70
Fault Isolation
2583701_C_EN_1812_Nortec-GS_OM
Nortec GS
Humidifier
Table 14: General Troubleshooting – Nortec GS Humidifier
Problem
Probable Cause
Corrective Action(s)
Nothing happens when the
On/Off switch is turned On.
Incorrect voltage, or no voltage.
– Check the disconnect switch in the supply line.
– Check the fuse between the transformer and the On/
Off switch.
Step-down transformer not out
-
putting 24 VAC.
– Check the fuse.
– Measure and confirm 24 VAC on the transformer
primary connections. Replace the transformer, if
necessary.
Humidifier will not produce
steam, or does not reach RH
setpoint value.
Safety loop is open.
– Check if the message "Safety Loop" is displayed in
the operating status area of the Home screen.
– Check if there is 24 VAC supply at low voltage termi
-
nal strip pin "2".
– Check that all On/Off devices connected to low volt
-
age terminal strip pins "1" and "2" are wired properly,
and their contacts are closed when they should be.
Output is limited by the high limit
humidistat signal.
– Check if the high limit humidistat is installed too
close to the steam distributor. The recommendation
is five times the absorption distance or minimum
10 ft (3 m). Check the setpoint value for the high
limit – typically set at 80% RH.
No signal on Channel 1.
– Check voltage between low voltage terminal strip
pins "3" and "4". For a demand signal configuration,
the signal must be 27% of full scale signal for the
humidifier to start. For a transducer signal configura
-
tion, the signal must be lower than the setpoint value
for the humidifier to start.
No signal on Channel 2 (on units
set to "Dual").
– Check voltage between low voltage terminal strip
pins "3" and "5". For a demand signal configuration,
the signal must be 27% of full scale signal for the
humidifier to start. For a transducer signal configura
-
tion, the signal must be lower than the setpoint value
for the humidifier to start.
Capacity has been manually
limited.
Humidifier displays warning
or fault message.
The control software has de
-
tected an abnormal condition.
–
Refer to
"Nortec GS Warning and Fault List" on page 71
.
