Hitachi RAS-2WHVRP User Manual

ENGLISH
8.6.2.4 Domestic Hot Water (DHW) conguration
Control:
• High Efciency: Compressor operation is
adjusted to optimal efciency for lower power
consumption. Electrical heater only works when
the maximum working temperature of the heat
pump is achieved.
• High Speed: The heat pump is switched to
maximum operation capacity to heat up the tank
in the shortest time.
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:
• Δ T: The most efcient 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.
HP Control setting:
Selection of the DHW temperature for
the Fix HP Control.
Status of DHW:
• Disabled
• Enabled.
Mode: Only available when DHW heater is
activated (DSW4 pin 3 ON).
• 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).
• High Demand: DHW heating operation starts
if water temperature and setting temperature
diference is larger than differential temperature.
DHW can be heated up using the heater, the
heat pump or a combination of both.
1 / 4
2 / 4
Differential temperature:
Value that the unit restart heating operation of the
tank.
• Only available if DHW is in High demand mode.
HP ON differential temperature:
Hysteresis for the start of DHW heating operation
with the heat pump.
HP OFF differential temperature:
Hysteresis for the stop of DHW heating operation
with the heat pump.
YUTAKI CASCADE CONTROLLER
PMML0510 rev.1 - 10/2019
133

Hitachi RAS-2WHVRP Specifications

General

Brand	Hitachi
Model	RAS-2WHVRP
Category	Heat Pump
Language	English