K4
Changes in models reserved.
Dimensions not binding!
General Information
16
4.3
Main Boiler Parts
Fig.
№
. 4
The VIADRUS K4 boiler assembly (version shown - K4G2HXXXX)
1
three-way valve (only for versions K4G2HXXXX and K4G3HXXXX)
2
HSW temperature sensor (only for version K4G2HXXXX)
3
HSW exchanger (only for version K4G2HXXXX)
4
gas valve
5 siphon
6
safety valve
7
circulation pump
8
gas supply pipe
9
bleeder valve
10 boiler electronics
11 burner plate
12 heating water temperature sensor
13 mixer
14 safety thermostat
15 combination electrode
16 boiler frame
17 exchanger
18 fan
19 expansion tank
20 pressure gauge
21 boiler front cover
General Information
16
4.3
Main Boiler Parts
Fig.
№
. 4
The VIADRUS K4 boiler assembly (version shown - K4G2HXXXX)
1
three-way valve (only for versions K4G2HXXXX and K4G3HXXXX)
2
HSW temperature sensor (only for version K4G2HXXXX)
3
HSW exchanger (only for version K4G2HXXXX)
4
gas valve
5 siphon
6
safety valve
7
circulation pump
8
gas supply pipe
9
bleeder valve
10 boiler electronics
11 burner plate
12 heating water temperature sensor
13 mixer
14 safety thermostat
15 combination electrode
16 boiler frame
17 exchanger
18 fan
19 expansion tank
20 pressure gauge
21 boiler front cover
Legend
1. Three way valve (only for models
K4G2H..
and
K4G3H..
)
2. HWS temperature sensor
(only for models
K4G2H..
)
3. HWS plate heat exchanger
(only for models
K4G2H..
)
4. Gas valve
5. Condensation trap
6. Safety valve
7. Circulation pump
8. Gas supply pipe
9. Bleeder valve
10. Boiler control unit
11. Burner plate
12. Heating water temperature sensor
13. Venturi
14. Safety thermostat
15. Electrode
16. Boiler frame
17. Stainless Steel heat exchanger
18. Fan
19. Expansion vessel
20. Pressure gauge
21. Boiler cover
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 K4G
1
HXXXX
version designed for heating only is equipped with a circulation pump
VIADRUS K4G
2
HXXXX
version with a circulation pump and flow type hot water (hereafter referred to as “DHW”) heater
VIADRUS K4G
3
HXXXX
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:
-
to the chimney,
-
through the wall,
-
through the roof (either inclined or horizontal),
-
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
4.4 Removing The Front Cover
4.5 Main Boiler Parts
20
Boiler Design
