Service Manual
1Service
Sequence of operation (continued)
Table 1A (continued from previous page) Sequence of operation - space heating and DHW
| OPERATION | DISPLAY |
|
| |
8. If the DHW thermostat remains on for more than 30 minutes, |
| |
| and the space heating call for heat is also on, then the control | BLR: SH 41% RATE |
| will turn on the boiler pump, turn off the DHW pump after 2 | |
| seconds, and resume modulating based on the space heating | |
| set point. As long as both the space heating and DHW calls for | OUT: 123.0F(129) |
| heat remain active, the control will switch back and forth |
|
| between the two modes until one of them is satisfied. |
|
|
| |
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. | |
|
|
|
10. | Boiler pump off, system pump continues its delay if longer. | BLR: Standby |
|
| OUT: 124.7F(129) |
11. | System pump off. | BLR: Standby |
|
| OUT: 122.9F(129) |
12 
