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Functions
Self Test
Perform this test to ensure the high pressure
cutoff and pump are operational
1. Set knob to RECOVERY.
2. Open IN port to air.
3. Connect a ball valve to OUT port. (Included caps are not sealed.)
4. Close the ball valve.
5. Press START to create a pressure at the OUT port.
6. MR45 is working well if High Pressure Cutoff occurs around 550 psig
within 45 seconds. Cutoff time can increase if a hose is placed in
front of your ball valve.
Self Purge
Use the SELF PURGE feature at the end of every
recovery to pump the last bit of refrigerant out
of MR45 Benefits include increased machine
life, reduced environmental impact, and most
importantly to prevent refrigerant mixing
1. After recovery is complete, set knob to SELF PURGE. This closes the
IN port and routes the MR45 condenser to the intake of the MR45
compressor.
2. Press START to empty MR45 into the recovery cylinder.
3. Once 10”Hg is reached for 10 seconds, the motor stops
automatically.
Purging a Recovery Cylinder
When the cylinder pressure is higher than
expected you may have non-condensables at the
top of the cylinder Use a second deeply evacuated
cylinder to pull out the non-condensables
1. Leave pressurized cylinder undisturbed overnight.
2. Use a vacuum pump to evacuate another cylinder.
3. Use your manifold gauges to connect the closed vapor ports of the
two cylinders.
4. Measure the vapor temperature of the pressurized refrigerant
cylinder.
5. Use a P/T chart or digital manifold to find specified pressure.
6. Open the evacuated vapor port.
7. Open (purge) the pressurized vapor port until pressure is reduced to
5 psi above specified pressure.
8. Close valves.
9. If desired, repeat in 15 minutes to allow the tank to settle again.
