311B, 312B, 315B, 320B, 322B, 325B and 330B Excavators Air Conditioning and Heating Refrigerant Recovery Caterpillar


Refrigerant Recovery
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------ WARNING! ------

Personal injury can result from contact with refrigerant.

This system is under pressure at all times, even if the engine is not running. Heat should never be applied to a charged system.

Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.

Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.

Always use caution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, evacuate the system recovering the refrigerant before removing the fitting.

Personal injury or death can result from inhaling refrigerant through a lit cigarette.

Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.

Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.

Before any checks of the air conditioning and heating system are made, move the machine to a smooth horizontal surface. Lower all implements to the ground. Make sure the transmission is in neutral or park and that the parking brake is engaged. Keep all other personnel away from the machine or where they can be seen.

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Illustration 1g00438523

(1) Low-pressure valve

(2) High-pressure valve

(3) Charging hose

(4) Low-pressure hose

(5) High-pressure hose

(6) Manifold gauge set

(7) Control panel

(8) Inlet on recovery station

(9) Accumulator/oil separator

(10) Drain valve

(11) Pressure valve on accumulator

(12) Compressor

(13) Refrigerant tank

(14) Hose (liquid)

(15) Hose (vapor)

(16) Refrigerant pump

(17) Filter dryer

(18) Scale for measuring refrigerant

(A) Low-pressure side (suction)

(B) High-pressure side (discharge)

(C) Refrigerant compressor


NOTICE

All AVSpare air conditioning systems built since January 1, 1994 use only R134a refrigerant. Air conditioning systems built prior to January 1, 1994 require either R134a or R12. Use of incorrect refrigerant will cause air conditioning system failure. In order to identify the refrigerant type correctly, see identification plate on the refrigerant compressor. Machines that have been retrofitted to R134a refrigerant also have an identification plate on the refrigerant compressor.


If service work on the air conditioning system is required, the refrigerant must be recovered before components are removed and before components are installed.

One exception exists. Many in-line dryers have quick couplers. Refer to the Operation and Maintenance Manual, "In-Line Refrigerant Dryer - Check/Replace" for the proper procedures.

Use the following procedure for recovering the refrigerant in all other situations.

  1. Install the manifold gauge set (6). Make sure that both valves are closed. Turn the valves clockwise in order to close the valves. Refer to Testing and Adjusting, "Manifold Gauge Set (Refrigerant) - Install" for proper instruction.

  1. Attach charging hose (3) of the manifold gauge set to inlet (8) on the refrigerant service unit.

  1. Slowly open valves (1) and (2) in order to release the air from the charging hose. Ensure that the valves on refrigerant tank (13) are open. One valve is for vapor and the other valve is for liquid. Put a clean cloth over the charging hose fitting. The fitting is connected loosely at the air conditioning charging port. The cloth will prevent a spray of compressor oil. Open the low-pressure valve on the gauge set about 1/2 turn. Keep the valve open for 2 to 3 seconds in order to flush air from the gauge set. Close the low-pressure valve on the gauge set. Repeat this process for the high-pressure valve. At the air conditioning charging port, tighten the charging hose fitting.

    Note: Use the refrigerant identifier. The refrigerant identifier will prevent refrigerants that are not R134a from contaminating the recovery and charging tools.

  1. Plug the refrigerant service unit into an electrical outlet and turn the power switch ON. This switch is located on control panel (7) .

  1. Press the "Compressor Start"of the refrigerant service unit. The amber "Compressor On" light will come on and compressor (12) will start. The compressor will automatically shut off when the recovery of refrigerant is complete.

  1. After recovering a system, if the system pressure rises above 0 kPa (0 psi) within 5 minutes, the system must be recovered again. After recovering a system, if the system accumulator remains cold, the system must be recovered again. Repeat the recovery process until the pressure does not increase. The recovery process will empty the machine system accumulator of refrigerant. Now, the accumulator will be at ambient temperature.

  1. Drain the refrigerant oil from the accumulator (9) of the refrigerant service unit. On the refrigerant service unit, open accumulator pressurizing valve (11) long enough so that some discharge from the compressor can flow back to the accumulator. Open oil drain valve (10) slowly and drain the oil into a measuring cup. Do not allow a complete loss of pressure in the accumulator/oil separator. When the oil stops draining, close oil drain valve (10) .

  1. If 15 CC (.5 ounces) or more of compressor oil was lost during the recovery process, new oil must be added to the system. Refer to Testing and Adjusting, "Refrigerant Compressor Oil - Check" for further information.

    Note: Do not use the scale in order to determine the amount of refrigerant that is removed from the system. Inaccuracy up to 30% may result. Only use the scale for charging the system. Recalibrate the scale after 30 days. If you use the scale frequently, recalibrate the scale after 30 uses.

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