External Switching Of Heating Program/External Heat Demand External Blocking - Viessmann Vitodens 200-W 19 WB2B Series Installation Instructions Manual

Control Connections
Electrical Connections
External switching of heating program/External heat demand / External blocking
1 2 3 1 2 3 1 2 3
143 144 145
143
144 145
1 2 3
1 2 3 1 2 3
Fig. 43
External 0-10 volt signal connection
1 2 3 1 2 3 1 2 3
143 145
144
144
143 145
1 2 3 1 2 3 1 2
3
+
- -
Fig. 44
212ºF/100ºC
203ºF/95ºC
194ºF/90ºC
185ºF/85ºC
176ºF/80ºC
167ºF/75ºC
158ºF/70ºC
149ºF/65ºC
144ºF/60ºC
131ºF/55ºC
122ºF/50ºC
113ºF/45ºC
104ºF/40ºC
95ºF/35ºC
86ºF/30ºC
77ºF/25ºC
68ºF/20ºC
59ºF/15ºC
50ºF/10ºC
41ºF/5ºC
0V
1V 2V 3V
Fig. 45
48
(continued)
Power/Pump module
EXTERNAL
DEMAND
Power/Pump module
+
EXTERNAL
SIGNAL
- -
0-10 V
8V
4V 5V 6V 7V 9V 10V
aVD - External blocking terminals 2-3
External demand terminals 1-2
External heating program
changeover terminals 1-2
The allocation of the function
"external heating program
changeover" is set via coding
address '91'
See Start-up/Service
Instructions with regard to
changing the coding addresses.
1. Connect the external 0-10 V signal to
plug aVF located in the Power/Pump
module (shown in Fig. 45).
2. Ensure correct polarity.
3. See Fig. 46 for maximum possible
boiler water temperature and
required signal.
* 7.4 VDC at 165ºF / 74ºC for
boiler models WB2B 19, 26, 35