Nortec NHPC User Manual

77 | Troubleshooting
No. Display
Message
LED System Detected Cause Corrective Action(s)
W28
Demand signal
instability
Demand swinging
from low to high
rapidly
1 Improper Proportional
and Integral settings in
control
1 Adjust proportional and
integral settings to
reduce swings in
demand signal.
2 Control humidistat
installed too close to
diffuser or doorway to
un-humidified space
2 Install humidistat so that
it senses air
representative of space
being humidified.
3 Defective control 3 Replace defective
control
W29
Limit signal
instability
Limit signal
swinging from low
to high rapidly
1 High limit humidistat
too close to steam
distributor
1 Locate the high limit
humidistat a minimum of
10 feet (3 m) from the
distributor.
2 High limit humidistat
setpoint too low
2 Adjust the high limit
setpoint to 85% or more.
3 Improper Proportional
and Integral settings in
control
3 Adjust proportional and
integral settings to
reduce swings in
demand signal.
4 Defective control 4 Replace defective
control
W30
Modbus remote
disable
Network
shutdown
message
1 Network signal received
by humidifier to shut
down.
1 Normal operation for
humidifier on network
control Contact network
administrator to enable
humidifier.
W43
Keep warm
active
No demand in
last 2 hours
1 Humidifier configured to
keep cylinder water
warm
1 Normal operation for
humidifier configured to
keep cylinder warm. See
Operation Chapter, User
Defined Settings to
change configuration.
W44
Demand signal
short cycling
Safety loop short
cycling
Demand signal
cycling on and off
Safety loop is
cycling On/Off too
frequently
1 The humidifier has
detected short cycling
and reduced capacity
to stabilize operation.
1 Shortcyc set to On. If
feature is not desired
change configuration in
“User Defined Settings”
level of software.
2 humidifier oversized 2 Change the manual
capacity limit to 50% in
the Control Setting level
of software.
W45
3 High limit too close to
distributor or control in
air subjected to
humidity swings
3 Locate high limit at least
10 ft (3 m) from
distributor. Move control
to space representative
of space being
humidified.
4 Damaged controls 4 Replace any damaged
controls.

Nortec NHPC Specifications

General

Brand	Nortec
Model	NHPC
Category	Humidifier
Language	English