Instructions
DEN-GT
VI.CW.C1.02 / LUK40110
© Danfoss 04/2011
11
Termix VMTD-F-B - substation for direct HE and DHW
Problem
Possible cause
Solution
Poor cooling.
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 ever possible, while maintaining
a reasonable level of comfort.
The system is single pipe loop.
The system should feature electronic
controls as well as return sensors.
Pump pressure too high.
Adjust pump to a lower level.
Air in system.
Vent the system.
Defective or incorrectly set radiator
valve(s). Single pipe loop systems
require special one-pipe radiator valves.
Check – set/replace.
Dirt in the motorized valve or in the
differential pressure controller.
Check – clean out.
Defective motorized valve, sensor or
automatic controller.
Check – replace.
Electronic controller not adjusted
correctly.
Adjust according to instructions.
Noise in system.
Pump pressure too high.
Adjust pump to a lower level.
Heat load too high.
Defective motorized valve, sensor or
electronic controller
Check – replace.
