Danfoss EvoFlat 4.0 M, Installation Manual

Page: 15 / 48

Installation Guide EvoFlat 4.0 Flat Stations for apartments, single- and multi-family houses
© Danfoss | DCS-SGDPT | 2022.01 AN40274706699301-010101 | 15
EN
8.3 Troubleshooting HE
Problem Possible cause Solution
Too little or no heat. Strainer in supply line clogged. Clean strainer(s)
The filter in the energy meter clogged. Clean the filter
Defective differential pressure controller. Replace main controller, TPC
Defective temperature sensors. Replace thermostat
Automatic controls, if any, wrongly set or defective
— possibly power failure.
Check if the setting of the controller is correct —
set coorectly or replace
Pump out of operation. Check if the pump is receiving power and that it
turns. Check if there is air trapped in the pump
housing. See pump manual
The pump is set at too low speed of rotation. Set the pump at higher speed of rotation.
See pump manual.
Air pockets in the system. Vent the system throughly — see the instruction
Defective radiator valves. Check — replace
HS supply temperature
too high.
Defective TPC-M controller, alternatively differential
pressure controller. The controller does not react as
it should according to the instructions.
Replace TPC-M controller
Noise in system. Pump pressure too high.
Noice from radiator valves.
Adjust pump to a lower level.
Check flow direction.
Mass flow below the control range Reduce the spread and thereby increase the mass
flow
Too high HS return
temperature.
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.
Defective sensor on self-acting thermostat.
Make sure the heat is distributed evenly across
the full heating surface — open all radiators and
keep the radiators in the system from heating up
at the bottom. It is extremely important to keep
the supply temperature to the radiators as low
as possible, while maintaining a reasonable level
of comfort.
The system is single pipe loop. The system should be equipped with electronic
controls and return sensors.
Pump pressure too high. Set the pump at a lower speed of rotation.
See pump manual.
Air in system. Vent the system throughly — see the instruction
Defective or incorrectly set radiator valve(s).
Single pipe loop systems require special one-pipe
radiator valves.
Check — set/replace.
Dirt in the differential pressure controller. Check — clean out.
Defective motorized valve, sensor or automatic
controller.
Check — replace.
8.4 Disposal
Disposal
This product should be dismantled and its compo-
nents sorted, if possible, in various groups before
recycling or disposal.
Always follow the local disposal regulations.