M52 Microprocessor User's Guide
M52UMCT Oct-03 10
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 and motor
High temp cut out for heater
Boiler dirty for humidifier
Compressor elapse timer
Crank case heaters
External Optional Safety Controls
Fire stat terminals 19 and 20
Smoke detector terminals 19 and 20
Liquid detector J51-01 02 and 03
On/Off Control
Local Mode:
When the controller is set to Local Mode, On/Off control of the unit is controlled by the keypad
Remote Mode:
When the controller is set to Remote, On/Off control is controlled by a remote signal through
terminals 15 and 16.
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 17 and 18
Standby Start:
Each unit accepts an input signal to start regardless of its On/Off mode state at terminals 11 and 12
Note: On/Off mode:
When operating in a Co-Work network all On/Off mode options are synchronized. Therefore, turning
off a unit, either by the touch screen when in Local, by the remote on/off at terminals 15 and 16 when
in Remote, or through the schedule when in Timer mode will turn off all units in that network.
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