EasyManua.ls Logo

Johnson Controls MR4PMUHV - User Manual

Johnson Controls MR4PMUHV
13 pages
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
Product/Technical MR4PMUHV
Issue Date July 25, 2002
© 2002 Johnson Controls, Inc. 1
Part No. 24-8790-18, Rev. D www.johnsoncontrols.com
Code No. LIT-125190
MR4PMUHV Electronic
Temperature/Defrost Control with Relay Pack
The MR4PMUHV Temperature/Defrost Control with
Relay Pack controls the temperature and defrost
cycles on commercial refrigeration and freezer
applications. The control allows a hot gas or electric
heat defrost cycle and uses time or temperature to
control defrost termination.
The MR4PMUHV Temperature/Defrost Control
incorporates temperature management, defrost
management, evaporator fan management, and alarm
management control functions. One convenient
package consolidates the functions of a thermostat, a
digital display, a timer, and a defrost termination
switch.
Figure 1: MR4PMUHV Electronic
Temperature/Defrost Control with Relay Pack
Features and Benefits
Single Package
Provides the functionality of multiple control
components at a cost-effective price.
Easily Readable Display
Displays main sensor or auxiliary sensor
temperatures; helps troubleshoot system.
Provides alarm codes.
Accurate, Interchangeable
Temperature Sensor
Provides accurate control performance with up to
300 feet (91 m) of sensor wiring. (A temperature
offset function may be set to accommodate
applications with longer sensor wire leads.)
Heavy-Duty Relays
Allow direct control of compressors, fans, and
heaters. Reduce installation time.
Nonvolatile Memory
Retains user-programmed settings in event of
power loss.
Alarm Management
Functions
Provide alarm codes and a relay to either
operate a remote alarm or trigger a dial-out
modem.
Question and Answer IconNeed help?

Do you have a question about the Johnson Controls MR4PMUHV and is the answer not in the manual?

Johnson Controls MR4PMUHV Specifications

MR4PMUHV-12C

Power IconPower
frequency60 Hz
power consumption5VA @240, 5VA @120
Operating Environment IconOperating Environment
ambient operating conditions+14 to +111°F (-10 to +44°C); derate 6.25% per 1°C from 45°C to 60°C; 0 to 95 % RH (non-condensing)
ambient storage conditions-22 to +176°F (-30 to +80°C); 0 to 95 % RH (non-condensing)
accuracy± 1.8F° ( ± 1C°)
Weight and Dimensions IconWeight and Dimensions
dimensions7.94 x 3.6 x 2.4 in. (202 x 92 x 61 mm)
shipping weight2.9 lb (1320g)
A99 sensor cable length6.6 ft (2m)

MR4PM12C-12C

Operating Environment IconOperating Environment
ambient operating conditions+14 to +140°F (-10 to +60°C); 0 to 95 % RH (non-condensing)
ambient storage conditions-22 to +176°F (-30 to +80°C); 0 to 95 % RH (non-condensing)
accuracy± 1.8F° ( ± 1C°)

RP4MRUHV-1C

Operating Environment IconOperating Environment
ambient operating conditions-40 to +111°F (-40 to +44°C); derate 6.25% per 1°C from 45°C to 60°C; 0 to 95 % RH (non-condensing)
ambient storage conditions-40 to +185°F (-40 to +85°C); 0 to 95 % RH (non-condensing)
accuracy± 1.8F° ( ± 1C°)

Summary

MR4 PMUHV Electronic Temperature;Defrost Control

Product Overview and Benefits

Overview of the control's function in refrigeration and highlights key features and benefits.

Operation

Temperature Management

Defines setpoints, differential, cycle delay, and sensor failure responses for temperature control.

Alarm Management

Configures high/low temperature alarms, alarm time delay, and alarm differential for alerts.

Defrost Cycle Management

Manages hot gas or electric heat defrost cycles and termination methods.

Evaporator Fan Management

Controls evaporator fan operation modes and start-up delays after defrost.

Additional Features

Keyboard Locking and Self-Tests

Enables keyboard locking for setting protection and initiates system self-tests.

Manual Operation Modes

Allows manual initiation of deep freeze and defrost cycles.

Control Module Front Panel

Details the LED display and buttons for programming and activating features.

Mounting

Mounting as a Single Unit

Instructions for mounting the MR4PMUHV control as one integrated unit.

Separating and Mounting Components

Guidance on separating, removing, and individually mounting control module and relay pack.

Wiring

Sensors and Binary Input Wiring

Details how to wire temperature sensors and binary input connections.

Relay Pack Wiring

Provides guidelines and diagrams for wiring the relay pack terminals.

Programming the Control

Control Module Usage and Access

Explains normal operation, display navigation, and how to lock/unlock programming access.

Changing Setpoint and Function Values

Guides users on modifying setpoint values and other control function settings.

Manual Control Operations

Procedures for initiating manual self-tests, defrost, and deep freeze cycles.

Control Functions

Temperature Management Functions

Details Setpoint, Differential, Cycle Delay, Deep Freezing Time, and Sensor Failure Operation.

Alarm Management Functions

Explains High/Low Alarms, Alarm Differential, and Alarm Time Delay settings.

Defrost and Fan Control

Defrost Cycle Management

Manages defrost mode, termination, timing, and display settings.

Evaporator Fan Management

Controls evaporator fan operation modes and start-up delays after defrost.

Binary Input Functions

Defines how relays respond to binary input signals and associated time delays.

Function Settings Reference

Programming Control Module Functions

Comprehensive table listing all programmable functions, their ranges, and factory-set values.

Alarm and Fault Display Codes

Display Codes and System Status

Lists alarm/fault codes, their conditions, and corresponding system status indications.

Ordering Information

Item Codes and Shipping Weight

Provides a table of item codes for ordering parts and their respective shipping weights.

Repair and Replacement

Relay Electrical Ratings

Fan Relay Ratings (SPDT)

Details electrical specifications for single-pole, double-throw fan relays.

Defrost & Compressor Relay Ratings (SPST)

Provides electrical ratings for single-pole, single-throw defrost and compressor relays.

Alarm Relay Ratings (SPST)

Lists electrical specifications for single-pole, single-throw alarm relays.

Technical Specifications

Product and Operational Specs

Summarizes product details, frequency, power, accuracy, and sensor input range.

Environmental and Agency Information

Covers operating/storage conditions, dimensions, agency approvals, and emissions compliance.