SETUP & OPERATION
HeatNet Control V3 3.x
Page 18
Mixed Boiler System Operation
Starting Boilers:
When a boiler is to be fired (water temp is below the heating
band), the MASTER checks the HeatNet boilers it has
available. The MASTER boiler then looks at which boilers
are returning Priority 1 firing status (set on a boiler in:
(SETTINGS: FIRING MODE: FIRING PRIORITY:
PRIORITY: 1
)
. If the Start condition for the Priority 1 set is
met (SETTINGS: FIRING MODE: MIXED BOILERS
FIRST
(
example
), the MASTER or MEMBER boiler that is
configured as Priority 1, with the lowest runtime, will be
fired
FIRST
(
example
).
If the start condition for Priority 1 is met, all boilers in the
Priority 1 set will fire based on runtime. Once all boilers in
the Priority 1 set have fired, the Priority 2 set of boilers will
fire based on runtime.
If the Start condition changes and/or is not met (such as
with: OA Temp or RET Temp), the Priority 2 set of boilers
will fire first/next based on runtime. This has the effect of
flipping the Priority of the sets.
Stopping Boilers:
When a boiler is to be stopped (water temp is above the
heating band), the MASTER checks the HeatNet boilers it
has available. The MASTER boiler then looks at which
boilers are returning Priority 1 firing status (set on a boiler
in: (SETTINGS: FIRING MODE: MIXED BOILERS
LAST
(
example
) If the Stop condition for Priority 1 is met, the
MASTER or MEMBER boiler that are configured as
Priority 1 with the highest runtime will be stopped
LAST
(
example
). If the stop condition and SHED DELAY time are
met, all the remaining Priority 1 set of boilers, will stop
based on runtime. If the Stop condition changes and/or is
not met (such as with: OA T or RET temp), the Priority 2
set of boilers will stop first/next based on their highest
runtime.
A boiler’s firing Priority can be designated as such in:
SETTINGS: FIRING MODE: FIRING PRIORITY:
PRIORITY menu on each boiler. A Priority of ‘1’ is the
highest Priority, a ‘
2
the lowest (default is always 2).