Danfoss District Energy
DSA 1 MINI -
15
15
Danfoss District Energy
VM.HE.B2.02
DEN-SMT/PL
Troubleshooting
Problem
Possible cause
Solution
No domestic hot water
Defective or wrongly set differential
pressure controller.
Check the functions of the differential
pressure controller - clean valve seat and
capillary tubes if required - air and rinse
capillary tubes.
Strainer on DH supply clogged.
Clean strainer.
Defective actuator - or possibly dirt in
the valve housing.
Check the functions of the actuator -
clean valve seat if required.
Automatic controls wrongly set or
defective - possibly power failure.
Check if the setting of the controller is
correct - see separate instructions.
Check the power supply;
Temporary setting of actuator to “manual”
control - see instructions on heating
circuit, manual control.
Calified heating element.
Clean DHW cylinder with acid solution or
replace heating element.
Inadequate cylinder capacity.
Wait for heating / loading of the cylinder.
You may check the specifications of the
manufacturer conc. cylinder capacity.
11.2 Troubleshooting - Domestic hot water
Problem
Possible cause
Solution
Supply temperature too low
Wrong setting of automatic controls.
Adjust automatic controls, see instructions
for automatic controls.
Defective controller. The controller does
not react as it is should in accordance
with the instructions.
Call in automatic controls manufacturer
or replace controller.
Outdoor sensor mounted or placed
incorrectly.
Mount/place outdoor sensor correctly.
Poor cooling
Strainer clogged.
Clean strainer.
Too small heating surface / too small
radiators compared to the total heating
requirement of the building.
Increase total heating surface.
Poor utilization of existing
heating surface.
Make sure that the heat is distributed
evenly across the full heating surface -
open all radiators and keep the radiator
in the system from heating up at the
bottom. Higher temperature at the top
and lower temperature at the bottom
part of the radiators means that the
system operation is correct.
The system is single - pipe.
It is extremely important to keep the
supply temperature to the radiators as
low as ever possible, while maintaining
a reasonable level of comfort.
