20 | © Danfoss | 2021.06
LGB40450
Termix VVX-I-R FI - 7 Series DS fully insulated
Underfloor heating
Pump stop function
If the heat interface unit is used in connection with underfloor heating,
the circulation pump must be connected to the pump stop function in the
underfloor heating controller. The pump must be stopped if all underfloor
heating circuits are closed.
Warranty
If this is not possible, then flow must be continued through the by-pass.
Failing this, the pump will be at risk of seizure and any remaining warranty
is forfeited.
1. Pump speed
Set the pump to its highest speed before start-up.
2. Start pump
Start the pump and heat through the system.
Remark:
The circulator pump should run for 10 minutes during the first installation.
3. Open isolation valves - primary
The isolation valves should then be opened and the unit observed as it
enters service. Visual checking should confirm temperatures, pressures,
acceptable thermal expansion and absence of leakage. If the heat
exchanger operates in accordance with design, it can be put into regular
use.
4. Vent system
Switch off the pump and vent the installation after the radiators have
warmed up.
5. Check the strainer
Check strainer on heating and DHW underfloor heating.
Strainers should be cleaned regularly by authorized personnel.
The frequency of cleaning will depend on operating conditions.
Start-up
Pump
The pump must be switched off during system filling.
09
see diagram