Mastercool 69788-A R134a RECOVERY_RECYCLE_RECHARGE - Manual (Page 12)

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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, eliminating the chance of NCGS being charged to the AC system.
The machine will automatically go on to running the vacuum phase for the preset time. Upon completion of the vacuum phase, the machine will stop,
emit a beep, and display:
OIL INJECTION
Press Start to continue
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 the following dialog boxes:
END OF CHARGE
CLOSE HIGH AND LOW
VALVES ON MACHINE
START: TO CONTINUE
START ENGINE
TURN ON A/C SYSTEM
START: TO CONTINUE
CHECK HIGH AND LOW
A/C SYSTEM PRESSURES
START: TO CONTINUE
CLOSE HIGH PRESSURE
COUPLER
START: TO CONTINUE
OPEN HIGH AND LOW
VALVES ON MACHINE
TURN ON A/C SYSTEM
START: TO CONTINUE