Troubleshooting; Troubleshooting: Dhw - Danfoss EvoFlat WSS Guide D'installation

Mounting and installation instructions

7.0. TROUBLESHOOTING

7.1 Troubleshooting in general
6.1 Troubleshooting in general
In the event of operating disturbances, the following basic features
should be checked before carrying out actual troubleshooting:
• the flat station is connected to electricity,
• the strainer on the HS supply pipe is clean,
• the supply temperature of the HS is at the normal level,
• the differential pressure is equal to or higher than the normal
(local) differential pressure in the HS network – if in doubt, ask
the HS plant supervisor.

7.2 Troubleshooting: DHW

Problem
Too little or no domestic hot water
DHW is available only at some draw-off
points.
DHW temperature too high
Temperature drop during tapping.
22 | © Danfoss | Produced by Danfoss Redan A/S | 2020.12
EvoFlat
Possible cause
Supply flow insufficient
Low temperature / variations in tempera-
ture at the draw-off points
Strainer in the cold water supply line
clogged.
Circulation pump out of operation , set at
too low speed of rotation (if DHW circula-
tion is established)
Non-return valve defective or clogged (if
DHW circulation is established)
Defective DHW thermostat
Defective TPC-M controller
Calified heat exchanger
Lack of cold water pressure
Defective thermostatic mixing valve
DHW controller
DHW controller defective
Larger DHW flow than the flat station has
been designed for.
Authorized personnel only
Assembly, start-up and maintenance work must be per-
formed by qualified and authorized personnel only.
Solution
Collect data from the heat meter
Check the network pump - constant pressure
If necessary, close the bypass in the tap block
Check the function of the ball valves and
open if necessary
Vent the system throughly - see the instruc-
tion
Change the summer bypass setting if neces-
sary
Collect data from the heat meter
Change the positioning time of the mixer
actuator
Change the heating curve if necessary
Position the switch-on sensor correctly on the
buffer line
Change cleaning periods for biomass boilers
Clean strainer
Check the function of the circulation pump
and replace if required
Check the functioning of the non-return valve
and replace if required
Check the functioning of the DHW thermo-
stat and repace if necessary
Check the functions of the controller,
and replace if required
Replace heat exchanger
Increase pressure
Replace thermostatic mixing valve
Adjust controller
Check the functions of the controller,
and replace if required
Reduce DHW flow
AQ15928645880503-020501