Appendix 1 - Single Boiler With 0-10V Heat Demand Input - Buderus Logamax plus GB162 Applications Manual

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Appendix 1 - Single boiler with 0-10V
heat demand input
A single boiler can be controlled via a quantified 0-10V heat
demand signal from a building management system. The EM10
module will read the 0-10V signal and modulate the boiler
according to:
(1) the system supply temperature
(2) power output
Control based on supply temperature
The EM10 uses the 0-10V signal of the building management
system to compute the system supply temperature set point.
This is a linear ratio (table 5).
Input Flow temperature
voltage set point
(V) (boiler)
(°F)
0
32
0.5
32
0.6
± 59
5.0
± 122
10.0 ± 194
Table 5
Control based on boiler output
The EM10 uses the 0-10V signal of the building management
system to compute a performance set point. This is a linear ratio
(table 6).
Input Performance set
voltage point (boiler)
(V) [%]
0
0
0.5
0
0.6
6
5.0
50
10.0 100
Table 6
*) The low-load performance depends on the device type. E.g. if the low
load of the device is 20% and the control signal is 1 Volt (= 10%), the
performance value setting is lower than the low load. In this case the
boilers may be cycling on and off.
Technical specifi cations are subject to change without prior notice
Status of
boiler
(°C)
OFF
0
OFF
0
ON/heat demand
± 15
ON/heat demand
± 50
ON/heat demand
± 90
Status of
boiler
OFF
OFF
Low load *)
Part-load
Full load
GB162 Applications Manual
194 (90)
167 (75)
140 (60)
113 (45)
86 (30)
60 (15)
32 (0)
Voltage
Figure 42 0 -10V Diagram
100%
50%
30%
0%
0 2
Voltage
Figure 43 Control based on power output
Logamax plus GB162 applications manual | 03.2013
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