Water pump conguration
Operation mode:
• ΔT: To control the pump speed to guarantee
the ΔT between Two and Twi.
• Fix: The water pump works at the specied
speed % at the space speed menu.
Space speed:
Selection of the % for the pump speed when x
mode is selected.
DHW speed:
Selection of the % for the pump speed when
using DHW.
Swimming pool speed:
Selection of the % for the pump speed
when using Swimming pool.
Minimum OFF Time:
Minimum time of the water pump OFF.
• Only when Economic mode is active (DSW)
Minimum ON Time:
Minimum time of the water pump ON.
• Only when Economic mode is active (DSW)
Pumps during DHW:
This option allows to stop Water Pumps during
DHW operation. Water pumps that are allowed
to stop are the ones that are not directly involved
to DHW heating-up procedure. This is WP2 and
WP3 depending on the hydraulic conguration.
Overrun Time:
Added operation time of water pump
after Demand OFF.
Stop conditions:
• Standard
• Thermo OFF: The water pump stops
after Thermo OFF. (DSW5 pin 4 ON).
Pump Setup:
This option allows user to select hydraulic
conguration of the system when hydraulic
separator is used.
• Standard: WP2 is connected after WP3 by means an
hydraulic separator or directly by means Hitachi mixing kit
accessory. Whenever WP2 is switched ON, WP3 is also
switched ON in order to transfer heat to C2.
• Parallel: WP2 is directly connected to the buffer tank in
parallel with WP3. Operation of WP3 is independent of the
operation of WP2. When this conguration is used, Hitachi
mixing kit accessory cannot be used.
Option available only when there is Hydraulic separator
congured.
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Night Shift
Starting time of Nigh Shift operation
Ratio of reduction in heat pump capacity
Status of activation of Night Shift (reduction of compressor load in
order to reduce operation noise during the night hours).
Ending time of Night Shift operation
UNIT CONTROLLER (PC-ARFH2E)
PMML0575 rev.2 - 03/2022
220
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