Sanyo CHDX07263, CHDXR07263 Defrost Control, Refrigerant Oil Recovery Control between Systems

4. Special Controls

W-2WAY ECO-i SYSTEM Control Functions

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

1			Control time	Maximum 3 minutes (Stops once before and once after control.)
			Outdoor units	All outdoor units operate at maximum horsepower.
			Electronic Thermostat	Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity.
			Expansion Valve
		Indoor
			RAP valve kit	Valve kits at all indoor units operate in Cooling mode (OFF status.)
		units
	Fan		Fan operates at the set fan speed, or stops depending on the operation mode of the
				indoor unit.
	(3) Heating cycle
			Control time	Maximum 3 minutes (Stops once before and once after control.)
			Outdoor units	All outdoor units operate at maximum horsepower.
			Electronic Thermostat	Valves at all indoor units operate at 480 pulse.
			Expansion Valve
		Indoor
			RAP valve kit	Valve kits at all indoor units operate in Heating mode (ON status.)
		units
			Fan	Fan operates at the set fan speed, stops or operates at a very low speed.

4-3. Defrost Control

4-3-1. Defrost Methods

This system uses the following 2 defrosting systems.

System employs

Defrost control method

1 outdoor unit in the refrigerant system

Reverse cycle defrost

2 outdoor units in the refrigerant system

Outdoor unit cycle defrost

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.

1 - 10