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Mitsubishi Electric PURY-P72 Service Handbook page 44

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[II Restrictions]
5. An example of a system in which a system controller is connected to the indoor-outdoor transmission line (except
LM adapter)
(1) Sample control wiring
l11
L12
_
Interlock operation with
the ventilation unil
Ct(f-eru.1\tplItt
SWHOff"'OIi
BC
57
9.IlM'.
_
IC
04
l22
,
~----------~--,
Note1 LM adapters cannot be connected to the
indoor-outdoor transmission line.
(2) Cautions
1)
M-NET remote controller and MA remote controller cannot both be
connected to the same group of indoor units.
2)
No more than 2 MA remote controllers can be connected to a group
of indoor units.
3)
Do not connect
the
terminal blocks (TB5) on the indoor units that are
connected to different outdoor units with each other.
4)
Replacement of male power jumper connector (CN41) must be per-
formed only on one of the outdoor units.
5)
Provide grounding to S terminal on the terminal block for transmis-
sion line for centralized control (TB7) on only one of the outdoor
units.
6)
A maximum of 3 system controllers can be connected to the indoor-
outdoor transmission line, with the exception that oniy one G(B)-50A
may
be
connected.
7)
When the total number of indoor units exceeds 20 (12 if one or more
indoor units of the 72 modei or above is connected), it may not be
possible to connect a system controller to the indoor-outdoor trans-
mission line.
8)
When the number of the connected indoor units is as shown in the
table below, one or more transmission boosters (sold separately)
are required.
To
connect two transmission boosters, connect them in parallel.
(Observe the maximum number of connectable indoor units that are
listed in the specifications for each outdoor unit.)
HWEOB03A
- 34-
Number of transmission
booster (sold separately)
required
1 unit
2 units
When the P72 and P96 models are not in-
27 - 50
-
eluded in the connected indoor units
units
When the P72 and P96 models are includ-
21 - 39
40 - 50
ed in the connected indoor units
units
units
'The table above shows the number of transmission boosters that
IS
required by the system with three BC controllers. For each Be con-
troller that is subtracted from the above-mentioned system, two ad-
ditional indoor units can be connected.
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Maximum distance (1.25mm
2
[AWG16] or larger)
L 11 +L 12 S; 200m [656ft]
L21 +L22 S; 200m [656ft]
L25S;200m [656ft]
2) Transmission line for centralized control
Maximum line distance via outdoor unit
(1.25mm
2
[AWG16] or larger)
L25+L31+L12(L11 )S;500m [1640ft]
L 12(L 11 )+L31+L22(L21
)S;500m [1640ft]
3) MA remote controller wiring
Same as [5] 1.
GB
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