Manufacturer: Johnson Controls |
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Description: Defrost ctrl w/relay&2snsrs
Category: Electrical Controls
MR Series
Defrost Control Modules
Description
The MR Series Controls are versatile,
microprocessor-based, multifunction,
programmable temperature controls.
Depending on the model chosen, the MR
Series Controls can also manage alarm,
defrost cycle (active or passive defrost), and
evaporator fan functions.
The MR Series Controls have large red LED
displays. These compact controls are
available in panel mount and DIN rail mount
varieties. The MR Series Controls use the
A99B temperature sensors, which allow
remote mounting of the display unit.
All MR Series Controls perform temperature
and alarm management. Some models have
additional capabilities.
MR4 Series Controls
The MR4 Series provides temperature, alarm,
defrost, and evaporator fan management.
The MR4 Series provides defrost cycle
management with hot gas or electric heat
defrost and defrost termination based on time
or temperature. The MR4 Series consolidates
the functions of a temperature control, a
digital temperature readout, a defrost cycle
timer, and a defrost termination device.
Features
• programmable functions allow adjustment
of control settings to meet application
needs
• alarm management functions provide local
alarm display and an alarm output relay
that can be used to trigger a remote alarm
or dial-out modem
• easily readable LED display displays
temperature and other functions quickly
and clearly
• programming button lockout allows user to
disable programming buttons and deter
accidental or unauthorized changes
• accurate, interchangeable temperature
sensor provides accurate control
performance with up to 300 feet of wiring
(an adjustable temperature offset is
provided for longer wiring)
• self-test procedure checks control
operation by cycling all outputs and testing
all LED's
Replaces Part Numbers: MR4PMUHV-12, CARMR4PMUHV-12