Electronic Expansion Valve Control - Daikin Altherma EKHBH Series Service Manual

ESIE06-03
3.11

Electronic Expansion Valve Control

Overview This chapter contains the following topics:
Topic
3.11.1–Fully Closing with Power ON
3.11.2–Pressure Equalization Control
3.11.3–Opening Limit
3.11.4–Starting Operation Control
3.11.5–High Temperature of the Discharge Pipe
3.11.6–Disconnection of the Discharge Pipe Thermistor
3.11.7–Control when frequency is changed
3.11.8–Target Discharge Pipe Temperature Control
Outline The following items are included in the electronic expansion valve control.
Part 2 – Functional Description
Electronic expansion valve is fully closed
Electronic expansion valve is fully closed when turning on the power.
Pressure equalizing control
Open Control
Electronic expansion valve control when starting operation
Control when frequency changed
Control for defrosting
Control when a discharge pipe temperature is abnormally high
Control when the discharge pipe thermistor is disconnected
Feedback Control
Discharge pipe temperature control
Outdoor Unit Functional Concept
See page
2–24
2–25
2–25
2–25
2–25
2–25
2–26
2–26
1
2
3
4
5
2–23