Mitsubishi Electric City Multi PUHY-P500YSHM-A Service Handbook page 35

[ II Restrictions ]
(3) Sample control wiring (When PFAV-P500VMH-E and PUHY-P500YSHM-A system (connect the system controller to
the transmission cable for the centralized control))
Note 1. When only the LM adapter is connected, leave SW2-1 to OFF (as it is).
(1) Cautions
1) Three or more MA remote controllers cannot be connect-
ed to indoor units in the same group.
2) Do not connect together the terminal blocks (TB5) of in-
door units connected to different outdoor units.
3) Replace the CN41 power connector with the CN40 pow-
er connector for just one unit in the system.
4) Connect the shielded earth (S terminal) of the transmis-
sion terminal block (TB7) for the central controller to the
earth of the outdoor unit for which the power supply con-
nector was replaced.
(2) Maximum allowable length
1) Indoor/outdoor transmission line
Same as [4] (2).
2) Transmission line for centralized control
Maximum line distance via outdoor unit
2
(1.25mm [AWG16] or larger)
L1+L2+L31+L3+L4 500m [1640ft]
L32+L3 500m [1640ft]
L32+L4+L31+L1+L2 500m [1640ft]
3) MA remote controller wiring
Same as [4] (1).
(3) Wiring method
1) Indoor/outdoor transmission cable
Same as [4] (2).
[Shielded cable connection]
Same as [4] (1).
2) Transmission cable for centralized control
Connect terminals M1 and M2 of the transmission termi-
nal block (TB7) for the central controller of each OC, OS
and terminals A and B of the system controller in a daisy-
chain. (Non-polarized two-wire)
For just one OC, replace the CN41 power connector on
the control board with the CN40 power connector. Set
HWE07150
CN41 as it is CN41 CN40 Replace
SW2-1 OFF ON SW2-1 OFF ON
L2
OS
52
TB7 TB3 TB7
M1M2 S M1M2 M1M2 S
CN41 as it is CN41 as it is CN41 as it is
SW2-1 OFF ON SW2-1 OFF SW2-1 OFF
Note1
L4
OS
54
TB3
TB7 TB7
M1M2
M1M2 S M1M2 S
* Supply power from the outdoor unit
L1 to the central controller
Group
OC
IC
51
01
TB3 TB5 TB 15
M1M2
A B S 1 2
Connection
A1 B2
ON ON
MA (body)
L3
Group
OC
IC
53
03
TB3 TB5
TB 15
M1M2 A B S
1 2
Not
connect
A1 B2
MA (body)
System control
A B S
the centralized control switch (SW2-1) on the control
boards of all OCs and OSs to ON.
* Only use shielded cables.
[Shielded cable connection]
Use the earth of the shielded cable to connect the S ter-
minal of the terminal block (TB7) of each OC and the S
terminal of the system controller in a daisy-chain.
Short the S terminal and earth terminal (
nal block (TB7) of the one OC for which CN40 was re-
placed.
3) MA remote controller wiring
Same as [4] (1).
[In the case of operation with two remote controllers]
Same as [4] (1).
[In the case of indoor group operation]
Same as [4] (1).
4) Switch Setting
Refer to Chapter 3-[2]-(1) "Address Setting". (page 19)
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) of the termi-
GB