Hitachi RAS-10HRNM, Service Manual, Page: 173 / 482

• Selection of the input signal
If the below setting change is required on-site, perform the
following instructions:
1 While the outdoor unit is ON, set the following DIP switches
on the printed circuit board of the outdoor unit as follows:
set pin 6 of DSW2 to ON. Because of these settings, the
function selection mode becomes available and the
following indication appears on the 7-segment display.
Input/output terminal Function N°
i 1
→
←
1
This indicates that function No.1 (set heating mode) is set at input 1.
2 By pressing the push switches PSW1, PSW2 and PSW3, you change the input/output terminal name. The flowchart
shown on the side reflects the changes on the 7-segment display when you press PSW2 and PSW3.
3 After selecting the input/output terminal name, select your required function by pushing the PSW1.
4 After setting the pin 6 of DSW2 to OFF, the selected contents are memorized in the PCB of the outdoor unit, and,
immediately afterwards, the function selection mode is set to OFF. The memorized data is maintained even when
the power supply wires are disconnected. The connection details of each function, as well as the required parts, are
described in the first section.
6.1.3 Description of optional input signals
Fixing operation mode (heating / cooling)(1/2)
This input function is fixed in terminals CN1 or CN2 of the PCB of the outdoor unit, to use it as a cooling and heating mode.
CN1 must be set up as follows.
Short circuit between the terminals 1 and 2 of CN1: set heating mode.
Short circuit between the terminals 2 and 3 of CN1: set cooling mode.
After having pre-fixed the established mode, the remote control can only be used to adjust the temperatures. Stoppage
code “d1” “20” will be displayed if an attempt is made to change the operation mode of any of the indoor units with the
remote control.
Input setting 1
CN1, 1-2 Factory setting
PSW1
SET* PSW2 PSW3
~
Input setting 2
CN1, 2-3
Factory setting
PSW1
SET* PSW2 PSW3
~
Input setting 3
CN2, 1-2 Factory setting
PSW1
SET* PSW2 PSW3
~
Output setting 1
CN7, 1-2 Factory setting
PSW1
SET* PSW2 PSW3
~
Output setting 2
CN7, 1-3 Factory setting
PSW1
SET* PSW2 PSW3
~
(*) Set
6 Optional functions
165
SMGB0060 rev. 1- 12/2010
6