Installation & Operation Manual
11 Operating information
Sequence of operation (continued)
OPERATION | DISPLAY |
8.If the space heating call for heat is active, and the tank thermostat or sensor starts a DHW call for heat, the boiler will switch to the DHW mode. If programmed for normal DHW operation (not as a zone), the DHW pump will turn on first, then the boiler pump will turn off 2 seconds later. This will divert the boiler’s outlet water from the heating system and send it to the tank coil instead. The control will then modulate to maintain the outlet temperature to the DHW boiler set point.
9.If the boiler is not part of a Cascade, and both the space heating and DHW calls for heat remain active long enough, the boiler will switch back and forth between the two heating modes until one of them is satisfied.
10.Once both calls for heat are satisfied, the control will turn off the burner. The blower will continue to run during a 10 second postpurge.
11.Any pumps that are running will continue to run for their respective pump delay times before turning off, unless programmed to remain on continuously. A 60 second
12.In Standby, ready to start a new cycle.
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