Nortec MH Series - Manual (Page 55)

Operation | 52
Controls
The Controls submenu configures the type of control that will be used to operate the MHTC. The
MHTC can be configured for External control, 24V On/Off control, Internal Proportional control,
and Internal Proportional and Integral control. Each of the four control methods require different
parameters for configuration. The selections displayed in the Controls submenu depend on
what is selected for Hum. Control.
Hum. Control = External
When External control is selected the
MHTC will stage to match demand
based on an external control signal.
Set Signal Source to Analog or
Modbus. Set Controlsign to match
the output of the controller being
used.
Hum. Control = 24VOn/Off
24Von/Off control is not supported.
To operate the MHTC as On/Off set
Hum. Control to External and
Controlsign to 5VDC. Install a jumper
from terminal 6 to terminal 4 of the
control terminal strip. Install On/Off
controls in series between terminal 1
and 2.
Hum. Control = Int. (P) or (PI)
When Internal control is selected the
MHTC will calculate the required
output based on RH signal supplied
to it. Set Signal Source to Analog or
Modbus. Set Controlsign to match
the output of the RH transmitter
being used. Configure Setpoint to
the desired humidity. P-Band and
Integr-Time should not normally be
adjusted.
Power Limit
Manually reduces the maximum
output of the MH. Can be used in
cases where capacity is to high and
the unit short cycles On/Off. Use
Up/Down arrows to set the value
then press Set.
Inlet Flush
Sets the MHTC to flush supply lines
when there is no demand to prevent
water from becoming stagnant. Drain
time = length of time the lines will
be flushed. Periodic Int = time
between flushes.