1
Service
11
1
Service
(continued)
OPERATION
DISPLAY
1. Upon a call for heat, the gas pressure switch(es) must be closed.
2. Once the gas pressure switch(es) are closed, the control turns
on the appropriate pumps (system and boiler pumps for space
heating, DHW pump for DHW). The flow switch and/or LWCO
must close.
3. The air pressure switch and blocked drain switch must close.
4. The control starts the prepurge cycle by initiating the blower.
5. The control starts the trial for ignition by firing the spark electrode
and opening the gas valve.
6. If flame is not detected after the sparking ends, the control will
perform a postpurge, then start another prepurge cycle and try to
light the burner again. The control will perform a total of 4
attempts before locking out.
7. If flame is detected, it holds the firing rate steady for a few
seconds to let the flame stabilize, then it begins to modulate the
firing rate based on a set point or some other command (such
as a 0-10V BMS signal).
Table 1-1 Sequence of Operation
Outdoor Knight Boiler Service Manual
