Hydraulic Connections (Fig. 6); Startup And Adjustment - Arneg HP3 Guia De Instalacion

HP3
English
- The system should be protected upstream using an automatic thermomagnetic omnipolar cut-off
switch with appropriate characteristics and that also serves as the general circuit breaker for the line.
- Inform operators of the switch location so that it can be reached quickly in the case of an
EMERGENCY.
- The electrical system must be grounded using the terminal located on the side of the circuit
breaker and marked with:
- First of all, make sure that the power supply voltage is that indicated on the rating plate (Fig. 2)
- Check that the power supply line has cables with the cross section recommended by the
manufacturer, and are protected against power surges and have a grounding system that conforms to
the laws in effect.
- For power supply lines longer than 4-5 m, increase the cable cross section correspondingly.
- The installer should provide anchoring devices for all cables entering and leaving the unit.
- Respect the wire colours and the phase order.
The automatic thermomagnetic switch should be designed so as to not open the neutral circuit
without simultaneously opening on the phases. In any case, the the opening distance for the
contacts must be at least 3mm.
Pay attention to the cutoff value of the differential so as to guarantee selectivity.
N.B.All these operations should be performed by specialized technical personnel only.

13.Hydraulic connections (Fig. 6)

The unit is provided with outgoing tubes.
- After having positioned the unit, set up the connections for the machine circuits using tubing that is
appropriate for the connected refrigerating power.
- The unit connectors are provided with copper tubing in appropriate dimensions, closed by a braze
welded plug. Remove the plug and connect the system line to the unit using bell-mouth braze
welding.
- Insert anti-vibration joints and interception valves of appropriate dimensions between the unit and the
system tubing.
- Weld the tubes very carefully.
- Before filling the circuit with the refrigerant, carefully clean the internal parts and test the pressure in
the lines.
- Place the system under pressure using nitrogen, so as to check the seal.
- Each unit is inspected before deliver at a pressure of 7.5.
N.B.All these operations should be performed by specialized technical personnel only.

14.Startup and adjustment

Putting the system under a vacuum
Use of a "High Vacuum" pump and a vacuum meter is required, as indicated in the instructions
IQSPV007. Do not use the refrigeration system compressors to create the vacuum.
- For all the refrigeration systems, connect the "High Vacuum" pump on the high pressure side and the
low pressure side.
- Make sure that mechanical parts (e.g. taps) and electrical parts (e.g. solenoid valves) are completely
open and that air flow is not obstructed in any way in the unit.
- When the vacuum meter indicates a pressure of 1.5 mbar, stop the vacuum pump.
- Six hours after stopping the vacuum pump (the time necessary for the system to stabilize itself), take
note of any pressure developments for at least 24 hours.
CAUTION! If at the beginning the pressure rises regularly and then stabilizes at a value that
corresponds to the saturation tension of the residual water at room temperature, this means
that the system is sealed but still contains some water. If instead the pressure does not
stabilize but increases, this means the system not only contains water, but is also not sealed. In
both cases, the operation must be repeated, and the leaks must be eliminated. If over the
course of 12 hours pressure does not exceed 0.5 mbar, the system can be considered dry and
perfectly sealed.
N.B.This value is valid for any system volume. It is a mistake to think that for large volumes
values that exceed 0.5 mbar are acceptable.
N.B.All these operations should be performed by specialized technical personnel only.
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05060114 00 09/07/2010