44
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
System alerts
Table 44-1:
Alerts menu
Alert label Description
Does alert
auto-clear?
Red Alerts
Tank temp sensor failed Tank temp sensor has failed. No
Tank overtemp
Fault occurs at boiling temperature plus 25 °F (13 °C). All units are put into a keep cool state where
fill and drain cycles operate to keep tank cool. First resolve any safety issues, then resolve whatever is
causing the problem. Restart the controller to clear the alarm.
No
Space RH signal out of range RH signal is out of range. Yes
Dew point signal out of
range
Dew point signal is out of range. Yes
Demand signal out of range Demand signal is out of range. Yes
Duct RH signal out of range Duct RH signal is out of range. Sensor may be faulty. Yes
Aux temp sense out of range Auxiliary temp sensor signal is out of range. Yes
Check water probe Water probe head is dirty, faulty, or miswired. Yes
Faulty water probe Water probe readings are suspect, likely caused by scale on probe. No
Excess fill time Fill valve has been on too long during initial tank fill. Bottom probe is not in contact with water. Yes
Excess refill time Re-filling is taking too long. Top probe is not in contact with water. Yes
Tank not draining
Drain valve has been open for the prescribed amount of time based on the humidifier model, and water is
still touching the low water probe.
Yes
Excessive boil time
Humidifier continues to add water when there is no demand, signifying humidifier is continuing to make
steam. Humidifier is put into a keep-cool state where fill and drain cycles operate to keep tank water from
boiling. First resolve any safety issues, then resolve whatever is causing the problem. Restart the controller,
and clear the alarm.
No
No SDU airflow
Airflow proving switch in the SDU (space distribution unit, a fan-based dispersion assembly) indicates no
airflow. No steam is produced while alarm is active.
Yes
Overtemp cutout
Overtemp cutout circuit has opened. First resolve any safety issues, then resolve whatever is causing the
problem. Restart the controller to clear the alarm.
No
Blocked flue Flue pressure switch indicates positive pressure in flue. Burner will not ignite when this fault is active. Yes
Burner 1 or 2 fault
Burner tried one or more times to light and did not succeed. Once this fault is active, Vapor-logic locks out
the burner and does not try to light it again until fault is cleared. Other burners can run.
No
Ignition mod. 1 or 2 fault
Ignition module has not opened the gas valve. Once this fault is active, Vapor-logic locks out the ignition
module and does not try to start it again until fault is cleared. Other ignition modules can run.
No
Blower 1 or 2 fault Blower is turning at less than the specified minimum RPM. Unit not allowed to run. Yes
Gas valve 1 or 2 fault Gas valve is on when it should be off. Unit not allowed to run. Yes
Continued
OPERATION
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