Unit Start-Up; Technical Features - Epta Technica R744 Backup Unit Bedienungsanleitung

Model - Modello - Modèle
Modell
Manufacturer - Fabbricante - Constructeur
Hersteller
8.8

Unit start-up

B
The unit is ready for operation. Do not
open the cover or change the pressure
regulator settings.
PUTTING INTO OPERATION
• Power supply with (230V/1ph/50-60Hz)
• set the main switch to ON
• fill the system with refrigerant R744
The unit will go into Stand-by mode and wait for
an external contact signal to run ("Fig. 10").
The external digital input contact n.a. 24V ("Fig.
11") can be used to:
• activate the unit
• check that the unit is working properly
L
To put the unit into operation, the digital
external input contact n.o. 24V can be
used to connect a manual switch or a
relay in stead of the pressure switch.
PRESSURE ADJUSTMENT
For systems operating with p
• activation a 40bar
• decommissioning at 35bar
For systems operating with p
• activation a 48bar
• decommissioning at 43bar
The pressure regulator will start operating,
showing the frequency on the display.
The fan will then start blowing air into the
compressor area.
Doc. n° UM000863 | Rev. "A" | 17/06/25
R744 BACKUP UNIT
Epta Spa - Via Mecenate, 86 - 20138 Milano (MI) ITALIA
Tel. 02/55403211 Telefax 02/55401023
=45bar
s
=60bar
s
START-UP AND SHUTDOWN
• Power supply with (230V/1ph/50-60Hz)
• set the main switch to ON
The unit will go into Stand-by mode and wait for
an external contact signal to run ("Fig. 10").
L
The pressure regulator adjusts the
maximum pressure up to 90bar, with a
frequency limit of 150Hz.
B The risk of delivery overpressure is
prevented withby a safety valve with
p =120bar, which manages the full
s
mass flow rate of the compressor.
The position of the safety valve is shown in "Fig.
12".
8.9

Technical features

The technical data for the unit are listed in
"Technical features"the table"Chart IV".
User manual
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