Rev. 3 02-2021
73
MTEC.DXi.H/DXi.HF.GB-3 Use and Maintenance technical manual DXi.H/DXi.HF English
Emibyte DXi.H/DXi.HF
Direct expansion close control
If is necessary to measure the temperature, move partially the isolation material from the suction line; the thermo-
meter must be placed in a orizontal section using a suitable paste if necessary in order to improve the measure.
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(5 ÷ 7 °C)
The contact between the probe and teh surface could be improved using a suitable paste.
2) Using the sight glassi s also possible to understand if the refrigerant charge is adequate; normally the charge is good if after 10’ of nomi-
nal functioning there are not steam bubble on the glass.
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T
o measure the refrigerant overheating on the evaporator outlet during the nominal unit operation must be measured:
• Evaporation pressure with a gauge connected to a suitable valve installed on the suction line;
• Suction temperature with a contact thermometer placed on the low pressure line, about to 20cm from the evaporator.
After a long operation break the sight glass color check must be performed at least after 1 hour of nomianl opera-
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The refrigerant overheating is the difference between suction temperature, measured using the thermometer and the saturation one (dew
value) corresponding to evaporation pressure, measured using the gauge
If the hovereating value is lower than 5K or higher than 7K will be necessary act on the thermostatic valve parameters (refers to the cap.
Dedicated) in order to stabilize the value around a 5 ÷ 7 K.
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To measure the refrigerant sub-cooling to the condenser outlet during the nominal unit operation must be measured:
• Condensation pressure using a gauge connected to a suitable valve installed on the liquid line;
•The liquid refrigerant temperature, with a contact thermometer placed to the refrigerant line, on the unit.
The refrigerant sub-cooling is the difference between saturation temperature (bubble value) corresponding to condensation pressure, me-
asured using a gauge, and the temperature of the liquid refrigerant, measured using a thermometer.
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di refrigerante caricato nel circuito per fare in modo che esso si stabilizzi attorno a 5 ÷ 7 K.
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The protection devices against the overcurrents must be controlled in order to verify their operating and integrity.
