ROBINAIR AC1234-4 Recover, Recycle, Recharge Machine Instruction Manual

ROBINAIR AC1234-4 Recover, Recycle, Recharge Machine

Model AC1234-4

Replace the Oxygen Sensor in the Refrigerant Identifier

The refrigerant identifier in the machine contains a replaceable oxygen sensor that can affect the way the machine works if the sensor is not functioning correctly.

• If the machine displays the following message, immediately replace the oxygen sensor
  

• OPERATING TIME OF THE IDENTIFIER AND UNIT ARE LIMITED

• REPLACE ID O2 SENSOR SOON UNIT WILL BECOME NONFUNCTIONAL

• If the machine displays the following message, the oxygen sensor has expired. Neither the identifier nor the machine is able to recover or add refrigerant to the internal tank

• ANALYZER ERROR 6 O2 SENSOR FAILURE SENSOR MUST BE REPLACED UNIT WILL NOT RECOVER OR ALLOW TANK FILL SEE MANUAL

Replacement Procedure

1. Disconnect the machine from its power source.
2. Remove the oil bottle, and remove the four screws holding the shroud. See Figure 13. Hang the shroud on the back of the machine.
3. Disconnect the wire harness, USB connector, and sample hose from the identifier. See Figure 14.
4. Remove the two screws holding the identifier to the machine, and remove the identifier.
5. Carefully pry the oxygen sensor cap from the housing. Gently pull on the cap and wires until the connector exits the housing.

CAUTION : The wire connected to the cap is connected internally to the identifier. To prevent equipment damage, do NOT pull on this wire

Maintenance

• Disconnect the wire harness at the connector by pressing on the center tab. Pull the connectors apart. See Figure 15.
• Move the cap and harness aside. Hold the lead from the sensor, and use a flat-blade screwdriver to unthread and remove the oxygen sensor. See Figure 16.
• Remove the pink protective film from the threaded end of the new oxygen sensor.
• Install the new oxygen sensor, using the screwdriver to thread it into place. Tighten the sensor to 4 in. lb.
• Reconnect the lead at the connector, and tuck the wires into the opening.
• Replace the cap and push until it “clicks” into place. Install the identifier onto the machine, and reconnect the wire harness, USB connector, and sample hose.
• Verify the wiring is not binding, and replace the shroud

Refrigerant Identifier

The refrigerant identifier samples refrigerant going into the ISV to verify that it is R1234yf and not contaminated. Replace the sample hose assembly during every filter change and also if prompted by an error message saying that the hose is clogged. See Figure 17.

1. Disconnect the existing sample hose assembly between the solenoid and the refrigerant identifier, and install a new sample hose assembly.
   Note : If the filter is any color but white, the filter needs to be replaced also.

2. Pull th filter out of the brackets while removing the barbs from the rubber connectors.

3. Install a new filter with the arrow pointing upward as shown. Push the filter barbs into the rubber connectors.

4. Install the shroud on the machine and with the power ON

Replace Service Hoses and/or Service Couplers Ensure pressure has been removed from service hoses before disconnecting a hose or coupler from the machine. Pressure gauges must read at or below 0 psig.
If pressure exists, recover the refrigerant from the hoses before disconnecting a hose or coupler.

1. The machine performs a 30-second vacuum to ensure hoses are empty.
2. The machine displays
3. Disconnect old hoses and replace with new hoses
4. Press OK to continue
5. Press ESC to exit
6. Remove and replace old service hoses. Press OK.
7. The unit directs the user to connect hoses to the storage ports and press OK to begin unit conditioning.
8. A vacuum is performed on the unit until excess air has been removed from the service hoses.
9. The machine is now ready to use.

Tank Fill Hose Filter Service

The tank fill hose at the rear of the machine (see Figure 18) contains a filter that can be cleaned when it appears that refrigerant flow is restricted.

When the machine senses low flow, it can display one of the following messages:

• SOURCE TANK EMPTY, but the source tank is known to contain refrigerant, connections are secure, and the source tank valve is open.
• REPLACE IDENTIFIER FILTER, but the refrigerant identifier filter is known to be unrestricted, the source tank contains refrigerant, connections are secure, and the source tank valve is open.
• The tank fill hose filter might be plugged.

Cleaning the Tank Fill Hose Filter

1. First, ensure that pressure does not exist in the line. Disconnect the external source tank, and perform a manual tank fill to capture any refrigerant in the line.

2. Disassemble the tank fill hose at the filter housing as shown in Figure 19.

3. Remove the filter. The recommended method to remove debris from the filter is by using air pressure.
   Note : If a solvent is used, allow adequate drying time before reassembly.

4. After the filter has been installed back into the filter housing, torque the housing assembly to 8.5 N•m (6 ft. lb.).

Replacement Parts

Contact Robinair Customer Service (1-800-533-6127) for more information regarding the replacement parts listed here

WARNING : To prevent personal injury, use only those repair parts called out in this parts list. Items found in this parts list have been carefully tested and selected by Robinair.

Glossary

• A/C System: The vehicle air conditioning system being serviced.
• Evacuation: Moisture and other non-condensable are removed from an A/C system by a vacuum pump.
• Internal Storage Vessel (ISV) : The refillable refrigerant storage tank designed specifically for this machine; a 9.5 kg (20.94 lb) capacity.
• Leak Test (Vacuum) : Components containing refrigerant are evacuated and monitored for pressure rise, which could indicate a leak.
• Machine: Model No. AC1234-4.
• Leak Check: Components containing refrigerant are pressurized and monitored for pressure decay, which could indicate a leak.
• Recovery / Recycling : Refrigerant is recovered from an A/C system, filtered, and stored in the ISV.
• Refrigerant : R1234yf

ROBINAIR.COM 800.533.6127

References

• Stay connected with a touch | Robinair

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