Discharge Pipe Temperature Control; Oil Recovery Control (Applicable For Arxn/Rxn_L) - Daikin FTXB50BV1B Service Manual

Function & Control

2.18 Discharge Pipe Temperature Control

Used as a measure of the compressor's internal temperature.
Compressor frequency is control to keep this temperature from going up further when it rises above a certain
level.
Discharge temperature
110°C
102°C
If compressor discharge temperature > 102°C for the fi rst time, this control starts and set the current
frequency as upper limit. At the same time, running frequency start to reduce by 1 step and so on, until
temperature falls between 99°C and 90°C at the maintain zone.
This protection is activated when the compressor discharge temperature > 110°C. The compressor will stop
and considered trip.
If the compressor discharge temperature < 90°C , the compressor frequency will be reset based on the OD
ambient, set and room temperature.
2.19 Oil Recovery Control (Applicable for ARXN/RXN50/60L)
When the compressor operates for certain duration at low frequency, the oil level in the compressor may
become low due to incomplete oil return.
To prevent damage to the compressor or compressor lock due to low oil lever.
To promote refrigerant fl ow to carry the oil back to the compressor.
Entering condition:
• Compressor rotation < 35 Hz, at the end of a 20 minutes timer: set lower limit rotation to 35 Hz & EXV
opening is fi xed at current opening + 50 pulse. This control is reset when rotation > 35 Hz.
21
Stop zone
Drop zone
Frequency
keep zone
Reset zone
99°C
90°C