DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3
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FAULT will stop the boiler when the Delta T has exceeded its
setting.
WARNING will allow the boiler to continue running, but produce
the Warning message.
*Settings are AUTO if running DELTA HIGH/LOW protection.
This is the maximum differential temperature the heat exchanger can
see before the LIMIT RATE feature is activated, and a log entry is
made.
*Not Available when operating in DELTA HIGH/LOW protection.
Limit to Half Rate: When set to YES, and the maximum differential
temperature (delta T) has been exceeded, the fire rate called for is cut
in half. In other words: if we are calling for 80% modulation and
have exceeded the delta T, the boiler will only fire at 40%. The delta
T needs to drop 10F below the maximum delta T to reset this limit.
The message “½ INPUT” will be displayed on a member boiler and a
Master Boiler will display the Modulation % for the system even
though it is running at ½ of this rate. This method helps protect the
heat exchanger from damage due to excessive delta T’s. If this
Master boiler is running
This setting is used by the Master boiler to select which Return
sensor temperature to send to all Member boilers. The Return
temperature will then be used by the Member boilers (usually non-
condensing) to determine if they can be called by the Master to run.
If a System Return sensor is available on the Master, set this setting
to SYS RET. If only a Return sensor is available, set to RETURN.
SYSTEM RETURN,
RETURN, OFF
This setting is used by a Member boiler (primarily a non-condensing
type) to determine which return sensor to look at when determining
if it is safe to fire. Its purpose is to keep non-condensing boilers from
firing in a condensing mode.
SYS RET the boiler will use the Return temperature sent from the
MASTER boiler.
RETURN the boiler will use its own Return sensor. If it is set to
OFF, then this feature will not be used.
If a sensor is selected, then the Boiler will determine if the Return
sensor’s temperature is below the TEMP< XXX setting in the
following menu. If the Return temperature is lower, the boiler will
take itself offline from the Master. Informing the Master that it can’t
run. The message “blr offline” will be displayed in the Status screen.
Setting determines where the TEMP DISAB return sensor’s
threshold temperature disables the boiler from firing.
EXTENDED POST
PURGE TIME:
This time may be used to remove condensation that is still present on
the heat exchanger after the boiler has finished running. The time
may be adjusted to 600 seconds (10 minutes). Unlike the 10 second
fixed post purge time the extended post purge time may be
interrupted by a call for heat.
If the extended post purge is active, an ‘*’ will be displayed next to
“STANBY *”. This indicates that the boiler is still ready to run, but
is completing an extended post purge. As always, the STATUS
screen will display the meaning of the ‘*’. In this case: EXTEND PP.
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