Service Manual
1Service
Sequence of operation (continued)
Table 1A (continued from previous page) Sequence of operation - space heating and DHW
| OPERATION | DISPLAY |
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8. If the boiler is not part of a cascade, and the DHW call for heat |
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| remains active for more than 30 minutes, and the space heating |
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| call for heat is also active, then the control will turn on the boiler | BLR: SH 41% RATE |
| pump, turn off the DHW pump after 2 seconds, and resume | |
| modulating based on the space heating set point. As long as | OUT: 123.0F(129) |
| both the space heating and DHW calls for heat remain active, | |
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| |
| the control will switch back and forth between the two modes |
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| until one of them is satisfied. |
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| |
9. Once both calls for heat are satisfied, the control will turn off the | BLR: POSTPURGE | |
| burner. The blower will remain on for the 10 second postpurge | |
| cycle. Any pumps that are running will continue to run for their | OUT: 127.4F(129) |
| respective pump delay times, then turn off. | |
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10. | Boiler pump off, system pump continues its delay if longer. | BLR: Standby |
|
| OUT: 124.7F(129) |
11. | System pump off. | BLR: Standby |
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| OUT: 122.9F(129) |
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