General Information
15
4 Boiler Description
4.1 Boiler Design
The boiler elementary structure consists in a condensing exchanger made of stainless steel pipes. It is checked for tightness by test
overpressure 5 bar. The boiler is further equipped with a premix burner. The combustion mixture is mixed in a mixer in the preset air-gas ratio
within the entire output range. Air is supplied to the mixer by a modulation fan.
The boiler is made in three versions:
VIADRUS K4G1HXXXX version designed for heating only is equipped with a circulation pump
VIADRUS K4G2HXXXX version with a circulation pump and flow type hot water (hereafter referred to as “DHW”) heater
VIADRUS K4G3HXXXX version with a circulation pump and a three-way valve ready to be used in combination with a reservoir type hot
water heater
The Honeywell automatics is an electronic control and ignition automatics designed for gas-fired central heating boilers with a modulated fan
and burner with preliminary mixing.
The combustion air inlet and the flue gas outlet may be implemented by several means as follows:
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to the chimney,
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through the wall,
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through the roof (either inclined or horizontal),
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to a joint shaft.
The boiler is an appliance in version C, i.e., a closed appliance with electronic ignition and flame ionization.
4.2 Control Features
Fig. . 2 The VIADRUS K4 boiler control panel
4.2.1 Removing the front cover
• Remove the bolts (1)
Pulling the cover side detach
the Velcro strip (2)
• Remove the front cover
Fig. . 3 Removing the boiler front cover
1 electronic panel with the control panel
2 pressure gauge
3 valve for adding water to the heating system
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