Sanyo CHDX07263, CHDXR07263, CHDXR09663, CHDX09663 service manual Other Controls, Oil Control

5. Other Controls

W-2WAY ECO-i SYSTEM Control Functions

5-1. Oil Control

5-1-1. Oil level

	Oil level	Meaning	Conditions of oil	Judgement
			The compressor contains oil more than	There is no problem.
	2	Sufficient	the oil level which is necessary and
1			sufficient for normal operation.
			The compressor contains sufficient oil	Confirm that oil is returned after
	1	Slightly low	but there is a possibility of shortage	performing the oil control operation.
			against the required oil level.
			The compressor oil is short against	Confirm that oil level is recovered to the
	0	Extremely low	the required oil level sufficient for normal	required level after performing the oil
			operation.	recovery control between systems.

At the time immediately after the oil level changes from 2 to 1, there is a specified amount of oil in the compressor. Namely, soon after the oil level is changed to 1, the oil in the compressor is not empty. If the oil level “0” indication continues for more than 5 to 10 minutes, it seems short of oil in the system. Check for any oil leakage as well as the refrigerant tubing.

5-1-2. Oil level detection

Excess oil in the compressor is sent by bypass via a capillary tube to the low-pressure circuit. The temperature detected by a temperature sensor is used to determine whether it is oil (warm) or refrigerant (cold).

5-1-3. Self-separator oil recovery control

*When a low oil level is detected, this control recovers the oil which has accumulated in that oil separator and sends it to the compressor.

(1)Operation when oil level is not 2.

30 seconds after the oil level changes from 2 to 1, the recovery valves turn ON. However, if the oil level becomes 2, this control is stopped.

5-1-4. Unit refrigerant oil recovery control – utilizing balance tubes

*If the low oil level continues, that outdoor unit (oil-receiving outdoor unit) receives a supply of oil from operating outdoor units where the oil level is not low (oil-supply outdoor units).

(1)Control at the oil-supply outdoor unit begins 3 minutes after the oil level at the outdoor unit dose not become 2. Oil supply is performed for a maximum of 5 minutes from each unit.

(2)When oil supply is ended, oil supply from that outdoor unit will not occur again for a period of [(No. of outdoor units minus1) x 5 minutes]. In addition, oil supply is ended if the oil-receiving outdoor unit oil level changes to 2, or if the oil-supply outdoor unit oil level becomes low.

(3)The supply of oil is received from 1 unit at a time, in sequence, according to the order of priority of their inverter compressors.

(4)Operation during unit refrigerant oil recovery

(A) Oil-receiving outdoor unit

The recovery valve turns ON and remains ON.

(B) Oil-supply outdoor unit

The balance valve turns ON and remains ON.

The bypass valve repeatedly turns ON and OFF according to a constant cycle.

5-1-5. Indoor unit refrigerant oil self-recovery control

Refer to the items concerned with indoor unit special control.

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