GM-820A-Dual A/C SYSTEM MAINTENANCE CENTRE-DUAL
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C-1: Connect the HP & LP ports of the equipment with the HP & LP ports of the MM. Pay attention to
the type of refrigerant.
C-2: Select Empty Internal Refrigerant function and press ENTER key.
C-3: Confirm the pipes connected well, and press ENTER key.
C-4: Run Recovery function of MM.
C-5: After recovery end, stop and power off the MM. And then press ENTER key to the next step.
C-6: Wait for a moment. When it shows END, the pipes connected with two equipment can be
disconnected.
C-6: Run the Vacuum System Pipeline function.
Warning: this function is performed according to the type of refrigerant.
12-6) Vacuum System Pipeline
Through this function, the internal pipeline of the equipment can be completely vacuumed to the factory
state.
Before run this function, it must do the Empty Internal Refrigerant function.
Operations:
C-1: Power on, select refrigerant type, then select Equipment Maintenance.
C-2: Select Vacuum System Pipeline function and press ENTER key.
C-3: Connect the hoses and couplers well to the coupling side of the equipment, and open the
couplers.
C-4: And then press ENTER key to run.
Warning: this function is performed according to the type of refrigerant.
12-7) Change vacuum pump oil
A. When the pump oil became cream or machine display maintenance message, the vacuum pump oil
must be changed.
B. If not change the pump oil in time, the vacuum pump will be easily damaged.
C. Operations:
C-1: Open the back-down cover.
C-2: Unscrew the block of the drain port to drain the old oil out entirely. Then re-back the block to the
drain port.
Note: the oil drain hole is on the same side of the window or at the bottom. There are some differences
in specifications.
C-3: Unscrew the cap of the fill port and then fill the new oil slowly into the vacuum pump until the oil
level reach at the center site. Then re-back the cap to the fill port.
Window
Drain port
Fill port
