOR UNIT INSTALLATION
• IDENTIFYING AND PREPARING UNITS
Step 2 — Position the Unit
. . . . . . . . . . . . . . . . . . . 10
• HANDLING THE UNIT
• CONCRETE BASE REQUIREMENTS
• OUTDOOR UNIT PLACEMENT
• SPACE REQUIRED FOR INSTALLATION AND
MAINTENANCE
• SNOW GUARD INSTALLATION
• ACCESSING REFRIGERANT AND ELECTRICAL
CONNECTIONS
Step 3 — Connect Refrigerant Piping
. . . . . . . . . . 12
• REFRIGERANT PIPING CONNECTIONS
• REFRIGERATION PIPING MEASUREMENTS
• CONNECTING THE OUTDOOR UNITS
Step 4 — Pressure and Vacuum Test System
. . 19
Step 5 — Adjust Refrigerant Charge
. . . . . . . . . . . . 19
Step 6 — Complete Electrical Connections
. . . . . . . 19
• POWER SUPPLY
• OPENING AND CLOSING THE ELECTRICAL
COMPONENT BOX
• POWER WIRING
• WIRING THE COMMUNICATION TERMINAL
BLOCK
• COMMUNICATION CABLE
• COMMUNICATION WIRING
• OPTION/EXTENSIONS OF COMMUNICATION
WIRING
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23, 24
Trial Run
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Unit Settings
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Advanced Settings
. . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Snow-Blowing Functions
. . . . . . . . . . . . . . . . . . . . . . 25
Pre-Start Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
MAINTENANCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock,
or other conditions; which may cause death, personal injury or
property damage. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this
product.
Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local
building codes and the current editions of the National
Electrical Code (NEC) ANSI/NFPA (American National
Standards Institute/National Fire Protection Association) 70. In
Canada, refer to the current editions of the Canadian Electrical
Code CSA (Canadian Standards Association) C22.1.
Understand the signal words — DANGER, WARNING,
and CAUTION. DANGER identifies the most serious hazards,
which will result in severe personal injury or death.
WARNING signifies hazards that could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which would result in minor personal injury or product and
property damage.
Recognize safety information. This is the safety-alert
symbol (
). When this symbol is displayed on the unit and in
instructions or manuals, be alert to the potential for personal
injury. Installing, starting up, and servicing equipment can be
hazardous due to system pressure, electrical components, and
equipment location.
WARNING
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all
disconnect locations to alert others not to restore power
until work is completed.
38VMH072-432
Outdoor Unit for
Variable Refrigerant Flow (VRF) Heat Pump Systems
