Mastercool 69788 RECOVERY_RECYCLE_RECHARGE - Manual (Page 12)

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At this point, 69788 will pause and give the operator an opportunity to inject oil. If oil is needed, open the NEW oil valve and add the needed quantity.
When completed, close the NEW oil valve and press START to go on to charging the quantity of refrigerant set previously. If no oil is to be injected,
then press START.
NOTE: It’s very important to remember to CLOSE the new oil valve before pressing the START button. Failure to close the valve will result in the
refrigerant over pressurizing the NEW oil bottle and possibly causing the bottle to rupture.
NOTE: Using PAG oil or tracer in hybrid vehicles may damage the compressor. Use only suitable oil with a separate oil injection device.
NOTE: Charging may not run to completion due to pressure balance between the internal refrigerative storage tank and the A/C system. If this occurs,
close the high pressure valve (leaving the low-pressure side open), start the vehicle and switch on the A/C system. The unit is equipped with a tank
heater to limit this occurrence. When the charging operation is complete, the machine will display:
END OF CHARGE
Close HP and LP
Press START to continue
Close the high and low service valves. Start the vehicle engine and the A/C system and allow both to run for at least 3 minutes. At this point the
system will be at a steady state and it will be possible to check the high and low pressure valves on the relative pressure gauges. Close the valve
on the high-pressure (RED) quick-connect coupling. Then, with the A/C system still running, open the high and low service valves to enable the A/C
system to evacuate the refrigerant contained in the hoses. When the high and low side pressure is equal, close both service valves and the valve on
the low side coupling. Then disconnect the low and high pressure coupling from the vehicle A/C system and switch off the engine.
ASSISTED PROCEDURE
RECOVERY AND RECYCLING
Connect the hoses to the A/C system with the quick-connect couplings, bearing in mind that BLUE must be connected to the low-pressure side and
RED to high pressure. If the A/C system is equipped with a single quick-connect coupling for high or low pressure, connect only the relative coupling
and hose. Check that the high and low pressure valves are closed. Start the vehicle engine and the air conditioner and allow both to run for 5 to 10
minutes with the passenger compartment fan at full speed. Only perform this step if the vehicle’s AC is operational. Switch off the vehicle engine.
Select the assisted procedure by pressing ENTER when “Assisted Procedure” flashes on the LCD. Select recovery and recycling by pressing ENTER
when “Recovery/Recycling” flashes on the LCD.
Open the high and low service valves on the machine and press the START key to begin the refrigerant recovery/recycling phase, which will be
indicated on the LCD as “Recovery/Recycling”. During this phase, the LCD will display the quantity of refrigerant recovered. Upon completion of
recovery, the machine will stop and automatically discharge the used oil extracted from the A/C system during the recovery phase. The oil discharge
operation lasts 4 to 12 minutes depending on the ambient temperature. The words “Recovery/Recycle” will flash while the oil is being discharged.
If any residual refrigerant is left in the A/C system, as indicated by an increase in pressure during the oil discharge phase, recovery will automatically
restart.
NOTE: Stopping the recovery phase before the oil is discharged may damage the recovery/recycle machine’s compressor.
Upon completion of discharge, the machine will check for the presence of air in the tank, and if it’s necessary, purge the non condensable gases.
The alarm will sound continuously and the display will show:
AIR PURGE
Recovery ref x: xx lb
Tp: xx psi T: xx ˚F
The recovery/recycle machine will automatically purge non-condensable gases (NCGS) if excess NCGS are detected at the end of recovery. Allow
the unit to complete this procedure to reduce the risk of comebacks that can be caused by charging excess NCGS into an A/C system.
VACUUM
Use the quick-connect couplings to connect the hoses to the A/C system, bearing in mind that BLUE must be connected to the low pressure side
and RED to high pressure. If the system is equipped with a single quick-connect coupling for high or low pressure, connect only the relative hose.
Select the assisted procedure by pressing ENTER when “Assisted Procedure” flashes on the LCD. Select the vacuum operation, when the message
“Vacuum xx min.” flashes on the LCD. Set the vacuum time only if different from that previously used. Press ENTER to confirm. Open the high and
low pressure valves of the machine and press START.
ADDING NEW OIL (Fig. 10)
Measure the quantity of oil extracted from the A/C system and check that the new oil container contains at least .67 oz (20 cc.) With the A/C system
in vacuum, open the high and low pressure valves of the machine (if the A/C system is equipped with a single quick-connect coupling for high or low
pressure, open only the relative valve). Open the oil valve until the quantity equal to the quantity of oil previously extracted is transferred. Close the
oil valve when reaching the desired oil level.
ATTENTION: Since the oil in the container will decrease in level, the quantity must be calculated by difference. Upon completion of the oil injection