Refco PRV-2000 Mode D'emploi page 8

8. Pressure and leak-tightness tests
• Connect the pressure regulator (2) as described under "7.1 Pressure regulation".
• Then connect the charging hose to the pressure regulator connection.
• Connect the other end of the charging hose (5) (45° bend) to the marking gauge
(connection to tap 12).
• In this process, ensure that the tap (12) is closed. The yellow handle must be pointing
towards you.
• Then tighten the connection (13) on the respective refrigeration circuit.
• Now open the gas cylinder valve slowly. The primary gauge (9) will be indicating the
cylinder pressure.
• Then open the yellow tap (12) on the marking gauge. The tap will now be pointing in
the direction of the hose.
• Turn the handwheel (8) clockwise to set the required pressure. The pressure being
tested depends on the required refrigerant in the refrigeration circuit. See table:
9. Refrigerants and their test ranges
Refrigerant Pressure
R134A 18-22 bar
R404A 28-32 bar
R407C 28-32 bar
R507 28-32 bar
R22 28-32 bar
R410A 38-42 bar
• If the correct pressure range has been set, mark the pressure indicator on the
gauge (4). To do this, move the red marker precisely over the pressure indicator
on the gauge.
• Wait for approx. 20 seconds. If the marking indicator and the gauge indicator are
still covering one another, you can close the yellow tap on the marking gauge and
remove the charging hose.
• The marking gauge (4) is now connected to the refrigerant circuit at the required
pressure.
• The test duration depends on the size and type of the refrigerant circuit. If the
marking indicator and the gauge indicator are still covering one another after the
test time has elapsed, the refrigerant circuit is without leaks. If the pressure
indicator has dropped below the marking indicator, the refrigerant circuit is leaking.
10. Washing and blowing out
• Position a sufficiently large bucket underneath the outlet of the refrigerant system,
and open it.
• Then connect the pressure regulator (2) as described under
"7.1 Pressure regulation".