Draining The Heating System - Wolf CGB-2 Series Installation Instructions For Contractors

27. Draining the heating system
Draining the heating system:
• Switch OFF the condensing boiler at the red ON/OFF switch in the WOLF logo.
• Close the gas ball valve.
• Allow the temperature in the heating circuit to cool to at least 40 °C.
(Risk of scalding)
• Safeguard the heating system against accidental reconnection to the power supply.
• Open the drain valve (boiler drain & fill valve, on site).
• Open the air vent valves on the radiators.
• Drain the heating water.
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