16 | © Danfoss | 2023.04
LGB53541
Termix VMTD-IV MIX - 5 Series DS Fully insulated
Fitting piece
The HIU is equipped with a fitting piece for the energy meter.
Mounting the energy meters:
• Close isolation valves
Close the isolation valves on Heat network supply and Heat network
return, if there is water in the system.
• Loosen nuts
Loosen the nuts on the fitting piece.
• Remove fitting piece
Remove the fitting piece and replace it with the energy meter. Don´t
forget the gaskets.
• Tighten connections
After mounting of the energy meter, remember to check and tighten all
threaded connections.
Sensor pocket
The sensors of the energy meter is mounted in the sensor pockets.
41
see diagram
14
see diagram
Fitting of energy meter
Filling of the heating system
Re-tighten connections
After water has been added to the system and the system has been
put into operation, re-tighten ALL connections.
A flushing bypass or similar should be mounted.
Only introduce heating network water in the HIU once it has been flushed.
Commissioning
Before start-up check that:
• Pipes are connected in accordance with the symbols indicated on the
HIU.
• Then slowly open the isolation valve(s) so that the HIU fills with water.
• Ensure that all union fittings and swivel nuts have been re-tightened.
• The heating circuit must be vented before commissioning.
• Monitor the HIU’s operation in regard to temperature, pressure, thermal
expansion and leaks.
• Provided the HIU functions in accordance with the dimensioning
regulations, it can be put into use.
