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4. Special Controls
4-2-3. Refrigerant Oil Recovery Control between Systems
(1) Simplified flow of system refrigerant oil recovery control
Refrigerant oil recovery control between systems shall be performed as the flow mentioned below.
Normal operation → 3-minute stop → Refrigerant oil recovery control between systems (Max. 3 minutes) → 3-
minute stop → Normal operation
(2) Cooling cycle
Control time
1
Outdoor units
Electronic Thermostat
Expansion Valve
Indoor
RAP valve kit
units
(3) Heating cycle
Control time
Outdoor units
Electronic Thermostat
Expansion Valve
Indoor
RAP valve kit
units
4-3. Defrost Control
4-3-1. Defrost Methods
This system uses the following 2 defrosting systems.
System employs
1 outdoor unit in the refrigerant system
2 or more outdoor units
in the refrigerant system
4-3-2. Constraint conditions
(1) Frost detection does not occur for 5 minutes after operation starts.
(2) Defrost does not begin again for 35 minutes of A/C operation after defrost was once completed.
(3) If all indoor units are stopped while defrost control is in effect, or if the outdoor unit is stopped due to protection
control or another reason, then defrost control will not start for a minimum of 10 minutes after restart occurs.
Maximum 3 minutes (Stops once before and once after control.)
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity.
Valve kits at all indoor units operate in Cooling mode (OFF status.)
Fan operates at the set fan speed, or stops depending on the operation mode of the
Fan
indoor unit.
Maximum 3 minutes (Stops once before and once after control.)
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at 480 pulse.
Valve kits at all indoor units operate in Heating mode (ON status.)
Fan operates at the set fan speed, stops or operates at a very low speed.
Fan
Reverse cycle defrost
Outdoor unit cycle defrost
Defrost control method
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W-2WAY ECO-i SYSTEM
Control Functions
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