| Вид документа | Бюлетень виробу |
|---|---|
| Виробник | JCI |
| Код документа | mr-series-refrigeration-temperature-control |
| Група обладнання | MR1 Refrigeration Controller |
| Сторінок | 12 |
| Мова документа | англійська |
| Розмір файлу | 0.3 МБ |
Текст документа
Master Catalog 125
Temperature Controls Section A
Product Bulletin
Issue Date 0618
MR Series Refrigeration Temperature Controls
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.
Figure 1: MR4 DIN Rail Mount and Panel Mount
Refrigeration Temperature Controls
Features and Benefits
Programmable Functions Allows adjustment of control settings to meet
application needs
Alarm Management Provides alarm codes and an alarm output
Functions relay that can be used to trigger a remote
alarm or dial-out modem
Easily Readable LED Displays temperature and other functions
Display quickly and clearly
Programming Button Allows user to disable programming buttons
Lockout and deter accidental or unauthorized changes
Accurate, Interchangeable Provides accurate control performance with up to
Temperature Sensor 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 LEDs
© 2018 Johnson Controls 1
Code No. LIT-125199 www.penncontrols.com
A pplications
IMPORTANT: All MR Series Controls are Typical applications include the following:
designed for use only as Table 1: Sample Applications
operating controls. Where an
operating control failure would MR1 MR2 MR4 Application
result in personal injury or loss of Cooling tower pump
property, it is the responsibility of control
the installer to add devices
(safety, limit controls) or systems Space and return air
temperature control
(alarm, supervisory systems) that
protect against, or warn of, Convenience store
control failure. coolers
Convenience store
All MR Series Controls perform temperature and alarm freezers
management. Some models have additional
Supermarket display
capabilities. cases for produce
Reach-in coolers
MR1 Series Controls
Walk-in coolers
The MR1 Series provides temperature and alarm
Freezers or coolers with
management functions. It can replace a temperature passive defrost, time-
control and digital temperature readout. based termination
Freezers with hot gas
MR2 Series Controls defrost (temperature or
time-based termination)
The MR2 Series provides temperature, alarm, and Freezers with electrical
defrost cycle management. The MR2 control performs defrost (temperature or
defrost cycle management using time-based, passive, time-based termination)
off-cycle defrost in refrigeration units. It can replace a
temperature control, a digital temperature readout, and All MR Series models use the Johnson Controls/PENN
a defrost timer. A99BB-200C temperature sensor. Refer to a specific
MR Series Control model installation bulletin for the
necessary information on installation, use, and
MR4 Series Controls servicing.
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.
2 A—MR Series Refrigeration Temperature Controls Product Bulletin
F unctions
The MR Series Controls offer a variety of refrigeration Sensor Failure Operation allows user to select how
and alarm management functions, which are listed the temperature control output contacts operate in the
below. Not all of these functions are available on every event of a sensor related failure. The MR Series
model. Control remains in the selected failure operation mode
until the failure is remedied.
Refer to the specific model MR installation bulletin or
contact your authorized Johnson Controls/PENN There are three options:
distributor or sales representative for functions, setting
ranges, switching, and ratings included on specific temperature control contact is always closed
models. temperature control contact is always open
temperature control contact is time cycled based
Temperature Management on the average On and Off times of the last
four cycles
Setpoint is the desired temperature (F or C)
programmed by the user. Many other function settings Temperature Sensor Offset allows the user to
are relative to setpoint temperature, which is compensate for temperature differences between
measured at the process temperature sensor. actual and displayed temperature, such as those
experienced when using long sensor leads.
When setpoint is reached, the temperature control
output contacts open, stopping the refrigeration On Temperature Units allows the user to select either the
cycle. Fahrenheit or Celsius temperature scale.
Display Refresh Rate establishes the time delay
Differential (or Hysteresis) establishes the difference (seconds) between updates of the temperature
(F or C) between setpoint and the temperature at display.
which the temperature control output contacts close,
beginning the refrigeration On cycle.
Alarm Management
High and Low Setpoint Stops are temperature
High Temperature Alarm establishes the temperature
setpoints (F or C) that define how high and low
relative to the setpoint (F or C) at which the control
setpoint may be adjusted. Setpoint stops deter
goes into a high temperature alarm condition.
unauthorized or accidental over-adjustment of
setpoint. Low Temperature Alarm establishes the temperature
relative to setpoint (F or C) at which the control
Anti-short Cycle Delay establishes the minimum time goes into a low temperature alarm condition.
(minutes) between the start of one On cycle and the
Alarm Differential establishes the difference
start of the next On cycle.
(F or C) between the temperature at which the alarm
contacts are closed and the temperature at which they
are opened.
Load Demand
Example (cooling):
Output Status
Setpoint = 40°F
Anti-short Cycle
High Temperature Alarm = 15F°
Timer Alarm Differential = 2F°
When the cooler temperature exceeds 40+15=55°F for
Figure 2: Anti-short Cycle Delay a time greater than the Alarm Time Delay setting, the
alarm message is displayed; however, it will not reset
Deep Freezing Time overrides setpoint temperature until the temperature drops below 40+15-2 = 53°F.
control and closes the temperature control output
contacts for a user-defined time (minutes). Typically,
this function is used to run the compressor
continuously during periods of high refrigeration load
to bring the sensed temperature below setpoint and
deep freeze the product.
A—MR Series Refrigeration Temperature Controls Product Bulletin 3
Alarm Time Delay establishes the time delay Display After Defrost establishes the time delay
(minutes) between reaching an alarm condition (high (minutes), after defrost termination, before the control
or low temperature) and closing the alarm contacts. displays the sensed temperature.
This function reduces alarm oscillation and nuisance
alarms caused by temperature changes that
temporarily exceed alarm setpoints. Evaporator Fan Management
Temperature alarm conditions are disregarded by the Fan Operation allows the user to select how the fan
MR Series Control during the first 20 minutes after operates – either continuously or only when the
power up, during the defrost cycle, and for 20 minutes compressor is running. (The evaporator fan is always
after the end of the defrost cycle. switched Off during the defrost cycle.)
Fan Start Up Delay establishes the maximum time
Defrost Cycle Management delay (minutes) after defrost termination, before the
fan contacts close and restart the fan (even if fan start
Defrost Type allows the user to select either electric temperature has not been reached.)
heater or hot gas defrost operation, depending on the
application. Fan Start Temperature establishes the evaporator
temperature setpoint (F or C) at which the fan
Defrost End Mode allows the user to select defrost contacts close and restart the evaporator fan after
termination based on either time or temperature. If defrost termination. If the start temperature is not
temperature is selected, defrost termination will occur reached, the fan is switched On after the time delay
after the time selected in maximum defrost duration, set in fan start up delay.
even if the selected temperature is not achieved.
Defrost Termination Temperature establishes the Binary Input
temperature setpoint (F or C) that ends the defrost
cycle, when the user has selected temperature for the Binary Input Function allows the user to select how
defrost end mode. the binary input will activate the control output or alarm
contacts. The user can select to disengage this
Defrost Interval establishes the time (hours) between function. The user can also select one of three options
defrost cycles. When the defrost interval is 1 hour, the if the binary input contact is open for a time longer
maximum defrost duration cannot be set at more than that set through the binary input time delay:
than 40 minutes. The temperature control, defrost, and fan outputs
are switched Off, an alarm message is displayed,
Maximum Defrost Duration establishes the and the alarm output is switched On. This could be
maximum time (minutes) of the defrost cycle. A setting used with a high-pressure switch to warn of
of 0 disables the defrost cycle. system malfunction.
Dripping Time establishes the time (minutes) that An alarm message is displayed and the alarm
water is allowed to drain away from the evaporator coil output is switched On.
after defrost termination and before the compressor An alarm message is displayed, the alarm output
and evaporator fans are started for the next freeze is switched On, the fan output is switched Off, and
cycle. high and low temperature alarms are disabled.
This could be used with a door switch to warn of a
First Defrost After Power Up establishes the time door that remains open.
delay (hours) until the first defrost cycle after starting
or restarting the refrigeration system. If this function is Binary Input Time Delay establishes the time delay
turned Off, the first defrost occurs after defrost (minutes) between binary input signal and control
interval. output response to the binary signal.
Display During Defrost defines the temperature
(F or C) displayed during the defrost cycle. The user
may select to display either setpoint or the sensed
temperature just prior to the start of the defrost cycle.
4 A—MR Series Refrigeration Temperature Controls Product Bulletin
Table 2: Functions and Setting Ranges
MR1 MR2 MR4 Function Setting Range
Setpoint -40 to 158°F (-40 to 70°C)
Hysteresis (Differential) 1 to 9°F (1 to 9°C)
High Setpoint Stop Low Setpoint Stop to 158°F (70°C)
Low Setpoint Stop -40°F (-40°C) to High Setpoint Stop
Anti-short Cycle Delay 0 to 9 minutes
Deep Freezing Time 0 to 99 minutes
Sensor Failure Operation 0 = compressor On
1 = compressor Off
2 = based on last four cycles
Temperature Sensor Offset -20 to 20°F (-20 to 20°C)
Temperature Units Used 0 = °C
1 = °F
Display Refresh Rate 1 to 99 seconds
High Temperature Alarm 0 to 50°F (0 to 50°C)
Low Temperature Alarm -50 to 0°F (-50 to 0°C)
Alarm Differential 1 to 9°F (1 to 9°C)
Alarm Time Delay 0 to 99 minutes
Defrost Interval 1 to 99 hours
Maximum Defrost Duration 0 to 99 minutes
Dripping Time 0 to 99 minutes
First Defrost After Power Up Off, 0 to 99 minutes
Display During Defrost 0 = last reading
1 = setpoint
Display Delay After Defrost 1 to 99 minutes
Binary Input Function 0 = none
1 = compressor Off, alarm On
2 = alarm On
3 = fan Off, alarm On
Binary Input Time Delay 0 to 99 minutes
Defrost Type 0 = electrical
1 = hot gas
Defrost End Mode 0 = time
1 = temperature
Defrost Termination Temperature 32 to 68°F (0 to 20°C)
Fan Operating Function 0 = parallel with compressor
1 = always On
Fan Start Up Delay (After Defrost) 0 to 99 minutes
Fan Start Temperature After Defrost End -22 to 41°F (-30 to 5°C)
A—MR Series Refrigeration Temperature Controls Product Bulletin 5
D isplay Panel
The display has three LED digits and a minus (-) Alarm Codes
indication. It displays a temperature range from
–40 to 158°F (-40 to 70°C) in increments of 1°F or °C. The MR Series Controls can display several alarm
codes that are used to assist in troubleshooting control
errors. Alarm codes exist for the following conditions:
Temperature
temperature sensor failure
Evaporator Fan Defrost Output
Status Status Status
LED
evaporator sensor failure
LED LED
Manual
Defrost
high temperature alarm
Up
Button Button low temperature alarm
Enter Down
Button Button
program failure
three binary input codes
Figure 3: Front Display Panel for Panel Mount MR4
Series Control Button Lockout
The buttons on the panel may be deactivated in order
to deter accidental or unauthorized modifications.
Evaporator Temperature
Fan Defrost Output
Status Status Status
LED LED LED Self-Test Procedure
The self-test procedure allows the user to verify that
Up Button the LEDs and outputs of a unit are operating correctly
before the control is put into service. The control must
Down Button
not be wired to any equipment other than input power
when the self-test is initiated.
When the self-test is initiated, power is cycled to each
Manual Defrost Button
of the relays, to the status LEDs, and then to the
segments of the large LED display. The MR Series
Figure 4: Front Display Panel for DIN Rail Mount control shuts off after completing the self-test. To put
MR4 Series Control the MR Series control back into normal operation,
cycle power to the control.
Depending on the model, the front display panel may
contain fewer status LEDs and/or buttons than shown
here.
6 A—MR Series Refrigeration Temperature Controls Product Bulletin
MR1 Temperature Control Table 4: Rating Table
The MR1 Series provides temperature and alarm Rating Category 120 240 24
management functions. It replaces a temperature VAC VAC VDC
control and digital temperature readout. The alarm
Horsepower 1/4 1/2 ---
circuit requires a separate external power source
(40 VDC, 100 mA maximum). Full Load Amperes 5.8 4.9 ---
Process
Locked Rotor 34.8 29.4 ---
Temperature Amperes
Alarm
Sensor Sensor + Inductive (non-motor) 8 8 8
-
Common Amperes
S1 SC A1 A2 Pilot Duty VA 275 450 ---
Terminal Not Used Internal to Alarm circuit transistor is 40 VDC, 100 mA maximum.
Control Alarm requires separate power source.
V1 V2 C Fr Power supply is 24 VAC.
Compressor Refer to Rating Table Temperature Management Functions
Power for more information.
Supply
Setpoint
Differential (Hysteresis)
Figure 5: MR1 DIN Rail Control
Low Setpoint Stop
Table 3: MR1 Ordering information High Setpoint Stop
Product Code Description
Number Anti-short Cycle Delay
Deep Freezing Time
MR1DR24-11C MR1 DIN Rail Mount Control,
A99BB-200C sensor included Sensor Failure Operation
Shipping Weight 0.75 lbs. (340 g) Temperature Sensor Offset
Temperature Units Used
Display Refresh Rate
Alarm Management Functions
High Temperature Alarm
Low Temperature Alarm
Alarm Differential
Alarm Time Delay
A—MR Series Refrigeration Temperature Controls Product Bulletin 7
MR2 Temperature/Defrost Control Table 6: Rating Table
The MR2 Series provides temperature, alarm, and Rating Category 120 240 24
defrost cycle management. The MR2 control performs VAC VAC VDC
defrost cycle management using time-based, passive,
Horsepower 1/4 1/2 ---
off-cycle defrost in refrigeration units. It can replace a
temperature control, a digital temperature readout, and Full Load Amperes 5.8 4.9 ---
a defrost timer. The alarm circuit requires a separate Locked Rotor 34.8 29.4 ---
external power source. Amperes
Sensor Inductive (non-motor) 8 8 8
Common Amperes
Process Binary Pilot Duty VA 275 450 ---
Temperature Input
Sensor Binary Alarm
Common Power supply is 24 VAC.
Alarm requires separate power source.
S1 SC D CD A1 A2
Terminal Not Used
Temperature Management Functions
Internal to Control Setpoint
V1 V2 C Fr Differential (Hysteresis)
Refer to Rating Table
for more information. Low Setpoint Stop
Power Compressor
Supply High Setpoint Stop
Anti-short Cycle Delay
Figure 6: MR2 DIN Rail Control Deep Freezing Time
Sensor Failure Operation
Internal to Control Terminal Not Used Temperature Sensor Offset
Temperature Units Used
C Fr A1 A2 V1 V2 D SC S1 Display Refresh Rate
Compressor Alarm Power Alarm Management Functions
Supply Sensor
Common High Temperature Alarm
Refer to Rating Table Binary
for more information. Input
Process
Temperature
Low Temperature Alarm
Sensor Alarm Differential
Alarm Time Delay
Figure 7: MR2 Panel Mount Control
Defrost Management Functions
Table 5: MR2 Ordering information
Defrost Interval
Product Code Description
Maximum Defrost Duration
Number
Dripping Time
MR2PM24-11C MR2 Panel Mount Control,
First Defrost After Power Up
A99BB-200C sensor included
Shipping Weight 0.53 lbs. (240 g) Display During Defrost
MR2DR24-11C MR2 DIN Rail Control, Display Delay After Defrost
A99BB-200C sensor included
Shipping Weight 0.79 lbs. (360 g) Binary Input Functions
Input Function Selection
Input Time Delay
8 A—MR Series Refrigeration Temperature Controls Product Bulletin
MR4 Temperature/Defrost Control Table 8: Rating Table
The MR4 Series provides temperature, alarm, Rating Category 120 240 24
defrost, and evaporator fan management. The MR4 VAC VAC VDC
Series provides hot gas or electric heat defrost
Horsepower 1/4 1/2 ---
control, with defrost termination based on time or
temperature. The MR4 Series consolidates the Full Load Amperes 5.8 4.9 ---
functions of a temperature control, a digital Locked Rotor 34.8 29.4 ---
temperature readout, a defrost cycle timer, and a Amperes
defrost termination device. The alarm circuit requires Inductive (non-motor) 8 8 8
a separate external power source. Amperes
Pilot Duty VA 275 450 ---
Process Temperature Sensor
Sensor Binary Input Binary Common Power supply is 24 VAC.
Common
Evaporator
Relay outputs must not exceed 20 amperes total
Alarm
Temperature connected load.
Sensor Alarm requires separate power source.
S1 SC D CD S2 A1 A2
Terminal Not Used Internal to Control Temperature Management Functions
Setpoint
V1 V2 C1 Fr C3 Fn C2 Df Differential (Hysteresis)
Low Setpoint Stop
Power Compressor Evaporator Defrost High Setpoint Stop
Supply Fan
Refer to Rating Table for more information. Anti-short Cycle Delay
Deep Freezing Time
Figure 8: MR4 DIN Rail Control Sensor Failure Operation
Temperature Sensor Offset
Temperature Units Used
Refer to Rating Table for more information.
Display Refresh Rate
Internal to Control Alarm Management Functions
C Fr A1 Df Fn V1 V2 D S1 SC S2 High Temperature Alarm
Low Temperature Alarm
Common Defrost Power
Sensor Alarm Differential
Supply Binary
Alarm Evaporator
Input
Common Alarm Time Delay
Compressor Fan Evaporator Temperature
Process Temperature Sensor Sensor Defrost Management Functions
Defrost Type
Figure 9: MR4 Panel Mount Control Defrost End Mode
Defrost Termination Temperature
Table 7: MR4 Ordering Information Defrost Interval
Product Code Description Maximum Defrost Duration
Number Dripping Time
First Defrost After Power Up
MR4PM24-12C MR4 Panel Mount Control,
Display During Defrost
2 A99BB-200C sensors included
Shipping Weight 0.90 lbs. (410 g) Display Delay After Defrost
Fan Operating Function
MR4DR24-12C MR4 DIN Rail Mount Control,
Fan Start Up Delay (After Defrost)
2 A99BB-200C sensors included
Shipping Weight 1.17 lbs. (530 g) Fan Start Temperature After Defrost End
Binary Input Functions
Input Function Selection
Input Time Delay
A—MR Series Refrigeration Temperature Controls Product Bulletin 9
2 3/4 2 1/8
2 11/16 1/4 (70) (52.5)
(68) (6)
1 1/8 1 3/8
(28) (35)
2
(50)
2 5/16
(58) 13 11
1 4
16 16
(45)
(118)
2 3/4
(70) 3
(75) 78 3/4
(2000)
Figure 11: DIN Rail Control, in. (mm)
Figure 10: Panel Mount Control and
A99 Sensor, in. (mm)
10 A—MR Series Refrigeration Temperature Controls Product Bulletin
Table 9: A99 Temperature Sensor Ordering Information
Product Code Number Temperature Range Cable
A99BB-200C -40 to 212oF (-40 to 100oC) 6 1/2 ft (2 m), Silicon sensor w/ PVC cable
A99BB-300C -40 to 212oF (-40 to 100oC) 9 1/2 ft (3 m), Silicon sensor w/ PVC cable
A99BB-500C -40 to 212oF (-40 to 100oC) 16 1/3 ft (5 m), Silicon sensor w/ PVC cable
A99BB-600C -40 to 212oF (-40 to 100oC) 19 ½ ft (6 m), Silicon sensor w/ PVC cable
A99BA-200C -40 to 212oF (-40 to 100oC) 6 1/2 ft (2 m), Silicon sensor w/ shielded cable
Table 10: Electrical Ratings of Contacts
Rating Category 120 VAC 240 VAC 24 VDC
Horsepower 1/4 1/2 ---
Full Load Amperes 5.8 4.9 ---
Locked Rotor Amperes 34.8 29.4 ---
Inductive (non-motor) 8 8 8
Amperes
Pilot Duty VA 275 450 ---
Relay outputs must not exceed 20 Amperes total connected load.
Open collector transistors on MR1 alarm circuit has a maximum rating of 40 VDC 100 mA.
Alarms require separate external power source.
Power supply is 24 VAC.
A—MR Series Refrigeration Temperature Controls Product Bulletin 11
Specifications
Product MR Series Refrigeration Temperature Controls
Power Requirements 3.7 VA @ 24 VAC, 50/60 Hz Class 2 (20-30 VAC)
Accuracy ±1.8°F (±1°C)
Ambient Conditions Operating: 14 to 140°F (-10 to 60°C); 0 to 95% RH (non-condensing)
Storage: -22 to 176°F (-30 to 80°C); 0 to 95% RH (non-condensing)
Dimensions (H x W x D) Panel Mount: 1.38 x 2.95 x 2.68 in. (35 x 75 x 68 mm)
DIN Rail Mount: 4.65 x 2.76 x 2.07 in. (118 x 70 x 52.5 mm)
Agency Listings UL Recognized: File E194024, CCN XAPX2
Canadian UL Recognized: File E194024, CCN XAPX8
FCC Compliant per Class A Digital Device, Part 15
Canadian DOC Compliant per Class A, Radio Interference Regulations
Shipping Weight Panel Mount: 0.33 lb. (150 g) without A99B-200C sensor, 0.46 lb. (209 g) with sensor
DIN Rail Mount: 0.26 lb. (118 g) without A99B-200C sensor, 0.39 lb. (177 g) with sensor
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult Johnson Controls/Penn Refrigeration Application Engineering at (414) 274-5535. Johnson Controls shall not be liable
for damages resulting from misapplication or misuse of its products.
www.penncontrols.com
® Johnson Controls and PENN are registered trademarks of Johnson Controls in the
United States of America and/or other countries. All other trademarks used herein are the property
of their respective owners. © Copyright 2018 by Johnson Controls. All rights reserved.
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