System Description - Hitachi EXV-2.0E2 Manuel D'installation Et De Fonctionnement

SYSTEM DESCRIPTION

3 SYSTEM DESCRIPTION
The following figure shows an installation example for air handling units (AHU).
Nº Description
1 HITACHI outdoor unit
2 DX-Interface EXV-(2.0-10.0)E2
3 Control box
4 Expansion valve box
5 Remote controller (Optional)
6 Unit or device with heat exchanger
7 DX- heat exchanger
8 Liquid line
9 Gas line
10 Outdoor - Indoor communication
11 Power supply
12 Expansion valve control communication
!
C A U T I O N
• The installation distance between the DX-Interface and the device with heat exchanger must be the shortest possible.
• Keep the distance between the unit or device with heat exchanger and the expansion valve box for the piping length up to 5m. Also the elevation
difference between the unit or device with heat exchanger and the expansion valve box must be no more than 2m.
• Make sure that the installation distance between the control box and the unit or device with heat exchanger is short enough that the thermistors
sensing are not distorted.
• The thermistor cable should never be installed in the same ducting as power or control cables.
3 PMML0293A rev.2 - 08/2016
Nº
13 Remote controller communication
14 Outdoor air (AHU applications)
15 Supply air (AHU applications)
16 Return air (AHU applications)
17 Exhaust air (AHU applications)
18 Liquid pipe thermistor (THM3, PCB1)
19 Gas pipe thermistor (THM5, PCB1)
20 Inlet DX-coil thermistor (THM1, PCB1)
21 Outlet DX-coil thermistor (THM2, PCB1)
22 Field supplied controller (Optional)
23 Duty signal (0~10V, 0~5V, 4~20mA) (Optional)
Description