18
MDC UNIT ADDRESSING
Setting the Unit Address —
The address switch [S8]
of each MDC unit is set to “00” when the unit is shipped from
the factory.
• Set the address of the main MDC to “000”.
• Set the address of sub MDC to “000” or “010”
Merged Port Setting
—
When two ports are merged to
connect a larger indoor unit (> 54 kBtu/h), the following
switches should be set to the “ON, ON” position.
S1: Port 1 and 2 pipes are merged, set to “ON, ON” position
S3: Port 3 and 4 pipes are merged, set to “ON, ON” position
S5: Port 5 and 6 pipes are merged, set to “ON, ON” position
S7: Port 7 and 8 pipes are merged, set to “ON, ON” position
The indoor unit communication cable is connected to one of
the two ports.
TROUBLESHOOTING
LED Indication Lamp Instructions —
When the
LED indication lamp is intermittent flashing it means
communication error. Table shows a description of what the
flashing LED lights mean.
Table 19 — LED Light Description
Error Code —
MDC error codes are displayed on the units
display (DSP1 and DSP2) as shown in Fig. 23 and 24. Table 20
shows display code definitions. Table 21 shows MDC query
codes.
Fig. 24 — Size 016/016L Typical Wiring Diagram
3803
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Indoor No. 1
P Q
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CN59
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Indoor No. 2 Indoor No. 3
P Q
Indoor No. 4
P Q
Indoor No. 5
P Q
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Indoor No. 6 Indoor No. 7
P Q
Indoor No. 8
P Q
P Q
Indoor No. 9
P Q
Indoor No. 10
P Q
Indoor No. 11 Indoor No. 12
P Q
P Q
Indoor No. 13 Indoor No. 14
P Q
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Indoor No. 15 Indoor No. 16
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, actual product may vary
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S8
S1
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LED
NORMALLY
ON
SLOW FLASH
FLASH
LED1 Lamp
(Red)
Outdoor unit
ON
Outdoor unit
standby
Communication
error with
outdoor unit
LED2 Lamp
(Blue)
Indoor unit ON
under this
micro
processor
Indoor unit OFF
under this
micro
processor
Communication
error with
indoor unit
