Hitachi YUTAKI Series Installation And Operation Manual page 150

YUTAKI CASCADE CONTROLLER
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Space optional functions
Auto Heat/Cool:
Only available in units capable of heating
and cooling operation, and when cooling
operation is enabled.
Allows to set automatic switch over to
heating and cooling operation using the
same daily average outdoor temperature
of the previous day as in Heating auto ON/
OFF.
• Status: Enable or disable auto heat/
cool.
• Switch to Heat temperature: operation
switches to heating in case that the
measured outdoor temperature value is
lower than the threshold for switching to
heating.
• Switch to Cool temperature: Operation
switches to cooling in case that the
measured outdoor temperature value is
higher than the threshold for switching
to cooling.
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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
"8.6.2.9 Setup of inputs, outputs and
• Boost setting: DHW temperature setting for the
Boost function.
140 PMML0510 rev.1 - 10/2019
sensors")
Heating Auto On/Off:
To stop automatically stop heating operation
when the daily average outdoor temperature
of the previous day is higher than the defined
Switch-OFF temperature
• Status: Enable or disable heating auto on/
off function.
• Switch Off temperature: System is stopped
in case that the outdoor temperature is
higher than the Switch-OFF temperature.
• Switch On differential: Differential
temperature between average outdoor
temperature of the previous day and the
Switch Off temperature.
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 "8.6.2.9 Setup of
inputs, outputs and sensors")
• 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.