37 | Operation
On/Off or Modulating Control (J10)
The RH’s output can be controlled by either an On/Off humidistat or a modulating humidistat.
To set the RH to operate with a modulating humidistat remove Jumper J10. (Factory setting =
jumper Installed , On/Off operation)
J10 Removed– Modulating operation, the controller monitors the demand signal on
terminal point 4 of the control terminal strip and adjusts humidifier output to match it.
J10 Installed - The RH is configured for On/Off operation. The controller will ignore any
modulating signals even if they are connected.
Modulation Offset (J13)
The RH controller can be configured to work with a modulating humidistat with 4-20 mA or 2-10
VDC output. Modulation offset can be configured with jumper 13. (Factory setting = Jumper
Removed, 0-10 VDC or 0-20 mA control signal)
J13 Removed – Controller is configured for a 0-10 VDC or 0-20 mA control signal.
J13 Installed – Controller is configured for a 2-10 VDC or 4-20 mA control signal.
Note: For mA control a 500Ω register is required between terminals 3 and 4 on the low voltage
control terminal.
Table 6: Control Jumper Configuration
Resulting Control J10 J13
On/Off Installed No Affect
Modulating 0-10 VDC or 0-20 m
Removed Removed
Modulating 2-10 VDC or 4-20 m
Removed Installed
Ground Fault Interrupt (GFI) (J15)
Ground current leakage can occur when the humidifier performs drains. With jumper J15 the
RH can be configured to turn off the power to the electrodes whenever a drain takes place.
J15 Removed – The power relay is on during drains to control cylinder water concentration.
J15 Installed – The power relay is turned off during drains to control cylinder water
concentration.
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