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2. MCU specification
Model
MCU-S12NEK1N
Example
installing
(Each port
MCU-S4NEK3N
connection)
Example
installing
(MCU series
connection)
Indoor units under 16.0 kW (54 kBtu/h): Y-connector is not required
Indoor units 16.0 kW ~ 32.0 kW (54 ~ 108 kBtu/h): Y-connectors at the gas and liquid lines are required
If continuous cooling operation is required when outside temperature is below -5 °C (23°F), set outdoor option setting "Expand
Installing
operational temperature range for cooling operation (HR only)", and use Y-connector on the liquid and gas pipes for indoor
indoor units
units 5.0 ~ 16 kW (18 ~ 54 kBtu/h).
When MCUs are connected in series, the maximum capacity of all indoor units in MCU series connection is the larger value of
MCU which are connected in series.
Example: MCU-S12NEK1N + MCU-S6NEK2N 85.0 kW (290MBH)
[MCU-S6*, MCU-S4*, MCU-S2*, MCU-S1*]
When twinning 2 adjacent ports, Y-connectors can only be connected to the port combinations noted below.
Allowed Y-connector port combinations: A + B, C + D, E + F ports
Y-connector port combinations that are NOT allowed: B + C port, D + E port, any non-continuous port (example: A+C)
Set Dip Switch Settings when using Y-connector
Using
Y-connector
S/W Option
ON
1
2 3 4
Default
MCU series connection
MCU
S/W Option
S/W Option
ON
ON
1
2 3 4
1
2 3 4
Combination of
Combination of
C+D port
A+B port
MCU-S8NEK1N
MCU-S2NEK2N
MCU
S/W Option
ON
1
2 3 4
Combination
of E+F port
MCU-S6NEK2N
MCU-S1NEK1N
13
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