10 Optional functions
Indoor unit
TCGB0123 rev.2 - 10/2019
126
10.1.2 Optional functions by Unit controller (PC-ARFH1E)
10.1.2.1 Optional functions for Space Heating or Space Cooling
Optional function Explanation Model
Floor screed drying function
(Circuits 1 & 2)
This function is used exclusively for the process of drying screed that has been newly
applied to oor heating system.
The water temperature set-point follows a predetermined schedule upon activation of the
oor screed drying function.
For more information refer to Water control chapter
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Heating Auto ON/OFF
At higher outside temperatures it doesn’t make sense to keep heating the building. The
YUTAKI S System will switch the heating off when the daily average outdoor temperature
of previously day rises above the Summer Switch Auto On/Off Activation Temperature.
For more information refer to “Space water temperature control” chapter in Service
Manual.
A
Auto Heat-Cool
Only available for Cooling and Heating models and cooling mode enabled.
By using auto summer switch off average, user can use auto heat cool mode.
The end-user sets the desired operation mode on the user interface: Heating, Cooling or
Automatic. When Automatic is selected, the change of the operation mode is based on:
Averaged outdoor temperature: the operation mode will be changed in order to always
be within range determined by the space heating OFF temperature for heating and
the space cooling ON temperature for cooling. If the outdoor temperature drops, the
operation mode switches to heating and vice versa.
For more information refer to “Space water temperature control” chapter in Service
Manual.
S/SC/M/
YCC
Outdoor temperature average
timer
The average timer corrects the inuence of ambient temperature variations. The
weather-dependent set point calculation is done on the average outdoor temperature.
The outdoor temperature is averaged over the selected time period.
For more information refer to “Space water temperature control” chapter in Service
Manual.
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10.1.2.2 Optional functions for DHW
Optional function Explanation Model
DHW anti-Legionella
protection
A specic setting is available to protect the DHW system against Legionella, which raises
up the DHW temperature over the normal DHW tank temperature setting (using the
electric heater of the DHW tank and/or the heat pump) on a periodic basis.
For more information refer to “Sanitary Water Operation” chapter in Service Manual.
A
DHW re-circulation
This function allows the activation of the water pump for the re-circulation of the hot
water from the DHW tank by means of the heat pump.
This function can also be used with the anti-legionella protection function.
For more information refer to “Sanitary Water Operation” chapter in Service Manual.
A
DHW boost
With this function enabled, it is possible to request a heating up of the DHW when user
requires an instantaneous delivery of DHW.
For more information refer to “Sanitary Water Operation” chapter in Service Manual.
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DHW Mode
DHW operation has two different modes, STANDARD Mode and HIGH DEMAND Mode:
• STANDARD Mode: The heating of the domestic hot water shall be started when
water temperature in tank is low enough for Heat Pump to be started. DHW is always
started heated by Heat Pump.
• HIGH DEMAND Mode: The heating of the domestic hot water is started if differential
is bigger than T
DHWON
. It will be started with water tank heater only unless water
temperature in tank goes below Heat Pump starting temperature.
For more information refer to “Sanitary Water Operation” chapter in Service Manual.
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DHW Control
Unit has 2 DHW heating up control modes that are selected by PC-ARFH1E:
H.EFFICIENCY MODE: Control to keep best efciency (COP).
H.SPEED MODE: Control to heat tank as fast as possible.
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