Daikin Sky Air Advance RZA200D7Y1B Service Manual page 138

4 | Third party components
To check if the refrigerant circuit is clogged
Service manual
138
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
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Wait for the refrigerant to reach the outdoor temperature.
2 Connect a manometer to the high pressure and low pressure service ports.
3 Turn ON the power of the unit.
4 Activate Heating operation via the user interface.
5 Read the pressure on the high and low pressure gauges. If there is a significant
difference between high and low pressure, the refrigerant circuit might be
clogged.
6 On the refrigerant liquid piping (between the indoor unit 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
▪
...
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" [
"4.2.2 Repair
4
142].
RZA200+250D7Y1B
Sky Air Advance-series
ESIE19-13A – 2020.05