12 - START-UP
12.1 - Preliminary checks
-
Never be tempted to start the unit without reading fully, and understanding, the operating instructions and without having carried
out the following pre-start checks:
-
Check the chilled water circulation pump operation with the Quick Test function.
-
Check the air handling units and all other equipment connected to the evaporator. Refer to the manufacturer’s instructions.
-
Check the condensing loop water circulation pump operation with the Quick Test function.
-
For units without hydraulic module, the water pump overheat protection devices must be connected in series with the pump
contactor power supply.
-
Ensure that there are no refrigerant leaks.
-
Confirm that all pipe securing bands are tight.
-
Confirm the electrical connections are secure.
-
Avoid a long common power wiring connection run inside the unit close to the control or signal wiring.
-
Observe the clearances on each unit side to facilitate maintenance.
-
The unit pipings are not 100% insulated whatever the options. The insulation only protects against running condensation.
-
To ensure that no condensate can run under the unit, a condensate pan must be added under the unit that collects 100% of the
condensate.
-
If work is required inside a control box or on the compressor wiring, the phase order must be verified with a quick test (refer to
the DYNACIAT LG/LGN Connect’Touch control manual. The compressors cannot support prolonged operation (>30 seconds)
with reversed phases.
-
Ensure that the last refrigerant charge made by the service team corresponds with the charge given on the name plate - otherwise
the operating ranges and the unit efficiency will be impaired. The required tolerance for the charge is ±2%.
-
Do not interchange material with another unit. The elements used for this unit are specific to this unit. Use the specific manufacturer
component list when ordering any parts.
-
Before start-up ensure that the unit is level (1.5 mm/m).
-
Check the operation of the fans in the air-cooled condensers.
12.2 - Actual start-up
-
Commissioning and start-up of the unit must be supervised by a qualified refrigeration engineer.
-
Start-up and operating tests must be carried out with a thermal load applied and water circulating in the
evaporator and condenser.
-
All set-point adjustments and control tests must be carried out before the unit is started up.
Ensure that all safety devices are operational, especially that the high pressure switches are switched on and
that the alarms are acknowledged.
For LGN units operating with a remote air-cooled condenser the compressor oil level must be monitored during
the installation start-up phase.
This ensures that the oil charge from the original compressors is sufficient in relation to the size of the system
and the pipe configuration. Once the oil level has stabilised, it must not be lower than ¼ of the oil sight glass
level for the compressors during operation.
EN-51
Dynaciat LG/LGN
Summary of Contents for DYNACIAT LG 080
Page 1: ...DYNACIAT LG LGN 07 2018 10188 Instruction manual...
Page 2: ...Dynaciat LG LGN EN 2...
Page 3: ...EN 3 Dynaciat LG LGN...
Page 67: ...EN 67 Dynaciat LG LGN...
