Hitachi RCUE40AG2 Service Manual page 53

Control system
Item
Ice/Heat storage operation by external order
Fan forced operation function
High pressure cut confi rmation test (only cooling)
Pump automatic operation function in winter
"Saving energy" priority mode <option> (only cooling)
"Silence priority" mode <option> (only cooling)
Night shift mode <option> (only cooling)
Thermo OFF selection function
pag. 51
SMGB0003 rev.0-01/2007
Contents
Full load operation is performed by external order (no-
−
voltage contact input).
Chiller unit stops when the water temperature reaches
−
the setting value (no capacity control).
Dip Switch setting is necessary. Dip Switch setting is necessary.
−
It is possible to operate only fans by an external order
−
as a countermeasure against snow while units are
stopped.
Run or Stop operation is performed by a no-voltage
−
contact .
While the actuation of high pressure interrupt device is
−
confi rmed, unit is operated with fan forcedly stopped.
Push button is set on PCB for every cycle number. Push button is set on PCB for every cycle number.
−
Operation order to pump is output automatically by
−
chiller in order to avoid freezing due to the decrease of
chilled water temperature during unit stop in winter. chilled water temperature during unit stop in winter.
It is to keep high pressure at low values when ambient
−
temperature below 30 ºC.
Since fan speed is increased, it is a saving energy
−
operation more than a silence operation.
It is an optional setting by Dip Switch. It is an optional setting by Dip Switch.
−
It is focused on a silent operation of the unit reducing
−
the fan speed.
Since the revolution number is reduced during night
−
or mid-term period, effi ciency is changed hardly in all
around the year.
Silence is given priority over saving energy.
−
It is an optional setting by Dip Switch. It is possible to
−
switch from the remote controller by the external signal
(no-voltage contact ). (no-voltage contact ).
When fan full speed operation is not needed, fan
−
revolution number is reduced, and low noise operation
is performed.
Ambient temperature target: function is valid under 30
−
°C (noise value 1-~-2dB) (changeover by no-voltage a
contact input) contact input)
There are two methods to judge Thermo OFF, possible
−
to select.
1. Immediate Thermo OFF by Thermo OFF
temperature
2. No immediate Thermo OFF if Thermo OFF
temperature continues for 3 minutes. (however, if
outlet water temperature is out of the range, it will
be immediate Thermo OFF) be immediate Thermo OFF)
4 4