10.3 - Essential points to check
Compressors
Ensure that each compressor is rotating in the correct direction,
checking that the discharge temperature rises quickly, the high
pressure increases and the low pressure drops. If it is rotating in
the wrong direction, the power supply is incorrectly wired (reversed
phases). To ensure rotation in the correct direction, swap two
power supply phases.
■ Check that the power cables are tightened securely in the
terminal unit for each compressor.
■ Check the compressor discharge temperature using a contact
sensor.
■ Check the input current; it should be normal.
■ Check all safety devices to make sure they operate correctly.
Hydraulic
As the exact total system pressure drop is not known at start-up,
adjust the water ow rate with the control valve until the desired
nominal rate is obtained.
Please refer to the chapter “Nominal system water ow rate
control - Procedure for adjusting the ow rate” for the steps to
follow.
In any case, the hydraulic circuit must be free from pollution
(removal of any solid particles in the circuit) before start-up: Please
refer to the chapter “Nominal system water ow rate control -
Procedure for cleaning the hydraulic circuit” for the steps to follow.
Refrigerant charge
Each unit is shipped with an exact charge of refrigerant and oil.
Check that there are no visible refrigerant or oil leaks:
■ No apparent damage on the refrigerant circuit pipes
(no trauma, cracks, deformation)
■ No traces of grease on the connections and refrigerant circuit
sensors
In case of doubt, use a refrigerant leak detection device suited to
the uid in the unit.
10 - SYSTEM START-UP
57
To Next Page
Loading...
Need help?
General