Sub-Zero CRC-2052 User Manual

COLD ROOM CONTROLLER

USER MANUAL

www.subzero.co

INDIA

CRC-2052

Index Index

01

CRC-2052 CRC-2052

02

Index Index

Introduction

Get to Know Your Controller

LED Indication.

5

8

Parameter List.

To set the quick freeze set point.

To set the Condenser set point.

To set cut out point of the controller for
Humidity.

QFS

CSET

HSET

9

9

10

Key Introduction

6

4

Fault Messages.

7

DESCRIPTION

PARAMETER

Pg.
No.

To set the cut-out point of the controller.

SET POINT

9

DESCRIPTION

PARAMETER

Pg.
No.

To set other parameter

10

To set allowable high temperature limit.

To set allowable low temperature limit.

To set the differential for compressor
restart.

P2

P3

P4

10

11

11

To set probe calibration.P5

12

To set time delay between relay restart
time.

P6

12-13

To set duration of defrost.P7

13

To set defrost frequency.

To set power on defrost delay.

To set type of defrost.

To set drip time for defrost.

To set defrost stop temperature.

To set type of computation for defrost
time.

P8

P9

P10

P11

P13

P12

13

13

14

14

15

14-15

To enable or disable humidity sensing. RH

15

To set allowable high humidity limit.H2

16

To set allowable low humidity limit.H3

16

To set differential (Hysterisis) for
humidity.

To set probe calibration for humidity.

To set time delay between relay restart
time for humidity.

To set quick freeze duration.

To set condenser logic.

To set condenser differential.

To set condenser probe calibration.

To set condenser on delay time.

To set condenser status at hot gas
defrost.

To set Evaporator Fan stop temperature.

To set Evaporator Restart Delay.

To set Evaporator Fan status at
compressor off.

To set Evaporator Fan differential.

To set Evaporator probe calibration.

H4

H5

H6

QFD

CND3

CND4

CND5

CND6

CND7

L1

L2

L3

L4

L5

16

17

17

18

18

18

19

19

19

20

20

20

21

21

To set Evaporator Fan status at Door
open condition.

L7

21

To enable / disable buzzer.BUZ

22

This parameter is used to set power on
delay for alarm.

AL

22

Under load limit for compressor current.C-UL

23

Over load limit for compressor current.C-OL

23

Under load limit for Heater / Solenoid.D-UL

23-24

Items Included.

5

9

To set Evap Fan status during defrost.L8

22

EXIT End of set mode

10

Current sensing delay.

C2

24

Introduction

04

Features:

CRC-2052

Index

03

CRC-2052

Index

DESCRIPTION

PARAMETER

Pg.
No.

To enable or Disable HP sensing.

D0

24

To enable or disable LP sensing.

D1

25

Fault sensing logic.

To set LP sensing delay.

To set reset mode for HP fault.

D2

D3

D4

25

25

26

To set Compressor Relay status on
Probe Failure.

To set On cycle at room probe fail.

To set Off cycle at room probe fail.

To set Display at defrosting.

Defrost duration during Coil probe failure.

E1

TON

TOFF

E7

E8

26

26

27

27

27

To set time delay to switch off the light .

To activate Solenoid Valve relay.

To change password.

To view Compressor run Hours.

Clear Compressor Run Hours.

To set Unit ID.

LD

PDN

PW

CRH

CCRH

ID

28

28

28

29

29

29

To activate Keypad Lock.

To enable/disable Power Switch.

To set display at power OFF mode.

LP

PO

PDIS

29

30

30

To restore default settings of the
controller.

FS

31

End of programming.

EP

31

Technical Data

32-33

Caution & Warranty

34-35

Suggested Connection Diagram

The CRC-2052 is single set point cold room controller. The
Sub-Zero CRC-2052 is aesthetically superior versions of
their predecessors.

A number of parameters are displayed alphanumerically to set
up the instrument for each specific function.

The controller controls the defrost in the system based on
either an electrical heater where the compressor is stopped, or
at cycle inversion using warm gas where the compressor
keeps on working.

There are safety features which include shutting down the
system incase of a fault from a pressure control or similar
device.

A series of “safety controls” (delay at start-up, minimum disable
time, minimum time between activation) protects the
compressors from close starts. In case of probe error or
temperature alarm, the instrument signals the event through
acoustic signal and by closing the relay contact. By pressing
the mute key, the buzzer is silenced.

Computer Connectivity over RS485 and Remote
monitoring(Optional).

Single Operation Quick Freeze Mode(Press QF Key for 2 sec),
set system in quick freeze mode which is time based for that
period new set point will be lower than running set point and
system will try to achieve that set point, after time period over
set point will be normal set point.

Over load limit for Heater/Solenoid.D-OL

24

Key Introduction

06

PRG

Amp

PROBE

Used to switch OFF/ON the controller.

Used to come mute the buzzer/Alarm & to exit any mode.

Used to increment/scroll in Program Mode.
When not in any mode if this key is pressed for 2 secs controller will
enter in display Probe mode where Condenser/Evap temperature &
RH can be viewed.

PRG

PROBE

Fault Log

Used to enter into the Set mode. Also used as enter key if controller
is in Set mode/program mode.

Used to enter in manual defrost and to stop defrost if
defrosting is ON.

Used to enter in fault log mode.

Used to enter in quick freeze mode.

Used to decrement/scroll in Program mode.
Used to enter into the program mode.

Used to enter in display Amp. mode where compressor and
defrost current can be viewed.

Used to switch OFF/ON the light.

CRC-2052

05

Get to Know Your Controller

Items included

NO.

1.

2.

3.

4.

QTY

ITEMS

CONTROLLER

CATALOGUE

NTC SENSOR 5 METER

1

3

1

4

8 X 38 SCREW WITH RAWL PLUG

CRC-2052

08

LED Indication

Messages Mode Discription

Comp. Relay On.
Comp. Relay Off.
Comp. Relay Timedelay.

Cond. Relay On.
Cond. Relay Off.

C

E

Evap. Relay On.
Evap. Relay Off.
Evap. Relay Timedelay.

Defrost Relay On.
Defrost Relay Off.
Defrost Relay Timedelay.

LSV Relay On.
LSV Relay Off.

Alarm Relay On.
Alarm Relay Off.

Controller is in drip time.

Humidifier On.
Humidifier Off.
Humidifier is in Timedelay.

Controller is in .
Controller is not in quick freeze mode.

quick freeze mode

Power Off.
Power On.

Light Relay On.
Light Relay Off.

R-phase present.
R-phase absent.

R

Y-phase present.
Y-phase absent.

Y

B-phase present.
B-phase absent.

B

Flashing

On
Off
Flashing

On
Off

On
Off
Flashing

On
Off
Flashing

On
Off

On
Off

On
Off
Flashing

On
Off

Off
On

On
Off

On
Off

On
Off

On
Off

On
Off

Controller is in emergency stop mode.
Controller is not in emergency stop
mode.

Emergency

Stop

07

High temperature alarm for Room means, room temperature is
equal or above the set value of P2 parameter.

Low temperature alarm for Room means, room temperature is
equal or below the set value of P3 parameter.
High humidity alarm means, humidity is above the set
value of H2 parameter.

equal or

Ht

Lt

Low humidity alarm Means humidity is above the set
value of H3 parameter.

equal or

HH

LH

Room temperature fail means, Room sensor not connected or
out of range.

PP

Condenser temperature fail means, condenser sensor not
connected or out of range.

C-PP

Evaporator temperature fail means, Evaporator sensor not
connected or out of range.

Humidity fail means, Humidity sensor not connected or out of
value.

SPPR Fault.

E-PP

H-PP

Compressor over load fault.

SPPR

C-OL

Compressor under load fault.

C-UL

Defrost over load fault.

D-OL

Fault Messages :

HP fault.

HP

Auxiliary fault.

LP fault.

LP

AUX

Defrost under load fault.

D-UL

CRC-2052 CRC-2052

10

Sr.
No.

Parameter setting method

Description of parameters and functions.

Parameter

HSET Function :

controller for Humidity.

To set cut out point of the

Use UP/DOWN keys to set desired value.

Example : If this parameter is set to 70
then humidifier will be off at this
humidity .

04

To change EXIT parameter,
press the set key.

H3+1%

H2-1%

70%

Range

Min Max

Fact. Set

01

P2
Parameter

Function : To set allowable high
temperature limit.

To change P2 parameter,

press the set key.

Use UP/DOWN key to set desired value.

Example : Setting this parameter

0

at 30.0 C will not allow the set point to go

0

above 30.0 C also if the temperature

0

reaches 30.0 C, the display will show HT
(High Temperature). The alarm will be
ON. But at power on till the AL delay is
over controller will not generate HT Alarm.

Once set at a particular value, this will
not allow the set point to go above this
value and below P3 setting.

To set other parameter

Press & hold PRG key for
2 seconds

Display will show ‘P2’ and scroll the
description of the parameter.
To go to other parameters ,
use up / down keys.

SP+0.5ºC

50.0ºC 50.0ºC

Range

Min Max

Fact. Set

PRG

(Message on Display)

Min: MINIMUM Max : MAXIMUM
Fact. Set : FACTORY SETTING(DEFAULT)

Sr.
No.

Parameter setting method

Description of parameters and functions.

Parameter

To set other parameter

Press & hold SET key for
2 seconds

Display will show ‘SET’ and scroll the
description of the parameter.

To go to other parameters,
use up / down keys.

09

SP To set the cut-out point of the controller.

Display will change to set value.
The set point value can now be changed
by using the UP/DOWN key. After
desired value, press the SET key & you
will see “-- ” which confirms that the set
point has been stored in memory.

01

To change Set Point parameter,
press the set key.

QFS

P2-0.5ºC

0ºC

Range

Min Max

Fact. Set

QFS To set the quick freeze set point.

Use UP/DOWN keys to set desired value.

If controller is in quick freeze mode then
compressor will cut in/ cut out as per this
set point till the quick freeze duration is
over.

SP : Set Point.

02

To change QFS parameter,
press the set key.

-50.0ºC

SP

-5.0ºC

Range

Min Max

Fact. Set

CSET To set the Condenser set point.

Use UP/DOWN keys to set desired value.

If condenser logic is set to SP then
condenser will switch off at this set point.

03

To change CSET parameter,
press the set key.

0.0ºC

99.9ºC

20.0ºC

Range

Min Max

Fact. Set

CRC-2052 CRC-2052

EXIT

End of set mode

05

HT