Start-Up Operations; General Information - Profroid QUIETOR GQH ZB190 T5TWIN H N P Notice D'instructions

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Evaporating pressure control
This control is carried out by a low pressure switch.
During rise pressure, this pressure engage and induce the starting of compressor if the safety line is closed.
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Condensing pressure control
This control is carried out by a fan speed control which can cut or fluctuate fan power supply (see operating instructions of the fan speed
control).
ELECTRONIC REMOTE CONTROL (option)
Remote control for unit with electronic room control.
Temperature regulation sensor to be placed
on the air inlet of the evaporator.
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START-UP OPERATIONS

PRELIMINARY CHECKS AND OPERATIONS
 General information
Ensure that all the threads are fully tightened on connection flanges, flexible connections and cables as jolting during transport could
cause screws and bolts to loosen.
Check also, for same reasons, if there are any breaks in the piping.
Ensure that the flexible connections are not in contact with metal parts. Vibrations from the compressor can cause wear in these until
they rupture at the point of friction.
Switch on crankcase heaters 24 hours before start-up.
Check that the condenser fans turn freely.
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Operating instructions
During all operations, the following operating instructions must be followed:
- Unit door must only be opened after the main switch is cut-off and the fans have completely stopped.
- The safety HP and LP switches, fans speed control and control LP switch can be accessed when the door is opened.
- Then, access to pressure plug for connecting the pressure gauge is possible. Pressure gauge cables go across holes on the housing.
Following this operating mode allows unit tests to be carried out with the door closed, ensuring operators' safety as well as the correct
running of thedevice.
 Determining the compressor rotation direction
Important:
Scroll compressors only have one rotation direction. Any rotation in the opposite sense may lead to a compressor
destruction.
During the first start up, it is absolutely necessary to determine the phases connections to compressor terminals. That handling must be
tactful with hermetic compressors and must be extremely fast (less than 1 second).
- Place a LP pressure gauge at the schraeder valve of LP pressure switch.
- Start up the compressor with the start button
- As soon as it is started, stop the compressor (this handling must take some seconds)
- During that time, if the pressure gauge showed that the pressure went down, the rotation direction is correct.
- In the opposite case, invert the 2 phases on the compressor breaker and repeat the same operation for checking.
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Leaks testing
Pressurise the whole system, including the condensing unit, using a neutral gas (Nitrogen) with a (non-liquid, non-colouring) tracer, at a
minimum pressure of 10 bars and at a maximum pressure of less than 20.5 bars, isolating the LP (low pressure) switches.
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during maintenance
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