Refrigeration Circuit; Electric Circuit - CLIVET MSAT-XEE8.2 Manuel D'installation, D'utilisation Et D'entretien

6.4 Refrigeration circuit

Correct compressor rotation direction
WARNING EXCESSIVE NOISE INDICATES THAT THE DIRECTION OF ROTATION IS NOT CORRECT
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Connect a pressure gauge on the high pressure side
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Check that the operation of the compressor leads to an increase in pressure on the high pressure side
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No variation in pressure means that the direction of rotation is not correct
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Stop the compressor
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Reverse the connection of a pair of phase wires
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Restart the compressor
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Check the variation in pressure on the high pressure side
Check carefully the refrigerating circuit: the presence of oil stains can mean leakage caused by transportation, movements or other).
Make sure that all the service outlets are closed with proper caps; if caps are not present a leak of refrigerant can be possible.
Refrigerant circuit parameter
Detecting the operational conditions is useful to control the unit along time: the performed records must be kept and be available during
maintenance interventions.
With unit at steady state, i.e. in stable and close-to-work conditions, identify the following data:
1. Compressor diacharge temperature (WARNING – BURN DANGERI)
2. Condensation pressure
3. Liquid temperature
4. Dehydrator filter upstream and downstream temperature
5. Return pressure
6. Return temperature
7. Fresh air temperature (coil input)
8. Air temperature coming out from fans

6.5 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.
6.6 Compressor crankcase heaters
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 heaters 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.
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