Lochinvar Power-fin 1701 - Manual (Page 10)

1
Service
10
Service Manual
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 heating set point. As long as both the space heating
and DHW calls for heat remain active, the control will switch
back and forth between the two modes until one of them is
satisfied.
HTR: SH 41% RATE
OUT: 123.0F(129)
10. Once both calls for heat are satisfied, the control will turn
off the burner. The blower will remain on for the
30 second postpurge cycle. Any pumps that are running
will continue to run for their respective pump delay times,
then turn off.
HTR: POSTPURGE
OUT: 127.4F(129)
11. Boiler pump off, system pump continues its delay if
longer.
HTR: Standby
OUT: 124.7F(129)
12. System pump off.
HTR: Standby
OUT: 122.9F(129)