Troubleshooting - Danfoss VX Solo II Instructions Manual

Instructions

14.0 Troubleshooting

If operating disturbances occur, the following basic features
should be checked before carrying out actual troubleshooting:
- the substation is connected to electricity,
- the strainer on the district heating supply is clean,
14.1 Troubleshooting - Heating
Problem
No heat
Uneven heat distribution
Supply temperature too high
Danfoss District Energy
VX Solo II
- the district heating flow temperature is at normal level
(summer at least 60 °C, winter at least 70 °C),
- the differential pressure is higher than or equal to the normal
(local) differential pressure in the district heating network. -
If in doubt, ask the district heating plant,
- there is pressure on the system.
Possible cause
Strainer clogged on DH og HE side
(radiator circuit).
Filter in district heating meter clogged.
Defective differential pressure controller.
Defective sensor
Defektive actuator.
Defective motor valve - or possibly dirt
in the valve housing.
Automatic controls wrongly set or defec-
tive - possibly power failure.
Pump out of operation.
The pump is set at too low speed of
rotation.
Air pockets in the system.
Air pockets in the system.
Wrong setting of automatic controls.
Defective sensor.
Defective controller. The controller does
not react as it is should in accordance
with the instructions.
VI.GP.P1.02
Solution
Clean strainer.
Clean the filter (after consulting the
district heating plant).
Check the functions of the differential
pressure controller - clean valve seat if
required.
Replace sensor
Check the functioning of the actuator.
Check the functions of the motor valve -
clean valve housing if required.
Check if the setting of the controller is
correct - see separate instructions. Check
the power supply.
Temporary setting of actuator to "man-
ual" control - see instruction on heating
circuit, manual control.
Check that the pump is receiving power
and that it runs. Control that there is
no air in the pump housing - see pump
manual.
Set the pump at higher speed of rotation
- see instructions on heating circuit.
Vent the installation thoroughly.
Vent the installation thoroughly.
Adjust automatic controls, see instruc-
tions for automatic controls.
Replace sensor.
Call in automatic controls manufacturer
or replace controller.
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DKDHR