System In Which Two Indoor Units Are Grouped With The Ma Remote Controller - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[2-7 Example System with an MA Remote Controller ]
2-7-4

System in which Two Indoor Units are Grouped with the MA Remote Controller

(1) Sample control wiring
L1
Leave the male Leave the male
connector on connector on
CN41 as it is. CN41 as it is.
OS
52
TB7 TB3 TB7
M1M2 S M1M2 M1M2
(2) Cautions
1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.
2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).
3) Although two indoor controllers (controller circuit boards)
are equipped inside the P500 models of indoor units, the
board on No.2 side (lower side) is not used. Do not con-
nect wiring to the lower controller circuit board.
4) No more than two MA remote controllers (including both
main and sub controllers) can be connected to a group of
indoor units. If three or more MA remote controllers are
connected, remove the wire for the MA remote controller
from the terminal block (TB15).
BS_02_C
L2
Leave the male
connector on
CN41 as it is.
OC IC
51
01
TB3 TB5-1
S M1M2
A1 B1 S
TB15
1 2
m1
A B
MA(Main)
02
TB5-2
A2 B2 S
L1 L2
Leave the male
connector on
CN41 as it is.
OS OC
54 53
TB7 TB3 TB7 TB3
M1M2 S M1M2 M1M2 S M1M2
m2
m3
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Same as 2-7-1
2) MA remote controller wiring
Maximum overall line length (0.3 to 1.25mm
16])
m1+m2+m3
IC
*Two indoor controllers
03 (controller circuit boards)
are equipped in the indoor
TB5-1
unit (P500).
A1 B1 S
TB15
1 2
A B
MA(Sub)
04
TB5-2
A2 B2 S
2
200m [656ft]
[AWG22 to
17
chapter 2 -