6 Specifications subject to change without notice. IM-KSAIC03-02
Scenario No. 3:
Multi-zone Outdoor units 38MGR with approved Ductless indoor
units High Walls, Cassettes, Ducted and Consoles. (For proper
combinations, consult the compatibility chart).
• High Wall (Sizes 9-24)
• Cassette (Sizes 9-24)
• Ducted (Sizes 9-24) (*refer to NOTE)
• Console (Sizes 9-24)
Installation Steps:
1. Run interconnecting piping from Indoor to Outdoor using Indoor
piping size.
2. Run interconnecting wiring from outdoor unit to 24V interface
using terminal connections L1, L2, S, and G.
3. Run interconnecting wiring from 24V interface to indoor unit using
terminal connections L1, L2, S and G.
4. Run thermostat wiring from thermostat to 24V interface using
connection R and C on CN15 and Y, W, G on CN19.
5. Configure the dip switches on the 24V interface accordingly.
NOTES:
One 24V interface and one thermostat is required per indoor unit
head. Follow the Indoor and Outdoor unit's general installation
instructions.
*For Ducted units, in order to initially setup the static pressure,
the 24V interface must be bridged. Temporarily connect together
the Communication wires L1, L2, S and G from indoor to outdoor
unit until static pressure settings are complete (see ducted unit
Installation Manual). When static pressure is adjusted, reconnect
L1, L2, S and G wires to the terminal blocks.
In the AUTO mode, the system automatically cools or heats the
room according to the user-selected set point. mode, the system
automatically cools or heats the room according to the user-
selected set point.
AUTO mode is recommended for use on Single Zone applications
only. Using AUTO changeover on multi-zone applications could
set an indoor unit to STANDBY mode, indicated with two dashes
(--) on the display, which will turn off the indoor unit until all the
indoor units are in the same mode (COOLING or HEATING).
HEATING is the system's priority mode. Simultaneous
HEATING and COOLING is not allowed.
On selected indoor units, the Up-Down Swing Louver function as
well as the control to turn off the indoor unit display, is available
on the unit’s wireless remote control. The Wi-Fi accessory and
wired remote control is not functional when using the 24V
interface.
Fig. 11 —Wiring Diagram
Power supply from outdoor
unit disconnect.
Two wires are line voltage and
the other is a ground wire.
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