FläktGroup Multi-DENCO - Post-Commissioning Procedure

Multi-DENCO Commissioning
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 113
8.3.13 Common commissioning issues
• If the discharge pressure is unstable, adjust the set-points and proportional bands
of the condenser until the discharge pressure stabilises. The condenser(s) should
be left on 'Minimum cut-off' wherever possible.
• If the electronic expansion valve(s) (EEV) do not open during start-up, and no alarm
or status message is shown, check the EEV transducers and the temperature probe
for functionality.
• (Size 010 to 065 units) if during charging there is an 'Overcurrent' alarm from the
inverter drive, potentially too much liquid is entering the compressor. Throttle back
the manifold gauge to reduce liquid entering the system.
8.4 Post-commissioning procedure
8.4.1 Nameplate
Once the commission has been successfully completed, it is a LEGAL REQUIRE-
MENT that the total refrigerant charge for the whole system is written onto the unit's
nameplate.
You will see space for this to be written on the bottom left corner of the serial plate.
8.4.2 Saving controller settings
After commissioning, we recommend that your service technician saves the unit con-
figurations to the controller. This can allow for the system settings to be restored, back
to the configuration made during commissioning. More details of this feature are avail-
able in the controller manual.
8.4.3 Commissioning report
As mentioned previously, it is very important that you submit a copy of the
'Multi-DENCO Commissioning Report' (chapter 13.3) to your local sales/service repre-
sentative, so that this can be retained against the project. Failure to do so may invali-
date warranty.
8.4.4 Configuration of accessories
Depending upon what design options have been selected, you may be required to con-
tinue with configuration of specific accessories (for example, humidifier or condensate
pump).
Refer to initial design selection or the serial plate within the unit to establish if all nec-
essary parts have been commissioned and configured.
NOTE!
For filter switches, we recommend the following settings:
– G4 = 0.7 mbar (70 Pa)
– F7 = 1.2 mbar (120 Pa)
These values are based on standard pressure drops when fans operating at max
velocity. Different values may be required if fans are operating at lower speeds (as
alarm may not occur until fan increases speed to compensate for dirty filters).