DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3
Page 95
In mixed boiler size configurations, more than (2) boilers in a
system, or when “bumps” in the temperature occur as boilers are
added and subtracted, this value may need adjustment. The
adjustments will help produce smooth temperature control when each
boiler is started and stopped. This method ensures that, once a new
boiler starts to fire, and holds its fire rate at the minimum setting, it
does not add its BTU output to a boiler already firing at 100%. The
boilers cannot be fired starting @ 0%, but start at a minimum
(example: 20%) and introduce a minimum amount of BTUs into the
system. Section: SETUP & OPERATION
The MOD MAX value is also applied when using the AA terminal
for High Fire and when using the 4-20 mA input for direct
modulation. When these demands for heat are used, the maximum
modulation the boiler can obtain when first starting is equal to the;
ADVANCED SETUP: MODULAR BOILER SET: MOD MAX –
LAST FIRE:. The timer value ADVANCED SETUP: MODULAR
BOILER SET: ADD BOILER DELAY is used in conjunction to
limit the modulation for this amount of time. Once the boiler has
fired and the ADD BOILER DELAY time expires, the full
modulation is available. This change is a protective means for
extending the life of the heat exchanger which may consistently be
exposed to thermal stress.
If MODULATION MODE is set to ADAPTIVE on the Master
boiler, the Master lowers the system modulation rate of all currently
running boilers before a newly started boiler enters the Main Valve
state. Upon entering the Main Valve state of a newly fired boiler, the
Master waits the DELAY RELEASE time before allowing the PID to
resume modulation control. With MOD MODE set to ORIG KN,
The Master boiler keeps firing at the current modulation rate when a
new boiler is added and lets the PID adjust modulation rate
accordingly.
If drop down is set to ON PILOT and MOD MODE = ADAPTIVE,
and when a newly added boiler starts, the system waits until it enters
its PILOT state before bring the system modulation down. This
allows for the system to prepare for the new energy that is to be
introduced. If DROP DOWN is set to immediately, the system
modulation is lowered as soon as the newly added boiler is called.
Once the Main Valve opens on the newly added boiler and the MOD
MODE = ADAPTIVE the Master waits this amount of time before
releasing the PID to control modulation. This allows for the newly
added boiler to accumulate some soak time.
This is a global delay controlled by the Master boiler. It is
comparable to the MODULATE DELAY setting, but this is a local
setting on each boiler.
LOFO: Boilers are fired Last On, First Off starting with Lead Boiler
FOFO: Boilers are fired First On, First Off
TRUE: Boilers are fired based on the runtime they report back to the
Master boiler. Boilers with the least runtime are fired first and boilers
with the most runtime are stopped first.
MIXED: Different types of boilers can be mixed in a system and
fired based on (2) Priority sets. Boilers are started and stopped with
in the Priority sets based on their runtime hours.
When the firing rotation is based on runtime, this value represents
the interval in hours of runtime before rotation occurs. Boiler to
Boiler.
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