In heating systems boilers are used in the primary heating system to cover the required heating load in buildings. Boilers can have large or small water contents and can be equipped with or without 2- or 3-way boiler valves. Boilers with a large water content can start without circulation, but boilers with a small water content cannot start without circulation. In this module 6 boiler type configurations are selectable by the parameters SYS-02 and SYS-03 as shown in the next table.
Table 2. Boiler configuration
Configuration |
Boiler valve |
Control function |
1 |
3-way |
minimum return temperature control |
2 |
2-way |
maximum return temperature control |
3 |
2-way |
no return temperature control |
Table 3. Boiler water volume
Configuration |
Water volume |
1 |
large |
2 |
small |
The boiler type configurations are shown in the next figures.
SYS-02 = 1 |
SYS-02 = 2 |
SYS-02 = 3 |
minimum return temperature control |
maximum return temperature control |
no return temperature control |
Fig. 1. Boiler configurations
NOTE: For the boiler butterfly valve applications connect the output “ButFlyVlv” to obtain the required on/ off operation.