Nortec MES2 - Manual (Page 29)

Operation | 26
Capacity Adjustment
The Capacity adjustment potentiometer can adjust the capacity of the humidifier between 100%
and 20% of its rated output. (Factory setting = 100% output)
Figure 22: Capacity Potentiometer Adjustment
Mains Voltage Select (J1 to J6)
The jumper setting must be set to match the operating voltage of the humidifier. The MES2 is
factory calibrated to provide maximum output over a range of operating voltages depending on
the setting of J1 to J6. Changing the jumper location sets the fill off amps of the humidifier to
correspond to that required at its operating voltage. One jumper only must be installed on J1 to
J6. See Table 6 for correct jumper placement.
High Water Sensor Voltage (J8 and J9)
The MES2 detects high water by measuring current flowing to its high water sensor pin (Cylinder
plug with white marker). To insure accurate detection of current, the High Water Sensor (HWS)
circuit must be configured using J8 and J9 to match the operating voltage. A jumper must be
installed on either J8 or J9, not on both. See Table 6 for correct jumper placement.
On/Off or Modulating Control (J10)
The MES2’s output can be controlled by either an On/Off humidistat or a modulating
humidistat. To set the MES2 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. For
mA control install a 500 ohm resistor across pins 1 and 2 of P5 control signal input terminal.
J10 Installed - The MES2 is configured for On/Off operation. The controller will ignore any
modulating signals even if they are connected.
Modulation Offset (J13)
The MES2 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). See Table 6 for correct jumper placement.
Caution: Never adjust jumpers other than those listed in this section. Other jumpers are
factory set and must not be changed.
100% 20%