Advanced M52 Microprocessor User's Guide
ADVANCED M52UMCT2019 COLOR
10
Humidifier stops when:
“On/Off/Drain” switch is switched "Off" or “Drain”
Loss of demand
Loss of air flow
Humidifier Service Alarm intervention.
PID
The M52 microprocessor uses PID control logic to maintain the set point conditions. The following
parameters are adjustable so the controller can be fine-tuned to specific site conditions.
Dead band, temp. humid. dead band
Cool prop. band
Heating prop. band
Humidifying prop. band
Dehum. prop. band
Integral time temp
Integral time hum.
Internal Safety Controls
Fuses (60 Hz), circuit breakers (50 Hz) on all components
Fan overload relay (Vertical floor mount, VFM systems only)
Air proving switch (Vertical floor mount, VFM systems only)
Dirty filter switch (Vertical floor mount, VFM systems only)
High pressure refrigerant (manual reset)
Low pressure refrigerant
Internal thermal protection compressor
High temp cut out for heater
High water level sensor/ current transducer
Compressor elapse timer
Crank case heaters
External Optional Safety Controls
Fire stat or Smoke detector terminals 19 and 20
EPO terminals 19 and 20
On/Off Control
Local Mode:
When the controller is set to Local Mode, On/Off control of the unit is controlled by the keypad
When the controller is set to Remote Mode, On/Off control can also be controlled by a remote signal
through terminals 15 and 16. When this is active, On/Off control of the unit cannot be controlled by
the keypad
Timer Mode:
When the controller is set to Timer, On/Off control follows the time schedule programmed on the
controller. Unit can be set to be On, Off or Relax. Relax mode cause the microprocessor to control
using the RELAX deadbands which are programmable. In this mode the fan continues to operate.
Back up Capability
Standby Enable:
Each unit sends an output to start a back up unit in the event of an alarm condition as configured in the
Alarm Response menu. Terminals 11 and 12
Standby Start:
Each unit accepts an input signal to start regardless of its On/Off mode state at terminals 17 and 18
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