Setting Of External Input And Output; Optional External Output Signals - Hitachi UTOPIA RAS-4HVRP2E Service Manual

6 Optional functions
RAS-3HVRC2

6.1.2.2 Setting of external input and output

If the initial setting has to be modified, the following instructions must be followed:
1 DSW301 PIN4 of the outdoor unit PCB must be set to "ON" before the modification in order to prevent activation of
the compressor. (The setting must be carried out during the stoppage of the outdoor unit.)
2 Set DSW2 PIN6 ON for "External Input and Output Setting", it will be displayed on the 7-segment display.
3 Pressing PSW2 and PSW3 changes the input/output terminal name. After the each input/output name appear the
function number, pressing PSW1 it can be changed.
4 After selecting the control function number, turn OFF DSW2 PIN6. The display will be back to the normal operation.
Then turn OFF the DSW301 PIN4. The selected data is stored in the outdoor unit PCB1 and the "External Input and
Output Setting" is completed. The stored data is maintained even when the power source is cut OFF. Refer to the
next table for the details for the electrical wiring connection and the required parts.
Specifications of required main parts
Components
3-pin connector cable
Cable (Inside the unit) Low voltage
?
N O T E
• The terminal cable must be as short as possible.
• Do not place the cables alongside the high voltage cables. Maintain at least 30 cm of distance between the cable and the high voltage
cable. The cables may be crossed. If necessary to place the cables alongside the high voltage cable, insert the low voltage cables
inside a metal conduit and ground it one of the end. If sealed cables are used for the low voltage cables, ground it one of the end of
the shield cable.
• The maximum length must be within 70 m.

6.1.2.3 Optional external output signals


Output signals through 7-segment display
The system has several input and output signals, which can be selected using the following connectors of the PCB:
• Output connector CN7, which has two ports to configure two optional output signals.
The selection of these input and output signals represents the selection of some optional functions programmed in the
PCB through the 7-segment display.
108 SMGB0136 rev.0 - 07/2021
Function
Switch setting
contents with
PSW1
3
I/O terminal
name
Function
I/O terminal
name
Function
I/O terminal
name
Function
I/O terminal
name
Function
Specifications
PCC-1A (Accesory)
(connected to a JST Connector, XARP-3)
0.3 mm
2
1
Input setting 1
Input setting 2
Input setting 3
Output setting 1
Output setting 2
Remarks
5 cables with connectors in a single
assembly
Less than 24 V