MAHLE RTI RHS780 User Manual

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Page 1

OPERATION

MAINTENANCE

MANUAL

RHS780

Refrigerant Handling Station

4075 E. Market Street

P.O. Box 3099

York, PA (USA) 17402

800-468-2321 (Ext. 259)

http://www.rtitech.com

tech@rtitech.com

Manual P/N 035-80829-00 (Rev B)

Page 2

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

Parts Identification .......................... 15

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.

Page 3

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, 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

) 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.

December 9, 2002 Page 2

Page 4

USING THE RHS780

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 20 lbs (9 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 stops at 24 lbs (11 Kg) or when a 15"Hg (-0.5 Bar) vacuum is sensed. The RHS780 will wait for a minimum 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. NonCondensable 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 (26.5C) > 80F (26.5C) Recycle Hold Time 10 min 5 min 2 min

An integrated 7 CFM 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. The Low (1) Pressure Gauge can be used to monitor a rise in A/C System pressure. When programmed to do so, the RHS780 will pause and start a “count up” timer 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. The RHS780 will always go through the Recover/Recycle procedure, but will go immediately to the Recycle Hold Timer if the A/C System is empty. The following matrix outlines the most commonly used options that can be programmed to occur after the Recycle Hold Timer “times out”:

Recover/RecycleXXXXXXXX Deep Vacuum XXXXXX Vacuum Leak X X X Add Oil XX Charging X X X X X

December 9, 2002 Page 3

Page 5

SETUP

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

(6) Display (7) Attention Light (9) Oil Charge Bottle {Mounted on 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 {Mounted on High Side} (17) Oil Drain Re-pressurization Switch (18) Oil Drain Bottle

December 9, 2002 Page 4

Page 6

WEIGHT= XX.X LB

AUTOMATIC

>>>>

WEIGHT= XX.X LB

FILL CYLINDER

ENTER

CHECK HOSES

START

FILLING THE CHARGE CYLINDER

Note: For large capacity or multiple A/C Systems where recharge will NOT

be done between successive recoveries, it may be desirable to skip this procedure.

1. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3) ON.

Note: The RHS780 uses 22 lbs (10 Kg) of refrigerant when Filling the first

time. If the Refrigerant Cylinder (15) is emptied the RHS780 will appear to stop filling (the Weight will stop rising) and will stay in this condition until the RESET key is pressed.

2. Using the Keypad (2), press the “Up Arrow” key four times to display “WEIGHT= XX.X LB” “FILL CYLINDER? The Display (6) will read “CHECK HOSES” “START?

5” and press the ENTER key.

5”.

ENTER

WEIGHT= XX.X LB

COMPRESSOR ON

FILL COMPLETE

FILLED= XX.X LB

ENTER

HIGH PRESSURE

SEE MANUAL

CYLINDER FULL

GO TO CHARGE

3. Open the LIQUID Valve on the Refrigerant Cylinder (15) connected to the Fill Port (11) on the left side of the RHS780 with the Yellow Hose (12).

4. Press the ENTER key when ready to start filling the RHS780.

The Display (6) will read “WEIGHT=XX.X LB” “COMPRESSOR ON”. When the level is approximately 20 lbs (9 kg) the RHS780 will turn OFF, the Display (6) will read “FILL COMPLETE” “FILLED= XX.X LB amount of refrigerant removed from the cylinder) and the Attention Light (7) will turn ON. Close the Liquid Valve on the Refrigerant Cylinder (15).

Note: Press the RESET button on the Keypad to stop the

Fill Cylinder procedure at any time.

5. Press the ENTER key to return to the Main Menu.

* While filling the Charging Cylinder, this screen will display periodically

concurrent with the Attention Light (7) turning ON. This is normal and nothing to be concerned about. The screen should revert to normal after a few seconds.

** This screen will display when the Charging Cylinder fills to capacity,

approximately 24 lbs (11 Kg). If this occurs, the Weight can be lowered using the Charging procedure on Page 9 before the RHS780 can be used to recover more refrigerant. Press the ENTER key to return to the

Note: The RHS780 Charging Cylinder can also be filled from the GAS or

Main Menu.

VAPOR side of a cylinder by following the Recover/Recycle procedure on Page 6.

5” (the

Note: The RHS780 will use 1.1 Lb (0.5 Kg) more refrigerant than the

displayed value the very first time it is used or after performing a Calibration Procedure in order to prime the internal components.

Note: The Yellow Hose (12) can be removed from the Fill Port (11) and

connected to either the Blue (13) {Low side} or Red (14) {High Side} Hose connection port on the rear of the RHS780 to allow recovering the refrigerant left over in the Yellow Hose (12) using the Recover/Recycle procedure on Page 6.

December 9, 2002 Page 5

Page 7

WEIGHT= XX.X LB

AUTOMATIC

WEIGHT= XX.X LB

RECYCLE

ENTER

RECYCLE HOLD

TIME XX MIN

RECOVER/RECYCLE

1. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3)

ON.

2. Attach the Red (14) and Blue (13) Hoses to the A/C System per the vehicle

manufacturer's instructions, open the Red and Blue Hose Valves.

3. Using the Keypad (2), press the “Up Arrow” key one time to display “WEIGHT=

XX.X LB” “RECYCLE? “RECYCLE HOLD” “TIME XX MIN

The Recycle Hold Time is the amount of time that the RHS780 waits for “outgassing” or for the pressure in the A/C System being recovered to rise enough to automatically restart the recovery process. The minimum value is two (02) minutes. The value entered is stored in memory and comes up as the default value the next time the procedure is used.

5” and press the ENTER key. The Display (6) will read

5”.

>< ENTER

CHECK HOSES

START

ENTER

WEIGHT= XX.X LB

COMPRESSOR ON

WEIGHT= XX.X LB

COMPRESSOR OFF

AMOUNT RECYCLED=

XX.X LB

ENTER

DRAIN RECOVERED

OIL NOW!

ENTER

4. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. Press the ENTER key to accept the value. The Display (6) will then read “CHECK HOSES” “START?

5. Press the ENTER key to start recovering and recycling with the RHS780.

The Display (6) will read the “WEIGHT= XX.X LB” “COMPRESSOR ON”. The RHS780 will recover and recycle refrigerant from the A/C System and automatically cycle OFF when a vacuum is sensed. This vacuum level can be seen on the Low (1) Pressure Gauge. The Display (6) will read “WEIGHT= XX.X LB” “COMPRESSOR OFF”

A small quantity of refrigerant will probably remain in the A/C System as observed by an increasing pressure on the Low (1) Pressure Gauge. The RHS780 will automatically cycle ON to continue recovering refrigerant if pressure rises to a preset level. This automatic cycling will repeat resetting the Recycle Hold Timer each time. When the RHS780 remains OFF for the duration of the Recycle Hold Timer value entered in Step 4 the Display (6) will read “AMOUNT RECYCLED=” “XX.X LB

6. Close the Red (14) and Blue (13) Hose Valves and disconnect the hoses from the

A/C System.

7. Press the ENTER key. The Display (6) will read “DRAIN RECOVERED OIL

NOW!”. Drain any recovered oil using the Drain Recovered Oil procedure on Page 7.

8. Press the ENTER key to return to the Main Menu.

* This screen will display if there is an internal fault. Please contact RTI

** This screen will display when the Charging Cylinder fills to capacity,

5” from the A/C System and the Attention Light (7) will turn ON.

Technical Support. Turn the RHS780 Main Power Switch (3) OFF.

approximately 24 lbs (11 Kg.) If this occurs, the Weight can be lowered using the Charging procedure on Page 9 before the RHS780 can be used to recover more refrigerant. Press the ENTER key to return to the Main Menu.

5”.

HIGH PRESSURE

SEE MANUAL

CYLINDER FULL

GO TO CHARGE

December 9, 2002 Page 6

Page 8

DRAINING RECOVERED OIL

Oil is separated from the recovered refrigerant and MUST be removed following EACH Recover/Recycle procedure to determine the amount (if any) necessary to add into the A/C System as follows:

Note: The RHS780 must be connected to power source. Draining Recovered

Oil may be done while the RHS780 Vacuum Pump is ON.

1. Setup the RHS780 as shown on Page 4 and press and hold the Oil Drain Re-

pressurization Switch (17) for 5 seconds and then release it.

2. Slowly open the valve on Oil Drain Bottle (18) to drain any oil which may have

been removed from the A/C System.

Unless the A/C System had previously been overfilled, the RHS780 will typically not remove enough oil to make replenishment necessary.

3. Close the valve on the Oil Drain Bottle (18).

4. Press and hold the Oil Drain Re-pressurization Switch (17) for 5 seconds. This

permits any residual Non-Condensable Gas to be re-circulated for reprocessing during the next recycle procedure.

December 9, 2002 Page 7

Page 9

WEIGHT= XX.X LB

DEEP VACUUM

AUTOMATIC

WEIGHT= XX.X LB

VACUUM

ENTER

A/C HAS PRESSURE

GO TO RECYCLE

ENTER

ENTER VACUUM

TIME XX MIN

>< ENTER

PEFORM LEAK

TEST

Y/N5

< ENTER

1. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3)

ON.

2. Attach the Red (14) and Blue (13) Hoses to the A/C System per the vehicle

manufacturer's instructions and open the Red (14) and Blue (13) Hose Valves.

3. Using the Keypad (2), press the “Up Arrow” key two times to display “WEIGHT=

XX.X LB” “VACUUM? “ENTER VACUUM” “TIME XX MIN

* This screen will display if the RHS780 senses a pressure in either the High (14)

or Low (13) Pressure Hoses. When this occurs, the A/C System must be emptied using the Recover/Recycle procedure on Page 6. Press the ENTER key to return to the Main Menu.

4. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. The value entered must be greater than zero. Press the ENTER key to accept the value. The Display (6) will read “PERFORM LEAK” “TEST? Y/N

5. Press the “Right Arrow” key to move the cursor between Y and N to select

whether or not the RHS780 pauses at the end of Vacuuming so that a vacuum leak can be detected in the A/C System. Press the ENTER key to accept the Yes or No choice. The choice entered is stored in memory and comes up as the default the next time the procedure is used. The Display (6) will read “ADD OIL? Y/N

5”.

6. Press the “Right Arrow” key to move the cursor between Y and N to select

whether or not the RHS780 pauses at the end of Vacuuming (or Vacuum Leak Checking) to allow the Adding of Oil to the A/C System. Press the ENTER key to accept the Yes or No choice. The choice entered is stored in memory and comes up as the default the next time the procedure is used. The Display (6) will read “START?

5”.

5” and press the ENTER key. The Display (6) will read

5”.

ADD OIL

Y/N5

< ENTER

START

ENTER

TIME LEFT=XX MIN

PUMP ON

PUMP OFF XX MIN

CONTINUE

ENTER

ADD OIL NOW

CONTINUE

7. Press the ENTER key to start the Vacuum Pump.

The Vacuum Pump will turn On, the Display (6) will read “TIME LEFT=XX MIN” “PUMP ON” and the minutes remaining will count down on the Display (6). The Vacuum Pump will turn OFF when the Display (6) reads zero minutes.

8. If a Vacuum Leak Check was selected by choosing Y in Step 5 the Display (6) will

read “PUMP OFF XX MIN” “CONTINUE? ON. The elapsed time since the Vacuum Pump turned OFF will count up on the Display (6). An increasing pressure on the Low Pressure Gauge (1) is evidence of a vacuum leak in the A/C System. Press the ENTER key to return to the Main Menu or to Add Oil if selected in Step 6.

9. If Adding Oil was selected by choosing Y in Step 6 the Display (6) will read “ADD

OIL NOW” “CONTINUE? Figure 4 and add oil to the side, either High (16) or Low (9) based on the vehicle manufacturer’s instructions, of the A/C System that will then be Charged during the Charging procedure on Page 9 by opening the valve on the Oil Charge Bottle, (16) or (9), and leaving it open until the correct amount of oil has left the Oil Charge Bottle, (16) or (9). Close the valve on the Oil Charge Bottle, (16) or (9), and press the ENTER key to return to the Main Menu.

5”, and the Attention Light (7) will turn ON. Refer to

5” and the Attention Light (7) will turn

ENTER

December 9, 2002 Page 8

Page 10

WEIGHT= XX.X LB

CHARGING

AUTOMATIC

>>>

WEIGHT= XX.X LB

CHARGE

ENTER

ENTER CHARGE

AMOUNT= XX.X LB

>< ENTER

LOW LEVEL

FILL CYLINDER

ENTER

CHECK HIGH-LOW

CHARGE SWITCH

ENTER

WEIGHT= XX.X LB

GO TO

1. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3)

ON.

2. Attach the Red (14) and Blue (13) Hoses to the A/C System per the vehicle

manufacturer's instructions and open the Red (14) and Blue (13) Hose Valves.

3. Determine the refrigerant capacity of the A/C System to be charged.

Note: 1 oz = 0.02835 Kg & 1 Lb = 0.45359 Kg

4. Using the Keypad (2), press the “Up Arrow” key three times to display “WEIGHT=

XX.X LB” “CHARGE? “ENTER CHARGE” “AMOUNT= XX.X LB

5. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. The value entered must be greater than zero. Press the ENTER key to accept the value. The Display (6) will read “CHECK HIGH-LOW” “CHARGE SWITCH

* This screen will display if the RHS780 Charge Cylinder contains less

refrigerant than the entered value. When this occurs, the charging Cylinder should be filled using the Fill Cylinder procedure on Page 5. Press the ENTER key to return to the Main Menu.

6. Based on the vehicle manufacturer’s instructions, choose Charging through either

Note: Do Not Turn On The A/C System. SAE compliant refrigerant handling

stations, like the RHS780, supply refrigerant in the liquid phase. Adding liquid refrigerant to a running A/C System may cause immediate A/C compressor failure.

7. Press the ENTER key to start charging.

5” and press the ENTER key. The Display (6) will read

5”.

CHARGING

CHARGE COMPLETE

EVAC HOSES

ENTER

The Display (6) will read “WEIGHT= XX.X LB” “CHARGING” as refrigerant leaves the Charging Cylinder. The weight displayed will be increasing from zero to the Charge Amount entered in Step 5 plus a one ounce (0.03 KG) “Over Charge” set at the factory to compensate for hose loss. (See Setting Over Charge Amount [only] on Page 13 to change the default value.) When the RHS780 has finished the Display (6) will read “CHARGE COMPLETE” “EVAC HOSES” and the

Attention Light (7) will turn ON.

8. Press the ENTER key to return to the Main Menu. The A/C System can now be

turned on and tested by monitoring the High (5) and Low (1) Pressure Gauges.

9. Close the Red (14) and Blue (13) Hose Valves, disconnect them from the A/C

System, and go to Page 6 (Recover/Recycle) to Evacuate the refrigerant from the Hoses.

December 9, 2002 Page 9

Page 11

WEIGHT= XX.X LB

AUTOMATIC

ENTER

RECYCLE HOLD

TIME XX MIN

AUTOMATIC

1. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3)

ON.

2. Attach the Red (14) and Blue (13) Hoses to the A/C System per the vehicle

manufacturer's instructions and open the Red (14) and Blue (13) Hose Valves.

3. Determine the refrigerant capacity of the A/C System to be charged.

Note: 1 oz = 0.02835 Kg & 1 Lb = 0.45359 Kg

>< ENTER

ENTER VACUUM

TIME XX MIN

>< ENTER

PEFORM LEAK

TEST

Y/N5

< ENTER

ADD OIL

Y/N5

< ENTER

ENTER CHARGE

AMOUNT= XX.X LB

>< ENTER

LOW LEVEL

GO TO

4. Using the Keypad (2), press the ENTER key when the Display (6) reads

“WEIGHT= XX.X LB” “AUTOMATIC? Menu.) The Display (6) will read “RECYCLE HOLD” “TIME XX MIN

5. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. Press the ENTER key to accept the value. The Display (6) will read “ENTER VACUUM” “TIME XX MIN

6. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. Press the ENTER key to accept the value. The Display (6) will read “PERFORM LEAK” “TEST? Y/N

7. Press the “Right Arrow” key to move the cursor between Y and N to select

5”.

8. Press the “Right Arrow” key to move the cursor between Y and N to select

5” (this is the default screen of the Main

5”.

FILL CYLINDER

ENTER

CHECK HIGH-LOW

CHARGE SWITCH

9. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. The value entered must be greater than zero. Press the ENTER key to accept the value. The Display (6) will read “CHECK HIGH-LOW” “CHARGE SWITCH

* This screen will display if the RHS780 Charge Cylinder contains less refrigerant

than the entered value. When this occurs, the charging Cylinder should be filled using the Fill Cylinder procedure on Page 5. Press the ENTER key to return to the Main Menu.

5”.

ENTER

10. Based on the vehicle manufacturer’s instructions, choose Charging through either

CHECK HOSES

START

ENTER

WEIGHT= XX.X LB

COMPRESSOR ON

December 9, 2002 Page 10

the High (14) Pressure Hose (preferred) or the Low (13) Pressure Hose by pressing the top or bottom (respectively) of the High-Low Charge Selector Switch (10) located on the left side of the RHS780 above the Fill Cylinder Port (11). Press the ENTER key when finished programming. The Display (6) will read “CHECK HOSES” “START?

Note: Do Not Turn On The A/C System. SAE compliant refrigerant handling

stations, like the RHS780, supply refrigerant in the liquid phase. Adding liquid refrigerant to a running A/C System may cause immediate A/C compressor failure.

11. Press the ENTER key to start the RHS780 Automatic sequence.

5”.

Page 12

WEIGHT= XX.X LB

AUTOMATIC (continued...)

COMPRESSOR OFF

HIGH PRESSURE

SEE MANUAL

CYLINDER FULL

GO TO CHARGE

TIME LEFT=XX MIN

PUMP ON

PUMP OFF XX MIN

CONTINUE

ENTER

ADD OIL NOW

A small quantity of refrigerant will probably remain in the A/C System as observed by an increasing pressure on the Low (1) Pressure Gauge. The RHS780 will automatically cycle ON to continue recovering refrigerant if pressure rises to a preset level. This automatic cycling will repeat resetting the Recycle Hold Timer each time. If a Vacuum Time greater than zero minutes was entered in Step 6, the Vacuum Pump will turn ON, the Display (6) will read “TIME LEFT=XX MIN”

“PUMP ON” and the minutes remaining will count down on the Display (6). The Vacuum Pump will turn OFF when the Display (6) reads zero minutes.

12. Drain any recovered oil using the Drain Recovered Oil procedure on Page 7.

* This screen will display if there is an internal fault. Please contact RTI

Technical Support. Turn the RHS780 Power Switch OFF.

** This screen will display when the Charging Cylinder fills to capacity,

13. If a Vacuum Leak Check was selected by choosing Y in Step 7 the Display (6) will

read “PUMP OFF XX MIN” “CONTINUE? ON. The elapsed time since the Vacuum Pump stopped will count up on the Display (6). An increasing pressure on the Low Pressure Gauge (1) is evidence of a vacuum leak in the A/C System. Press the ENTER key to continue with the Automatic sequence or RESET to return to the Main Menu.

5” and the Attention Light (7) will turn

CONTINUE

ENTER

WEIGHT= XX.X LB

CHARGING

RECYCLED=XX.X LB

EVAC HOSES

ENTER

DRAIN RECOVERED

OIL NOW!

ENTER

14. If Adding Oil was selected by choosing Y in Step 8 the Display (6) will read “ADD

OIL NOW” “CONTINUE? figure 4 and add oil to the side, either High (16) or Low (9) based on the vehicle manufacturer’s instructions, of the A/C System that will then be Charged during the Charging portion of the Automatic sequence by opening the valve on the Oil Charge Bottle, (16) or (9), and leaving it open until the correct amount of oil has left the Oil Charge Bottle, (16) or (9). Close the valve on the Oil Charge Bottle, (16) or (9), and press the ENTER key to continue.

15. If a Charge Amount greater than zero pounds was entered in Step 9 the Display

(6) will read “WEIGHT= XX.X LB” “CHARGING”as refrigerant leaves the Charging

Cylinder. The weight displayed will be increasing from zero to the Charge Amount entered plus a one ounce (0.03 KG) “Over Charge” set at the factory to compensate for hose loss. (See Setting Over Charge Amount [only] on Page 13 to change the default value.) When the RHS780 has finished the Display (6) will read “RECYCLED=XX.X LB” “EVAC HOSES” and the Attention Light (7) will turn ON.

16. Press the ENTER key. The Display (6) will read “DRAIN RECOVERED OIL

NOW!”. Drain any recovered oil using the Drain Recovered Oil procedure on Page 7.

17. Press the ENTER key to return to the Main Menu. The A/C System can now be

turned on checked by monitoring the High (5) and Low (1) Pressure Gauges.

18. Close the Red (14) and Blue (13) Hose Valves, disconnect them from the A/C

System and go to Page 6 (Recover/Recycle) to Evacuate the refrigerant from the Hoses.

5” and the Attention Light (7) will turn ON. Refer to

December 9, 2002 Page 11

Page 13

WEIGHT= XX.X LB

AUTOMATIC

>>>>> ENTER

WEIGHT= XX.X LB

Accessing Stored Data

1. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3)

ON.

2. Using the Keypad (2), press the “Up Arrow” key five times to display “WEIGHT=

XX.X LB” “SETUP? “FILTER HOURS=” “XX.X HOURS”.

5” and then press the ENTER key. The Display (6) will read

SETUP

ENTER

FILTER HOURS=

XX.X HOURS

TOTAL RECYCLED=

XXXX.X KG

TOTAL CHARGED=

XXXX.X KG

See the Filter Maintenance section of the manual, Page 14, for the procedure to change the filters. The normal Filter Change Interval is after every 25 hours.

Note: Press and hold the “Right Arrow” key and press the RESET key to remove

the “CHANGE FILTERS

3. Press the “Up Arrow” key. The Display (6) will read “TOTAL RECYCLED=”

“XXXX.X KG”.

4. Press the “Up Arrow” key. The Display (6) will read “TOTAL CHARGED=”

“XXXX.X KG”.

5. Press the “Up Arrow” key to return to the Main Menu.

5” message.

December 9, 2002 Page 12

Page 14

WEIGHT= XX.X LB

AUTOMATIC

>>>>> ENTER

WEIGHT= XX.X LB

SETUP

Calibration Switch

WEIGHT= XX.X LB

CHARGING

OVER CHARGE

Setting Over Charge Amount

1. Remove the front panel of the RHS780.

2. Setup the RHS780 as shown on Page 4 and then turn the Main Power Switch (3)

ON. Refer to the figure below to locate the access hole to the Calibration Switch (B) which is on the underside of the Circuit Board Cover ©) left of the LCD.

3. Remove the plastic “Calibration Tool”(A) from the lower mounting hole of the

4. Using the Keypad (2), press the “Up Arrow” key five times to display “WEIGHT=

XX.X LB” “SETUP? read “WEIGHT= XX.X LB” “CHARGING”.

5. Press the “Up Arrow” key. The Display (6) will read “OVER CHARGE”

“AMOUNT= X.XX KG

6. Press the “Up Arrow” key to change the value of the field. Press the “Right Arrow”

key to change to a different field. The value entered will be stored until this procedure is run again and a new value is entered. Press the ENTER key to accept the value. The Display (6) will then return to the Main Menu.

5”and press the Calibration Switch (B). The Display (6) will

5”.

AMOUNT= X.XX KG

><ENTER

7. Replace the front panel of the RHS780.

Note: 1 oz = 0.02835 Kg and 1 Lb = 0.45359 Kg

Note: Calibration Tool Part No. 360-81214-00

December 9, 2002 Page 13

Page 15

SCHEDULED MAINTENANCE

DAILY...

Check the oil level in the Vacuum Pump while the pump is running. The Vacuum Pump Oil Level Sight Glass is visible through a hole in the Lower Rear Panel of the RHS780. The oil level should be at the “half-way” point of the glass. If oil is not visible call Technical Support at 800-468-2321 extension 259.

MONTHLY...

Clean the Condenser to maintain high efficiency performance of the RHS780. Disconnect power and remove the lower rear perforated panel and blow compressed air through the cooling fins of the Condenser to remove any debris. Do not bend the fins on the Condenser coils. Air flow will be restricted causing damage to the RHS780. Replace the panel before applying power to the RHS780.

FILTER MAINTENANCE

The RHS780 automatically keeps track of Compressor Run Time. The Display (6) will read “CHANGE FILTERS 5” after every 25 hours every time the program returns to the Main Menu or whenever the RHS780 is turned on as a reminder to change the filters. Press ENTER

The “INLET” Combo Filter (left side) must be changed after every 25 hours of operation. RTI part number 026-80077-00.

The “OUTLET” Combo Filter (right side) must be changed after every 50 hours of operation. RTI part number 026-80069-00.

5 to go to the Main Menu.

The Hours Counter is reset when the “CHANGE FILTERS when only the “INLET” Combo Filter is changed versus when both are changed.

Change the filters as described below:

1. Remove front panel to service the Combo Filters.

2. Disconnect Flare Fittings from top and bottom of filters.

3. Remove mounting nuts and filters.

4. Transfer filter insulation material to new filter as applicable.

5. Install new Combo Filters using hardware removed in Step 3.

6. Connect Flare Fittings to top and bottom of filters.

7. Check for leaks and repair as necessary.

8. Replace front panel.

9. Go to Page 12, Accessing Stored Data, for instructions on how to remove the “CHANGE FILTERS

5” message is cleared. Record the filter changes performed to track

5” message.

December 9, 2002 Page 14

Page 16

Rear View

PARTS IDENTIFICATION

P/N DESCRIPTION

1 360-81292-00 Solenoid MOV Sub-Assy

120V

2 025-80314-03 Contactor Varistor

50-129 VAC/DC

3 024-80037-00 Contactor ½ HP (120V)

3NC/1NC

4 024-80035-00 Rocker Switch SPST

(mom-on) Non-lighted

5 360-80369-02 D/P Switch R134A

6 360-81439-00 Condenser Assy

7 022-80050-01 Low Pressure Switch

3psig-15 In-Hg SPDT

8 360-81447-00 Cylinder Assy 30 lbs.

9 360-81426-01 Heater Belt Assy

10 024-80066-00 Rocker Switch SPDT

Visired Non-lighted

11 360-81440-00 Load Cell Assy

12 360-80416-00 Fan Assy 120V

December 9, 2002 Page 15

Page 17

PARTS IDENTIFICATION (RHS780)

Front View

P/N DESCRIPTION

1 026-80240-00

026-80241-00

2 026-80077-00 Combo Filter 3/8 Flare (Long)

3 026-80070-00 Accumulator Assy

4 022-80110-00 Valve Automatic Expansion

5 360-81670-01 Compressor Assy 780 120V

6 026-80069-00 Combo Filter 3/8 Flare (Short)

7 022-80015-02 High Pressure Switch 120V

8 026-80229-00 Pump Vac 7 CFM

Filter In-Line (R12) Filter In-Line (R134a)

3/8 MFL x 3/8 MFL

December 9, 2002 Page 16

Page 18

PARTS IDENTIFICATION

Top Panel

P/N DESCRIPTION

1 024-80040-00 Rocker Switch SPDT

(on-on) Amber (125V)

2 024-80078-01 Circuit Board 120V

3 026-80065-03 Gauge 30"-120 Psig 1/4

MFL 3.5"

4 025-80046-00

025-80127-00

025-80191-00

5 026-80071-03 Gauge 0-500 Psig

Terminal RCPT

Clear Bulb Bayonet Base 120V

Lens Assembly Yellow

1/4 MFL 3.5"

December 9, 2002 Page 17

MAHLE RTI RHS780 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual