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Viessmann | Vitodens 100-W WB1C | User manual | WB1C System Boiler Wiring
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Viessmann Vitodens 100-W WB1C is a versatile gas condensing boiler suitable for various heating systems, including traditional 'Y' or 'S'-plan (2-pipe), weather-compensated 4-pipe, and open-vented 4-pipe systems. It features an 8-liter expansion vessel, a pressure safety valve, a built-in diverter valve, and the option to connect an external room thermostat for precise temperature control. The boiler's dual temperature control allows for independent operation of central heating and domestic hot water circuits, ensuring optimal comfort and energy efficiency.
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Note on installation
for heating engineers
System boiler wiring instructions
for Vitodens 100-W, Typ WB1B & Typ WB1C
The Vitodens 100-W system boiler offers several installation alterna- tives.
From traditional 'Y' or 'S' plan
(2-pipe system) to weather compen- sated 4-pipe system connected to an un-vented DHW cylinder using the integral expansion vessel and diverter valve.
The advantages of connecting the system boiler to a 4-pipe system are as follows:
• The DHW circuit operates indepen- dently of the CH circuit
• Dual temperature control, which means the CH circuit can be operated on weather compensated system (reduced flow temperature)
• Using the boilers temperature cut-out device and integral diverter valve to protect the cylinder from overheating.
5414 394 8/2009/14
Option 1: 4-pipe system using an un-vented cylinder
®
©
@
M
Radiators
® Boiler
© DHW-cylinder
@ Motorised valve (Energy cut-out)
Viessmann 4-pipe system
Note: It is recommended that the coil output of the cylinder is greater than 10 kW to prevent long hot water re-heat periods.
DHW has priority.
The boiler is factory fitted with an 8 l expansion vessel, pressure safety valve (3 bar) and diverter valve.
If an existing or third party un-vented cylinder is used in conjunction with the Vitodens 100-W system boiler a
2-port (Energy cut-out) valve may be fitted in the DHW circuit. In this case the 2-port valve, cylinder thermostat and timer has to be electrically wired through the provided control box
(see wiring example).
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Electrical wiring example fo r Option 1
With existing CH/DHW programmer
5
@
@
®
®
©
@
®
Terminals in the control unit
® Cylinder demand terminal box
© Cylinder thermostat
@ Safety temperature sensor
® Valve
® Room thermostat (clock thermo- stat)
@ Terminal box (on site)
@ Power supply 230 V, 50 Hz
3
Electrical wiring example fo r Option 1 (cont.)
With Viessmann Vitotrol 100, RF/RF2 or standard room thermostat
5
@
®
©
@
@
®
®
Terminals in the control unit
® Cylinder demand terminal box
© Cylinder thermostat
@ Safety temperature sensor
® Valve
Other Viessmann secondary controls
(existing programmer to be omitted) - see separate matrix.
• Weather compensation + 2-channel digital timer
® Room thermostat (clock thermo- stat)
@ Terminal box (on site)
@ Power supply 230 V, 50 Hz
• Vitotrol 100, RF1 - analog; DHW time function limited (either as CH or constant)
• Vitotrol 100, RF2 - digital; 2-chan- nel with CH and DHW time control options.
4
Option 2: 4-pipe system with open vented cylinder
Viessmann 4-pipe system with open vented hot water or with Vitocell unvented cylinder
®
©
Radiators
® Boiler
Note: It is recommended that the cylinder coil output is greater than 10 kW to prevent long hot water re-heat periods.
DHW has priority.
The primary circuit is sealed system.
The boiler is factory fitted with an 8 l expansion vessel, pressure safety valve (3 bar) and diverter valve.
© Open vent DHW-cylinder or
Vitocell
5
Electrical wiring example fo r option 2
X21
7
X20
X
©
4 3 2 1
�
@ X1
CN2
GAS PUMP FAN
@ L N 1 L N
® ®
OT
®
� Tank sensor connection
(sensor is optional - part no. 7178 348)
Outside temperature sensor
(accessory)
® Open Therm device
© Connection Line (accessory)
@ Jumper (remove when connecting a room thermostat)
® Power supply
(230 V, 50 Hz)
® Vitotrol 100
(room temperature ontroller)
Other Viessmann secondary controls
(existing programmer to be omitted) - see separate matrix
• Weather compensation + 2-channel digital timer
• Vitotrol 100, RF1 - analog;
DHW time function limited (either as CH or constant)
• Vitotrol 100, RF2 - digital;
2-channel with CH and DHW time control options.
6
Option 3: Traditional 'Y' or 'S'-plan system (2-pipe)
Schematic Sealed Primary System
®
® ®
@ @
@
M
®
M
©
Radiators
® Boiler
© DHW-cylinder
@ Motorised valve
Note: Schematic shows safety valve, expansion vessel, pressure gauge and pump being external of the boiler. The Vitodens 100-W system boiler has all these components already factory fitted.
® Pump
® Gauge
@ Expansion vessel
@ Savety valve
7
Electrical wiring example - S-plan system with Vitodens 100-W
M
1-
®
M
1-
®
© @
L N @
S1
®
Power supply 230 V, 50 Hz
® Time controller
© Roomthermostat (clock thermo- stat)
@ Cylinder thermostat
@
M
1-
@
L
N
1
L
N
N
L
@
�
X1
CN2
® Zone valve
® Pump
X9 Terminals in the control unit
� Pump connection
Viessmann Werke GmbH&Co KG
D-35107 Allendorf
Telefon: 06452 70-0
Telefax: 06452 70-2780 www.viessmann.de
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