Hitachi RCD-2.5FSN2, Service Manual

Page: 234 / 429

6 Optional functions
222
SMGB0077 rev.0 - 01/2013
Setting note: No additional setting is required once the demand control setting has been set as Duty control.
Type Description
Standard thermo-On / thermo-Off control
(Default setting)
Suitable for installations controlled by suction or discharge temperature.
The thermo-On / thermo-Off logic is decided based on the difference between the
inlet temperature to the coil and the set temperature on the remote controller or
central controller.
By an external input
The thermo-On / thermo-Off control can be driven externally by an input signal
connected to the CN3 socket of the PCB1 of the DX-Kit.
Setting note: DIP Switch 1 – Pin 6 of DX-Kit PCB2 (small PCB) must be switched on
(PCB2- DSW1#6 switched ON). Once the PCB DSW has been set, the input “i1” of
CN3 is automatically set for thermo-On / thermo-Off control. The setting of input “i2”
is kept as set on the remote controller.
Please refer to Hitachi Indoor Units Service Manual for further information about the
setting and connection of the auxiliary inputs to CN3 socket.
By the duty signal
For systems controlled by a duty signal it is possible to force the thermo-Off by the
duty signal itself. When the duty signal becomes the minimum of its range (0 V or 4
mA) the system will be switched to thermo-Off condition. To be switched to thermo-
on condition the duty must become higher than the 8% of its range.
Setting note: No additional setting is required once the demand control setting has
been set as Duty control.