Johnson Controls MR15DR230-2C - User Manual

Electrical Control Cabinets
Including digital controller
I
ntroduction
Designed to facilitate installers work, this range
of electrical cabinet is intended for use in cold
rooms working at positive or negative
temperatures and powered either with single
phase or three phase power supply.
Based on specifically designed controllers, it
incorporates all control functions as required by
modern cold room units, such as compressor
control, defrost management, fan management,
alarm function and solenoid valve for “pump
down”.
It also includes all the safety equipment needed
such as circuit breakers for the compressor and
for the controller.
Particular attention has been given to the
accessibility so that the installation time will be
reduced to a minimum. Space has been left
available for customisation.
12 modules (front) and 36 modules (back)
models
Features and Benefits
!
Power rating from :
0,37 to 1,5 kW in single phase
1,5 to 7,5 kW in three phases
Cover most of standard applications.
!
Standard DIN rail components
Easy maintenance and servicing.
Availability of components.
!
Most wiring integrated on the controller
Increased quality and reduced space occupancy.
!
Specifically designed controller to
manage Pump Down
Better match application need.
!
Accurate and interchangeable
IP 68 sensor
Accurate control performance.
No re-calibration needed.
!
IP 65 standard DIN polycarbonate cabinets
High mechanical resistance.
Installation in harsh environment.
!
Integrate circuit breaker for motor and
controller
No time lost defining appropriate protection
!
In field extension
Possibility to field connect a condensing fan or a
door frame heater.
!
Main Switch
To power down the whole cabinet.
Increased safety protection.
Refrigeration Controls Catalogue
Catalogue Section
9
Product Bulletin
CR1
Issue
0101
© 2000 Johnson Controls, Inc. Catalogue Section 9
Order No. P-CR-E

Johnson Controls MR15DR230-2C Specifications

General

Model	MR15DR230-2C
Power Supply	230 VAC
Input Frequency	50/60 Hz
Output	Relay
Number of Outputs	2
Enclosure Rating	IP20
Agency Approvals	CE, UL
Series	MR
Type	Controller
Product Type	Controller
Input Voltage	230 VAC
Communication Protocol	BACnet
Operating Temperature	0° to 50°C (32° to 122°F)
Storage Temperature	-40 to 70 °C
Humidity Range	10 to 90% RH
Mounting	DIN rail

Summary

Introduction to Electrical Control Cabinets

Features and Benefits

General Features of Control Cabinets

Controller Details

Details the integrated controller based on the MR family, featuring specific cold room functions.

Cabinet Dimensions and Wiring Safety

Wiring Safety Precautions

Emphasizes safety precautions for wiring and servicing, stressing power disconnection.

Positive Temperature Cold Room Functions

Negative Temperature Cold Room Functions

Defrost Functions

Details defrost parameters like type, interval, termination, and duration for negative temperature applications.

Fan Management

Pump Down Selection

Parameter Descriptions: Temperature and Alarms

Setpoint and Hysteresis Settings

Defines setpoint, hysteresis, and limits for temperature control parameters.

Alarm Configuration

Details high/low temperature alarms, alarm differential, and alarm time delay settings.

Defrost Configuration

Explains defrost function type, end conditions, interval, duration, and dripping time.

Parameter Descriptions: Defrost, Input, Fan, and Sensor

Defrost and Display Settings

Covers delayed first defrost, display options during defrost, and post-defrost temperature display.

Digital Input and Fan Control Settings

Details digital input functions, time delays, fan operation, and fan start-up after defrost.

Sensor Failure and Unit Settings

Parameter Reference Table

Temperature Control Parameters

Lists temperature control parameters with their ranges, defaults, and MR12/MR15 compatibility.

Alarm Parameters Table

Lists alarm parameters, their ranges, defaults, and MR12/MR15 compatibility.

Defrost Parameters Table

Lists defrost parameters, their ranges, defaults, and MR12/MR15 compatibility.

Digital Input Parameters Table

Fan Control Parameters Table

Circuit Breaker Characteristics

General Circuit Breaker Specs

Motor Circuit Breaker Specs

Repair, Replacement, and Spare Parts

Digital Controllers and Sensors

Lists digital controller and A99 sensor models, specifications, and suppliers.

Contactors and Motor Protection

Circuit Breakers and Main Switch

Product Specifications

Power, Frequency, and Protection

Operating Conditions and Accuracy

Electrical Control Cabinet Installation Guide

High Pressure and Low Pressure Connection

Describes the connection for HP/LP pressure switches to the cabinet.

Pump Down Operation Setup

Evaporator Fan Function Selection

Wiring Connections Guide