HeatNet Smith Series, Руководство пользователя, Страница: 79 / 82

APPENDIX B HeatNet Control REV 1.38-1
Page 79
Line # 4 Message Description
LOW RETURN TEMP
If the return temperature is less than 130 degrees ° F condensing
may be occurring.
SHUTDOWN UV TEST
After 24 hours of continuous runtime the ignition control module
needs to check it’s UV detection circuit. An orderly shutdown and
then a restart will occur. This log entry indicates that this has taken
place. This is not a fault.
STACK HIGH TEMP
This log entry occurs when the boiler’s stack temperature is greater
than 550 °degrees
°
F.
HIGH LIMIT EXCEEDED
If the mechanical aguastat trips due to it’s high temperature setting
having been exceeded, this log entry will occur.
IGNITION CTRL ALARM
The ignition control module has faulted while performing an ignition
sequence, or while monitoring flame during normal operation.
IRI Alarm
If the gas valve proving circuit ( if equipped) detects a gas pressure
problem.
DOMESTIC HOT WATER
Indicates a call for DHW heating by either the DHW sensor or an
external thermostat.
LOW WATER CUTOFF
VAR FREQ DRIVE
GAS PRESSURE
SPARE 4
OP LIMIT MECH
These log entry faults are result of the interlocks connected to the
24VAC interlock inputs: J11A and J11B.
Low Water Cutoff = Low water condition in boiler
Var Freq Drive = The Variable Frequency Drive Interlock has tripped
Spare 4 = User installed interlock,
Op Lim Mech = An external operator (aquastat).
START FAILED, RETRY
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. The Log will report the retries.
OP LIMIT REMOTE
The is the firmware Operating Limit as defined in
SETUP:SETPOINTS:OPERATE LIM. When the Supply temperature
exceeds this value, this event is logged.
OPEN OUTSIDE SENSOR,
SUPPLY SENSOR,
RETURN SENSOR,
HEADER SENSOR,
DHW SENSOR
If one of the 10k thermistor sensors was detected to be open or not
connected, this fault will be logged.
SHORTED OUTSIDE SENSOR,
SUPPLY SENSOR,
RETURN SENSOR,
HEADER SENSOR,
DHW SENSOR
If one of the 10k thermistor sensors was detected to be shorted this
fault will be logged.