Daikin EBLA04E V Series Service Manual page 257

To check if the refrigerant circuit is clogged
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
a Liquid stop valve
b Gas stop valve
2 Check if the stop valves are completely open.
The refrigerant circuit stop valves are
open?
Yes
No
1 Turn ON the power of the unit.
2 Activate Heating operation via the user interface.
3 Wait for the system to run at a more or less stable condition.
4 On the refrigerant liquid piping (between the refrigerant/water heat
exchanger and the outdoor unit heat exchanger (coil)), using a contact
thermometer, measure the temperature before and after every restricting
device. If a big temperature difference is measured (>2.5~4K), an internal pipe
obstruction may be present at this location.
INFORMATION
Focus on positions with a potential risk for clogging such as:
▪
Filters
▪
Valves
▪
Brazing points
▪
...
INFORMATION
A bigger temperature drop before and after the expansion valve can be normal,
however excessive ice is indicating a malfunction of the expansion valve or internal
obstruction of the valve (dirt or ice build up in case of humidity in the system).
5
a
b
Action
Return to the troubleshooting of the
specific error and continue with the
next procedure.
Open the stop valves of the refrigerant
circuit, see
procedures" [
| Third party components
"5.2.2 Repair
4
261].
Service manual
draft – 31/05/2022 15:53
257