Daikin FTXJ-M - Part 4. Maintenance; 4.1. Indoor unit; 4.2. Outdoor unit

ESIE16-02K | Part 4. Maintenance 4.1. Indoor unit
31/05/21 | Version 1.1 Page 89
RA R32 Split & multi split M-Series
Part 4. Maintenance
This part contains the following chapters:
4.1. Indoor unit
4.1.1. General maintenance
1. Optimal operation conditions
2. Correlation of air-conditioner's operation status, pressure and running current
* Water in the refrigerant freezes inside the electronic expansion valve and is basically the same phenomenon as pump down.
** Dirt in the refrigerant clogs filters inside the piping and is basically the same phenomenon as pump down.
*** Pressure differential between high and low pressure becomes low.
3. Clean the indoor heat exchanger (if necessary. Example: contaminated by cooking oil, …).
- Use proper field supply cleaning agent which is suitable for cleaning heat exchangers and drain pans.
- Clearly follow the instructions of local supply cleaning agent and do not use household cleaning agents.
- Please rinse the heat exchanger and drain pan with water after the cleaning process. (*)
Indoor unit ............................................................................................................................................................................................89
Outdoor unit..........................................................................................................................................................................................91
WARNING
Before performing any maintenance, power off the unit.
INFORMATION
After all checks are made, make sure the water and brine circuits are filled properly again and fluid pressures are in line
with regulations (± 2 bar).
Cooling Heating
Differential between suction temperature
and discharge temperature
8~18°C 14~30°C
DB 27°C 20°C
WB 19°C Not applicable
COOLING Low pressure High pressure Running current
Dirty air filter Lower Lower Lower
Short circuit of air inlet/outlet Lower Lower Lower
Air mixed in refrigerant Higher Higher Higher
Water mixed in refrigerant Lower* Lower Lower
Dirt mixed in refrigerant Lower** Lower Lower
Refrigerant shortage (gas) Lower Lower Lower
Unsatisfactory compression Higher*** Lower Lower
CAUTION
* Rinse out the cleaning agent until there is no cleaning agent left. Otherwise, the corrosion of heat exchanger
and drain pan may occur.
Pay attention to the cleaning agent that may also corrode other materials of indoor unit (Aluminium, copper, plas-
tic, ABS, …).