Daikin FTXN25L - Oil Recovery Control (Applicable for ARXN,RXN50;60 L); Overall Current Control

Algorithm & Control
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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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xed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)
L1
L2
L3
Stop zone
Reset zone
Frequency
reduce zone
Frequency
remain zone
Model L1
RXN25/35L
ARXN25/35L
14.0A
RXN25M/N
ARXN25M/N
RXK25A
RXC25A
9.5A
RXN35M/N
ARXN35M/N
RXK35A
RXC35A
10.0A
ARXN50/60L
RXB50/60A
12.0A
RXN50/60L/M/N
ARXN50/60M/N
RXK50/60A
RXB50/60B/C
ARXB50/60C
RXC50/60A
16.0A
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.