Daikin RZQG71~140L7V1B Service Manual page 117

Function Details
3.2.8 General Electronic Expansion Valve Control
When cooling/heating, PI control of electronic expansion valve is conducted to keep the heat
exchanger outlet subcooling degree constant.
•
•
 The value of target heat exchanger outlet subcooling degree varies depending on change of
3.2.9 Hot Start Control (Only in Heating Operation)
In heating, when performing a startup, or after the defrosting cycle has been completed, the
indoor fan will be controlled in order to prevent cold air draft and secure the starting
performance (quick pressure build-up).
106
Target heat exchanger outlet subcooling degree > actual heat exchanger outlet subcooling
degree
 The electronic expansion valve will close.
Target heat exchanger outlet subcooling degree < actual heat exchanger outlet subcooling
degree
 The electronic expansion valve will open.
discharge pipe superheat degree of inverter compressor, etc.
Indoor unit fan: OFF
Heating operation is turned ON with remote controller.
Indoor unit fan: LL tap
(
&
Indoor unit fan: L tap
(
&
Indoor unit fan: M tap
(
&
Indoor unit fan: Set fan speed
Condition
A Indoor unit heat exchanger temperature > 34°C
Indoor unit heat exchanger temperature > indoor suction
B air temperature +17°C
(+12°C if outdoor air temperature is < 5°C)
Indoor unit heat exchanger temperature > indoor suction
C air temperature +22°C
(+20°C if outdoor air temperature is < 5°C)
• 1 minute elapsed with LL tap
(
• Condition A is met.
• Condition B is met.
OR
• 3 minutes elapsed after compressor startup
• 1 minute elapsed with L tap
(
• Condition A is met.
• Condition B is met.
OR
• 5.5 minutes elapsed after compressor startup
(Continuing L tap on indoor unit without M tap equipped)
• 1 minute elapsed with M tap
(
• Condition A is met.
• Condition C is met.
OR
• 10.5 minutes elapsed after compressor startup
ESIE12-06
Function and Control