Mitsubishi Electric PUHY-P200 Service Handbook page 31

1. System using MA remote controller
(5) In the case of connecting system controller to indoor/outdoor transmission line (excluding LM adaptor)
CN41→CN40 Replace
SW2-1 OFF→ON
Leave CN41 as it is.
SW2-1 OFF→ON
Note 1. LM adaptor may not be connected to indoor/outdoor transmission line.
Prohibited items
1. M-NET and MA remote controllers can not be connected to-
gether to the indoor unit within the same group.
2. MA remote controller of 3 units or more can not be connected
to the indoor unit within the same group.
3. Do not connect together the terminal blocks (TB5) of the in-
door unit connected to different outdoor units.
4. Replacement of the power supply selecting connector (CN41)
on the outdoor unit should be done only on one outdoor unit.
5. Grounding work is required for S-terminal of the centralized
control transmission block (TB7) on one outdoor unit only.
6. The system controller connectable to the indoor/outdoor trans-
mission line counts for 3 sets maximum. While G-50 counts
for only 1 set
7. When the total number of indoor units exceeds 26 sets, the
system controller may not be connected to the indoor/out-
door transmission line.
8. When the total number indoor units exceed 18 sets and they
includes Type 200 or above, the system controller may not
be connected to the indoor/outdoor transmission line.
Control wiring example
L2
Group
OC
IC
51
01
TB3
TB7 TB5 TB15
M1M2 S M1M2 M1M2 S
Connect
L22
Group
OC
IC
53
03
TB3 TB5
TB7
M1M2 S M1M2 M1M2 S
NO
Note 1
A1 B2
System controller
A B S
Interlocking with ventilation
L3 L4
Group
IC
02
TB5 TB15
M1M2 S
1 2 1 2
A1 B2 A1 B2
MA MA
L23 L24
IC
04
TB5 TB15
TB15
M1M2 S
1 2 1 2
MA
Allowable length
a. Indoor/outdoor transmission line
Farthest length (1.25mm
≤
L2 + L3 + L4 200m
≤
L22 + L23 + L24 200m
≤
L25 200m
b. Centralized control transmission line
Farthest length via outdoor unit (1.25mm
L25 + L31 + L2 + L3 + L4
L2 + L3 + L4 + L31 + L22 + L23 + L24
c. MA remote controller wiring
The same as 1. (1)
- 29 -
LC
05
TB5
M1M2 S
NO
LC
06
TB5
M1M2 S
– Example to use shielded wire –
2 or more)
2
or more)
≤
500m
≤
500m