WIRING CONNECTIONS HeatNet Control V3
Page 82
OPEN ******* SENSOR:
If the open sensor fault is displayed, the sensor in the
position reported was originally detected, but has since
opened. The boiler will shut down on any OPEN sensor
except the OUSTSIDE AIR sensor.
SHORTED ******* SENSOR:
If the shorted sensor fault is displayed, the sensor in the
position reported was originally detected, but has since
shorted. The boiler will shut down on any SHORTED
sensor except the OUSTSIDE AIR sensor.
AIR SWITCH:
If the IGNITION control closes its blower relay, the control
does not see the PILOT relay close within (2) minutes, and
the AIR PRESSURE switch is made, this message will be
displayed. This alarm protects the boiler from freeze ups
being caused by a blower bringing in cold outside air with
no fire. It usually indicates that the blower never started or
the air switch never closed.
CALL SERVICE:
If the H-Net control closes the last interlock string entering
the ignition control and the ignition control never closes its
Blower Relay, the H-Net control will wait 2 minutes. The
H-Net control will then retry for the duration of the local
pump post purge time and then retry the ignition sequence.
During this time “retry strt” will be displayed in the status
screen. After (5) attempts the H-Net control will lock out
and display call service.
DELTA TEMPERATURE WARNING:
If the temperature difference across the boiler and measured
from RETURN water to SUPPLY water exceeds
“EXCHGR DELTA” this message will be displayed. This
can be set to an alarm condition in the AUX FUNCTIONS
menu. High delta temperatures can result in damage to the
boiler.
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