Electrical Installation; Technical Data - Rivacold Mx Betriebs- Und Wartungsanleitung

5. 12 Pressure switches
• All machines are equipped with HBP safety pressure switches set at max. 28 bar.
• LBP safety pressure switches are set according to the gas in use and the compressor application. We
recommend using the value stated in the following table:
UK
LBP Application MBP
(medium temp.)
LBP Application LBP
(low temp.)
5. 13 Pressure relief valves on the liquid receiver
•
The machines in risk "category 0" are not equipped with pressure relief valves.
•
The machines in risk "category I" are equipped with a fusible plug. The machine must not be
charged with more than 10 kg of gas.
• The machines in risk "category II" are equipped with pressure relief valves.
The risk category of each model is stated on its identification label.
5. 14

Electrical installation

The electrical installation must be performed by qualified staff with the relevant technical skills
according to the requirements of the country where the machine is installed.
• Fit a thermomagnetic switch with a type-C intervention curve (10-15 In) between the power supply
line and the machine-board electrical panel and make sure that the mains voltage corresponds to
the voltage stated on the machine label. The permitted tolerance is ± 10% of rated voltage. When
sizing the differential thermomagnetic switch, take into account the electrical input values stated on
the label.
•
Please note: the thermomagnetic switch must be placed next to the machine so as to be easily seen
and reached by a technician in case of maintenance.
• The section of the power supply cable must be adequate for the power absorbed by the
condensing unit, which is stated on the relevant label fixed to the machine itself.
•
The law requires that the unit be earthed; therefore, it is necessary to connect it to an efficient
earthing system. No liability whatsoever can be accepted in the event of failure to comply with this
requirement or if the electrical system to which the machine is connected does not comply with the
regulations in force.
•
For machines with three-phase motor-driven fans, it is necessary to check the rotation direction of
the motor fans. If it does not correspond to the one shown by the arrow on the label placed near
the fans, it is necessary to switch off the machine and invert two phases of the mains; it is then
possible to re-start the machine.
•
A mechanical thermostat set at 40°C must be fitted to the evaporator; this will deactivate the
heaters in case of overheating. The thermostat bulb must be placed in the fin assembly in the
highest position inside the evaporator.
6.

TECHNICAL DATA

All MX condensing units are supplied in nitrogen pressure. They are provided with safety pressure
switches with a variable setting on the HBP and LBP line.
The refrigerating diagram of a condensing unit with air-cooled condensation has been included here
below:
• Drawing 6: refrigerating diagram of a condensing unit
• Refrigerating diagrams for non-standard units will be attached. These contain all parts which form
the condensing unit.
Gas °C=[bar]
R404A -25°C=1.5 bar
R404A -46°C=0
Set
3 bar
bar 3 bar
MX SX Pag. 16 REV. 14 11/05
Differential
1.5 bar
3 bar