Hitachi YUTAKI Series Installation And Operation Manual page 144

YUTAKI CASCADE CONTROLLER
Maximum time:
Maximum time that DHW operation can
work using heat pump mode. When the
heat pump is stopped by this function,
DHW is still heated by DHW heater
when it is enabled, until other conditions
request stoppage.
• Range: OFF, 5 ~250 min
• Only in High Speed control and
Standard mode.
Cycle time:
Defines the minimum time between 2 heat
pump cycles of domestic hot water.
DHW will be able to operate again after
wait in Thermo off the specified cycle time.
• Range: 0 ~24 hour
• Only available in Standard mode.

Anti Legionella function
134 PMML0510 rev.1 - 10/2019
3 / 4
4 / 4
Status of anti legionella operation (enabled/disabled)
Specified day for anti legionella operation
Specified time of the day for anti legionella operation
Setting for domestic hot water temperature in anti legionella operation..
Duration of shock treatment. Between 10 to 60 minutes.
Space priority status:
If space priority function is enabled,
Heat Pump operation by DHW mode
stops (and continue with DHW heater, if
necessary).
This function is only performed if space
heating or space cooling can be done. If
it is not possible, operation will continue
in DHW normally.
• Only available in Standard mode.
Space priority temperature:
Threshold value of outdoor ambient
temperature for the activation of the space
priority function.
• Range: -20~0 ºC
• Only available in Standard mode.
DHW Heater: Only available when DHW heater is
activated (DSW4 pin 3 ON).
• Waiting time: Enable or disable waiting time for
DHW heater.
• Electrical Heater waiting time: Waiting time for
the beginning of electrical heater operation since
compressor start-up.
• Only available in High Speed control.
Anti Legionella:
In order to help prevent against Legionella in the
DHW system, the DHW set point can be raised to
a higher than normal temperature.
The Legionella protection only makes sense if
there is a DHW electric heater to raise the DHW
temperature to this high temperature.
See the possible configurable parameters below.