Oil Recovery Control (Applicable For Arxn,Rxn50/60L); Overall Current Control - Daikin FTXN25L Service Manual

2.21 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 level.
To promote refrigerant flow 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 fixed at current opening + 50 pulse. This control is reset when rotation > 35 Hz. (2.22 Overall
Current Control)

2.22 Overall Current Control

To monitor the overall current and to restrict the compressor upper limit rotation in order to prevent circuit
breakers from exceeding the rated capacity.
Detected during compressor running.
Current (A)
Stop zone
L1
Frequency
reduce zone
L2
Frequency
remain zone
L3
Reset zone
When the input current for running compressor exceeds L2, the running frequency will be reduced by 1 step.
If the current still exceeds L2, frequency will be reduced by another step until total current falls between L2
and L3.
This protection cuts in when the input current exceeds L1 for 2 seconds. Compressor will stop and it is
considered total current overload.
If input current < L3, the compressor frequency is reset based on the outdoor ambient, set and room
temperature.
Model
RXN25/35L
ARXN25/35L
RXN25M/N
ARXN25M/N
RXK25A
RXC25A
RXN35M/N
ARXN35M/N
RXK35A
RXC35A
ARXN50/60L
RXB50/60A
RXN50/60L/M/N
ARXN50/60M/N
RXK50/60A
RXB50/60B/C
ARXB50/60C
RXC50/60A
Algorithm & Control
L1
14.0A
9.5A
10.0A
12.0A
16.0A
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