Servicing
30
NOTICE: The manufacturer recommends installing water filter to the heating system.
Fig. no. 11
NAOS K4G1S24XX – Boiler connections, bottom view of the boiler
Fig. no. 12 NAOS K4G1S24XX –Connections of the boiler with a flow type heater, bottom view of the
boiler
Fig. no. 13 NAOS K4G1S24XX – Connections of the boiler with a reservoir type heater, bottom view
of the boiler
The expansion tank capacity is 10 liters. This volume is enough for approx. 150 l of water in the heating
system.
The system should be designed for a temperature gradient of 50/30 °C due to the use of condensation. The
condensing boiler can also be used for old gravitational systems that usually were overdesigned and thanks
to this fact condensation can be efficiently used even for this system but it is necessary to expand this
system with a corresponding expansion tank.
The condensing boiler is equipped with a Willo three-speed pump. Setting of the pump speed shall
correspond with the requirements of the heating system so that the hydraulic system is balanced.
Connecting to the HSW heating system and to the gas pipe is implemented through ball valves.
1
… heating water outlet
2
… condensate outlet
3
… hot water outlet
4
… safety valve outlet
5
… filling valve
6
… gas inlet
7
… hot water heating inlet
8
… heating water inlet
1
… heating water outlet
2
…condensate outlet
3
…safety valve outlet
4
…gas inlet
5
…filling valve
7
…system water filling inlet
8
… heating water inlet
1
… heating water outlet
2
… water inlet to the heater
3
… condensate outlet
4
… safety valve outlet
5
… gas inlet
6
… filling valve
7
… hot water heating inlet
8
… water inlet from the heater
9
… heating water inlet
