MAHLE RTI RRC750X User Manual

OPERATION

&

MAINTENANCE

MANUAL

RR750X

RTI Technologies, Inc.

York, PA 17402

800-468-2321

P/N 035-80052-01

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!! TABLE OF CONTENTS !!

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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

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

Refrigerant Technologies, Inc.

The RR750X should not be operated or maintained by any person who has not read all the contents
of this manual. Failure to read and comply with these instructions or any one of the limitations noted
herein can result in serious injury and/or property damage.

These general instructions deal with the normal operation and maintenance situations encountered
with the RR750X. The instructions should not be interpreted to anticipate every possible
contingency.

It is the responsibility of the owner/user to operate the RR750X in accordance with all specifications
and laws which may apply.

The following pages contain rules for safe operation of the RR750X. Taking precedence over any
specified rule listed herein, however, is the most important rule of all:

"USE COMMON SENSE".

A few minutes spent reading these instructions can make an operator aware of dangerous practices
to avoid and precautions to take for his own safety and the safety of others.

A regular schedule of inspection of the RR750X should be established and records maintained with
special attention given to hoses and replaceable filters.

May 24, 1993 Page 2

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.
! Use the RR750X in locations with mechanical ventilation that provides at least four air changes

per hour or locate the unit 18 inches above the floor.

! Service hoses used with the RR750X must have shutoff devices within 12 inches of the

connection point to the system being serviced to minimize the introduction of non-condensable
gases into the recovery unit and the release of refrigerant when being disconnected.

! Disconnect power before performing any maintenance or service on the RR750X.
! Avoid using an extension cord with the RR750X. If necessary, use a good condition, UL listed,

3-wire grounded, #14 AWG extension cord of the shortest possible length.

! Do not introduce refrigerant in the liquid state into the RR750X from any source having greater

than a 4.5 lb. capacity. Steady introduction of large amounts of liquid refrigerant may cause the
RR750X to malfunction.

! Connect RR750X to grounded and protected 115 VAC - 60 HZ power source.
! Recover R-12 refrigerant only.

May 24, 1993 Page 3

PREPARATION FOR USE

Figure 1 Hose Connections

Refrigerant Technologies, Inc.

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:

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. Over tightening may cause damage to the fittings or valves
and result in leaks.

It is recommended that ALL connections be checked with an electronic leak detector each time hoses
are reconnected.

RECYCLE OPERATION

Set valves on the RR750X as follows in preparation for performing a Recover/Recycle operation:

! Red Valve on External Cylinder OPEN (Counter-clockwise)
! Blue Valve on External Cylinder OPEN (Counter-clockwise)
! Ball Valve on Red Hose OPEN (Handle parallel to hose)
! Ball Valve on Blue Hose OPEN (Handle parallel to hose)
! Yellow Filter Bypass Valve OFF (Handle vertical)

May 24, 1993 Page 4

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).

NOTE: It is recommended that the High and Low Gauge Manifold Hoses have shut-off devices

within 12 in. of the ends connected to the vehicle A/C system. This will permit the
recovery of refrigerant from the hoses.

The yellow Service Hose could be connected directly to the low side of the A/C System
and the RR750X Inlet Pressure Gauge used to monitor pressure.

Turn the Main Power Switch to On.

The Ready Light and Compressor-On light will illuminate. The Compressor High Pressure Light
will flash momentarily. The Compressor and Condenser Fan will be heard operating as refrigerant
is recovered from the vehicle.

NOTE: Several audible changes may be heard during the recovery process. The oil

re-circulation and non-condensable gas venting circuits will cycle
periodically.

Refrigerant flow through check valves causes a "sizzle-type" sound.

These changing "noises are normal and nothing to be concerned

about.

The RR750X will recover refrigerant from the A/C system. The Compressor-On Light will then turn
off.

!!!! DO NOT TURN THE RR750X OFF OR DISCONNECT HOSES !!!!

A small quantity of Liquid refrigerant will probably remain in the A/C system of the vehicle. This
liquid will vaporize as the system components again warm to ambient temperature. This can be
detected by noticing an increase in pressure readings on the Gauge Manifold.

May 24, 1993 Page 5