System With Two Refrigerant Circuits - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[2-7 Example System with an MA Remote Controller ]
2-7-2

System with Two Refrigerant Circuits

(1) Sample control wiring
CN41
Replace
(2) Cautions
1) Assign the sequential number to the indoor units.
2) Do not connect the terminal blocks (TB5) on the indoor
units that are connected to different outdoor units with
each other.
3) Replacement of male power supply switch connector
(CN41) must be performed only on one of the outdoor
units.
4) Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only
one of the outdoor units.
5) When the power supply unit is connected to the trans-
mission line for centralized control, leave the male con-
nector on the female power supply switch connector
(CN41) as it is. (Factory setting)
BS_02_C
L1
CN40
OC IC
51
01
TB3
TB7 TB5-1
M1M2S M1M2
A1 B1 S
TB15
Connect
1 2
Leave the male
A B
connector on
MA
CN41 as it is.
OC
52
02
TB5-2
TB7 TB3
M1M2 A2 B2S
M1M2 S
Not connect
L2
*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Maximum distance (1.25mm
L1, L2 200m [656ft]
2) Transmission line for centralized control
Maximum line distance via outdoor unit.
2
(1.25mm [AWG16] or larger)
L1+L31+L2 500m [1640ft]
2
[AWG16] or larger)
13
chapter 2 -