CLIVET WSAN-XIN 21-141, Инструкция по установке и эксплуатации, Страница: 22 / 72

22 WSAN-XIN 21-141 M0R940E13-00
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 cocks of the refrigerant circuit, if there are any.
7.5 Refrigerant circuit
1. Before realizing the unit connection make sure that the hydraulic system has been cleaned up and the clearing water has been drained.
2. Check that the water circuit has been filled and pressurized.
3. Check that the shut-off 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.
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 tightening: the vibrations caused by handling and transport might cause loosing.
Feed the unit by closing the sectioning device, but leave it on OFF.
Controllare i valori di tensione e frequenza di rete, che devono essere entro i limiti:
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400/3/50 +/-10%
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230/1/50 +/-10%
Control the unbalancing of the phases: it must be lower than 2%
Example:
The working out of the limits can cause irreversible damages and voids the warranty.
7.7 Compressor crankcase resistances
Connect the oil resistances on the compressor crankcase at least 8 hours before the compressor is to be starter:
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at the first unit start-up
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after each prolonged period of inactivity
1. Supply the resistances switching off the unit isolator switch.
2. To make sure that hte resistances are working, check the power input.
3. 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.
7.8 Voltages
Check that the air and water temperatures are included in the operating limits.
Start-up the unit.
With operating unit, i.e. in stable conditions and next to the operating ones, check:
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Voltage
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Total absorption of the unit
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Absorption of the single electric loads