O p e r a t i n g M a n u a l Operating Manual for Model 34788 Recovery, Recycling, Recharging Unit
Model 34788 Recovery, Recycling, & Recharging Unit SAFETY DEFINITIONS: Follow all WARNING, CAUTION, and NOTE messages in this manual. These messages are defined as follows: WARNING means you may risk serious personal injury or death; CAUTION means you may risk personal injury, property damage, or unit damage; and NOTEs and OPERATING TIPS provide clarity and helpful information. These safety messages cover situations ROBINAIR is aware of.
Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Menu Functions . . . . . . . . . . . . . . . . .
Introduction Robinair No. 34788 is used on R-134a vehicles and is designed to be compatible with existing service equipment and standard service procedures. Model No. 34788 is a UL-listed, single-pass system that meets SAE specifications for recycled refrigerant. Follow the SAE-J2211 recommended service procedure for the containment of R-134a. The unit includes a 1.5 cfm (42 l/m) Robinair high vacuum pump for fast, thorough evacuation.
Keypad Functions START YES START / YES begins or resumes a function, or answers a query. STOP NO STOP / NO terminates or pauses a function, or answers a query. When the unit is not performing a function, pressing the UP or DOWN arrow key adjusts contrast on the digital display. MENU displays the selection menu. MENU ARROWS are used for scrolling through menu items. AUTOMATIC activates a menu that helps the user set up an automatic recover / vacuum / leak test / charge sequence.
Introduction Menu Functions 1. Press the MENU button on the keypad. 2. Press the UP or DOWN arrow key to scroll through the menu choices shown on the second line of the display : SELECT LANGUAGE VERSION X.XX SELECT UNITS MAINTAIN VACUUM OIL MAINTAIN FILTER REFRIG. MANAGEMENT MANUAL REFILL ADJUST TANK FILL LVL CALIBRATION CHECK SELECT BEEPER TONE SERVICE MENU HOSE FLUSH DISPLAY TANK INFO 3. Press START / YES to make a choice from the menu.
Setup Unpack the Accessory Kit Unpack the accessory kit from the bag, and remove the plastic packaging. The kit consists of • A calibration weight. • Vacuum pump oil, oil filler cap, and tube. CAUTION: R-134a systems have special fittings (per SAE specifications) to avoid cross-contamination with R-12 systems. DO NOT adapt your unit for a different refrigerant — system failure will result.
Setup Set Tank Fill Level The operator may either accept the unit’s pre-set default weight of 15 lbs. (6.8 kg) of refrigerant stored in the internal storage vessel (ISV), or change the amount to accommodate the application. Vacuum Pump Fill Port The unit displays Sight Glass LEVEL: 15.00 LBS. ENTER TANK FILL LVL LIMIT: 4 TO 17 LBS. PRESS START / YES TO SAVE 1. Press START / YES to accept the default amount, or use the keypad to enter a desired amount and press START / YES.
Setup Fill the Internal Storage Vessel (ISV) 1. Press START / YES, and the unit automatically runs a 5-minute vacuum to clear all internal air. Note: The “burping” noise heard during this process indicates air is being purged from the system—this is normal. 2. After the vacuum pump shuts off, connect the fill hose to the liquid connector on a full source tank. Low- and High-Side Hoses 3. Open the source tank valve. 4.
Operating Instructions Recover Refrigerant from a Vehicle 1. Empty the oil drain bottle located on the right-hand side of the unit, if necessary, or make note of the current oil level. See Figure 5. 2. Connect the high- and low-side hoses to the vehicle A/C system. 3. Open the coupler valves on the hoses. 4. Press the RECOVER button. Oil Drain Bottle Note: The clicking noise heard during the recovery process indicates the solenoid is opening and closing — this is normal. 5.
Operating Instructions Evacuate the A/C System 1. Ensure service hoses are connected, and coupler valves are OPEN. 2. Press VACUUM. 3. Press START / YES to accept the default evacuation time of 10 minutes, or enter the desired vacuum time using the number keys, and press START / YES. IMPORTANT: The unit pulls a vacuum on the vehicle A/C system to remove air and boil off moisture that may be present in the system.
Operating Instructions Flushing the Hoses If the next vehicle to be serviced contains a different type of oil than the previous vehicle serviced, the hoses must be flushed of all residual oil to prevent contamination. 1. Press the MENU button on the keypad. 2. Press the UP or DOWN arrow key to scroll to HOSE FLUSH, and press START / YES. 3. Connect the hoses to the unit’s storage port connections (shown in Figure 6), and open the coupler valves. 4. Select START / YES to begin the hose flush process.
Operating Instructions Replenish A/C System Oil Oil may be replenished through the high side after the vacuum function, or with an oil inject tool after charging the vehicle. CAUTION: To prevent damage to equipment, • Use only NEW oil to replace the oil removed during the recycling process. • Charge only the amount of oil that was removed from the A/C system during the recovery process. If no oil was removed from the A/C system during recovery, DO NOT charge any oil into the A/C system.
Operating Instructions Recharge the A/C System 1. Press CHARGE. Press CHARGE again to toggle between a high-side charge, a low-side charge, or both. Blue Light indicates Low-Side Charge Red Light indicates High-Side Charge Note: • Charge mode after injecting oil will allow only a highside charge. • The blue light on the control panel indicates a lowside charge; the red light indicates a high-side charge. See Figure 8. 2.
Operating Instructions Recharge the A/C System contd. The machine charges a small amount of refrigerant into the vehicle A/C system to offset any refrigerant that may be left in the hoses, and then displays DISCONNECT HS HOSE DISCONNECT LS HOSE START TO CONTINUE Follow the prompts on the screen to remove the service hoses from the vehicle and skip to Step 10. 6. Close the high-side coupler valve.
Operating Instructions – Automatic The automatic function allows a user to program an automatic recovery, vacuum, leak test, and / or charge sequence. The user may choose to skip any step in the automatic operation during the programming. A total automatic sequence may take an hour to complete. Note: • Oil recovered during the recovery cycle can be injected by the user before the charge cycle, or can be manually injected into the vehicle after charge using a separate oil injection tool.
Maintenance General Maintenance 1. On a regular basis, wipe off the unit using a clean cloth to remove grease and dirt. 2. Periodically check internal components for leaks; over time, fittings can loosen as the unit is moved. Open the door panel, and trace lines using a leak detector. Check connections on the back of the unit. Tighten any loose fittings or connections you may find. Electrical Protection The unit is equipped with a 15 amp circuit breaker on the back panel. See Figure 10.
Maintenance Tank Fill Hose Filter Service The black tank fill hose at the rear of the machine contains a filter that can be cleaned when it appears that refrigerant flow is restricted. When the machine senses low flow, it may display the following message: • SOURCE TANK EMPTY, but yet you know the source tank contains refrigerant, connections are secure, and the source tank valve is open. The cause may be that the tank fill hose filter is plugged. Cleaning the Tank Fill Hose Filter 1.
Maintenance Replace the Filter-Drier The filter-drier is designed to trap acid and particulates, and to remove water from refrigerant. To meet the SAE J-2788 mandate for adequate moisture and contaminant removal, the filter-drier must be replaced after 150 lbs. (68 kg) of refrigerant has been filtered. Therefore, you no longer have a choice—the filterdrier must be replaced. The unit gives a warning when 100 lbs. of the filter capacity has been used; the unit locks down when the 150 lb.
Replace the Filter-Drier contd. 5. The display reads PLEASE REPLACE FILTER. Open the rear door of the unit and unscrew the old filter. See Figure 13. 6. Look at the new filter—verify both o-rings are lubricated and correctly located in the grooves. See Figure 14. Thread the new filter into place. Press START / YES. FilterDrier Rear View (without shroud) Note: If the display shows SERIAL NUMBER ERROR, the serial number is invalid or the filter-drier has already been used in this unit. 7. Close the door.
Maintenance Change Vacuum Pump Oil Oil Fill Port For maximum vacuum pump performance, change the vacuum pump oil after every 10 hours of operation. (The unit will display a prompt after 10 hours of operation.) 1. Press MENU. Use the arrow keys to select MAINTAIN VACUUM OIL, and press START / YES. The display shows how long the vacuum pump has operated since the last oil change: PUMP OIL TIME X:XX TIME REMAINING X:XX CHANGE OIL? 2. Press START / YES.
Maintenance Adjust Tank Fill Level When connected to a refrigerant source, the unit maintains a default value of 15 lbs. of refrigerant in the internal storage vessel. This value may be adjusted up or down to suit the application. 1. Press MENU. 2. Use the arrow keys to scroll through the menu to ADJUST TANK FILL LVL, and press START / YES. The unit displays LEVEL: 15.00 LBS. ENTER TANK FILL LVL LIMIT: 4 TO 17 LBS. PRESS START / YES TO SAVE 3. Use the keypad to enter a value between 4 lbs. and 17 lbs.
Robinair Limited Warranty Statement Declaración de garantía limitada Robinair Rev. November 1, 2005 Revisión del 1 de noviembre de 2005 This product is warranted to be free from defects in workmanship, materials, and components for a period of one year from date of purchase. All parts and labor required to repair defective products covered under the warranty will be at no charge. The following restrictions apply: 1. The limited warranty applies to the original purchaser only. 2.
Visit our web site at www.robinair.com or call our toll-free Technical Support Line at 800-822-5561 in the continental U.S. or Canada. In all other locations, contact your local distributor. To help us serve you better, please be prepared to provide the model number, serial number, and date of purchase of your unit. To validate your warranty, complete the warranty card attached to the unit, and return it within ten days from date of purchase.
