Mitsubishi Electric PQHY-P250YHM-A, Data Book, Page: 55 / 78

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6. Sample System Connection
(1) System with MA remote controller
1) Single refrigerant circuit
Control Wiring Diagram
Notes Maximum Allowable Length
1. Leave the male connector on the female power supply switch connector (CN41) as it is.
2. Grounding to S terminal on the terminal block for transmission line for centralized control
(TB7) is not required.
3. Although two indoor controllers (controller circuit boards) are equipped inside the indoor
unit (20HP), the board on No.2 side (lower side) is not used. Do not connect wiring to the
lower controller circuit board.
4. The outdoor unit cannot be connected to the units other than the PFD series indoor units.
<a. Indoor/Outdoor transmission line>
Maximum Length (1.25mm
2
or more)
L1 + L2 200m
Wiring and Address Setting
<a. Indoor/Outdoor transmission line>
Connect M1, M2 terminals of the indoor/outdoor transmission line terminal block (TB3) on the outdoor unit (OC) and A1, B1 terminals of the
indoor/outdoor terminal block (TB5-1) on the indoor unit (IC). (Non-polarized 2-core cable) *Only use shielded cables.
[Shielded cable connection]
Connect the earth terminal of the OC and S terminal of the IC terminal block (TB5-1).
<b. Switch setting>
Address setting is required as follows.
OC
TB3 TB7
M1 M2 M1 M2 S
51
IC
TB5-1
A1B1 S
01
TB5-2
A2 B2 S
02
A B
TB15
1 2
MA
L1 L2
Leave the male connector on
CN41 as it is.
Leave the male
connector on
CN41 as it is.
OS
TB3 TB7
M1 M2 M1 M2 S
52
* One indoor controller (controller circuit board)
is equipped in the indoor unit (10HP), and two
indoor controllers (controller circuit boards)
are equipped in the indoor unit (20HP).
Main Controller
Sub Controller Settings to be made with the sub/main switch
IC
IC
OC
OS
(20HP)
1
2
Notes
3
MA
MA
51~99
52~100
02~50
01~49
00
00
Setting not required.
Sub Controller
Steps
Unit or controller
Main
(10HP, 20HP)
Sub
(20HP)
Indoor
unit
MA
remote
controller
Address
setting range
Address setting method
Outdoor unit
Factory
setting
Main
Assign a sequential odd number starting with
"01" to the upper indoor controller.
Add 50 to the address assigned to the indoor unit
connected to the same refrigerant circuit.
Set consecutive numbers for the addresses of
outdoor units in the same refrigerant circuit system.
To set the address to 100, set the
rotary switches to 50.
Assign sequential numbers starting with the
address of the main unit in the same group.
(Main unit a1)