If the supply temperature “SupplyTemp” exceeds the limits, defined by parameters BST-03 and BST-01, the boiler stages “ModStage” and “Stage1Cmd” will be respectively switched off. If the boiler supply temperature “SupplyTemp” exceeds the limit of BST-01, the boiler valve will stay open and the boiler pump on, in order to get the temperature down again.
If the highest temperature of either supply “SupplyTemp” or return “RetTemp” exceeds the limits, defined by parameters BST-03 and BST-01, the boiler stages “ModStage” and “Stage1Cmd” will be respectively switched off. In order to get the high temperature down again, the boiler valve will stay open and the boiler pump on.
Table 14. Parameter List
Description |
Value Range |
Default Value |
Unit |
BST-01: maximum boiler supply temperature stage 1 |
50...500 |
90 |
°C |
BST-03: maximum boiler supply temp. modulating stage |
50...500 |
85 |
°C |