Mitsubishi Electric PAC-IF012B Technical Manual page 94

2. Air to Air application
Air-Handling Unit
with split outdoor unit + IF
*variable capacity request signals for Heat Pump is calculated by IF.
1) System outline
PAR-21MAA
Remote Controller
(for user interface)
Split
O/U
2) Wiring / Switch setting
Flow temp.thermistor
Refrigerant pipe (liquid) temp.thermistor
Refrigerant pipe (2phase) thermistor
PAR-21MAA
Remote Controller
(for user interface)
SW1
ON
1 2 3 4 5
Fixed OFF
System select
OFF/ON/ON→Auto step mode
Fixed set temp.(not in use in this case)
Air-Handling Unit (locally supplied)
Refrigerant pipe
(Gas)
Refrigerant pipe
(Liquid)
Return Air
Return Air temp.
thermistor
TB61
1
2
3
4
5
6
1
TB62
2
3
4
5
6
TB142
2 4 6 8 10
1 3 5 7 9
(External Input)
System controller
SW2
ON
1 2 3 4 5
6 7 8
Fixed operation mode
OFF/OFF→not fi xed, depend on
LEV self control OFF
R/C setting
need to connect TH5(2phase
pipe thermistor) on AHU HEX
*system
IF
controller
(PCB)
*
*FAN
Refrigerant pipe
temp.themistors
(Liquid / 2phase)
IF board
SW1 SW2
1 1 1
8 8 8
OFF/ON OFF/ON OFF/ON
1
SW6
2
OFF/ON
CNX1 CNX2 CNX3 CNX4 CNX5 CNX6
12 14
1 3 1 3 1 3 1 3 1 3 1 3
11 13
(External Output)
X1 X2 X3 X4 X5
IF 1 3 1 3 1 3 1 3 1
At site
Auxiliary heater
Fan
(ON/OFF)
SW3
ON
6 7 8 1 2 3 4
Fixed OFF LED display setting
(refer to page34)
Fixed OFF
94
Outlet Air
*Auxiliary
heater
* locally supplied
SW3
CNS2
1 2
TO OUTDOOR UNIT
S1 S2 S3
TB6
CNX7
L N
1 3
To metal chassis
X6 X7
3 1 3 1 3
CNX1~X7
SW6
ON
1 2
5 6 7 8
Fixed OFF
Analog input setting
IF (not in use in this case)