Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 18-40VMD001-01
Printed in U.S.A.
Form 40VMD-3SI
Pg 1
3-18
Replaces: 40VMD-2SI
Installation and Maintenance Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . .1,2
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Step 1 — Unpack and Inspect Units
. . . . . . . . . . . . 4
• PROTECTING UNITS FROM DAMAGE
• PREPARING JOBSITE FOR UNIT INSTALLATION
• IDENTIFYING AND PREPARING UNITS
Step 2 — Position the Unit
. . . . . . . . . . . . . . . . . . . . 4
Step 3 — Mount the Unit
. . . . . . . . . . . . . . . . . . . . . . 4
• INSTALLING HANGER BOLTS
• MOUNTING UNIT
Step 4 — Connect Piping
. . . . . . . . . . . . . . . . . . . . . . 5
• CONDENSATE PIPING
• REFRIGERANT PIPING
• PIPING BETWEEN MDC AND INDOOR UNIT
• TWINNING MDC PORTS
• PIPING BETWEEN MDC AND SUB MDC
• PIPING BETWEEN MDC AND OUTDOOR UNIT
ELECTRICAL REQUIREMENTS
. . . . . . . . . . . . 14-17
Opening the Electrical Control Box
. . . . . . . . . . . . 14
Complete Electrical Connections
. . . . . . . . . . . . . 15
MDC UNIT ADDRESSING
. . . . . . . . . . . . . . . . . . . 18
Setting the Unit Address
. . . . . . . . . . . . . . . . . . . . 18
Merged Port Setting
. . . . . . . . . . . . . . . . . . . . . . . . 18
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . 18, 18
LED Indication Lamp Instructions
. . . . . . . . . . . . 18
Error Code
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SW8/SW9 Query Instruction
. . . . . . . . . . . . . . . . . 19
TEST RUN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
APPENDIX A — DIP SWITCH SETTINGS
. . . . . . . . 20
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.
For 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 could 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 for the potential of personal
injury. Installing, starting up, and servicing the 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.
WARNING
When installing the equipment in a small space, provide
adequate measures to avoid refrigerant concentration
exceeding safety limits due to refrigerant leak. In case of
refrigerant leak during installation, ventilate the space
immediately. Failure to follow this procedure may lead to
personal injury.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and
goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from
system using both high-pressure and low pressure
ports.
c. Traces of vapor should be displaced with nitrogen
and the work area should be well ventilated.
Refrigerant in contact with an open flame produces
toxic gases.
d. Cut component connection tubing with tubing cutter
and remove component from unit. Use a pan to catch
any oil that may come out of the lines and as a gage
for how much oil to add to the system.
e. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Failure to follow these procedures may result in personal
injury or death.
40VMD006-016
Multiport Distribution Controller for
Variable Refrigerant Flow (VRF) Systems
