Boiler System Pipework - Wolf MGK-2-390 Installation Instructions Manual

Ventilation air pipe
DN200 Connection for
room sealed operation
18

11. Boiler system pipework

Heating flow and return are on the right-hand side of the boiler. Always provide shut-off
valves for the flow and the return.
Install a check valve downstream of the boiler circuit pump(s) to prevent incorrect
circulation.
For new systems we recommend installing a blow-down tank (or alternatively a dirt filter)
into the return. For older systems this installation is compulsory.
Install a safety assembly comprising a safety valve with a response pressure
of max. 6 bar, a pressure gauge and an automatic air vent valve.
The line between the boiler and the safety valve must not be able to be
shut off. Severely excessive boiler pressure due to excessive boiler water
temperatures can burst the boiler body or the boiler pipework, which would
lead to a sudden escape of hot water (risk of scalding).
When using pipes and climate-controlled floors that are not impermeable to
oxygen, always provide system separation by means of a heat exchanger.
This boiler is only suitable for heating systems with pumped heating circuits.
Caution
If no heating circuit pump has been installed, sufficient circulation through the
radiators cannot be ensured and the room will not be heated.
Gas connection R2"
Safety assembly 2"
(accessory)
Connection R2" for
safety assembly
Flow connection DN80
/ PN6
Return connection
DN80 / PN6
Test nipple for flue gas
emissions test
Condensate trap with
DN250 flue outlet
Connection R2" for BDF
valve (accessory)
Siphons with
condensate drain
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