Hoval RoofVent KG, Original Operating Manual, Page: 30 / 40

7.7 Hydraulic installation
The complete heating circuit is already integrated in RoofVent ® KG units.
The following work must be carried out during installation:
■ Connect the flow and return pipes of the below-roof unit to the connections in
the roof unit:
– To do this, use the metal tubes supplied loose
(connections: external thread R 1¼" / internal thread Rp 1¼").
– Seal the pipe connection with hemp or thread seal tape.
■ Make sure that the drain tap in the heating section is closed.
■ Check the inlet pressure in the diaphragm expansion vessel.
– Inlet pressure: 120 kPa (at 20 °C)
■ Fill the heating circuit with heat transfer fluid:
– Standard design: ........ Antifrogen N from Clariant, 34% glycol mixture
– ColdClimate design: ... Antifrogen N from Clariant, 44% glycol mixture
– Operating pressure: .... min. 200 kPa (at 20 °C)
Attention
Risk of damage to the unit due to incorrect heat transfer fluids in the
heating circuit. Use only the specified heat transfer fluid.
■ Bleed the heating circuit.
■ Check the heating circuit for leaks.
7.8 Condensate connection
The condensate from the gas condensing boiler is neutralised and flows off
through the condensate drain on the underside of the gas boiler attachment.
■ Install a condensate drain in accordance with the local provisions.
– Plug connection: DN 40
■ To avoid icing:
– Run the condensate line through the roof into the building by the most direct
route possible.
– Insulate the outdoor part of the condensate line.
Condensate drain line with 'condensate drain inside' option
The condensate from the gas condensing boiler is channelled inside the
RoofVent
®
unit to the drain connection in the connection module.
■ Connect the drain hose of the roof unit with the drain hose of the below-roof
unit, fix the connection with a hose clamp and mount the drain connection in the
connection module.
■ Install a condensate drain in accordance with the local provisions.
– Connection: External thread G ¾"
Fig. 28: Connecting the heating circuit
Bild 29: Position of the drain tap behind the access
panel in the heating section
30
RoofVent ® KG
Operating instructions
Transport and installation
4 220 755-en-00