Mdc Unit Addressing; Setting The Unit Address; Merged Port Setting; Troubleshooting - Carrier 40VMD 006 Installation And Maintenance Instructions Manual

Green
CN17 CN24 CN26 CN44 CN41
CN43 CN42 CN33 CN34
ON
ON ON
S8
S1 S3
SW8 SW9
CN16 CN3 CN57
1(M-I) 2(M-I)
M-O M-O
P Q P Q
Outdoor
/Main MDC Sub MDC
P Q P Q P Q
Indoor No. 1 Indoor No. 2 Indoor No. 3
To outdoor or MDC units
communication bus

MDC UNIT ADDRESSING

Setting the Unit Address —
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 —
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.
CN22
CN35 CN36 CN37 CN38 CN39 CN40
CN21
ON ON
S5 S7
DSP1 DSP2
CN19
CN29
CN28
CN58 CN59 CN60
3(M-I) 4(M-I) 5(M-I) 6(M-I) 7(M-I) 8(M-I)
P Q P Q P Q P Q P Q
Indoor No. 4 Indoor No. 5 Indoor No. 6 Indoor No. 7 Indoor No. 8
To indoor units communication bus
Fig. 24 — Size 016/016L Typical Wiring Diagram
The address switch [S8]
When two ports are merged to
CN17 CN24 CN26 CN44 CN41
CN43 CN42 CN33 CN34 CN35 CN36
ON
ON ON ON
S8
S1 S3 S5
SW8 SW9
CN57 CN58
CN16 CN3
1(M-I) 2(M-I) 3(M-I) 4(M-I)
M-O M-O
P Q P Q P Q P Q
Indoor No. 9 Indoor No. 10 Indoor No. 11 Indoor No. 12
To indoor units communication bus

TROUBLESHOOTING

LED Indication Lamp Instructions —
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
NORMALLY
LED
ON
LED1 Lamp Outdoor unit
(Red) ON
Indoor unit ON
LED2 Lamp under this
(Blue) micro
processor
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.
18
CN22
CN37 CN38 CN39 CN40
CN21
ON
S7
DSP1 DSP2
CN19
CN29
CN28
CN59 CN60
5(M-I) 6(M-I) 7(M-I) 8(M-I)
P Q P Q P Q P Q
Indoor No. 13 Indoor No. 14 Indoor No. 15 Indoor No. 16
When
SLOW FLASH
Communication
Outdoor unit
error with
standby
outdoor unit
Indoor unit OFF
Communication
under this
error with
micro
indoor unit
processor
XT1
L1 L2
Power in
the
FLASH