DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3
Page 91
RUN IN LOCAL IF:
H-NET COMM LOST
If this entry is set to ON and the Member boiler does not see any
communications coming from the Master boiler, this boiler will run
in LOCAL. The boiler will continue to run in LOCAL until
communications are re-established or this entry is set to OFF.
This entry may be set to one of the temperature sensors: SUPPLY,
HEADER, RETURN, or turned OFF (default). If this entry is set to a
sensor and the temperature falls below TEMP, the boiler will
automatically start and run the water temperature up to the LOCAL
Setpoint and then shut OFF.
This is the temperature that the selected sensor must fall below for
the boiler to start.
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.
This is the maximum differential temperature the heat exchanger can
see before the LIMIT RATE feature is activated, and a log entry is
made.
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. 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 the 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.
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, the Boiler will determine if the Return
sensor’s temperature is below the TEMP< XXX setting. If the Return
temperature is lower, the boiler will take itself offline from the
Master. Informing the Master that it cannot 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.
To Next Page
Loading...
Need help?
General
