Troubleshooting He - Danfoss EvoFlat WSS Guide D'installation

Mounting and installation instructions

7.3 Troubleshooting HE

Problem
Too little or no heat.
HS supply temperature too high.
Noise in system.
AQ15928645880503-020501
EvoFlat
Possible cause
Strainer in supply line clogged
The filter in the energy meter clogged.
Defective differential pressure controller. Replace main controller, TPC
Defective temperature sensors.
Automatic controls, if any, wrongly set or
defective - possibly power failure.
Pump out of operation.
The pump is set at too low speed of
rotation.
Air pockets in the system.
Defective radiator valves.
Defective TPC-M controller, alternative-
ly differential pressure controller. The
controller does not react as it should
according to the instructions.
Pump pressure too high. Noice from
radiator valves.
Mass flow below the control range
Solution
Clean strainer(s)
Clean the filter
Replace thermostat
Check if the setting of the controller
is correct – set coorectly or replace
Check if the pump is receiving power
and that it turns. Check if there is air
trapped in the pump housing.
See pump manual
Set the pump at higher speed of rotation.
See pump manual.
Vent the system throughly - see the
instruction
Check – replace
Replace TPC-M controller
Adjust pump to a lower level. Check flow
direction.
Reduce the spread and thereby increase
the mass flow
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