Modbus Installation | 22
Control Signal Setting
By default the humidifier operation is configured on a hardwired control signal supplied through
the unit terminal strip. This can be changed to allow the humidifier to function entirely through
its Modbus interface.
To adjust this setting:
1 Press the Menu key to access the menu.
2 When prompted for a password, enter 0335 using the arrow keys. Confirm the password
with set.
3 Select the Control Settings menu and press the Set key. The following settings can be
adjusted:
Analog: Use hardwired control signal
Digital: Write control signal through Modbus interface
Demand: Use a demand control signal
RHp: Use a sensor value and proportional
RHpi: Use a sensor value and proportional-integral control band
Single CH: Use a signal channel control signal
Dual CH: Use a dual channel control signal
Setting not relevant when writing control signal through Modbus.
Note: Refer to the CONTROL SETTING section of the NH Series Installation and Operation
Manual for more information on the above settings.
4 Press Esc repeatedly to return to the home screen when complete.
This procedure is summarized below:
Menu > 0335 > Control Settings >
Source: Analog or Digital
Reg Mode: Demand, RHp, or RHpi
Mod Mode: Single CH or Dual CH
CNT Type: As required
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