Pag. 24-EN UMT/WG T MT Rev3.0 – 08/10/2021
the pressure monitored installing a
pressure gauge in the liquid service port
5. Shut off the sealed ball valve 99
6. Remove the installed safety valve 145 and
replace with new one (apply PTFE - Teflon
tape on the valve thread)
7. Open the ball valve 99 and be sure to
re-apply a new metal seal while the
valve is in “open” position
8. Check for leaks on the safety valve with
soapy water
9. Reinstall the panels
10. Switch on the main isolator and restart
the unit and refrigerators
Option 2 (available on-demand as spare part.
Only for unit with 8L receiver): 2 pressure relief
valves connected via a 3-way changeover valve
With this option, the replacement procedure will
be quicker.
1. Close the evaporator valves and wait the
compressor switches OFF by pump down
2. Turn off the unit via the keypad and main
isolator when the unit stops
3. Remove the top panel and frontal panel
(with the GC fan) to easily access to the
receiver compartment
4. Through the changeover valve disconnect
the PRV valve you need to replace
5. Replace the PRV valve with new one
(apply Teflon tape on the valve thread)
6. Through the changeover valve connect
again the PRV valve has been replaced
7. Check for leaks on the safety valve with
soapy water
8. Reinstall the panels
9. Switch on the main isolator
10. Restart the unit and refrigerators
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