Troubleshooting; Troubleshooting - Heating - Danfoss VX Solo HWS Instructions For Installation And Use Manual

Instructions for installation and use

13.0 Troubleshooting

If operating disturbances occur, the following basic features
should be checked before carrying out acual troubleshooting:
- the substation is correctly connected,
- the district heating supply temperature is at least 70 °C,
- the differential pressure is higher than or equal to the normal
(local) differential pessure in the district heating network. - If
in doubt, ask the district heating plant,

14.1 Troubleshooting - Heating

Problem
No heat
Uneven heat distribution
Supply temperature too high
Danfoss District Energy
VX Solo HWS substations
- the substation is connected to electricity (pump and
automatic components),
- the dirt strainer in the district heating supply pipe is clean,
- air pockets in 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.HE.M1.02
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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