MAHLE RTI RHS780 User Manual

OPERATION

&

MAINTENANCE

MANUAL

RHS780

Refrigerant Handling Station

RTI Technologies, Inc.

4075 E. Market St., P.O. Box 3099

York, PA (USA) 17402

800-468-2321 (Ext. 259)

http://www.rtitech.com

[e-mail]

Manual P/N 035-80591-00

TABLE OF CONTENTS

RHS780

Before Using the RHS780 .................... 2

Safety Precautions .......................... 2

Using the RHS780 .......................... 3

Setup .................................... 4

Filling the Charge Cylinder ................... 5

Recover/Recycle ........................... 6

Draining Recovered Oil ...................... 7

Deep Vacuum ............................. 8

Charging ................................. 9

Automatic ................................. 10

Accessing Stored Data ....................... 12

Setting Over Charge Amount .................. 13

Scheduled Maintenance & Filter Maintenance .... 14

CONGRATULATIONS:

You have purchased one of the finest Recovery, Recycling, and Charging Machines available!
Fill out and return the Warranty Card within 90 days to activate warranty and free lifetime

technical support.

BEFORE USING THE RHS780

Check for any shipping damage. Place a claim with carrier if damage is discovered. DO NOT USE A DAMAGED UNIT.

Complete and return the Warranty Card to activate technical support service and warranty coverage.

These general instructions describe normal operation and maintenance situations encountered with the RHS780. 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.

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. The instructions should not be interpreted to anticipate
every possible contingency.

The RHS780 should not be operated or serviced by any person who has not read all the contents of this manual.

It is the responsibility of the owner/user to operate the RHS780 in accordance with all specifications and laws which may
apply.

A regular schedule of inspection of the RHS780 should be established and records maintained with special attention
given to Hoses, Compressor Oil Level, Vacuum Pump Oil Level, and Filters.

SAFETY PRECAUTIONS

Recover, Recycle, and Charge only the refrigerant for which the machine is configured.

Wear safety glasses and protective gloves. Refrigerant has a very low boiling point and can cause frostbite.

Follow the RHS780 operating procedures sequentially to avoid prematurely disconnecting hoses or opening valves which
may release refrigerant to the atmosphere.

Do not expose the RHS780 to moisture or operate in wet areas.

Use the RHS780 in locations with mechanical ventilation that provides at least four air changes per hour.

Hoses used with the RHS780 must have shutoff devices within 12 inches (30 centimeters) of the connection point to the
A/C System to minimize the introduction of Non-Condensable Gas (Air) into the RHS780 and the release of refrigerant
when being disconnected.

Disconnect power before performing any maintenance or service on the RHS780.

Connect the RHS780 to a properly grounded receptacle. Do not over load the circuit.

Avoid using an extension cord with the RHS780. If necessary use a good condition three wire, grounded, #14 AWG (2.0
mm2) or larger extension cord of the shortest possible length.

Do not connect the RHS780 to the liquid side of any A/C System with a capacity greater than 4 lbs (1.8 Kg.) Refrigerant
in A/C Systems having larger capacities must be recovered from the vapor side only.

Never connect the Red or Blue Hose on the rear of the RHS780 to the Liquid Port of a Cylinder of Refrigerant to fill the
Charge Cylinder. Doing so may cause the Compressor to fail and void the warranty.

Avoid breathing refrigerant or lubricant vapor or mist. Exposure may irritate eyes, nose and throat. If accidental system
discharge occurs, ventilate work area before continuing.

Additional health and safety information may be obtained from refrigerant and lubricant manufacturers.

Special Considerations with R134a

R134a has been shown to be nonflammable at ambient temperature and atmospheric pressure. However, tests under
controlled conditions have indicated that at pressures above atmospheric and with air concentrations greater than 60
percent by volume, R134a can form combustible mixtures.

While it is recognized that an ignition source is also required for combustion to occur, the presence of combustible
mixtures is a potentially dangerous situation and should be avoided.

Under no circumstances should any equipment be pressure tested or leak tested with Air and R134a mixtures. Do not
use compressed air (shop air) for leak detection in R134a systems.

September 24, 1999 Page 2

USING THE RHS780

external vacuum measuring device. When programmed to do so, the RHS780 will pause and start a “count up” timer

The RHS780 will always go through the Recover/Recycle procedure, but will go immediately to the Recycle Hold Timer

the A/C System is empty. The following matrix outlines the most commonly used options that can be programmed to occur

Note: The purpose of this discussion is to familiarize the user with the features and functions of the RHS780 Refrigerant

Handling Station. The procedures discussed in this manual assume that the RHS780 has been set up in accordance
with the figures which are referred to and that the RHS780 has been connected to the proper power supply. This
manual does not illustrate correct A/C service but rather how to correctly use the RHS780.

The RHS780 is microprocessor controlled with a menu driven user interface. All of the functions of the RHS780 are accessed
by pressing a few simple key strokes and following the prompts. See Page 4 items (2) and (6). The on board Charging
Cylinder is attached to a strain gauge measuring device and the weight is electronically displayed.

The RHS780 has a Fill Cylinder feature that allows refrigerant to be loaded directly into the Charging Cylinder without going
through the normal Recover/Recycle mode. When selected, this feature allows the RHS780 Charging Cylinder to be re-filled
in just a few minutes at which point it will automatically stop at approximately 13 lbs (6 Kg.)

The RHS780 Recovers and Recycles simultaneously in a true “single pass” through the filters and stores the refrigerant in
the Charging Cylinder where it is immediately available for use. This process automatically stop’s at 17.5 lbs (8 Kg) or when
a 15"Hg (-0.5 Bar) vacuum is sensed. The RHS780 will wait for a factory default of two minutes for “out gassing” and cold
refrigerant to raise the pressure back up to 3 psig (0.2 Bar) which would cause the Recover/Recycle process to start again
and reset this two minute Recycle Hold Timer before displaying that the process is complete. The Recycle Hold Timer can
be changed every time a Recover/Recycle procedure is run. Longer times should be selected on colder days or on A/C
Systems with large liquid capacities. Increasing this value may increase total time to Recover/Recycle while decreasing the
time may result in an incomplete Recovery of the A/C System. Refer to the chart below for guidelines on setting the Recycle
Hold Timer. The value entered is stored in the memory of the RHS780 and becomes the “default” value each time it is set.
Non-Condensable Gases are vented automatically during Recovery/Recycle. The Amount of refrigerant Recycled is displayed
at the end of the procedure. This value is added to the Total amount Recycled and stored in the memory of the RHS780 (see
Accessing Stored Data on Page 12.)

Temperature < 50F (10C) 50F (10C) to 80F > 80F (26.5C)
Recycle Hold Time 10 min 5 min 2 min

An integrated 3 CFM (1.4 L/s) rotary vane style Deep Vacuum Pump draws on both the High and Low Hoses, items (13) and
(14), ensuring complete evacuation of the A/C System. The amount of time that the Vacuum Pump has been programmed
to run will “count down” on the display (6). The value entered is stored in the memory of the RHS780 and becomes the
“default” value each time it is set. A special Vacuum Check Gauge (4) mounted between the High (5) and Low (1) Pressure
Gauges can be used to monitor a rise in A/C System pressure. An Auxiliary Vacuum Gauge Port(8) is also provided to attach
an
indicating how long the Vacuum Pump has been off, thus allowing the operator to determine if a vacuum leak is present
based on increasing pressure over time. A rapid rise in pressure indicates the presence of a large leak that should be
repaired. A slow rise in pressure may simply indicate that a longer Recycle Hold Timer or Vacuum Time value should have
been entered. A relatively constant vacuum reading over a long period of time (i.e. less than 2"Hg [0.05 Bar] rise over ten
minutes) is the most accurate way to check for vacuum leaks. The RHS780 can also be programmed to pause to allow oil
to be added, (9) and (16) to the A/C System after vacuuming and prior to Charging.

Charging is done via the on board Charging Cylinder. The A/C Capacity is entered via the Keypad (2). The value entered
is stored in the memory of the RHS780 and becomes the “default” value each time it is set. The RHS780 can dispense liquid
refrigerant through either the High (14) or Low (13) Side Hose by changing the position of a selector switch (10). As refrigerant
leaves the RHS780, the display (6) will show an increasing weight to the programmed charge amount plus a factory set 0.03
Kg (one ounce) Over Charge Amount necessary for compensation of refrigerant loss in the hoses. This Over Charge Amount
can be changed to accommodate different operating conditions (see Setting Over Charge Amount [only] on Page 13.) An
integrated Heater automatically engages whenever Charging occurs. The Amount of refrigerant Charged is added to the Total
amount Charged and stored in the memory of the RHS780 (see Accessing Stored Data on Page 12.)

The RHS780 can be programmed to perform the Recover/Recycle, Deep Vacuum and Charge in a completely Automatic
mode.
if
after the Recycle Hold Timer “times out”:

Recover/Recycle X X X X X X X X
Deep Vacuum X X X X X X
Vacuum Leak X X X
Add Oil X X
Charging X X X X X

September 24, 1999 Page 3

SETUP

(1) Low Pressure Gauge (2) Keypad (3) Main Power Switch (4) Vacuum Check Gauge (5) High Pressure Gauge

(6) Display (7) Attention Light (8) Auxiliary Vacuum Gauge Port (9) Oil Charge Bottle {Low Side}

(10) High-Low Charge Selector Switch (11) Fill Port (12) Yellow Hose with Anti-Blowback Valve

(13) Blue Hose {Low Side} (14) Red Hose {High Side} (15) Refrigerant Cylinder (16) Oil Charge Bottle {High Side}

(17) Oil Drain Re-pressurization Switch (18) Oil Drain Valve (19) Measuring Cup

September 24, 1999 Page 4