Hitachi RAS-(4-12)HNP(1)(E) - Available Optional External Signals

6 Optional functions
164
SMGB0087 rev.0 - 12/2013
6.1.2 Available optional external 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.
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Input signals (CN1 and CN2)
RAS-(2-2.5)HVNP1 / RAS-3HVNC1
Ind. Inputsignal Application
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 com-
pressor will not start. This is very useful to set up a unique operation
mode.
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 com-
pressor will not start. This is very useful for computer rooms where
the cooling mode is xed throughout the year.
3
Demand thermo OFF
This signal allows to stop the compressor if it reaches a certain pow-
er as well as to put the indoor unit in Thermo-OFF. This is very useful
for installations with high power consumption.
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.
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.
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.
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.
RAS-3HVNP1E / RAS-(4-6)H(V)NP1E / RAS-(8-12)HN(P/C)(1)(E)
Ind. Inputsignal Application
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 com-
pressor will not start. This is very useful to set up a unique operation
mode.
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 com-
pressor will not start. This is very useful for computer rooms where
the cooling mode is xed throughout the year.
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. This signal is
only activated if function F1 has value 1.
4
No setting application No setting
5
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. This signal
is only activated if function F1 has value 1.