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Hydro Unit
Owner’s Manual
Useful functions
Frost protection
This function performs operation with the minimum
capacity to prevent pipes from freezing in case the unit
is not used for a long period due to absence.
• When the FROST PROTECTION
button
is
pressed during heating (ZONE1 or ZONE2),
appears on the remote controller and the
temperature indication changes to “F“. The frost
protection operation starts with the set minimum
capacity (target water temperature: 15°C).
• The frost protection mode can be stopped by either
setting the end day and time using function codes or
by pressing the FROST PROTECTION
button
again on the remote controller.
• This function takes precedence over the Night
setback quiet operation that is set separately. Ask
the installation company for the minimum capacity
setting.
• Cancel schedule timer to start frost protection
operation. When frost protection is operated with
schedule timer on, it may stop during its operation.
Setting the end days and time for the frost
protection operation
Press the FROST PROTECTION
button for 4
seconds or more while the frost protection operation is
enabled (
is displayed on the remote controller), to
enter the setting mode.
• The setting mode is indicated on the remote
controller.
• Select the code number to be set with the TEMP.
buttons, and set the start time and end
time with the TIME
buttons.
Code No. 12: End days (default 00)
13: End times (default 00)
ex)
Code No. 12: 05
13: 13 = 5 days 13 hours
• Press the SET
button to determine the end days
and times.
• Press the TEST
button to exit the setting mode.
Night setback
This function is used to save heating operation during
specified time zone (sleeping hours, etc.) at night.
• When the NIGHT
button is pressed during
heating (ZONE1 or ZONE2),
appears on the
remote controller and the night setback operation is
reserved. The set temperature is lowered by 5°C
between the set start time and end time.
• To stop the night setback operation, press the
