10 - SYSTEM START-UP
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 HP
increases and the LP drops. If it is rotating in the wrong direction,
the electric power supply is incorrectly wired (reversed phases).
To ensure rotation in the correct direction, swap the two power
supply phases.
-
Check the compressor discharge temperature with a contact
sensor
-
Check the input current; it should be normal
-
Check all safety devices to make sure they operate correctly
Hydraulics
The exact total drop in system pressure will not be known at
commissioning. It will therefore be necessary to adjust the flow
of water with the control valve until the desired nominal rate is
obtained.
By causing the pressure in the water system to drop, this control
valve aligns the system pressure/flow curve with that of the pump
so that the nominal flow rate corresponding to the desired
operating point is obtained. The pressure drop in the water
exchanger (read using the pressure gauge placed on the
exchanger inlet and outlet) is the reference to be used to check
and adjust the nominal flow rate of the system.
Follow the procedure described below:
-
Open the control valve completely
-
Let the pump run for two hours to flush out any solid particles
in the circuit
-
Read the pressure drop in the water exchanger when the
pump is turned on and then two hours afterwards
-
If the pressure drop has decreased, this means that the screen
filter is clogged. It must be removed and cleaned
-
Repeat until the filter is completely clean
-
If the system pressure drops are above the available static
pressure delivered by the pump, the resulting water flow rate
will be low and the difference in temperature between the
exchanger inlet and outlet will be too high. This is why pressure
drops must be minimised. Check that this difference is within
the values on the curve (refer to section "Water type heat
exchanger min. water volume and flow rate")
Refrigerant charge
Each unit is shipped with an exact charge of refrigerant.
EN-45
AQUACIAT
POWER
ILD
