Hitachi RAS-2WHVRP User Manual

ENGLISH
7.8.2.7 Complementary Heating conguration
Heating Source:
• HP Only
• HP + Heater
• HP + Boiler
• HP + Heater + Boiler (Only for
YUTAKI S and YUTAKI S COMBI)
Solar combination:
The solar combination will enable you to heat
up your domestic water by means of the sun
whenever the sun is available.
• Set input 4, output 4 and sensor (see section
“8.6.2.9 Setup of inputs, outputs and sensors”)
• Disabled: No solar Kit is installed.
• Input Demand: Alternative DHW tank operation is done by solar system or
YUTAKI unit. Solar input can disable DHW operations done by YUTAKI unit.
- DHW Hysteresis (OFF, 35 ~ 240 min)
- DHW Maximum Time (5 ~240 min)
• Total Control: YUTAKI units controls the solar operation for the system, based
on different temperatures: DHWT is heated by either the hot water that comes
from the solar panels or the hot water that comes from the heat pump, depending
on the solar temperature. See detailed information in “Solar combination - Total
control”.
Boiler combination: Boiler will only operate if
unit is in Space Heating or Hot Sanitary Water
modes. It will always be disabled in any other
mode (Swimming Pool and Cooling mode). Set
output 3 and sensor 1 for boiler (see section
“8.6.2.9 Setup of inputs, outputs and sensors”)
See detailed information in “Boiler combination”
Electrical heater: (Only when heating source
is congured as HP+Heater or HP+Heater +
Boiler) . See detailed information in “Electrical
heater”

Electrical heater
Operation:
• Starting: Space Heating electric Heater is switched ON in
case of low water temperature and low ambient temperature
to provide extra capacity to HP.
• Backup: Space Heating Electric Heater is switched ON
in case of low ambient temperature (below Bivalent point)
in order to provide extra capacity to HP at coldest days of
winter.
Bivalent point:
• Electric heater is enabled to operate in case ambient
temperature goes below this value. Only in case of Backup
option.
Supply setting offset:
• Setting offset for electric Heater. Higher values imply earlier
stoppage of electric heater and vice versa. Only in case of
Backup option.
Inter stage time:
• Time of Electric Heater phase overlapping when there is
switch ON/OFF transition from/to phase 1 to/from phase 2.
Only in case of Backup option.
Waiting time:
• Delay time to start Electric Heater
in case all conditions allow Electric
Heater to start after HP has been
started. Only in case of Backup
option.
Proportional band:
• Control to determine how fast setting
temperature is going to be reached.
Higher values imply fast achievement
of water setting point and therefore
higher utilization of heater.
Reset factor:
• Used to guarantee setting temperature
achievement without surpassing
its value. Higher values imply less
utilization of heater.
UNIT CONTROLLER
PMML0510 rev.1 - 10/2019
101

Hitachi RAS-2WHVRP Specifications

General

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