Controls And Adjustments; Steady-Pressure Backup System - Arneg SR2 Guía De Instalación Y Manejo

Load
Step
procedure
1
2
3
4
5
6
7
8
Inconvenien The liquid flows back, the compressor is faulty, the recharge flow rate is too high
due to liquid back-flow.
ces
- make sure the compressor discharge temperature is abote 50°C and the
temperature of oil cup is 10K higher than the evaporation temperature.
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The components of the circuit are not accessible.
For any intervention, please contact the authorised technical support centre of ARNEG.
The system may overload when the condensation temperature is low (e.g. during
winter). Check that the undercooling of the fluid coming out from the capacitor is of
about 5K During summer you must also check the load.

16. Controls and adjustments

16.1. Steady-pressure backup system

In this chapter we will indicate the values that activate the steady-pressure backup system.
The red indicator light on the electrical cabinet (Fig. 9) turns on when the steady-pressure
backup system is enabled.
If the light is lit, call the technical support!
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The setpoints are set in the factory
Panel
Pos.
(Fig. 8)
1
2
3
4
5
6
7
8
9
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depressurise the pipe that connects the refrigerant gas cylinder and the
system
connect the refrigerant gas cylinder to the high pressure circuit through
a coupling placed between the capacitor and the liquid reserve
load the refrigerant through the cylinder liquid phase connection.
DO NOT overturn the cylinder
connect the liquid phase of the cylinder to the intake line connection.
the connection pipe must contain the refrigerant fluid
turn on a compressor to reduce the pressure within the intake circuit
open the cylinder valve and complete the loading procedure.
if the gauge (Fig. 12) that detects the liquid coming out from the liquid
receiver is full, it means that load is completed.
Press the switch on the electrical cabinet to start the refrigeration
system (Fig. 9)
Condensation control pressure switch
Backup main pressure switch
Compressor control pressure switch I
Compressor control pressure switch II
Compressor control pressure switch III (optional)
LP transducer
HP transducer
LP pressure gauge
HP pressure gauge
pressure switches 3-4-5 work as safety low-pressure pressure
switches (turn off the compressors if the pressure is too low)
Action
Description
SR2-SR3
English
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