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