91
User manual
Hydrobox module AQMS80X1i
EN
PART 2. INSTALLATION MANUAL
6. Close the Low Pressure side of the manifold gauge, and turn off the vacuum pump.
7. Wait for 5 minutes, then check that there has been no change in system pressure.
8. If there is a change in system pressure, refer to Gas Leak Check section for information on how to check for
leaks. If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve).
Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning the
wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve after 5 seconds.
9. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The Pressure
Gauge should read slightly higher than atmospheric pressure.
10. Remove the charge hose from the service port.
11. Using hexagonal wrench, fully open both the high pressure and low pressure valves.
12. Tighten valve caps on all three valves (service port, high pressure, low pressure) by hand.
You may tighten it further using a torq wrench if needed.
Flare nut
Cap
valve body
valve stem
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. Do not try to force the
valve to open further.
8.3. Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, in North America, the standard pipe length is 7.5m (25’).
In other areas, the standard pipe length is 5m (16‘). The refrigerant should be charged from the service port
on the outdoor unit’s low pressure valve. The additional refrigerant to be charged can be calculated using the
following formula:
