System In Which Two Ma Remote Controllers Are Connected To One Indoor Unit - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[2-7 Example System with an MA Remote Controller ]
2-7-3

System in which Two MA Remote Controllers are Connected to One Indoor Unit

(1) Sample control wiring
Leave the male
connector on
CN41 as it is.
OS
52
TB7
M1M2S 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
L1 L2
Leave the male
connector on
CN41 as it is.
OC
51
TB3 TB7 TB3 TB5-1
M1M2S M1M2 A1B1 S
TB15
1 2
m1
A B
MA(Main)
TB5-2
A2 B2 S
IC
01
*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).
m2
A B A1 B2
MA(Sub) MA
02
(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 200m [656ft]
2
[AWG 22 to
15
chapter 2 -