Daikin Stylish Series - Page 134

3 | Third party components
Service manual
134
(C)(F)TXA15~50A(W)(S)(T) + (C)(F)TXA15~50B(B)(S)(T) + RXA42+50A +
RXA20~35A + RXA42+50B
Split Stylish R32
ESIE18-03C – 2020.02
To check if the refrigerant circuit is clogged
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 Using a thermometer, check for a temperature drop of minimum 4°C. The
obstruction is most likely located where this immediate temperature drop
occurs.
INFORMATION
Focus on positions with a potential risk for clogging such as:
▪ Filters
▪ Valves
▪ Brazing points
▪ …
Temperature drop found? Action
Yes Replace the clogged part, see
"3.2.2Repair procedures"[4137].
No Return to the troubleshooting of the
specific error and continue with the
next procedure.
To check if the refrigerant circuit is correctly charged
Due to the relationship to pressure control and electronic expansion valve control,
the amount of refrigerant needs to be examined according to operating conditions.
Refer to the procedures shown below for correct examination.
Refrigerant overcharge diagnosis
1 High pressure rises. Consequently, overload control is conducted to cause
insufficient cooling capacity.
2 The superheated degree of suction gas lowers (or the wet operation is
performed). Consequently, the compressor consumes more power and is
noisy (before over‑current relay trips).
3 The subcooling degree of condensate rises. Consequently, in heating, the
temperature of discharge air through the subcooled section becomes lower.