Daikin ALTHERMA HT Service Manual page 110

Field Setting
Note :
 [8-03] Quiet mode
 [8-04] Freeze-up prevention
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Before activating emergency operation, be sure to activate theat hetaer kit. The heater will
stay in emergency mode unit the field setting is set back to default [8-02]=0.
The unit has a quiet mode functionality for which 3 levels can be selected:
 [8-03] = 1 low noise level 1 (default)
 [8-03] = 2 low noise level 2
 [8-03] = 3 low noise level 3
Activating this quiet mode is done by pushing the QUIET MODE button on the remote
controller or through the schedule timer.
The unit has a freeze-up prevention functionality for which 3 levels can be selected:
 [8-04] = 0 prevention level 0 (default: no prevention)
 [8-04] = 1 prevention level 1
 [8-04] = 2 prevention level 2
The freeze-up prevention is only active when the unit is in thermo OFF condition. If
prevention level 1 is enabled, the freeze-up prevention will start if the outdoor ambient
temperature <4°C and if leaving or return water temperature <7°C. For prevention level 2,
the freeze-up prevention will start as soon as the ambient temperature <4°C.
For both cases the pump will operate and if leaving or return water <5°C for 5 minutes the
unit will start up to prevent too low temperatures.
It is advised to enable freeze-up prevention if the indoor unit is located in a colder ambient
room (e.g. garage, ...) to prevent water freeze-up.
ESIE09-08B
Test Operation