FläktGroup Multi-DENCO, Operation Manual, Page: 91 / 120

Multi -DENCO Commissioning
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 91
Procedure
1. Calculate the 'system refrigerant'.
– This is the refrigerant required to charge a standard system without a winter kit
option (indoor/outdoor unit and interconnecting pipework).
2. Calculate the refrigerant required to fill the liquid receiver to 80% (see Tab. 8-4).
At average condensing temperatures of 41 °C with 6 K sub-cooling; 35 °C liquid temperatures. Density = 1 kg/L
3
.
3. Before adding refrigerant, set the condenser fans to minimum speed and lowest
pressure setting.
– This is to allow the liquid receiver to be assessed whilst the fans are operating.
4. Add the initial refrigerant.
•
ONLY add 75% of the 'system refrigerant' (excluding the liquid receiver
refrigerant) should be added initially (see 'Initial charge for refrigerant circuits'
chapter 8.2.6).
•
Enable the unit and set the compressors to operating at high speed (chapter
8.3.5)
•
Add refrigerant in amounts no larger than 0.5kg into the suction line: using the
metering valve on appropriate service gauges.
•
After each addition, allow the system to stabilise and check conditions before
adding any more.
•
Monitor the sight glass throughout the process - when flashes of liquid are ob-
served – stop adding refrigerant
NOTICE
Overfilling of liquid receivers can result in poor system performance or failure.
•
The liquid receiver should never exceed 80% full.
Condenser
Size Liquid Receiver – 100% Capacity
Litres
100% Filled – R410A
kg
80% Filled – R410A
kg
DMOUCD008
7 7 5.6
DMOUCD013
7 7 5.6
DMOUCD021
12 12 9.6
DMOUCD026
15 15 12.0
DMOUCD032
18 18 14.4
DMOUCD050
21 21 16.8
DMOUCD075
21 21 16.8
Tab. 8-4
NOTICE
To change the required settings for C5-12 controls, you must use the display of the
unit, which requires the unit to be enabled. To perform safely you must observe the
following:
•
Enable power to the unit and set the local isolator to the 'ON' position
•
Wait for the unit to finish its start-up procedure
•
DO NOT press the 'Enable' button on the home screen (bottom left hand corner)
•
Navigate to the condenser settings (Advanced Level)
•
Modify settings as advised
•
Navigate to the home screen
•
Set the local isolator to the 'OFF' position and remove power from the main
power distribution board
9
The unit is now ready for charging