Sanyo CHDX09663, CHDXR07263, CHDXR09663, CHDX07263 service manual Unit

5. Recovering Refrigerant

W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures

(2) If the remote controller (RCS-TM80BG) is not available for maintenance of the outdoor unit

1Determine the outdoor unit where the unit No. setting (S007) (3P DIP switch) (Blue) on the outdoor unit control PCB is set to No. 1.

2Short-circuit the test-run pin (CN023) on the PCB to start test run operation.

3Leave the unit running for a while, and touch the gas tubing with fingers to determine whether the unit is running in cooling or heating mode.

If it is in heating, follow the step 4 and later procedures.

Cooling : low temperature (68 °F or lower)

Heating : high temperature (140 °F or higher)

CAUTION

The gas tubing becomes hot (140 °F or higher) in heating mode. Be careful so as not to be burnt when touching the tubing.

4Release the short-circuit at the test-run pin (CN023) on the outdoor unit control PCB of the No. 1 unit. Then

short-circuit the stop pin (CN104) to stop operation. 2

5Short-circuit the mode-change pin (CN101) on the outdoor unit control PCB of the No. 1 unit.

* Switching of the 4-way valve occurs immediately before operation starts. Therefore it does not change at this time. (Mode change cannot be judged from the sound.)

6Short-circuit the test-run pin (CN023) on the PCB to start test run operation. Leave the unit running for a while, and touch the gas tubing with fingers to determine that the unit is running in cooling mode.

5-2-2. Refrigerant recovery procedures (1) (using indoor unit ball valve)

(1)If a ball valve with a service port has been provided in the indoor unit as shown in Fig. 10, follow the instructions given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instructions in “5-2-3. Refrigerant recovery procedures (2).”

(2)After running the unit in Cooling mode for about 5 minutes as described in “5-2-1. Cooling operation (for all units),” fully close the liquid tube ball valve.

(3)Run the unit in Cooling mode for 10 to 20 minutes more.

(4)Fully close the gas tube ball valve, and stop the operation of all units.

(5)Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder with each other. (Fig. 10)Do each connection quickly to prevent air from entering the tubing.

CAUTION

Remaining refrigerant may create internal pressure, therefore care should be taken when connecting the hoses.

(6) Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit.

NOTE

To determine completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

Manifold

gauge

Lo Hi

							Refrigerant
							recovery
								unit
		Refrigerant recovery				cylinder
								hased)
			Ball	valv	e (separately purc
	Ga		s tube
					Service port
	Outdoor
			unit
			side
Liquid tube
								Fig. 10

Indoor unit

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