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100
Guardian
-
System Monitor and Speed Control
Actual size
Description:
The Coastal
Guardian
can be installed on any refrigeration system incorporating a Danfoss BD35 or
BD50 compressor, and replaces any existing thermostat. The unit comprises a black plastic panel measuring 5”w x 2”h
that requires a 4.5” x 1.5” cut out and a depth of 3”. The panel incorporates a Coastal MK II 12v Digital Thermostat, a
compressor speed adjustment knob, and a diagnostic fault LED. The panel is supplied with a 10’ thermostat sensor and a
10’ control cable that connects to a Danfoss compressor controller. Electrical hook up is made simple with slip on
electrical connectors, and the panel is fully protected by a 2 amp in line fuse. 24v models available on request.
Operation:
The Coastal
Guardian
performs three primary functions:
1. Controls and displays refrigerator or freezer box temperature and compressor operational status.
2. Provides automatic or manual compressor speed control for maximum possible system efficiency.
3. Gives audible and visual indication of temperature anomalies and system malfunction.
1.
The
Coastal MK II Digital Thermostat/Thermometer
is pre installed and is set to work as either a refrigerator or
freezer control with a user specified set point. Box temperature will be kept within two degrees (adjustable) of the set
point, and probe temperature is displayed continuously in degrees and tenths on the three segment red LED display. A
snowflake symbol is illuminated to indicate that the compressor is operating. Full instructions, with details on how to
adjust the temperature set point, differential, temperature scale (Fahrenheit or Celsius), and alarms, are included with
the thermostat. The Coastal MK II also features an emergency on off routine that is automatically activated if the
temperature probe should fail.
2.
Compressor speed
is controlled by adjusting the rotary knob. When set to the “AUTO” position and with the
Merlin
smart speed controller installed, compressor will automatically run at the most efficient speed. If a
Merlin
SSC is not installed, the “AUTO” setting is non operational, and the operator then manually sets the speed to the lowest
practical setting. The principle behind controlling compressor speed being that the longer and slower a compressor can
be run, the more efficient it will be, and the less energy it will use overall.
3.
The
Diagnostic LED
, labeled “FAULT”, will display one of five flashing error codes if a safety shut down of the
compressor should occur. Faults indicated are: Low voltage, Fan/Pump Overload, Compressor Non Start, Compressor
Low RPM, and Electronics Overload. Full details and a troubleshooting guide are provided.
Audible alarm
(buzzer) can be set to sound when temperatures exceed user specified high and low limits.
Visual alarms
are displayed for: Sensor Failure and High/Low Temperature Alarm.
Guardian
from
#VE-CGUA111
