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Use vacuum pump
1. Remove the valve caps on the liquid valve and gas valve and the nut of refrigerant charging vent.
2. Connect the charging hos of the piezometer to the refrigerant charging vent of gas valve and then connect
the other charging hose to the vacuum pump.
3. Open the piezometer completely and operate for 10-15min to check if the pressure of piezometer
remains in -0.1MPa.
4. Close the vacuum pump and maintain this status for 1-2min to check if the pressure of piezometer
remains in -0.1MPa. If the pressure decreases, there may be leakage.
5. Remove the piezometer, open the valve core of liquid valve and gas valve completely with inner hexagon
spanner.
6. Tighten the screw caps of valves and refrigerant charging vent.
7. Reinstall the handle.
Leakage detection
1. With leakage detector:
Check if there is leakage with leakage detector
2. With soap water:
If leakage detector is not available, please use soap water for leakage detection. Apply soap water at the
suspected position and keep the soap water for more than 3min. If there are air bubbles coming out of
this position, there is a leakage.
Check after installation
Items to be checked Possible malfunction
Has the unit been installed firmly? The unit may drop, shake or emit noise.
Have you done the refrigerant leakage test? It may cause insufficient cooling (heating) capacity.
Is heat insulation of pipeline sufficient? It may cause condensation and water dripping.
Is water drained well? It may cause condensation and water dripping.
Is the voltage of power supply according to the volt-
age marked on the nameplate?
It may cause malfunction or damage the parts.
Is electric wiring and pipeline installed correctly? It may cause malfunction or damage the parts.
Is the unit grounded securely? It may cause electric leakage.
Does the power cord follow specification? It may cause malfunction or damage the parts.
Is there any obstruction in air inlet and air outlet? It may cause insufficient cooling (heating).
The dust and sundries caused during installation are
removed?
It may cause malfunction or damage the parts.
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