G
eneral features
Controller
Based on the field proven MR family of
controllers, it integrates specific features
required in cold rooms.
Positive temperature applications:
MR12DR230-1C
•
Pump down management (selectable)
•
Fan
option
Negative temperature applications:
MR15DR230-2C
•
Pump down management (selectable)
•
Fan
management
For additional information please refer to MR
documentation
Sensor
The CR series uses Johnson Controls A99
temperature sensor. Its accuracy, ± 0.5 K over a
range from -20ºC to 75ºC, and its gas tight
packaging makes it the best sensor for
refrigeration applications.
For details please refer to A99 documentation.
Circuit Breaker for motor
(Three phase models only)
Selected for its high protection against short
circuit, it features phase disconnection, thermal
protection and manual On/Off. The adjusted
protection value is independent of temperature
condition inside your cabinet.
For details on the short circuit protection, see
information page 13.
Circuit Breaker for controller, defrost
and fans
Specifically selected for virtually all applications it
features a high protection and an appropriate
magneto-thermal characteristic in function of the
application.
Positive temperature applications:
Mainly inductive loads: Curve D
Negative temperature applications:
Mainly resistive loads: Curve C
Negative temperature applications three
phase defrost only:
Mainly inductive loads: Curve D
Defrost Line: Curve C
For details, see information page 13.
Contactor
A VDR protection across the coil extends the life
of the controller relays. The contactor, being four
(4) poles, allows you to customise the cabinet to
your application. This additional contact could be
used to drive a condensing fan (up to 3 Amps) or
for signalling its operation.
Selected for use in AC-3 category: three-phase
motor with cage with a nominal speed of 1500
rpm.
Cabinet
Thanks to a specifically designed MR, there is
sufficient space in the cabinet in order to extend
your application.
Wiring is easily accessible.
The high protection level (IP65) allows you to
install this cabinet in harsh environment such as
outdoors. The polycarbonate material has a high
shock resistance, which could be necessary
during handling or at installation.
The class 2
insulation gives you the safety
required by all agencies.
2
CR1
Catalogue Section 9
© 2000 Johnson Controls, Inc.