Johnson Controls MR12DR230-1C User manual

Electrical Control Cabinets

Including digital controller

Introduction

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

Order No. P-CR-E

General 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.

2CR1

Dimensions (in mm)

220

140

110

DIN electrical cabinet

(12 or 18 modules)

240

140

122,5

370

125

DIN electrical cabinet

(24 or 36 modules)



52.5

2.07”

52.5

2.07”











2.76”

118

4.65”

1.78”

DIN Rail control enclosure

12 modules 164 275

18 modules 269 380

24 modules 164 275

36 modules 269 380

1.97”

∅6

0.24” 2000

78.74”

A99B-9108 / A99BB-200C Sensor

Wiring Instruction

All wiring must be in accordance with local

regulations and national rules

These controllers are designed for use as an

operating control. When an operating control

failure would result in personal injury or loss of

property, it is the responsibility of the installer to

wire a separate backup control (e.g. a freeze

protection thermostat) in order not to use the

controller as an operating and safety device.

WARNING

When wiring and servicing make sure that:

•the electric supply to the actuator is

switched off to avoid possible damage to

the equipment, personal injury or shock.

•you do not touch or attempt to connect or

disconnect wires when electric power is on.

CR1 3

Positive temperature cold room

Defrost functions

Defrost is initiated and terminated by a timer. The

user sets the interval between successive cycles and

its duration.

During the defrost cycle, the display can show

either the last measurement before this cycle or

the setpoint. You can also delay the normal

display function after the defrost cycle has

ended.

Manual defrost is possible by pushing a key on the

controller keypad.

Fan management functions

You can choose whether the fan is to be run in

parallel with the compressor or whether it should

remain constantly ON. In this case the fan will be

ON during defrost. This will decrease defrosting

duration.

Pump down selection

A selector is available to choose between the start

stop strategy for the compressor.

Condensing fan

On the 3-phase models, two terminals are

available to field connect a condensing fan.

Digital input functions

All defrost controllers are equipped with a digital

input performing the following functions:

•Shut-OFF: If the contact is open for a preset

time, all outputs are de-energised and an

alarm message is displayed.

•External alarm: Display shows AL, the Alarm

output is switched ON, all other functions will

perform as normal

•Door open: In this case the High alarm will

be disabled, other functions will perform as

normal.

Note:

A detailed list of available parameters and their

description can be found at the end of this

documentation.

Positive Temperature Cold Room Cabinet

Selection table:

Item code Power supply Compressor Evap. Fan Cond.

Fan Cabinet

size Shipping

weight

V ac Φ

ΦΦ

ΦPower

AC-3 Amps Amps Amps modules Kg

CR-PS037-1 230 1 0,37 kW 5 1,6 - 12 2,2

CR-PS075-1 230 1 0,75 kW 8 1,6 - 12 2,2

CR-PS110-1 230 1 1,1 kW 10 3,2 - 12 2,2

CR-PS150-1 230 1 1,5 kW 12 4,8 - 12 2,2

CR-PT150-1 400 3 1,5 kW 3,5 3,2 3 18 3,2

CR-PT250-1 400 3 2,5 kW 5,7 3,2 3 18 3,2

CR-PT400-1 400 3 4,0 kW 8,5 4,8 3 18 3,2

CR-PT550-1 400 3 5,5 kW 11,5 4,8 3 18 3,2

CR-PT750-1 400 3 7,5 kW 15,5 4,8 3 18 3,2

Fan and

compressor

switched in parallel Continuous

fan

Solenoid valve and

compressor

switched in parallel Pump down

4CR1

Wiring diagram

Positive temperature cold room single phase model

Valve

Pump

down

reaker

1P+N

Circuit

~ 400 V

Breaker

Contactor

Fan

230 Volts

Contact

pump

down

A99

1L1 3L2 5L3

2T1 4T2 6T3

I> I> I>

A1 1L1 3L2 5L3

2T1 4T2 6T3A2

Compressor

3 ~ 400 Volts

MR12DR230

B1 ADA

N13 7 4NNNN4’

13N

24N

Alarm

230V~

0,5 A

8T4

7L4

21 22

3’

Fan

Compressor

CB1

Ambient Sensor

Cond. Fan /

Door frame

Positive temperature cold room three phase model

CR1 5

Negative temperature cold room

This control is equipped with two sensors, one for the

control of the refrigeration unit, the other senses the

evaporator temperature.

Defrost functions

Defrost cycle is initiated by a timer and

terminated either by temperature or time,

whichever comes first.

The defrost function includes the following

parameters:

•Type of defrosts (Hot gas or electrical heating).

•Interval time to adjust defrost frequency.

•Type of defrosts termination: time or temperature.

•Defrost end temperature.

•Maximum defrosts duration.

You can stop the compressor for an additional

configurable period called dripping time. This will

allow the evaporator to dry prior to resuming normal

operation.

In case of evaporator sensor failure, defrosts

cycle will be terminated by the maximum defrost

duration.

During defrost the display can be configured to show the

last measurement before defrost or the setpoint.

Fan management functions

Through the controller, you can choose whether

the fan is to be run in parallel to the compressor

or constantly ON. In any case the fan is switched

OFF during defrost.

After defrost, the fan can resume its work after a

preset time or after the evaporator temperature

has dropped below a user-settable temperature.

Condensing fan or door frame heater

On the 3-phase models, two terminals are

available to field connect a condensing fan or a

door frame heater to avoid the cell door sticking.

Digital input functions

All defrost controllers are equipped with an

additional digital input which can be configured to

perform the following functions:

•“Shut-OFF” function.

•External alarm function.

•“Door open” function.

Pump down selection

A selector is available to choose between the

start stop strategy for the compressor

Note:

A detailed list of available parameters and their

description can be found at the end of this

documentation.

Negative Temperature Cold Room Cabinet

Selection table:

Item code Power

supply Compressor Evap.

Fan Cond. Fan/

Door frame

heater

Defrost Cabinet

Size Shipping

weight

V ac Φ

ΦΦ

ΦPower

AC-3 Amps Amps Amps Amps modules Kg

CR-NS037-1 230 1 0,37 kW 5 1,6 - 8 12 2,5

CR-NS075-1 230 1 0,75 kW 8 1,6 - 12 12 2,5

CR-NS110-1 230 1 1,1 kW 10 3,2 - 12 12 2,5

CR-NS150-1 230 1 1,5 kW 12 4,8 - 16 12 2,5

CR-NT150-1 400 3 1,5 kW 3,5 3,2 3 12 18 3,5

CR-NT250-1 400 3 2,5 kW 5,7 3,2 3 12 18 3,5

CR-NT400-1 400 3 4,0 kW 8,5 4,8 3 15 18 3,5

CR-NT550-1 400 3 5,5 kW 11,5 4,8 3 15 18 3,5

CR-NT750-1 400 3 7,5 kW 15,5 4,8 3 15 18 3,5

Solenoid valve and

compressor

switched in parallel Pump down

6CR1

Wiring diagram

Negative temperature cold room single phase models

Valve

Pump

down

Defrost

230 V ~

reaker

1P+N

Circuit

~ 400 V

Breaker

Contactor

Fan

230 Volts

A99

Contact

pump

down

A99

1L1 3L2 5L3

2T1 4T2 6T3

I> I> I>

A1 1L1 3L2 5L3

2T1 4T2 6T3A2

Compressor

3 ~ 400 Volts

MR15DR230

1011B1 ADAB2 A

N13 7 4NNNN4’

13N

24N

Alarm

230V~

0,5 A

8T4

7L4

21 22

N20

3’

Compressor

CB1

Cond. Fan /

Door frame

Ambient Sensor Evaporator Sensor

Negative temperature cold room three phase models

CR1 7

Negative temperature cold room with three phase defrost

Selection table:

Item code Power

supply Compressor Evap.

Fan Cond. Fan /

Door frame

heater

Defrost Cabinet

Size Shipping

weight

V ac Φ

ΦΦ

ΦPower

AC-3 Amps Amps Amps Amps modules Kg

CR-NDT150-1 400 3 1,5 kW 3,5 3,2 4 3 x 5 24 4,1

CR-NDT250-1 400 3 2,5 kW 5,7 3,2 4 3 x 9 24 4,1

CR-NDT400-1 400 3 4,0 kW 8,5 4,8 6 3 x 10 24 4,1

CR-NDT550-1 400 3 5,5 kW 11,5 4,8 6 3 x 12 24 4,1

CR-NDT750-1 400 3 7,5 kW 15,5 4,8 6 3 x 16 24 4,1

Wiring diagram:

Valve

Pump

down

Defrost

230 V 3~

reaker

1P+N

Circuit

~ 400 V

Breaker

Contactor

Fan

230 Volts

A99

Contact

pump

down

A99

1L1 3L2 5L3

2T1 4T2 6T3

I> I> I>

A1 1L1 3L2 5L3

2T1 4T2 6T3A2

Compressor

3 ~ 400 Volts

MR15DR230

1011

B1 ADAB2 A

N13 74NNNN4’

13N

24N

Alarm

230V~

0,5 A

8T4

7L4

2121

21 22

2222

3’

1/ 2 3/ 4 5/6

2/1 4/3 6/5

1L1 3L2 5L3

2T1 4T2 6T3 8T4

7L4

Circuit

Breaker

7/8

Compressor

Contactor

Defrost

Compressor

CB1

Ambient Sensor Evaporator Sensor

Cond. Fan /

Door frame

Negative temperature cold room three phase Compressor and three phase Defrost models

8CR1

Negative temperature cold room with three phase defrost and evaporator fan

Selection table:

Item code Power

supply Compressor Evap.

Fan Cond. Fan /

Door frame

heater

Defrost Cabinet

Size Shipping

weight

V ac Φ

ΦΦ

ΦPower

AC-3 Amps Amps Amps modules Kg

CR-NFDT150-1 400 3 1,5 kW 3,5 3 x 2 5 3 x 5 36 5,3

CR-NFDT400-1 400 3 4,0 kW 8,5 3 x 2 5 3 x 10 36 5,3

CR-NFDT750-1 400 3 7,5 kW 15,5 3 x 2 5 3 x 16 36 5,3

Wiring diagram

Valve

Pump

down

Defrost

230 V 3~

Fuses

reaker

Circuit

~ 400 V

Breaker

Contactor

A99

Contact

pump

down

A99

1L1 3L2 5L3

2T1 4T2 6T3

I> I> I>

A1 1L1 3L2 5L3

2T1 4T2 6T3A2

Compressor

3 ~ 400 Volts

MR15DR230

1011

B1 ADAB2 A

N13 7 4NNNN4’

Alarm

230V~

0,5 A

8T4

7L4

21 22

Pressure

switch

HPBP

3’

1L1 3L2 5L3

2T1 4T2 6T3 8T4

7L4A1

Circuit

Breaker

Compressor

Contactor

Defrost

Compressor

CB1

Ambient Sensor Evaporator Sensor

Cond. Fan /

Door frame

Fuses

Main

Switch

WIRING DIAGRAM FOR:

CR-NFDT150-1 / CR-NFDT400-1 / CR-NFDT750-1

Circuit

~ 400 V

Breaker

Contactor

1L1 3L2 5L3

2T1 4T2 6T3

I> I> I>

A1 1L1 3L2 5L3

2T1 4T2 6T3A2

Fan

8T4

7L4

Fan

3 ~ 400 Volts

1L1

3L2

5L3

7L4

Negative temperature cold room- three phase Compressor, Defrost and Evaporator Fan

CR1 9

Description of each parameter

Setpoint :

is defined as the relay cut OFF.

Hy Hysteresis

This is the difference between the temperature

at which the compressor output is switched OFF

and the temperature at which the output is

switched ON. This is an absolute value, related

to the setpoint.

Example:

Cooling Setpoint = 4 ºC

Differential = 2 K.

The compressor is switched

ON when the temperature

goes over 6 ºC, and is turned

OFF when the temperature

decreases to 4 ºC.

LL/HL Lower & Higher setpoint limit

The setpoint value cannot be adjusted outside

the limits defined by these parameters, to avoid

improper setpoint setting by the user.

CC Anti short cycle protection

This parameter prevents the compressor from

being turned ON / OFF too often. The value that

you set is the minimum time between two

subsequent switches ON of the output.

Cooling demand

Comp. output

Anti cycle timer

Co Deep freezing time

This is the time for which the compressor is

forced ON when pressing the deep freezing

cycle key from the faceplate.

AH High temperature alarm:

High temperature alarm value relative to

setpoint. If your set point is at 4ºC and you want

an alarm 5 K above setpoint, it will be triggered

at 9ºC.

AL Low temperature alarm:

Low temperature alarm value relative to setpoint.

If your set point is at 4ºC and you want an alarm

3 K below setpoint, it will be triggered at 1ºC.

Ad Alarm differential:

Useful to avoid alarm oscillations.

For example:

Setpoint = 4ºC,

Max. Temperature alarm = 6 K,

Alarm differential = 2 K.

In this case, when the cold room temperature

exceeds 4+6 = 10ºC for a time greater than

parameter At the alarm is activated; when

temperature drops below 4+6-2 = 8ºC the alarm

is reset

At Alarm time delay:

Delay between the detection of the temperature

alarm and the activation of the alarm sequences.

This is useful to prevent temporary conditions

from causing an alarm. Furthermore, the

controller automatically ignores the temperature

alarm condition in the following cases:

- for 20 minutes after the power-ON

-during defrost and for 20 minutes after the

defrost-end.

dF Defrost function:

Select the type of your installation and the way

defrost is performed

0 = Electrical defrost (Compressor OFF)

1 = Hot gas defrost (Compressor ON)

dE Defrost end function:

Select the defrost termination type:

0 = timer based, set with parameter dd

In this case the evaporator sensor is not

required and the fan will restart base on time.

1 = temperature based, set with parameter dt

Note: in any case defrost ends after the time set

on parameter dd.

dt Defrost termination temperature:

Used only when parameter dE =1. When the

evaporator temperature reaches this value,

defrost automatically ends.

di Defrost interval time:

This is the time between two subsequent defrost

cycles. This timer will initiate every defrost cycle.

dd Maximum defrost duration:

If defrost end by time has been selected

(parameter dE=1) defrost cycle will stop after this

time, even if the end temperature has not

reached parameter dt.

When defrost interval time is 1 hour, the

maximum duration is limited to 40 min.

dC Dripping time:

After defrost is terminated, the compressor is

stopped to allow the evaporator to drip.

Hysteresis

Cooling Setpoint T°C

10 CR1

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