311B, 312B, 315B, 320B, 322B, 325B and 330B Excavators Air Conditioning and Heating Manifold Gauge Set (Refrigerant) - Remove Caterpillar


Manifold Gauge Set (Refrigerant) - Remove
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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.




Illustration 1g00470339
(1) Low pressure valve
(2) High pressure valve
(3) Low pressure hose
(4) High pressure hose
(5) Service valve (low pressure side)
(6) Charging hose
(8) Service valve (high pressure side)
(9) Manifold gauge set
(10) Valve on top of refrigerant tank
(11) Refrigerant tank
(12) Butterfly valve
(18) Scale

You must properly remove the gauge hoses in order to avoid a low charge. A proper charge can be obtained only if the gauge hoses are empty of all refrigerant. Perform the following procedure in order to empty the hoses.

  1. Close the valve on top of refrigerant tank (10).

  2. While the compressor is operating, close the service valve (2) on the high pressure side. Disconnect the high pressure hose (4) from the system at service valve (8). Service valve (8) is on the line that connects the condenser and the compressor.

  3. Open low pressure valve (1) and high pressure valve (2). The compressor will suck the refrigerant in the hoses through low side hose (3). The system is charged.

    Note: After you remove the manifold gauge set, you must cap the service valves.

  4. Close low pressure valve (1). Disconnect low pressure hose (3) from the system at service valve (5).

  5. Disconnect the charging hose (6) from the refrigerant tank (10).

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