4.2.1 EXPANSION TANKWallcon X-treme boilers do not have an expansiontank. So the capacity of the expansion tank shouldbe selected according to the capacity of the heatingsystem and the static pressure.It is recommended to place the expansion tankon the turn of the central heating system.4.2.2 SAFETY VALVEWalcon X-treme boilers are equipped with a safetyvalve. The hose of this safety valve must beconnected to a drain. Manufacturer cannot be heldliable for damages caused by water flow into theboiler or on the ground when excessive pressure isgenerated in the heating installation.Safety valve must not be used as a means ofdraining water from the system.Draining water of the safety valve can be veryhot. Beware of scalding.4.2.3 CONDENSATION WATER DRAINCondansation water which is generated during tothe combustion, transfers to the water drainconnection by the syphon and drain hose.Condensation water is acidic and corrosive (approx.2 ph). So all of the connections which are made forcondensation water must be made with PP typepipes. Condensation water must be transferred tothe drain with the shortest way possible. For healthand environmental reasons it mustn’t transfer suchplaces near people, animals and plants. Condensation water must not be connected torain drain systems. The condensate drain line must have a slope ofat least 3%. A neutralization tank should be used forcondensate water occurring in systems with atotal power of 200 kW and above. It is mandatory to comply with the relevant localregulations for the discharge of condensatewater.16WALLCON X-treme 115-125-150