1 Service
Sequence of operation
Table 1A_(continued from previous page) Sequence of Operation - Space Heating and DHW
OPERATION | DISPLAY |
9.If the DHW thermostat remains on for more than 30 minutes, and the space heating call for heat is also on, then the control will turn on the boiler pump, turn off the DHW pump
after 2 seconds, and resume firing based on the space HTR: RUN STG 12
heating setpoint. As long as both the space heating and OUT: 123.0F(129) DHW calls for heat remain active, the control will switch
back and forth between the two modes until one of them is satisfied.
10.Once both calls for heat are satisfied, the control will turn
| off | the burners. The blower will remain on for the | HTR: POSTPURGE |
| 30 | second postpurge cycle. Any pumps that are running | |
| will continue to run for their respective pump delay times, | OUT: 127.4F(129) | |
| then turn off. |
| |
|
| ||
11. | Boiler pump off, system pump continues its delay if HTR: Standby | ||
| longer. | OUT: 124.7F(129) | |
|
|
| |
12. | System pump off. | HTR: Standby | |
|
|
| OUT: 122.9F(129) |
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