Freeze-Up Protection Control; Conditions For Start Controlling; Control In Each Zone - Daikin Altherma EKHBH Series Service Manual

General Functionality
1.4

Freeze-up Protection Control

1
Outline
2
Conditions for start
controlling
Control in each
zone
3
4
5
2–6
During cooling operation, the signals being sent from the hydro-box allow the operating frequency
limitation and then prevent freezing of the indoor heat exchanger. (The signal from the hydro-box must
be divided into the zones as the followings.
Judge the controlling start with the indoor heat exchanger temperature after 2 sec from operation start.
Heat exchanger
thermistor temperature
A
B
C
D
E
ESIE06-03
Return / Reset zone
Up zone
Keep zone
Drooping zone
Stop zone
Part 2 – Functional Description