Hitachi RAS-3-HVNC - Available Optional Signals

6. Optional functions
148
SMGB0079 rev.0 - 01/2013
6.1.2 Available optional signals
The outdoor units have the following signals that are described in the following table.
These signals are set up through the PCB of the outdoor unit.

RAS-(2-2.5)HVNP / RAS-3HVNC
Input signals
Ind. Input signal Application Port
0
No setting application No setting —
1
Fixing the heating mode
This signal allows to pre-x the operation mode, in this case the heating
mode, independently of what the indoor unit requests. If the indoor units
request the oposite mode than the outdoor unit, the compressor will not start.
This is very useful to set up a unique operation mode.
CN1 and CN2
2
Fixing the cooling mode
This signal allows to pre-x the operation mode, in this case the cooling
mode, independently of what the indoor unit requests. If the indoor units
request the oposite mode than the outdoor unit, the compressor will not
start. This is very useful for computer rooms where the cooling mode is xed
throughout the year.
CN1 and CN2
3
Demand thermo OFF
This signal allows to stop the compressor if it reaches a certain power as well
as to put the indoor unit in Thermo-OFF. This is very useful for installations
with high power consumption.
CN1 and CN2
4
Forced stoppage
This signal allows to control the stoppage of the compressor and the fans of
the indoor as well as outdoor units. This is very useful when used with the
alarm signals of the re prevention systems.
CN1 and CN2
5
Current control demand 60%
This signal allows to regulate current consumption and establish an average
consumption of 60% of the rate point. This is very useful for installations that
run 24 hours a day.
CN1 and CN2
6
Current control demand 80%
This signal allows to regulate current consumption and establish an average
consumption of 80% of the rate point.This is very useful for installations that
run 24 hours a day.
CN1 and CN2
7
Current control demand 100%
This signal allows to regulate current consumption and establish an average
consumption of 100% of the rate point. This is very useful for installations
that run 24 hours a day.
CN1 and CN2
Output signals
Ind. Output signal Application Port
0
No setting application No setting —
01
Operation signal
This signal allows to pick up the machine’s operation signal. This is very
useful to start up additional systems such as humidiers, fans and other ad-
ditional air-conditioning systems.
CN7
02
Alarm signal
This signal picks up the machine’s alarm. This is very useful to warn that an
alarm has been tripped.
CN7
03
Compressor ON signal
This single allows to pick up the compressor’s operation signal. It is very
useful for checking signals during remote-control operation and for the
interlock of the outdoor unit.
CN7
04
Defrost operation signal
This signal allows to pick up the defrosting of the unit. This is very useful to
know how the indoor unit is operating if there is an abnormal situation.
CN7
N O T E
Donotsetsamefunctiontomultipleinputport.Ifset,thehigherinputterminalnumberwillbecancelled.