Table 3. NH System Messages (cont)

NHTC Display Message

LED state

System Action

Symptom Diagnosed

 

 

 

 

 

 

W27: Safety loop instability

YEL

The safety loop is interrupting

A security control is causing the safety

 

 

 

humidifier operation.

loop to switch on and off too rapidly.

 

 

 

 

 

 

W28: demand signal instability

YEL

The demand signal is swinging

The demand signal is unstable.

 

 

 

from low demand to high

 

 

 

 

demand too quickly.

 

 

 

 

 

 

 

W29: limit signal instability

YEL

The limit signal is swinging from

The limit signal is unstable.

 

 

 

low demand to high demand too

 

 

 

 

quickly and the humidifier

 

 

 

 

cannot respond.

 

 

 

 

 

 

 

W30: Modbus remote disable

YEL

The humidifier is being

The humidifier has been disabled by a

 

 

 

controlled via the network, not

network message.

 

 

 

locally.

 

 

 

 

 

 

 

W43: Keep warm active

YEL

This is a customer selectable

The humidifier is in standby mode.

 

 

 

feature to keep the cylinder

The cylinder may energize at any

 

 

 

water warm.

time.

 

 

 

 

 

 

W44: Demand signal short

YEL

The cylinder automatically

The demand signal is cycling on and

 

cycling

 

reduces the humidifier output to

off too frequently.

 

 

 

stabilize operation.

 

 

 

 

 

 

 

W45: safety loop short cycling

YEL

The cylinder automatically

The demand signal is cycling on and

 

 

 

reduces the humidifier output to

off too frequently.

 

 

 

stabilize operation.

 

 

 

 

 

 

 

W46: RH high warning

YEL

An alarm indication is

RH levels higher than the limit set

 

 

 

generated.

have been detected. The humidifier

 

 

 

 

should not be operational with this

 

 

 

 

warning activated.

 

 

 

 

 

 

W47: RH low warning

YEL

The humidifier is operating and

RH levels lower than the limit set have

 

 

 

an alarm indication is

been detected. The humidifier should

 

 

 

generated.

be operational with this warning

 

 

 

 

activated.

 

 

 

 

 

 

W49: wrong cylinder installed

YEL

An alarm indication is

The cylinder installed is not the

 

 

 

generated.

recognized type for the humidifier.

 

 

 

 

 

 

E50: Modbus Timeout

RED

Systems shuts down.

Time window for Modbus has elapsed.

 

 

 

 

 

 

10-40

Page 64 2008-08-28

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Nortec NH Series installation manual W27 Safety loop instability

NH Series specifications

The Nortec NH Series stands as a remarkable line of heating and cooling equipment designed specifically for commercial and industrial applications. Renowned for its efficiency, reliability, and innovation, the NH Series is engineered to meet the demanding needs of various environments, including hospitals, educational institutions, and office buildings.

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