Start-Up; Underfloor Heating - Danfoss Termix VVX-IV 7 Series Operating Manual

Termix VVX-IV - 7 Series DS Fully insulated

Start-up

Start pump
Start the pump and adjust to its highest speed.
Remark:
The circulator pump should run for 10 minutes during the first installation.
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.
Vent system
Switch off the pump and vent the installation after the radiators have
warmed up.
Pump settings
Adjust pump to recommended pump settings.
Check the strainer
Check strainer on primary heating and space heating.
Strainers should be cleaned regularly by authorized personnel. The
frequency of cleaning will depend on operating conditions.

Underfloor heating

Pump stop function
If the HIU 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.
20 | © Danfoss | 2022.02
Pump
The pump must be switched off during system filling.
09
see diagram
LGB55001