Instructions / Assembly

Page 45 mrcool.com
Multi-Zone System Wiring Information & Diagrams
NOTE: ELECTRICAL WORK MUST BE COMPLETED BY A QUALIFIED TECHNICIAN!
Connect the connective cables to the terminals, as identified with diagrams and illustrations on
the following pages, with their matching numbers on the terminal block of the indoor and
outdoor units. Ensure that all screws and wires are securely fastened to the terminal block. For
example, in the US models shown in the Fig. on the following page, Terminal L1(A) of the outdoor
unit must connect with terminal 1 on the indoor unit. Continue to match zone to zone for any
additional connections.
See wiring diagrams on the following pages for each type of multi-zone system
(Fig. 8.4 - 8.7 on the following page) and take note of the following precautions:
• Always have an individual power circuit specifically for the air conditioner.
• Always follow the circuit diagram posted on the inside of the control cover.
• Check the specifications for the power source before proceeding.
• Confirm the starting voltage is maintained at more than 90 percent of the rated voltage listed
on the name plate.
• Confirm that the electrical capacity is sufficient.
• Confirm that the cable thickness is as specified in the power source specifications.
• Always install an earth leakage circuit breaker in wet or moist areas.
• The following can be caused by a drop in voltage; vibration of a magnetic switch, damaging the
contact point, broken fuses, and disturbance of normal functioning.
• Disconnection from a power supply must be incorporated into the fixed wiring. It must have an
air gap contact separation of at least 1/8 in (3 mm) in each active (phase) conductors.
• Before accessing terminals, all supply circuits must be disconnected.
• If using magnetic rings (optional - not supplied), you must use the correct magnetic rings on
your equipment to satisfy the EMC compulsory regulations required by the international
standard CISPR 14-1:2005/A2:2011. Please make sure to apply the correct magnetic rings on the
equipment according to the wiring diagrams. Please contact your distributor or installer for
further information.
CAUTION
Multi-Zone System Wiring Information
If the ceiling cassette is being installed as part of a multi-zone system, please read the information below
and refer to the wiring diagrams on the following pages before proceeding to the next step in the installation.
NOTE: The outside unit’s terminal block is protected by an electrical wiring cover on the side of the
unit. A comprehensive wiring diagram is printed on the inside of the wiring cover.
SELECT THE CORRECT POWER CABLE
•
See table below for gauge requirements
NOTE: The table below is a standard chart,
the AWG ratings and wiring needs will change
based on wire length and temperature.
Appliance
Amps (A)
AWG
25
18K
Capacity
of Outdoor
Unit
Minimum Wire Gauge for Power Cables
MCA MOP Min. Pref.
12 10
40 10 8
60 8 6
18
27K 26
45 10 836K 27
48K 40
DO NOT MIX UP LIVE AND NULL WIRES.
• This is dangerous and could cause the unit
to malfunction. Make sure you clearly
distinguish the live (”L”) wires from the
other wires.
• All wiring must be performed in accordance
with the wiring diagrams shown in Figs. 8.4 -
8.7 and demonstrated in the images shown
here.