MAHLE RTI RHS730 User Manual Rev A

OPERATION & MAINTENANCE MANUAL

RHS730

Refrigerant Handling Station

RTI Technologies, Inc.

4075 East Market Street P.O. Box 3099 York, Pennsylvania USA 17402 717-840-0678 (Ext. 259) Web: www.rtitech.com E-mail: tech@rtitech.com

Manual P/N 035-81031-00 (Rev A)

Two Modes of Operation

The RHS730 can be used to perform semi-automatic procedures or run in a fully automatic mode.

The following Table of Contents will direct you to the proper sections for detailed operating instructions.

TABLE OF CONTENTS - RHS730

Before Using the RHS730 ...................... 2

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

How the RHS730 Operates ..................... 3

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

Semi-Automatic Procedures

Fill Charge Cylinder ........................... 5

Recycle .................................... 6

Drain Recovered Oil........................... 7

Manual Air Purge ............................. 7

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

Charge ..................................... 9

Fully Automatic Procedure

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

Programming & Maintenance

Access Stored Data ...........................13

Set Over Charge Amount .......................14

Calibrate Weight Scale.........................15

Scheduled Maintenance ........................16

Filter Maintenance ............................16

Change Filters ...............................16

Parts Identification ............................17

Solenoid & Contactor Identification ...............19

Technical Support 800-468-2321

BEFORE USING THE RHS730

Check for any shipping damage. Place a claim with carrier if damage is discovered. DO NOT USE A DAMAGED UNIT. These general instructions describe normal operation and maintenance situations encountered with the RHS730. 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 RHS730 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 RHS730 in accordance with all specifications and laws which may

apply. A regular schedule of inspection of the RHS730 should be established and records maintained with special attention given

to Hoses, Vacuum Pump Oil Level and Filters.

SAFETY PRECAUTIONS

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 RHS730 operating procedures sequentially to avoid prematurely disconnecting hoses or opening valves which

may release refrigerant to the atmosphere. Do not expose the RHS730 to moisture or operate in wet areas. Use the RHS730 in locations with mechanical ventilation that provides at least four air changes per hour. Hoses used with the RHS730 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 RHS730 and the release of refrigerant when being connected or disconnected.

Disconnect power before performing any maintenance or service on the RHS730. Connect the RHS730 to a properly grounded receptacle. Do not over load the circuit (20 amp minimum). Avoid using an extension cord with the RHS730. If necessary, use a good condition three wire, grounded, #14 AWG (2.0

) or larger extension cord of the shortest possible length (maximum 25 ft. - 8 m).

mm Do not connect the RHS730 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 recycled from the vapor side only. Never connect the Red or Blue Hose of the RHS730 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.

Page 2

HOW THE RHS730 OPERATES

The RHS730 is microprocessor controlled with a menu-driven user interface. All functions are performed by entering a few simple key strokes and following the prompts on the display. The on-board charge cylinder is mounted on a load cell. The weight of refrigerant in the charge cylinder is electronically displayed.

The RHS730 has a Fill Cylinder feature which allows refrigerant to be transferred directly into the charge cylinder without going through the normal Recycle mode. This feature allows the RHS730 charge cylinder to be re-filled directly from a cylinder of new refrigerant. The process automatically stops at approximately 20 lbs (9 kg).

The RHS730 recycles refrigerant in a true single-pass through the filters and stores the refrigerant in the charge cylinder where it’s immediately available for use. This process automatically stops at 24 lbs (11 Kg) or when a 15 In-Hg (-0.5 Bar) vacuum is sensed in the A/C system.

The RHS730 pauses for a minimum factory-set default of two minutes for out gassing and cold refrigerant to raise the pressure back up to 3 psig (0.2 Bar) at which time the recycle process will start again and reset the Recycle Hold Timer. When the pressure does not rise to reset the timer during the two minute pause, the display will indicate that the process is complete. The Recycle Hold Timer can be changed every time a Recycle procedure is run.

Longer recycle hold times should be selected on colder days or when servicing an A/C system with a large liquid capacity. Increasing this value may increase total time to recycle while decreasing the time may result in an incomplete recycling of refrigerant from the A/C system.

Refer to the table below for guidelines on setting the Recycle Hold Timer. The value entered is stored in the memory of the RHS730 and becomes the default value each time it is set.

Temperature Less than 50

Recycle Hold Time 10 minutes 5 minutes 2 minutes

F (100 C) 500 F (100 C) to 800 F (26.50 C) Greater than 800 F (26.50 C)

Non-condensable gases (air) are vented automatically during the recycle process. The amount of refrigerant recycled is displayed at the end of the procedure. This value is added to the total amount

recycled and is stored in the memory of the RHS730. A 7 CFM vacuum pump draws on both the high and low hoses, ensuring c omplete 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. The value entered is stored in the memory of the RHS730 and becomes the default value each time it is set.

The low pressure gauge can be monitored to see a rise in A/C system pressure. When programmed to do so, the RHS730 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 time or vacuum time value should have been entered.

A relatively constant vacuum reading over a long period of time (less than 2 In-Hg [0.05 Bar] rise over ten minutes) is the most accurate way to check for vacuum leaks.

The RHS730 can also be programmed to pause to allow oil to be added to the A/C system after vacuuming and prior to charging.

Charging is done from the on board charge cylinder. An integrated heater automatically engages whenever charging occurs. The A/C capacity is entered on the Keypad. The value entered is stored in the memory of the RHS730 and becomes the default value each time it is set. As refrigerant leaves the RHS730, the display will show an increasing weight up to the programmed charge amount plus a factory-set one ounce (0.03 Kg) over charge amount necessary for compensation of refrigerant loss in the hoses.

The over charge amount can be changed to accommodate different operating conditions. The amount of refrigerant charged is added to the total amount charged and stored in the memory of the RHS730.

The high side red hose can be connected to the low side port o f the RHS730 for charging to the low side of vehicles with only a low side port. Follow the vehicle manufacturer’s charging procedure when charging to the low side to avoid damaging the A/C system compressor.

Page 3

SETUP

New

Refrigerant

Anti-Blowback

Valve

To Fill Port

Page 4

WEIGHT= XX.X LB

AUTOMATIC

>>>>

WEIGHT= XX.X LB

FILL CYLINDER

FILL CHARGE CYLINDER

1. Connect a cylinder of new refrigerant to the Fill Port on the rear of the

RHS730 as shown on Page 4. Anti-blowb ack Valve must connect to the RHS730. Turn the cylinder up-side-down. Turn Main Power Switch on.

The display will show WEIGHT= XX.X LB AUTOMATIC?

2. Press the

CYLINDER?

> key four times to display WEIGHT= XX.X LB FILL

ENTER

START

ENTER

WEIGHT= XX.X LB

COMPRESSOR ON

FILL COMPLETE

FILLED= XX.X LB

ENTER

HIGH PRESSURE

SEE MANUAL

3. Press the ENTER key. The display will read START?

4. Open the valve on the cylinder of new refrigerant.

5. Press the ENTER key to start filling the RHS730.

6. Close the valve on the refrigerant cylinder.

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

The Display will read WEIGHT= XX.X LB COMPRESSOR ON. When the weight is approximately 20 lbs (9 kg) the RHS730 will turn OFF, the display will read FILL COMPLETE FILLED=XX.X LB (the amount of refrigerant removed from the cylinder). The Attention Light will turn on.

The RESET button on the keypad can be pressed at any time to stop the Fill Cylinder procedure prior to it filling and shutting off automatically.

This procedure may be slow or fail to work if the internal charge cylinder pressure is higher than the pressure in the cylinder of new refrigerant. Check and purge air if necessary (See Page 7).

Also, try putting a heat belt on the new refrigerant cylinder.

CYLINDER FULL

GO TO CHARGE

* While filling the charge cylinder, this screen will display periodically

concurrent with the Attention Light turning on. This is normal and nothing to be concerned about. The screen will return to normal after a few seconds.

** This screen will display if the charge cylinder fills to capacity,

approximately 24 lbs (11 Kg). If this occurs, the weight can be lowered using the Charge procedure on Page 9. This must be done before the RHS730 can be used to recycle more refrigerant. Press the ENTER key to return to the Main Menu.

Notes:

It may be desirable to skip this procedure for large capacity or multiple A/C systems where recharge will not be done between successive recycling procedures.

The RHS730 uses 22 lbs (10 Kg) of refrigerant when filling the first time. If the cyli nder of new refrigerant is emptied, the RHS730 will appear to stop filling (the weight displayed will stop increasing) and w ill stay in this condition until the RESET key is pressed.

The RHS730 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.

The RHS730 Charge Cylinder can also be filled from the GAS or VAPOR side of a cylinder by following the Recycle procedure on Page 6.

The yellow hose can be disconnected from the Fill Port on the rear of the RHS730 and reconnected to either the Blue (Low side) or Red (High Side) hose connection port on the side of the RHS730 to allow recycling any refrigerant remaining in the yellow hose using the Recycle procedure on Page 6.

Page 5

WEIGHT= XX.X LB

AUTOMATIC

WEIGHT= XX.X LB

RECYCLE

1. See RHS730 Setup on Page 4. Turn Main Power Switch on.

The display will show WEIGHT= XX.X LB AUTOMATIC?

2. Attach Red and Blue Hoses to the A/C System per the vehicle manufacturer's instructions. Open the Red and Blue Hose Valves.

RECYCLE

ENTER

RECYCLE HOLD

TIME XX MIN

>< ENTER

START

ENTER

WEIGHT= XX.X LB

COMPRESSOR ON

WEIGHT= XX.X LB

COMPRESSOR OFF

AMOUNT RECYCLED=

XX.X LB

3. Press the

and press the ENTER key. The Display will read RECYCLE HOLD TIME XX MIN

4. Press the to a different field. Press the ENTER key to accept the value. The Display

will then read START?

5. Press the ENTER key to start recycling.

6. Close the Red and Blue Hose Valves and disconnect the hoses from the A/C system.

> key one time to display WEIGHT= XX.X LB RECYCLE? 5

The Recycle Hold Time is the amount of time that the RHS730 waits for out-gassing or for the pressure in the A/C System being recycled to rise enough to automatically restart the recycling process. The minimum time is two minutes. The value entered is stored in the memory of the RHS730 and is displayed as the default value next time.

> key to change the value of the field. Press the < key to move

The Display will read WEIGHT= XX.X LB COMPRESSOR ON. The RHS730 will 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 Pressure Gauge. The Display 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 Pressure Gauge. The RHS730 will automatically cycle on to continue recycling refrigerant if pressure rises to a preset level. This automatic cycling will repeat, resetting the Recycle Hold Timer each time. When the RHS730 remains off for the duration of the Recycle Hold Timer value entered in Step 4, the Display will read AMOUNT RECYCLED= XX.X LB the Attention Light will turn on.

5 and

ENTER

DRAIN RECOVERED

OIL NOW!

ENTER

HIGH PRESSURE

SEE MANUAL

CYLINDER FULL

GO TO CHARGE

7. P ress the ENTER key. The Display will read DRAIN RECOVERED OIL NOW!

procedure on Page 7.

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

5. Drain any recovered oil using the Drain Recovered Oil

* This screen will display if there is an internal fault. Turn the RHS730

Main Power Switch off. Contact RTI Technical Support.

** This screen will display if the charge cylinder fills to capacity of

approximately 24 lbs (11 Kg.). If this occurs, the weight must be lowered using the Charge procedure on Page 9 before the RHS730

can be used to recycle more refrigerant. Press the ENTER key to return to the Main Menu.

Page 6

DRAIN RECOVERED OIL

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

1. Turn Main Power Switch on. The display will show WEIGHT= XX.X LB AUTOMATIC?

2. Press and hold the Oil Drain Re-pressurization Switch on the rear of the RHS730 for five seconds.

3. Slowly open the valve on the Oil Drain Bottle to drain any oil which may have been removed from the A/C System. Unless the A/C System had previously been overfilled, the RHS730 will typically not remove enough oil to make

replenishment necessary.

4. Close the valve on the Oil Drain Bottle.

5. Press and hold the Oil Drain Re-pressurization Switch for five seconds. This allows any residual Non-Condensable Gas to be re-circulated for reprocessing during the next recycle procedure.

Note: The Drain Recovered Oil procedure may be done while the RHS730 is performing the Deep Vacuum

procedure on the next page.

WARNING

Failure to perform the Drain Oil procedure after every recycle procedure will cause the RHS730 to eventually fail.

Repair of the RHS730 to correct this problem is not covered by warranty.

Manual Air Purge

The RHS730 purges air (also referred to as Non-Condensable Gas) automatically. There may be occasions where an extra purge may be desired. One instance is when the Fill Charge Cylinder process seems slow. The following steps allow a manual purge.

1. Turn Main Power Switch on. The display will show WEIGHT= XX.X LB AUTOMATIC?

2. Slowly open the valve on the Oil Drain Bottle.

3. Press and hold the Oil Drain Re-pressurization Switch on the rear of the RHS730 for five seconds.

4. Close valve on the Oil Drain Bottle.

5. Press and hold the Oil Drain Re-pressurization Switch for five seconds.

Page 7

WEIGHT= XX.X LB

DEEP VACUUM

AUTOMATIC

WEIGHT= XX.X LB

VACUUM

ENTER

A/C HAS PRESSURE

GO TO RECYCLE

ENTER VACUUM

TIME XX MIN

>< ENTER

1. See RHS730 Setup on Page 4. Turn Main Power Switch on.

2. Attach Red and Blue Hoses to the A/C System per the vehicle manufacturer's instructions. Open the Red and Blue Hose Valves.

3. Press the

4. Press the

and press the ENTER key. The Display will read ENTER VACUUM TIME XX MIN

* This screen will display if the RHS730 senses a pressure in either the

to a different field. The value entered must be greater than zero. Press the ENTER key to accept the value. The Display will read PERFORM LEAK

TEST? Y/N

> key two times to display WEIGHT= XX.X LB VACUUM? 5

Red or Blue Hose. When this occurs, the A/C System must be emptied using the Recycle procedure on Page 6. Press the ENTER key to return to the Main Menu.

> key to change the value of the field. Press the < key to move

PERFORM LEAK

TEST

Y/N5

< ENTER

ADD OIL

Y/N5

< ENTER

START

ENTER

TIME LEFT=XX MIN

PUMP ON

PUMP OFF XX MIN

CONTINUE

5. Press the not the RHS730 pauses at the end of Vacuum procedure 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 value entered is stored in the memory of the RHS730 and is displayed as the default value next time. The Display will read ADD OIL? Y/N

6. Press the not the RHS730 pauses at the end of the Vacuum procedure (or Leak

Test) to allow adding of oil to the A/C system. Press the ENTER key to accept the Yes or No choice. The value entered is stored in the memory of the RHS730 and is displayed as the default value next time. The Display will read START?

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

8. If a Vacuum Leak Check was selected by choosing Y in Step 5 the display will read PUMP OFF XX MIN CONTINUE? turn on. The elapsed time since the Vacuum Pump turned off will count up on the display. An increasing pressure on the Low Pressure Gauge is evidence of a vacuum leak in the A/C system. Press the RESET key to

return to the Main Menu (so the leak can be repaired) or press the ENTER key to proceed to Add Oil if selected in Step 6.

< key to move the cursor between Y and N to select whether or

The Vacuum Pump will turn on, the display will read TIME LEFT=XX MIN PUMP ON. The minutes remaining will count down on the

display. The Vacuum Pump will turn off when the display reads zero minutes.

5 and the Attention Light will

ENTER

ADD OIL NOW

CONTINUE

ENTER

9. If Add Oil was selected by choosing Y in Step 6 the Display will read ADD

OIL NOW CONTINUE?

Fill the Oil Charge Bottle. Open the valve on the Oil Charge Bottle and leave it open until the correct amount of oil has left the Oil Charge Bottle. Close the valve on the Oil Charge Bottle and press the ENTER key to return to the Main Menu. (The oil drawn in will be charged with the refrigerant during the Charge procedure on Page 9).

5. The Attention Light will turn on.

Page 8

WEIGHT= XX.X LB

CHARGE

AUTOMATIC

>>>

WEIGHT= XX.X LB

CHARGE

ENTER

ENTER CHARGE

AMOUNT= XX.X LB

>< ENTER

LOW LEVEL

FILL CYLINDER

GO TO

1. See RHS730 Setup on Page 4.Turn the Main Power Switch on.

2. Attach the Red and Blue Hoses to the A/C system per the vehicle manufacturer's instructions and open the Red and Blue Hose Valves.

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

4. Press the

5. Press the

and press the ENTER key. The Display will read ENTER CHARGE AMOUNT= XX.X LB

to a different field. The value entered must be greater than zero. Press the ENTER key to accept the value. The value entered is stored in the memory of the RHS730 and is displayed as the default value next time. The Display will read CHECK HOSES

* This screen will display if the RHS730 charge cylinder contains less

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

1 oz = 0.02835 Kg 1 Lb = 0.45359 Kg

> key three times to display WEIGHT= XX.X LB CHARGE? 5

>key to change the value of the field. Press the < key to move

CHECK HOSES

ENTER

WEIGHT= XX.X LB

CHARGING

CHARGE COMPLETE

EVAC HOSES

ENTER

Refrigerant is usually charged to the high side of an A/C system through the Red Hose. The Blue Hose can be connected to the high side port (where Red Hose is normally connected) if it is

desired to charge to the low side of the A/C system. This should only be done if the vehicle manufacturer specifies charging to the low side.

Do not turn on the A/C system.

SAE compliant refrigerant handling stations, like the RHS730, charge refrigerant in the liquid phase. Adding liquid refrigerant to a running A/C system may cause immediate A/C compressor failure.

6. Press the ENTER key to start charging.

The Display will read WEIGHT= XX.X LB CHARGING as refrigerant leaves the Charge Cylinder. The weight displayed will increase 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 refrigerant left in the hoses (See Set Over Charge Amount on Page 14 to change the default value). When the RHS730 has finished, the Display will read

CHARGE COMPLETE EVAC HOSES

turn on.

5 and the Attention Light will

7. Press the EN TER key to return to the Main Menu. The A/C system can now be turned on and tested by monitoring the High and Low Pressure Gauges.

8. Close the Red and Blue Hose Valves. Disconnect hoses from the A/C system and go to Page 6 (Recycle) to evacuate the refrigerant from the hoses.

Page 9

WEIGHT= XX.X LB

AUTOMATIC

ENTER

RECYCLE HOLD

TIME XX MIN

1. See RHS730 Setup on Page 4. Turn Main Power Switch ON.

2. Attach the Red and Blue Hoses to the A/C System per the vehicle

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

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

1 oz = 0.02835 Kg 1 Lb = 0.45359 Kg

4. Press the ENTER key when the Display reads WEIGHT= XX.X LB

AUTOMATIC?

5. The Display will read RECYCLE HOLD TIME XX MIN

>< ENTER

ENTER VACUUM

TIME XX MIN

>< ENTER

PERFORM LEAK

TEST

Y/N5

< ENTER

ADD OIL

Y/N5

< ENTER

ENTER CHARGE

AMOUNT= XX.X LB

>< ENTER

LOW LEVEL

GO TO

5. Press the

6. Press the

7. Press the

8. Press the

The Recycle Hold Time is the length of time that the RHS730 waits for out-gassing or for the pressure in the A/C system being recycled to rise enough to automatically restart the recycling process. The minimum value is two minutes. The value entered is stored in the memory of the RHS730 and is displayed as the default value next time.

> key to change the value of the field. Press the < key to move

to a different field. Press the ENTER key to accept the value. The Display will read ENTER VACUUM TIME XX MIN

> key to change the value of the field. Press the < key to move

to a different field. Press the ENTER key to accept the value. The Display will read PERFORM LEAK TEST? Y/N

< key to move the cursor between Y and N to select whether

or not the RHS730 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 value entered is stored in the memory of the RHS730 and is displayed as the default value next time. The Display will read ADD OIL? Y/N

< key to move the cursor between Y and N to select whether

or not the RHS730 pauses at the end of Vacuum procedure (or Vacuum Leak Test) to allow the adding of oil to the A/C system. Press the ENTER key to accept the Yes or No choice. The value entered is stored in the memory of the RHS730 and is displayed as the default value next time. The Display will read ENTER CHARGE AMOUNT= XX.X LB

FILL CYLINDER

ENTER

CHECK HOSES 5

ENTER

START

ENTER

AUTOMATIC

9. Press the

* This screen will display if the RHS730 charge cylinder contains less

10. Press the ENTER key. The Display will read START?

> key to change the value of the field. Press the < key to move

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

Do not turn on the A/C system

SAE compliant refrigerant handling stations, like the RHS730,

charge 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 RHS730 Automatic sequence.

Page 10

WEIGHT= XX.X LB

AUTOMATIC - Continued

COMPRESSOR ON

WEIGHT= XX.X LB

COMPRESSOR OFF

HIGH PRESSURE

SEE MANUAL

CYLINDER FULL

GO TO CHARGE

The Display will read WEIGHT= XX.X LB COMPRESSOR ON. The RHS730 will 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 Pressure Gauge. The Display will read WEIGHT= XX.X LB COMPRESSOR OFF.

* This screen will display if there is an internal fault. Turn the RHS730

Power Switch off. Contact RTI Technical Support.

** This screen will display when the charge cylinder fills to capacity,

approximately 24 lbs (11 Kg.) If this occurs, the weight can be lowered using the Charge procedure on Page 9 before the RHS730 can be used to recycle more refrigerant. Press the ENTER key to return to the Main Menu.

When the RHS730 remains off for the duration of the Recycle Hold Timer value entered in Step 5 the Display will change to one of the following two steps:

TIME LEFT=XX MIN

PUMP ON

PUMP OFF XX MIN

CONTINUE

ENTER

1 - The value entered for vacuum time in Step 6 was zero - the Display

will read WEIGHT= XX.X LB CHARGING. Go to Step 15.

2 - The value entered for vacuum time in Step 6 was greater than zero -

the Display will read TIME LEFT=XX MIN PUMP ON. Go to Step 12.

12 The vacuum pump will turn on. The Display will read TIME LEFT=XX

MIN PUMP ON and the minutes remaining will count down on the Display.

Once the vacuum pump is running, any recovered oil must be drained and measured as follows:

12.1 Press and hold the Oil Drain Re-pressurization Switch on the rear of the RHS730 for five seconds.

12.2 Slowly open the valve on the Oil Drain Bottle to drain any oil which

13. If a Vacuum Leak Check was selected by choosing Y in Step 7 the

may have been removed from the A/C System.

12.3 Close the valve on the Oil Drain Bottle.

12.4 Press and hold the Oil Drain Re-pressurization Switch for five seconds. This causes any residual Non-Condensable Gas to be re-circulated for reprocessing during the next recycle procedure.

The Vacuum Pump will turn off when the Display reads zero minutes.

Display will read PUMP OFF XX MIN CONTINUE? Light will turn on. (Skip to Step 14 if Vacuum Leak Check was not selected).

5 and the Attention

The elapsed time since the Vacuum Pump stopped will count up on the Display. An increasing pressure on the Low Pressure Gauge indicates 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 in case of a vacuum leak.

Page 11

ENTER

AUTOMATIC - Continued

ADD OIL NOW

CONTINUE

ENTER

WEIGHT= XX.X LB

CHARGING

RECYCLED=XX.X LB

EVAC HOSES

ENTER

DRAIN RECOVERED

OIL NOW!

14. If Add Oil was selected by choosing Y in Step 8 the Display will read

ADD OIL NOW CONTINUE?

to Step 15 if Add Oil was not selected). Fill the Oil Charge Bottle. Open the valve on the Oil Charge Bottle and

leave it open until the correct amount of oil (measured in Step 12) has left the Oil Charge Bottle. Close the valve on the Oil Charge Bottle and press the ENTER key to continue. The oil drawn in will be charged with the refrigerant during the Charge procedure.

15. If a Charge Amount greater than zero pounds was entered in Step 9 the Display will read WEIGHT= XX.X LB CHARGING as refrigerant leaves the Charge Cylinder. The weight displayed will increase 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 Set Over Charge Amount on Page 14 to change the default value. When the RHS730 has finished, the Display will read RECYCLED=XX.X LB EVAC HOSES and the Attention Light will turn on.

16. Press the ENTER key. The Display will read DRAIN RECOVERED OIL

NOW!. This is a reminder that oil must be drained after every recycle procedure. If it was drained in Step 12 above it is not necessary to drain

it here. If it was not drained in Step 12, drain any recovered oil as follows:

16.1 Press and hold the Oil Drain Re-pressurization Switch on the rear

of the RHS730 for five seconds.

16.2 Slowly open the valve on the Oil Drain Bottle to drain any oil which

may have been removed from the A/C System.

5 and the Attention Light will turn on. (Skip

ENTER

16.3 Close the valve on the Oil Drain Bottle.

16.4 Press and hold the Oil Drain Re-pressurization Switch for five

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

WARNING

Failure to perform the Drain Oil procedure after every recycle procedure will cause the RHS730 to eventually fail.

Repair of the RHS730 to correct this problem is not covered by warranty.

17. Press the ENTER key to return to the Main Menu. The A/C System can now be turned on and checked by monitoring the High and Low Pressure Gauges.

18. Close the Red and Blue Hose Valves. Disconnect them from the A/C System and go to Page 6 (Recycle) to evacuate the refrigerant from the hoses if desired.

Page 12

WEIGHT= XX.X LB

AUTOMATIC

ACCESS STORED DATA

1. Turn the Main Power Switch on.

>>>>> ENTER

WEIGHT= XX.X LB

SETUP

ENTER

FILTER HOURS=

XX.X HOURS

TOTAL RECYCLED=

XXXX.X KG

2. Press the

3. Press the

4. Press the

5. Press the

> key five times to display WEIGHT= XX.X LB SETUP? 5 and

then press the ENTER key. The Display will read FILTER HOURS= XX.X HOURS.

See Filter Maintenance (Page 15) for the procedure to change the filters. The normal Filter Change Interval is after every 25 hours.

Press and hold the

CHANGE FILTERS

< key and press the RESET key to remove the

5 message.

> key. The Display will read TOTAL RECYCLED XXXX.X KG.

> key. The Display will read TOTAL CHARGED= XXXX.X KG.

> key to return to the Main Menu.

TOTAL CHARGED=

XXXX.X KG

Page 13

WEIGHT= XX.X LB

SET OVER CHARGE AMOUNT

1. Remove two screws on each side to remove front cover. Remove four

screws and carefully tilt top control panel up to gain access to printed circuit board cover.

2. Turn the Main Power Switch on.

AUTOMATIC

>>>>> ENTER

WEIGHT= XX.X LB

SETUP

Press Calibration Switch

WEIGHT= XX.X LB

CHARGING

OVER CHARGE

AMOUNT= X.XX KG

><ENTER

Refer to the figure below to locate the access hole for the Calibration Switch which is on the underside of the Circuit Board Cover.

3. Remove the plastic Calibration Tool.

4. Press the

5. Gently press the Calibration Switch with the Calibration Tool.

The Display will read WEIGHT= XX.X LB CHARGING.

6. Press the

7. Press the

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 will then return to the Main Menu.

8. Place the Calibration Tool in the storage hole.

9. Lower top control panel, being careful to not bend or crimp copper tubes,

and install screws. Replace the front cover.

> key five times to display WEIGHT= XX.X LB SETUP? 5 .

> key. The Display will read OVER CHARGE AMOUNT= X.XX

> key to change the value of the field. Press the < key to move

1 oz = 0.02835 Kg 1 Lb = 0.45359 Kg

Calibration Tool Part No. 360-81214-00

Calibration Tool in

Storage Position

Printed Circuit

Board Cover

Calibra t io n

Switch

Calibration Tool

in Access Hole

Ready to Press

Calibra tio n Switch

Page 14

WEIGHT= XX.X LB

AUTOMATIC

>>>>> ENTER

WEIGHT= XX.X LB

SETUP

CALIBRATE WEIGHT SCALE

1. Remove two screws on each side and remove front cover. Remove four screws and carefully tilt top control panel up to gain access to printed

circuit board cover. Refer to the illustration on preceding page.

2. Remove Red Hose from High Side Port and connect the Blue Hose from the High Side Port to the Vapor Port of a DOT cylinder. Use Low Side Tank Adapter (RTI Part Number 023-80147-00). Open valve on DOT cylinder.

3 Locate the access hole for the Calibration Switch which is on the

underside of the Circuit Board Cover.

4. Remove the plastic Calibration Tool.

Press Calibration Switch

WEIGHT= XX.X LB

CHARGING

After 15 minutes or Press Calibration Switch

CALIBRATION

MIN WEIGHT ON

ENTER

CALIBRATION

MAX WEIGHT ON

ENTER

CALIBRATION DONE

REMOVE WEIGHT

5. Press the

6. Gently press the Calibration Switch with the Calibration Tool. The Display will read WEIGHT= XX.X LB CHARGING.

The RHS730 charges out the contents of the Charge Cylinder. It automatically continues to the next step after fifteen minutes. The calibration switch can be pressed at any time during this fifteen minutes to proceed to the next step.

7. The Display will read CALIBRATION MIN WEIGHT ON

8. Press the ENTER key. The display will read CALIBRATION MAX

WEIGHT ON

9. Place the two 5 Kg calibration weights on the square plate under the charge cylinder as shown in the illustration below.

10. Press the ENTER key. The display will read CALIBRATION DONE

REMOVE WEIGHT

11. Press the ENTER key. The display will then read OVER CHARGE AMOUNT= X.XX KG

12. Press the move 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 will then return to the Main Menu.

> key five times to display WEIGHT= XX.X LB SETUP? 5

5. Remove the Calibration Weights.

> key to change the value of the field. Press the < key to

ENTER

OVER CHARGE

AMOUNT= X.XX KG

><ENTER

1 oz = 0.02835 Kg 1 Lb = 0.45359 Kg

13. Place the Calibration Tool in the storage hole.

14. Lower top control panel, being careful to not bend or crimp copper tubes,

and install screws. Replace the front cover and install screws.

Calibration Tool Part No. 360-81214-00

Calibration Weight Kit Part No. 360-81282-00

Rear

Charge

Cylinder

Calibration Weights

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 Left Side Panel of the RHS730. 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 RHS730. Disconnect power and remove the panel below the filters on the rear of the RHS730. Blow compressed air through the cooling fins of the Condenser (from inside of cabinet towards the vent slots in the side panel) to remove any debris. Do not bend the fins on the Condenser coils. Air flow will be restricted causing damage to the RHS730. Replace the panel before applying power to the RHS730.

FILTER MAINTENANCE

The RHS730 automatically keeps track of Compressor Run Time. The Display will read CHANGE FILTERS 5 after every 25 hours every time the program returns to the Main Menu or whenever the RHS730 is turned on as a reminder to change the filters. Press ENTER to go to the Main Menu.

The INLET Combo Filter (left side on rear) must be changed after every 25 hours of operation.

RTI part number 026-80069-00.

The OUTLET Combo Filter (right side on rear) must be changed after every 50 hours of operation.

RTI part number 026-80077-00.

The Hours Counter is reset when the CHANGE FILTERS changes performed to track when only the INLET Combo Filter is changed versus when both are changed.

5 message is cleared (refer to page 13). Record the filter

CHANGE FILTERS

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

2. Remove mounting nuts and filters.

3. Install new Combo Filters using hardware removed in Step 2.

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

5. Check for leaks and repair as necessary.

6. Go to Page 13, Access Stored Data, for instructions to remove the CHANGE FILTERS

5 message.

Page 16

PARTS IDENTIFICATION - Front View

P/N DESCRIPTION

1 024-80097-01 Circuit Board

2 024-80040-00 Rocker Switch SPDT

3 026-80065-03 Gauge 30 InHg - 120 PSIG

4 360-81307-00 High Pressure Switch

5 360-80369-02 D/P Switch R134A

6 360-81292-00 Solenoid MOV Sub-Assy

7 360-81447-00 DOT Cylinder Assy

120V

(on-on) Amber (125V)

1/4 MFL 3.5 in.

120V

30 lbs

8 031-80003-00 Load Cell Assy

9 360-81426-01 Heater Belt Assy

10 024-80037-00

025-80314-03

11 022-80050-01 Low Pressure Switch

12 022-80110-00 Expansion Valve

13 026-80071-03 Gauge 0 - 500 PSIG

14 025-80127-00

025-80191-00

Contactor ½ HP (120V) 3NC - 1NC

Varistor

3 PSIG - 15 InHg SPDT

3/8 MFL x 3/8 MFL

1/4 MFL 3.5 In. Bulb Bayonet Base (120V)

Yellow Lens Assy

Page 17

PARTS IDENTIFICATION - Rear View

P/N DESCRIPTION

1 026-80069-00 Combo Filter 3/8 Flare

(Short)

2 026-80208-00

026-80208-01

3 026-80077-00 Combo Filter 3/8 Flare

4 024-80035-00 Rocker Switch SPST

5 026-80207-00

026-80207-01

6 026-80229-00 Vacuum Pump - 7 CFM

10 360-81439-00 Condenser Assembly

11 360-80416-00 Fan Assembly

12 360-81670-01 Compressor Assembly

13 026-80070-00 Accumulator Assembly

Oil Charge Bottle with Valve Oil Charge Bottle only

(Long)

Momentary On - Non-lighted Oil Drain Bottle with Valve

Oil Drain Bottle only

120V

026-80240-00 026-80241-00

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

Rear View - Cover Off

Page 18

Solenoid & Contactor Identification

Page 19

MAHLE RTI RHS730 User Manual Rev A

Specifications and Main Features

Frequently Asked Questions

User Manual