FläktGroup Row-DENCO DRC 020, Руководство по эксплуатации

Страница: 58 / 92

Commissioning and Testing Row -DENCO
58 FläktGroup DC-2014-0106-GB 2019-02/R3 • Subject to modifications
Fig. 10-1: Pressure rise after evacuation
10.2 Charging
R-410A The plant is only approved for operation with the refrigerant R-410A. The R-410A is a
zeotropic mixture consisting of three different refrigerants. Since this mixture shows a
defined composition only in the fluid-state, it may only be filled with liquid R-410A.
•
Use the service port of the liquid line to charge liquid refrigerant in each refrigeration
circuit of the unit.
The refrigerant volume for charging or its approximate calculation is provided in the
Data&Facts catalog of the relevant unit series.
To avoid overcharging, first charge around 80 % of the calculated volume. Use the
liquid refrigerant to fill each liquid line of the unit refrigeration circuit.
•
After breaking the vacuum with a liquid refrigerant, all shut-off valves of the unit must
be opened.
During the function test and for topping up the refrigerant, observe the liquid flow
through the liquid line sight glass to receive an overall picture.
•
Check for bubble-free flow in the sight glass!
10.3 Preparing for first start up
Before starting up the condensing unit, make sure that:
– all safety conditions have been respected
– the condensing unit is adequately fixed to the surface it rests on
– clearances have been respected
– refrigerant connections have been carried out as indicated in the instruction manual
– the circuit has been emptied
– the refrigerant circuit valves are open
– electrical connections have been carried out correctly
– voltage is within a tolerance of 10% of the rated voltage for the unit
0
0,002
0,004
0,006
0,008
0,01
0,012
0,014
0,016
0,018
0 5 10 15 20 25 30
1
3
2
Time [h]
Pressure rise after evacuation
Absolute pressure
[bar]
Humid and leaking
Humid and leak-free
at Ta = +10 °C
Dry and leak-free
Danger of low temperature and high pressure!
When charging a refrigeration system with a refrigerant, there is a risk of injury from
contacting liquid refrigerant or fluids/gases escaping at high pressure. Contact with
a liquid refrigerant can result in skin burns or injury to other organs.Exercise due cau-
tion and attention when carrying out jobs on the unit and avoid contact with the refri-
gerant.
•
Wear suitable protective clothing during work.