Control When Frequency Is Changed; Target Discharge Pipe Temperature Control - Daikin Altherma EKHBH Series Service Manual

Outdoor Unit Functional Concept
1
Detect
disconnection
2

3.11.7 Control when frequency is changed

3
4

3.11.8 Target Discharge Pipe Temperature Control

5
2–26
When the 630-seconds timer for open control is over, the following adjustment must be made.
When the operation mode is cooling
When the following condition is fulfilled, the discharge pipe thermistor disconnection is ascertained.
Discharge pipe temperature +6°C < outdoor heat exchanger temperature.
When the operation mode is heating
When the following condition is fulfilled, the discharge pipe thermistor disconnection is ascertained.
Discharge pipe temperature +6°C < indoor heat exchanger temperature.
When the target discharge pipe temperature control is active, if the target frequency is changed for a
specified value in a certain time period, cancel the target discharge pipe temperature control and
change the target opening of the electronic expansion valve according to the shift.
Obtain the target discharge pipe temperature from the indoor and outdoor heat exchanger
temperature, and adjust the electronic expansion valve opening so that the actual discharge pipe
temperature become close to that temperature. (Indirect SH control using the discharge pipe
temperature).
SC
Determine a correction value of the electronic expansion valve compensation and drive it according to
the deflection of the target discharge temperature and actual discharge temperature, and the
discharge temperature variation by the 20 sec.
Set the target discharge pipe
temperature as to become an aiming
SH.
Regard that the inclination cannot be
changed due to the operating
SH
condition.
Part 2 – Functional Description
ESIE06-03