Specifications
24
MP-3000 Controller
Temperature Controller:
Type
MP-3000 microprocessor with thermostat, digital thermometer,
programming keypad, mode indicators, LED display and LCD
display for displaying unit operating and cargo information
Setpoint Range -30.0 to +30.0 C (-22.0 to +86.0 F)
Digital Temperature Display -60.0 to +80.0 C (-76.0 to +176.0 F)
Controller Software (Original Equipment):
Version See controller identification decal
Defrost Initiation
Evaporator Coil Sensor
Manual Switch or Demand Defrost Initiation: Coil must be below
18 C (65 F). Defrost cycle starts when technician or controller
request defrost initiation.
Timed Defrost Initiation: Coil must be below 10 C (50 F). Defrost
cycle starts 1 minute after the hour immediately following a defrost
timer request for defrost initiation. For example, if the defrost timer
requests a defrost cycle at 7:35, the defrost cycle will start at 8:01.
Datalogger will record a Defrost event for each interval in which a
Defrost cycle is pending or active (i.e. both the 8:00 and 9:00 data
logs).
Demand Defrost
Demand defrost function initiates defrost when:
Temperature difference between the return air sensor and defrost
(evaporator coil) sensor is too large for 90 minutes
Temperature difference between the left hand and right hand
supply air sensors is too large and unit has operated for 90 minutes
since last defrost
Temperature difference between the supply air sensors and return
air sensor is too large
Defrost Timer: Chilled mode
Supply Temperature at 5.1 C (41.2 F) or Above: Every 8 hours of
compressor operation.
Supply Temperature at 5.0 C (41.0 F) or Below: Every 2.5 hours of
compressor operation. Defrost interval increases 0.5 hours each
timed defrost interval. Defrost synchronization creates step
intervals of 3, 4, 4, 5, 5, 6, 6 and 7 hours. Maximum time interval in
Chilled mode is 7 hours.
Defrost Timer: Frozen mode
Every 8 hours of compressor operation. Defrost interval increases 2
hours each timed defrost interval. Maximum time interval in Frozen
mode is 24 hours.
Defrost Timer: Reset to Base Time
Defrost timer resets if the unit is off more than 12 hours, setpoint is
changed more than 5 C (9 F) or PTI pre-trip test occurs.
Defrost Termination:
Defrost (Coil) Sensor
Chilled mode: Terminates defrost when coil sensor temperature
rises to 30 C (86 F); or exceeds 18 C (65 F) for 35 minutes (45
minutes if voltage is below 440V)
Frozen mode: Terminates defrost when coil sensor temperature
rises to 30 C (86 F); or exceeds 8 C (46 F) for 35 minutes (45
minutes if voltage is below 440V)
Termination Timer
Terminates defrost after 90 minutes at 60 HZ operation if coil
sensor has not terminated defrost (120 minutes at 50 Hz operation)
Power Off Turning U
NIT ON/OFF switch OFF terminates defrost
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