Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 172

UNIT CONTROLLER (PC-ARFH1E)
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.
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Anti Legionella function
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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.