OPERATION & MAINTENANCE MANUAL RR750X RTI Technologies, Inc.
!! TABLE OF CONTENTS !! RR750X Before Using Page 2 Safety Precautions Page 3 Preparation For Use Page 4 Recycle Operation Page 4 Charging Capability Page 6 How The RR750X Works Page 9 Scheduled Maintenance Page 12 Problems & Solutions Page 14 Flow Diagram Page 15 Circuit Diagram Page 16 Wiring Diagram Page 17
Refrigerant Technologies, Inc. BEFORE USING THE RR750X Check for any shipping damage. If damaged, place a claim with carrier. DO NOT USE A DAMAGED UNIT. Verify that you have received the following: RR750X Machine Eight Foot Refrigerant Hose (Qty=2) Tee Fitting Oil Syringe Oil Drain Cup DOT Approved Cylinder The RR750X should not be operated or maintained by any person who has not read all the contents of this manual.
Refrigerant Technologies, Inc. SAFETY PRECAUTIONS ! Wear safety glasses and protective gloves. Refrigerant has a very low boiling point and can cause frostbite. ! Follow the RR750X operating procedures sequentially to avoid prematurely disconnecting hoses or opening valves which may release refrigerant to the atmosphere. ! Do not expose the RR750X to moisture or operate in wet areas.
Refrigerant Technologies, Inc. PREPARATION FOR USE Place the External Cylinder on the Weight Scale Platform on the rear of the RR750X. Connect the four hoses to the External Cylinder as shown in Figure 1. NOTE: Figure 1 Hose Connections Color standards for cylinder valve knobs were changed by the manufacturer during 1992. Therefore, do not depend on color to indicate liquid or vapor valves on the External Cylinder. Look for “LIQUID” or “VAPOR” embossed on the knobs. Tighten fittings FINGER-TIGHT only.
Refrigerant Technologies, Inc. Connect one end of the 8 Ft. yellow hose to the Inlet Port of the RR750X. Connect the other end to the center port of a Gauge Manifold. The hose can also be connected directly to the low side of the vehicle A/C system. The Pressure Gauge on the RR750X can then be used to monitor pressure. If using a Gauge Manifold, connect it to the A/C system as specified by the manufacturer of the vehicle. Open the Gauge Manifold Valves (Counter-clock-wise).
Refrigerant Technologies, Inc. If the pressure increases to a preset level, the RR750X will again start to recover refrigerant. The Compressor will turn on and the Compressor-On Light will illuminate. Allow this sequence to repeat until the Compressor-On Light remains off continuously for 2 minutes. Close the valves on the 8 Ft. hose and the Gauge Manifold. Turn the Main Power Switch to OFF.
Refrigerant Technologies, Inc. The Charging Cylinder or Auxiliary Tank can now be filled and used to charge the A/C System according to the Manufacturer’s instructions. A pressure differential is required to encourage flow of refrigerant into the A/C System. Some Charging Cylinders have a heating element for the purpose of creating this differential in pressures. Mild heating of the Auxiliary Tank will develop this pressure differential. Immersion in warm water is the least risky method. ... CAUTION ...
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Refrigerant Technologies, Inc. HOW THE RR750X RECOVERS & RECYCLES REFRIGERANT Following is a description of the purpose and performance characteristics of the components within the RR750X. The items are discussed in the order as seen by refrigerant as it flows through the unit from the Inlet Port to the External Cylinder. Refer to the Flow Diagram and Circuit Diagram in the Appendix. INLET PRESSURE GAUGE Indicates pressure of refrigerant at the Inlet Port of the RR750X.
Refrigerant Technologies, Inc. Refrigerants react with water to form hydrochloric and hydrofluoric acids which are corrosive to equipment and contaminate oil. Removal of acid at this stage is important to protect the Compressor and other RR750X components. The Acid Filter must be replaced after every 500 hours of operation. CHECK VALVE (1 PSI) The Check Valve permits forward refrigerant flow when the output pressure from the Acid Filter is 1 lb.
Refrigerant Technologies, Inc. HIGH PRESSURE SWITCH The High Pressure Switch opens-on-rise at a pressure of 261 ± 7 PSIG and closes on-fall at 203 ± 7 PSIG. The Compressor turns off and Solenoid Valve S11 closes to prevent flow of refrigerant through the system. OIL SEPARATOR Filtering of the refrigerant to remove oil is accomplished by a fine composition filter element.
Refrigerant Technologies, Inc. SCHEDULED MAINTENANCE DAILY BEFORE USE... Check the oil level in the Compressor daily before operating the RR750X. The oil level tube can be seen next to the Compressor by looking through the vent openings on the side of the RR750X nearest the Main Power Switch. Oil should be visible in the clear tube, but at a level less than one inch. If the oil level is not visible, proceed with the Recover/Reclaim operation and recheck the oil level when complete.
Refrigerant Technologies, Inc. USE CAUTION TO NOT MOVE CONNECTING TUBES AS LEAKS COULD DEVELOP ! Turn off Filter By-pass Valve by turning yellow handle on rear of cabinet to VERTICAL position. ! Operate the RR750X in Recover Mode and check for leaks. Repair as necessary. ! Record Hour Meter reading on label provided. Replace the Filter-drier cover. AFTER EVERY 500 HOURS OF OPERATION Replace Acid Filter as described in the following steps: ! Cap the RR750X Inlet Port.
Refrigerant Technologies, Inc. PROBLEMS & SOLUTIONS On rare occasion the RR750X may seem to be performing differently or not at all. Experience has shown that varying operating conditions can affect the performance characteristics of the RR750X. The temperature of the vehicle A/C System will affect how the RR750X performs. Following are typical problems with explanations of the possible cause and solution. PROBLEM: My RR750X worked fine all last Summer.
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Refrigerant Technologies, Inc.
Refrigerant Technologies, Inc.
