M06K40A18-00 CKN-XHE2i 7.1-14.2 21
7.4 Refrigeration circuit
1. Check carefully the refrigerating circuit: the presence of oil stains can mean leakage caused by transportation, movements or other).
2. Verify that the refrigerating circuit is in pressure: Using the unit manometers, if present, or service manometers.
3. Make sure that all the service outlets are closed with proper caps; if caps are not present a leak of refrigerant can be possible.
4. Open the valves of the refrigerant circuit, if there are any.
7.5 Water circuit
1. Before realizing the unit connection make sure that the hydraulic system has been cleaned up and the cleaning water has been drained.
2. Check that the water circuit has been lled and pressurized.
3. Check that the shut-o valves in the circuit are in the “OPEN” position.
4. Check that there isn’t air in the circuit, if required, evacuate it using the air bleed valve placed in the system high points.
5. When using antifreeze solutions, make sure the glycol percentage is suitable for the type of use envisaged.
Neglecting the washing will lead to several lter cleaning interventions and at worst cases can cause damages to the exchangers and the
other parts.
Weight of glycol (%) 10 20 30 40
Freezing temperature (°C) -3.9 -8.9 -15.6 -23.4
Safety temperature (°C) -1 -4 -10 -19
7.6 Electric Circuit
Verify that the unit is connected to the ground plant.
Check the conductors are tightened as: the vibrations caused by handling and transport might cause these to come loose.
Connect the unit by closing the sectioning device, but leave it on OFF.
Check the voltage and line frequency values which must be within the limits: 400/3/50 +/- 10%
Check and adjust the phase balance as necessary: it must be lower than 2%
Example
Working outside of these limits can cause irreversible damages and voids the warranty.
7.7 Compressor crankcase heaters
Power the heating elements of the compressor oil for at least 12 hours before the compressor starts:
•
at the rst unit start-up
•
after each prolonged period of inactivity
1. Supply the resistances switching o the unit isolator switch.
2. The heating elements activate with an outdoor temperature below 3°C.
3. To make sure that heaters are working, check the power input.
4. At start-up the compressor crank-case temperature on the lower side must be higher at least of 10°C than the outside temperature.
Do not start the compressor with the crankcase oil below operating temperature.
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