FläktGroup Multi-DENCO, Руководство по эксплуатации

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Multi -DENCO Fault Finding and Troubleshooting
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 105
High pressure in refrigeration sy-
stem Too much refrigerant within
system
Refer to commissioning report and compare current conditi-
ons with conditions during commissioning. If significant
changes then perform re-commission the unit.
Outdoor fans may not
be operating See ‘Fault’ below
Fuse or relay fault Review the unit to check for damage to any fuse or relay that
is part of the refrigeration circuit operation
Outdoor heat exchanger is
blocked/dirty Clean heat exchanger fins and clear debris in and around
unit
Indoor fans not operating Blocked filter alarm Check the coil filters for cleanliness, clean or replace as
appropriate
Fan motor failure The fan and the motor are a dynamic pair, therefore the fan
assembly must be replaced
Fan relay not activating Check the fan relays (1 relay per fan)
Unit off by… Check the controller display to see if the unit has been
disabled by; BMS, Time or Keyboard. If the unit is also part
of a network, it could be on a ‘Stand-by’ status.
Outdoor fans not operating Outdoor unit isolated Check the isolator on the unit is set to the ON position
Condensing pressures below
the minimum requirements If the refrigerant circuit pressure is below the condenser’s
set-point the fans will not activate – observe the pressure in-
creasing in the unit controller and check fans start when
pressure increases sufficiently
Outdoor unit not receiving con-
trol signal from indoor unit Compare terminals at outdoor and indoor units to check ca-
ble integrity
No image on the display No power to the unit Check the power supply at the mains power distribution
board and at the local isolator.
Display unit cable disconnected Deactivate the unit and open the door with the display. In-
spect the connection and cable at the display and the con-
troller.
Unit not cooling/heating/
humidifying/dehumidifying Airflow failure alarm Check fan operation and suitable clearances in and around
the fan. Check output of the controller to the fan and each
fan relay is energised.
Heater over-temperature alarm
(heating only) Check the heater thermostat for functionality, replace if
necessary and check function of heaters.
Water detection alarm Standard configuration disables the humidifier only. Settings
available in the controller allow for whole unit operation to be
stopped. Inspect underneath the unit for presence of water
and check coil condensate tray.
Sensor failure Certain temperature and pressure sensors, upon failure, will
disable functions of the unit. Refer to the controls manual to
see what function is affected by each sensor.
Low oil level (functions disabled
by compressor alarms) Check for possible leaks and the recent operations of the
unit (to ensure suitable functionality). Add oil as necessary
and re-commission the unit.
Fault Possible Reason Possible Remedy
Tab. 11-1