Description Of Optional Input Signals; Selection Of The Input Signal - Hitachi RAS-(3-6)HVRNM2E Service Manual

6 Optional functions
•

Selection of the input signal

If the below setting change is required on-site, perform the follow-
ing 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
i 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, imme-
diately 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
165
SMGB0064 rev.0 - 08/2011
(*) Set
Function N°
→
←
Input setting 1
CN1, 1-2
PSW1
SET* PSW2 PSW3
Input setting 2
CN1, 2-3
PSW1
SET* PSW2 PSW3
Input setting 3
CN2, 1-2
PSW1
SET* PSW2 PSW3
Output setting 1
CN7, 1-2
PSW1
SET* PSW2 PSW3
Output setting 2
CN7, 1-3
PSW1
SET* PSW2 PSW3
1
Factory setting
~
Factory setting
~
Factory setting
~
Factory setting
~
6
Factory setting
~