System With One Heat Source Unit To Which 2 Or More Lossnay Connected - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ II Restrictions ]
2. An example of a system with one heat source unit to which 2 or more LOSSNAY units are connected
(manual address setup for both indoor and heat source units) <PQHY>
(1) Sample control wiring
L1
Leave the male Leave the male
connector on connector on
CN41 as it is. CN41 as it is.
SW2-1 OFF SW2-1 OFF
OS2 OS1
52
53
TB3 TB7 TB3 TB7
M1 M2 M1 M2 S M1 M2 M1 M2
(2) Cautions
1) ME 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) A transmission booster is required in a system to which
more than 32 indoor units (26 units if one or more indoor
units of the 72 model or above is connected) are con-
nected.
HWE09080
L2
Leave the male
Group
connector on
CN41 as it is.
SW2-1 OFF
OC
51
TB3
TB7
S
M1 M2 M1 M2 S
L3
Group
IC IC
01 02
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
MA
L12
Group
IC IC
03 04
TB5 TB15 TB5 TB15
S 1 2 S
M1 M2 M1 M2
A B
MA
(3) Maximum allowable length
1) Indoor-heat source transmission line
Same as [5] 1.
2) Transmission line for centralized control
No connection is required.
3) MA remote controller wiring
Same as [5] 1.
- 29 - 29
Interlock operation with
the ventilation unit
L4
LC
05
TB15 TB5
1 2 M1 M2 S
A B
MA
L13
LC
06
TB5
1 2 S
M1 M2
GB