Danfoss VVX-I Operating Manual page 8

Operating Guide Termix VVX-I with complete insulation
Under floor heating:
Pump stop function
If the substation is used in connection with under floor heating, the
circulation pump must be connected to the pump stop function in
the under floor heating controller. The pump must be stopped if
all under floor 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remaining warranty will be withdrawn.
Summer operation:
Switch off pump
In summer the circulation pump must be switched off and the
shut-off valve to HE supply closed.
Running pump bi-weekly
It is recommended to start up the circulation pump (for 2 minutes)
once a month during summer; the shut-off valve of the HE supply
must be shut.
Electronic controller
Most electronic controllers will start up the pump automatically
(please note manufacturer´s instructions).
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