Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 180

UNIT CONTROLLER (PC-ARFH1E)
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DHW optional functions
DHW Boost:
To force a one-time heating of the DHW
tank up to the temperature set as DHW
Boost temperature.
This feature is useful to cover exceptional
demand of DHW.
• Trigger type: Push (favourite button),
Open (NC) or Closed (NO). Set input 6
for DHW Boost (for trigger type open/
closed). (see section "8.8.2.10 Inputs,
Outputs and Sensors configuration")
• Boost setting: DHW temperature
setting for the Boost function.
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Emergency Operation
Mode:
Selection of the emergency operation mode:
• Manual: Emergency operation is active
when is manually enabled (by DSW4 pin 4
ON). The emergency mode uses the heater
(space heating or DHW) to provide the
required heating.
• Automatic: Emergency mode operates
when there is an event of outdoor unit failure
and Demand ON of space heating (enabled)
or DHW (enabled).
166 PMML0575 rev.2 - 03/2022
Circuit Pump: By using this output, user
can heat all the water inside DHW piping
system. Output must be configured at the I/O
and sensors menu. (see section
Inputs, Outputs and Sensors configuration")
• Disabled.
• Demand: Enable DHW recirculation.
• Anti Legionella: Allows DHW recirculation
while anti legionella is active.
• Timer: A timer can be programmed in order
to start or stop the water recirculation.
Recirculation timer:
• Frequency: Allows to select when timer is
applied (Everyday, weekend, workday)
• Starting Time: When the water pump
circulation starts.
• Stopping Time: When the water pump
circulation stops.
• Operation: In case of ON, means that
water pump is always ON between
"Starting Time" and "Stopping Time". In
case it is set to Timer, Recirculation pump
is ON during "ON Time" after being OFF
during "OFF Time" within Starting Time
and Stopping Time.
• ON Time: On time period of Recirculation
pump.
• OFF Time: Off time period of
Recirculation pump.
Space Heating:
Enable or disable emergency operation for
space heating.
Only available in case "Heating source"
on "8.8.2.7 Complementary Heating
configuration" contains "Electrical heater or
boiler" option
DHW:
Enable or disable emergency operation
for DHW. Only available when electrical
heater for DHW is enabled (by DSW).
"8.8.2.10