Hot Water Tank Configuration - Hitachi YUTAKI RWM-2R1E Installation & Operation Manual

UNIT CONTROLLER (PC-ARFH2E)

9.13.4.4 Hot Water Tank configuration

Setting temperature:
Setting for domestic hot water
temperature selected by the user. The
maximum value of this setting depends
on the Maximum setting temperature set
by the installer. (Between 30 to maximum
setting temperature.)
HP Control:
• To achieve the DHW setting
temperature it is possible to select
between two different modes of
control:
• ΔT: The most efficient way to
achieve the setting temperature.
The outlet water temperature is 15º
higher than the tank temperature,
increasing gradually until achieve
the target water outlet temperature
(setting temperature).
• Fix: This is the fastest way to
achieve setting temperature. The
outlet water temperature is set to HP
Control setting. HP Control setting
can be only adjuested in case HP
Control is Fix.
Maximum setting temperature:
Maximum value of DHW setting
temperature permitted by the installer.
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
• Not available in High demand mode.
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.
• Not available in High demand mode.
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Status of Hot Water Tank:
• Deactivated
• Enabled (by default for YUTAKI S COMBI).
Mode:
• Standard: DHW heating operation starts when
the temperature of the water in the tank is low
enough to start up the heat pump. DHW is
heated up with the heat pump or the electrical
heater (if electrical heater is enabled).
• Economic (Only for YUTAKI S COMBI):
DHW heating operation starts under
same conditions as Standard Mode with
the difference that water temperature
measurement is done at higher tank position.
Due to this fact number of DHW operations
decrease and its duration becomes longer
which becomes more efficiency.
• High Demand: DHW heating operation starts
if water temperature and setting temperature
difference is larger than differential
temperature. DHW can be heated up using
the heater, the heat pump or a combination
of both.Only available when Hot Water Tank
heater is activated (DSW4 pin 3 ON).
HP OFF differential temperature:
Hysteresis for the stop of DHW heating
operation with the heat pump.
HP ON differential temperature:
Hysteresis for the start of DHW heating
operation with the heat pump.
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
• Not available in High demand mode.