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RAU-SVX01G-GB
General start-up
– Check fi xing of capillary tubes (protection from vibration and from wear) and insure that they are not damaged.
– Reset all manually set control devices.
– Check refrigerating circuits tightness.
– Check oil acidity.
– Check electrical terminals tightening of the motors and in the control panel.
– Check the isolation of the motors using a 500V DC megohmeter which meets manufacturer’s specifi cations
(minimum value 2 megohms).
– Check the direction of the rotation using phasemeter.
Electrical power wiring:
– Check all the electrical terminals tightening.
– Set-up compressors overload relays.
– Set-up fan-motors overload relays.
Electrical control wiring:
– Check all the electrical terminals tightening.
– Check all the pressostats.
– Check and set-up the control module.
– Test and start-up without the electrical power.
Condenser:
– Check setting of the safety pressure valve.
– Check direction of the rotation of fans.
– Check the isolation of the motors using a 500V DC megohmeter which meets manufacturer’s specifi cations
(minimum value 2 megohms).
Operating parameters statement:
– Switch on main power supply switch.
– Start-up the unit by pushing auto on the control module screen.
– After unit start up, leave in operation for at least 15 minutes, to insure pressures are stabilized.
Then check:
– voltage.
– compressors and fan-motors currents.
– suction temperature and pressure.
– ambient air temperature.
– blowing air temperature.
– discharge pressure and temperature.
– liquid refrigerant temperature and pressure.
– operating parameters:
– superheat: difference between suction temperature and dew point temperature. Normal superheat must be within
5°C and 10°C.
– sub-cooling: difference between liquid temperature and bubble point temperature. Normal sub-cooling on
standard unit with R134a should be 5 to 10°C, and 2 to 5°C with 407c.
– difference between dew point temperature in high pressure and condenser air inlet temperature. Normal value on
standard unit with R134a and all the fans operating should be 15 to 18°C. With 407C, it should be 20 to 23°C.
Final check:
When the unit is operating correctly:
– Check that the unit is clean and clear of any debris, tools, etc…
– All valves are in operating position.
– Close control and starter panel doors and check panels fi xation.
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