Table of Contents
6. Oil Control
7. Oil Control
(1) Self-separator Oil Recovery Control
Oil is recovered from the oil separator to the compressor through the ORVR.
(2)
System Oil Recovery Control
All indoor units MOV are opened for recovering oil from indoor side to compressor.
2-1.
Start of system oil recovery control
Amount of oil in the compressor is presumed from operation condition. If presumed oil shortage, system oil
recovery control start.
This control is performed every 30 minutes - 5 hours.
2-2.
Simplified flow of system oil recovery control
The system oil recovery control shall be performed as the flow mentioned below.
Normal operation → System oil recovery control → Normal operation
In the case of cooling mode
Control time
Outdoor units
MOV
Indoor units
RAP valve kit
Fan
In the case of heating mode
Control time
Outdoor units
MOV
Indoor units
RAP valve kit
Fan
For max 3 minutes
All outdoor units operate at maximum horsepower.
MOV at all indoor units operate at a fixed pulse according to the indoor unit
capacity.
All indoor units operate in Cooling mode (OFF status).
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed "LL".
For 3 minutes
All outdoor units operate at more than half horsepower.
MOV at all indoor units operate at 250 pulses.
All indoor units operate in Heating mode (ON status.)
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed "LL".
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2WAY VRF SYSTEM
Mini VRF SYSTEM
Control Functions
Control Functions - Outdoor unit
1
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