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

12
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
P6
Parameter
Use UP/DOWN keys to set desired value.
Example :
This parameter is used to protect the fan
from restarting in a short period of time
and can be set between 0 to 20 minutes.
If this parameter is set at 3
minutes, the compressor will cut off at
the set temperature, but will not restart
for a minimum of 3 minutes, even if the
differential is achieved earlier. This
To change P6
press the set key.
parameter,
05
Function : To set time delay between
relay restart time.
1 Min 20 Min 3 Min
Range
Min Max Fact. Set
P5
Parameter
Use UP/DOWN keys to set desired
value.
Example :
In time it may be possible that the
display may be offset by a degree or so.
To compensate for this error, you may
need to add or minus the degrees
required to achieve the correct
temperature.
The temperature on the
O
display is 28.0 C, whereas the actual
O
temperature is 30.0 C. You will need to
O
set this parameter to 2.0 C, which
means that once out of the programming
parameter, the display will show the
O O O
temperature 30.0 C (28.0 C + 2.0 C).
To change P5
press the set key.
parameter,
04
Function : To set probe calibration.
-10.0ºC 10.0ºC 0.0ºC
Range
Min Max Fact. Set
11
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
02
P3
Parameter
Function : To set allowable low
temperature limit.
Use UP/DOWN key to set desired value.
Example : Setting this parameter at
0
-30.0 C will not allow the set point to go
0
below -30.0 C also if the temperature
0
reaches -30.0 C, the display will show
LT (Low Temperature). The alarm will be
ON.
Once set at a particular value, this will
not allow the set point to go below this
value and above P2 setting.
To change parameter,
press the set key.
P3
-50.0ºC SP-0.5ºC -50.0ºC
Range
Min Max Fact. Set
(Message on Display)
Use UP/DOWN keys to set desired value.
Example(Cooling Mode) : If the set
0
point is set at 10.0 C and differential is
0
set at 2.0 C, then when the system
0
reaches 10.0 C, the comp. relay will
0
cutout. Since the differential is 2.0 C, the
0
comp. Relay will cutin at 12.0 C
0 0
(10.0 C + 2.0 C).
03
P4
Parameter
Function : To set the differential for
compressor restart.
To change P4
press the set key.
parameter,
0.5ºC 20.0ºC 2.0ºC
Range
Min Max Fact. Set
parameter is good to protect the life of
the compressor when there are power
fluctuations and the compressor is
switched off and on within a few seconds.
LT

13
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
P7
Parameter
06
Function : To set duration of defrost.
To change the P7 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
0 Min 99 Min 30 Min
Range
Min Max Fact. Set
This is maximum amount of time allowed
for defrost. If set to 0, there will be no
defrost cycle.
Example : If P7 is set to 15 Mins and
P8 parameter is set to 1 Hr. then after
every 1 Hr defrosting will take place for
15 mins.
P8
Parameter
07
Function : To set defrost frequency.
To change the P8 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
1 Hr 31 Hrs 6 Hr
Range
Min Max Fact. Set
This is the amount of time between two
defrost cycles.
Example : same as P7 parameter.
P9
Parameter
08
Function : To set power on defrost delay.
To change the P9 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
0 Min 99 Min 30 Min
Range
Min Max Fact. Set
This is the amount of time at power on
after which defrosting will take place
once.
Example : If P9 parameter is 30 mins
then at power after 30 mins defrosting
will take place once.
14
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
P10
Parameter
09
Function : To set type of defrost.
To change the P10 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
HTR HTG HTR
Range
Min Max Fact. Set
HTR : Heater defrost where compressor
is OFF.
HTG : Hot Gas defrost where compressor
is ON.
P11
Parameter
10
Function : To set drip time for defrost.
To change the P11 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
0 Min 30 Min 1 Min
Range
Min Max Fact. Set
During this period Compressor,
Evaporator Fan, LSV relay and Heater
will stay off so that the defrost water can
drain out.
P12
Parameter
11
Function : To set type of computation for
defrost time..
To change the P9 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
REAL CRH REAL
Range
Min Max Fact. Set
REAL = Total of real time.
Example : This means that the time
calculation for defrost frequency will be
for the total hours the unit has been
running.
CRH - Sum of total compressor
operating times. This means that for
time calculation, the unit will add the
total time the compressor has been in
an ON mode.
It keeps a record of the hours worked
+/-½ Hour incase of a power failure.
CRC-2052 CRC-2052

15 16
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
Example : If Defrost frequency is set to
6hrs. and 3.45 hrs have passed after
unit has started and power fails, then
defrost cycle will stat after 3½ hours
when power resumes.
P13
Parameter
12
Function : To set defrost stop
temperature
To change the P13 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
-50.0ºC 50.0ºC 4.0ºC
Range
Min Max Fact. Set
If coil/Evap temperature is reached upto
this temperature defrost will stop.
Example : If this parameter is set to
7.0ºC,then if defrosting is in progress then
when temperature reaches 7.0ºC, the
defrost process will stop.
RH
Parameter
13
Function : To enable or disable humidity
sensing.
To change the RH Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
DIS ENB DIS
Range
Min Max Fact. Set
DISABLE : Humidity sensing disable.
ENABLE : Humidity sensing enable.
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
H2
Parameter
14
Function : To set allowable high humidity
limit.
To change the H2 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
Hset+1 100% 100%
Range
Min Max Fact. Set
Once set at a particular value, this will not
allow the set point for Humidity to go
above this value and below H3 Set value.
Example : Setting this parameter at 70%
will not allow the set point of Humidity to
go above 70% .
Also, if the humidity reaches 70% or
above. the display will show HH(High
Humidity) indicating that the humidity has
gone above the value in this parameter
H3
Parameter
15
Function : To set allowable low humidity
limit.
To change the H3 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
0% Hset-1 0%
Range
Min Max Fact. Set
Once set at a particular value, this will not
allow the set point for Humidity to go
below this value and above H2 Set value.
Example : Setting this parameter at 40%
will not allow the set point of Humidity to
go below 40% .
Also, if the humidity reaches 40%. the
display will show LH(Low Humidity)
indicating that the humidity has gone
below the value in this parameter.
H4
Parameter
16
Function : To set differential (Hysterisis)
for humidity.
To change the H4 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
Example : If the set point is set at 60%
and differential is set at 3, then when the
system reaches 60%, the Relay will cut
out. Since the differential is 3, the relay will
cut in (restart) at 63% (60% -3%).
1% 10% 2%
Range
Min Max Fact. Set
(Message on Display)
HH
(Message on Display)
LH
CRC-2052 CRC-2052

17
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
H5
Parameter
17
Function : To set probe calibration for
humidity.
To change the H5 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired
value.
In time it may be possible that the
display for Humidity may be offset by a
% or so. To compensate for this error,
you may need to add or minus the %
required to achieve the correct Humidity.
Example : The Humidity on the display
is 40%, whereas the actual Humidity is
42%. You will need to set the H5
parameter to 2, which means that once
out of the programming mode, the
Humidity will show 42%(40% + 2%).
-10% 10% 0%
Range
Min Max Fact. Set
H6
Parameter
18
Function : To set time delay between
relay restart time for humidity.
To change the H6 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
This parameter is used to protect the
Humidifier from restarting in a short period
of time.
Example : If H6 set at 3 minutes, the
relay for Humidifier will cut off at the set
Humidity, but will not restart for a
minimum of 3 minutes, even if the
differential is achieved earlier. This
parameter is good to protect the life of
the Humidifier or even in applications
where the probe is placed at places
where there are sudden & short changes
in humidity like above a cold room door.
1 Min 20 Min 2 Min
Range
Min Max Fact. Set
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
18
QFD
Parameter
19
Function : To set quick freeze duration.
To change the QFD Parameter,
press the set key.
Use UP/DOWN keys to set desired value.
This is the maximum amount of time
allowed for Quick Freeze. If set to “0”,
there will be no quick freeze.
Example : If QFS is set to -20.0 C, and
quick freeze duration is set to 1 hr ,then
when it is in quick freeze mode, then the
Comp. will work on -20.0C set point for
1hr.
0 Hr 12 Hrs 2 Hr
Range
Min Max Fact. Set
CND3
Parameter
20
Function : To set condenser logic.
To change the CND3
parameter, press the set key.
Use UP/DOWN keys to set desired value.
This function is used to set condenser
logic as per compressor or condenser Set
point
COMP = As per compressor.
SP = As per condenser SP.
If this parameter is set to Compressor
then condenser will switch ON / OFF as
per compressor. But if set to SP then
Condenser will be OFF when condenser
temperature reaches condenser SP.
COMP SP COMP
Range
Min Max Fact. Set
CND4
Parameter
21
Function : To set condenser differential.
To change the CND4
parameter, press the set key.
Use UP/DOWN keys to set desired value.
Example : If this parameter is set to SP
and CSET (Condenser set point ) is 20.0
deg & CND4 to 2.0 deg then at 20.0
degree condenser relay will be off and
restart at (20.0 +2.0) 22.0 deg
0.5ºC 20.0ºC 2.0ºC
Range
Min Max Fact. Set
CRC-2052 CRC-2052

19
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
CND5
Parameter
22
Function : To set condenser probe
calibration.
To change the CND5
parameter, press the set key.
Use UP/DOWN keys to set desired
value.
In time it may be possible that the
display for condenser may be offset by a
deg or so. To compensate for this error,
you may need to add or minus the offset
required to achieve the correct
condenser temperature.
Example : The temperature on the
display is 28.0ºC, whereas the actual
temperature is 30.0ºC. You will need to
set the CND5 parameter to 2.0ºC, which
means that once out of the programming
mode, the temperature will show 30.0ºC
(28.0ºC+ 2.0ºC).
-10.0ºC 10.0ºC 0.0ºC
Range
Min Max Fact. Set
CND6
Parameter
23
Function : To set condenser on delay
timings.
To change the CND6
parameter, press the set key.
Use UP/DOWN keys to set desired value.
When Compressor delay over Condenser
Fan will come ON first, after cond. On
delay over Comp will come ON.
0 Sec 30 Sec 15 Sec
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired value.
This function is used to decide the
condenser status when hot gas defrost is
on. This parameter is not applicable for
Heater defrost.
At hot gas defrost,
OFF : Condenser will be OFF
ON : Condenser will be ON
CND7
Parameter
24
Function : To set condenser status at hot
gas defrost.
To change the CND7
parameter, press the set key.
OFF ON OFF
Range
Min Max Fact. Set
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
20
Use UP/DOWN keys to set desired value.
This setting is used to limit the max.
temperature beyond which the Evap.Fan
will cut off.
Example : If this parameter is set to
2.0ºC, then Evap. Fan will cut off at 2.0ºC.
L1
Parameter
25
Function : To set Evaporator Fan stop
temperature.
To change the L1 parameter,
press the set key.
-50.0ºC 50.0ºC 2.0ºC
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired
value.
Example : If this is set at 3 minutes,
Evap. Fan relay will cut off at the set by
Evap. Fan Stop TC. Parameter but the
Fan will not come on for a minimum of 3
minutes even if it’s differential is
achieved earlier.
L2
Parameter
26
Function : To set Evaporator Restart
Delay.
To change the L2 parameter,
press the set key.
0 Min 20 Min 1 Min
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired value.
OFF : Evaporator Fan will be Off at
compressor OFF.
ON : Evaporator Fan will be On at
compressor OFF.
L3
Parameter
27
Function : To set Evaporator Fan status
at compressor off.
To change the L3 parameter,
press the set key.
OFF ON ON
Range
Min Max Fact. Set
CRC-2052 CRC-2052

21
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
L4
Parameter
28
Function : To set Evaporator Fan
differential.
To change the L4 parameter,
press the set key.
Use UP/DOWN keys to set desired
value.
Example : If Evaporator Fan Stop Tc
parameteris set to 2.0ºC, and if EVAP
DIFFERENTIAL parameter is set to
2.0ºC,then Evap. Fan will cut off at 2.0ºC
and restart only at 0.0ºC.
(2.0ºC-2.0ºC = 0.0ºC).
0.5ºC 20.0ºC 2.0ºC
Range
Min Max Fact. Set
L5
Parameter
29
Function : To set Evaporator probe
calibration.
To change the L5 parameter,
press the set key.
Use UP/DOWN keys to set desired value.
In time it may be possible that the display
may be offset by a degree or so. To
compensate for this error, you may need
to add or minus the degrees required to
achieve the correct temperature. Setting
value is from -10ºC to + 10ºC.
-10.0ºC 10.0ºC 0.0ºC
Range
Min Max Fact. Set
L7
Parameter
30
Function : To set Compressor-
Evaporator Fan status at Door open
condition.
To change the L7 parameter,
press the set key.
Use UP/DOWN keys to set desired value.
At Door Open,
NORM : Normal.
FAN : Evaporator Fan Off.
COMP : Compressor Off.
F-C : Compressor and Evaporator Fan
Off.
NORM F-C NORM
Range
Min Max Fact. Set
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
L8
Parameter
31
Function : EvaporatorTo set Fan status
during defrost.
To change the L8 Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
OFF ON OFF
Range
Min Max Fact. Set
OFF : Fan Off during
defrost.
ON : Fan On during
defrost.
Evaporator
Evaporator
22
BUZ
Parameter
32
Function : To enable / disable buzzer.
To change the BUZ Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
DIS ENB ENB
Range
Min Max Fact. Set
Example:
ENB : Buzzer enabled.
DIS : Buzzer disabled.
AL
Parameter
33
Function : This parameter is used to set
power on delay for alarm.
To change the AL Parameter
parameter, press the set key.
Use UP/DOWN keys to set desired value.
0 Min 99 Min 30 Min
Range
Min Max Fact. Set
Example : If you set this parameter to
20, once the power is switched on, the
alarm will not activate for 20 minutes
after the power is switched on. This
is most useful to avoid the nuisance
alarms when the ambients are high
when the machine is switched on after
a long time.
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23
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
C-UL
Parameter
34
Function : Under load limit for
compressor current.
To change the C-UL parameter,
press the set key.
Use UP/DOWN keys to set desired
value.
Example : If C-UL= 1.0A and
compressor current is less than 1.0A
then and exists till C2 current sensing
delay then it is registered as UL fault.
Compressor will get OFF on this fault. If
after 3 retries within 1 Hour current
drawn is still less than 1.0Amp the
controller will trip the compressor on
fault and activate respective alarm relay.
Also display will flash ‘C-UL’. Controller
will go in manual reset mode.
0.0A (C-OL
-1.0)A
1.0A
Range
Min Max Fact. Set
C-OL
Parameter
35
Function : Over load limit for compressor
current.
To change the C-OL parameter,
press the set key.
Use UP/DOWN keys to set desired value.
Example : If C-OL= 10 A and compressor
current is greater than 10 A then and exist
till C2 current sensing delay then C-OL
fault exists and flash on display.
Compressor will be tripped on this fault.
(C-UL
+1.0) A
18.0A 10.0A
Range
Min Max Fact. Set
24
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
D-UL
Parameter
36
Function : Under load limit for Heater /
Solenoid.
To change the D-UL parameter,
press the set key.
0.0A (D-OL
-1.0) A
1.0A
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired value.
Example : If C2 = 5 sec then, any
current fault will be valid only when it
exists for more than 5 sec.
To change the C2 parameter,
press the set key.
C2
Parameter
38
Function : Current sensing delay.
5 Sec 60 Sec 5 Sec
Range
Min Max Fact. Set
D-OL
Parameter
37
Function : Over load limit for
Heater/Solenoid.
To change the D-OL parameter,
press the set key.
Use UP/DOWN keys to set desired
value.
Example : If D-OL= 10 A and Heater /
Solenoid current is greater than 10 A
then and exist till C2 current sensing
delay then D-OL fault exists and flash on
display. Heater / Solenoid will be tripped
on this fault.
(D-UL
+1.0) A
18.0A 10.0A
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired value.
If this parameter is set to
Setting this parameter to disable will
ignore HP fault for compressor. If this
parameter is set to Enable then controller
will detect HP trip.
Example :
ENB : HP sensing is enabled.
DIS : HP sensing is disabled
To change the D0 parameter,
press the set key.
D0
Parameter
39
Function : To enable or Disable HP
sensing.
DIS ENB ENB
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired
value.
Example : If D-UL= 1.0A and Heater /
Solenoid current is less than 1.0A then
and exists till C2 current sensing delay
then it is registered as UL fault. Heater /
Solenoid will get OFF on this fault. If
after 3 retries within 1 Hour current
drawn is still less than 1.0Amp the
controller will trip the Heater/Solenoid on
fault and activate respective alarm relay.
Also display will flash ‘D-UL’. Controller
will go in manual reset mode.
CRC-2052 CRC-2052

Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
26
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
25
Use UP/DOWN keys to set desired
value.
Setting this parameter to disable will
ignore LP fault for compressor. If this
parameter is set to Enable then controller
will detect LP trip.
Example:
If this parameter is set to
ENB : LP sensing is enabled.
DIS : LP sensing is disabled.
To change D1
parameter, press the set key.
DIS ENB
D1
Parameter
40
ENB
Function : To enable or disable LP
sensing.
Range
Min Max Fact. Set
D2
Parameter
41
To change D2 parameter,
press the set key.
0V 230V
Function : Fault sensing logic.
230V
Use UP/DOWN keys to set desired
value.
0v : 0V at HP/LP/AUX input will be
sensed as fault and trip the
compressor.
230V : 230V at HP/LP/AUX input will be
sensed as fault and trip the
compressor.
Range
Min Max Fact. Set
To change D3 parameter,
press the set key.
0 Sec
42
MinMin
Use UP/DOWN keys to set desired value.
Example : If this parameter is set to 5
sec,then LP fault will be sensed only
when it present continuously for 5 Secs.
180 Sec 30 Sec
D3
Parameter
Function : To set LP sensing delay.
Range
Max Fact. Set
Range
Max Fact. Set
To change D4 parameter,
press the set key.
D4
Parameter
43
Function : To set reset mode for HP fault.
MAN AUTO AUTO
Range
Min Max Fact. Set
Range
Min Max Fact. Set
Use UP/DOWN keys to set desired
value.
MAN : Manual Mode.
AUTO : Auto mode.
If this parameter set to “MAN” mode HP
fault will be cleared only after pressing
reset key for 2 seconds.
If this parameter is set to “AUTO” mode
HP fault will be cleared automatically
when it is healthy.
To change E1 parameter,
press the set key.
E1
Parameter
44
Range
Min Max Fact. Set
Range
Min Max Fact. Set
When set to
ON : Relay will stay ON.
CYC : Relay performs a duty cycle of
as per TON & TOFF .
OFF : Relay will stay OFF.
ON OFF CYC
Function : To set Compressor Relay
status on Probe Failure.
Use UP/DOWN keys to set desired
value.
To change TON parameter,
press the set key.
TON
Parameter
45
Range
Min Max Fact. Set
Range
Min Max Fact. Set
At room probe fail condition when E1
parameter is selected as 'CYC' then the
on cycle is specified by Ton parameter.
1 Min 30 Min 10 Min
Function : To set On cycle at room
probe fail.
Use UP/DOWN keys to set desired
value.
CRC-2052 CRC-2052

27 28
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
To change TON parameter,
press the set key.
TOFF
Parameter
46
Range
Min Max Fact. Set
Range
Min Max Fact. Set
At room probe fail condition when E1
parameter is selected as 'CYC' then the
Off cycle is specified by Ton parameter.
1 Min 30 Min 4 Min
Function : To set Off cycle at room probe
fail.
Use UP/DOWN keys to set desired
value.
To change PDN parameter,
press the set key.
PDN
Parameter
49
Range
Min Max Fact. Set
Range
Min Max Fact. Set
DIS : SV relay will not activate.
ENB : SV relay will get activated and
will cut out and cut-in according
to set temperature.
DIS ENB DIS
Function : To activate Solenoid Valve
relay.
Use UP/DOWN keys to set desired
value.
E7
Parameter
Use UP/DOWN keys to set desired
value.
TEMP : At defrosting temperature
will be dispalyed.
DEFR : At Defrosting 'Defrost ON'
will scroll.
47
Function : To set Display at defrosting.
To change E7 parameter,
press the SET key.
TEMP DEFR TEMP
Range
Min Max Fact. Set
Range
Min Max Fact. Set
Example : If this parameter is set to 7
mins then, when light is switched on after
7 mins it will be switch off automatically.
LD
Parameter
Use UP/DOWN keys to set desired
value.
This parameter is used set the time
delay to automatically switch off the light.
If LD is set to 0 then this parameter is
disabled.
48
Function : To set time delay to switch off
the light .
To change LD parameter,
press the SET key.
0 Min 30 Min 7 Min
Range
Min Max Fact. Set
Range
Min Max Fact. Set
09999 0
To change the PW parameter,
press the set key.
PW
Parameter
50
Function : To change password.
Use UP/DOWN key to change the
password.
User can enter into program mode
only if correct password is entered. If the
password is wrong it will show ‘INVALID
PASSWORD’.
Range
Min Max Fact. Set
Range
Min Max Fact. Set
E8
Parameter
Use UP/DOWN keys to set desired
value.
Example: If this is set to 10 min,
then manual defrost for 10 min
will take place during Coil probe fail.
47
Function : Defrost duration during Coil
probe failure.
To change E8 parameter,
press the SET key.
1 Min 10 Min 5 Min
Range
Min Max Fact. Set
Range
Min Max Fact. Set
CRC-2052 CRC-2052

29 30
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
ID
Parameter
This parameter is used to set the Unit ID
of the device.
53
Function : To set Unit ID.
To change Unit ID
parameter, press the SET key.
1 240 1
Range
Min Max Fact. Set
Range
Min Max Fact. Set
CRH
Parameter
51
Function : To view Compressor run
Hours.
It will display compressor run hours. It's
a read only parameter.
NO YES NO
CCRH
52
Function : Clear Compressor Run
Hours.
If this parameter is set to ‘YES’
compressor run hours (CRH) are
cleared.
Range
Min Max Fact. Set
Range
Min Max Fact. Set
LP
54
To change Keypad Lock
parameter, press the set key.
NO YES NO
Function: To activate Keypad Lock.
This parameter can lock the keypad so
that tempering is not possible by by-
standers.
NO : deactivates keypad lock.
YES : activates keypad lock.
On activation, all the parameters can only
be viewed, but not modified.
If the keypad is locked “LOCK” message
will be displayed..
Range
Min Max Fact. Set
Range
Min Max Fact. Set
DIS ENB DIS
To change PO parameter,
press the SET key.
PO
Parameter
Function : To enable/disable Power
Switch.
Use UP/DOWN keys to get desired
value & press SET key to confirm.
DIS : Disable power switch
ENB : Enables power switch
Controller has power switch, which
if enable puts controller in active or
stand by state.
If press for 2 seconds controller will
go in stand by mode, display will
be as per “PDIS” parameter.
To again switch to ACTIVE WORKING
MODE, press power switch again for 2
seconds. All leds and display will flash
and enter into NORMAL WORKING
MODE.
23
55
Range
Min Max Fact. Set
Range
Min Max Fact. Set
LED TEMP LED
To change PDIS parameter,
press the SET key.
PDIS
Parameter
Function : To set display at power OFF
mode.
Use UP/DOWN keys to set desired value.
At power OFF mode power OFF LED
will glow & display will be as below,
LED : Display Will be Blank.
OFF : Display will show OFF.
TEMP : Display will show Temperature.
23
56
Range
Min Max Fact. Set
Range
Min Max Fact. Set
CRC-2052 CRC-2052

31
Sr.
No.
Parameter setting method
Description of parameters and functions.
Parameter
EP
Parameter
Once the set key is pressed, the
controller goes into the normal mode
and displays the Room Temperature and
all settings are recorded.
58
Function: To exit programming.
To exit programming
parameter, press the SET key.
NO YES NO
To change FS parameter,
press the SET key.
FS
Parameter
Function : To restore default settings of
the controller.
Use UP/DOWN keys to set desired value.
When set to YES all parameters
are programmed to factory
values.
Useful to debug setting related
problems.
23
57
Range
Min Max Fact. Set
Range
Min Max Fact. Set
Technical Data
32
Housing : ABS Plastic.
Dimensions : 400 x 300 x 135 mm
Mounting : Wall mounting.
Connection : Spring clamp terminal block.
4 sq. mm wire.
Display : 4 Digit, 1” Dot matrix Display and 14 LEDs for
indication.
Data Storage : Non-Volatile EEPROM Memory.
Power Input (Options) : 415Vac +/-10%, 50-60Hz.
3Phase Supply with Neutral
0 0
Operating Temp : 5 C to 50 C(non-condensing).
0 0
Storage temp : -20 C to 70 C(non-condensing).
Output :
Contactors Comp & Def. : 18A.
Contactor Evap. : 9A.
Condenser Relay : 10A/250Vac.
Light Relay : 10A/250Vac.
Alarm Relay : 5A/250Vac.
Humidifier Relay : 10A/250Vac.
Sensors :
1) Temperature sensor:
0
Resolution : 0.1 C.
0
Accuracy : +/-1 C.
0 0
Probe Tolerance at 25 C : +/-0.3 C.
Room & Evap Temperature :
0 0
Range : -50.0 C to 50.0 C
Condenser Temperature :
0 0
Range : 0.0 C to 99.9 C
2) Humidity sensor
Range : 0 to 100%
Resolution : 1%.
Analog I/p:
Compressor current (R,Y,B)
Defrost current(R,Y,B)
Resolution : 0.1Amp.
Accuracy : +/-1 Amp.
Sensor Type : NTC Thermistor.
Sensor Type : 4-20mA out.
CRC-2052 CRC-2052

33
Technical Data
Digital Inputs:
HP, LP, Auxillary, Door, Sppr, R-Ph, Y-Ph, B- Ph.
Buzzer : Internal
RS485 Connectivity : Modbus RTU Protocol
Baud Rate : 9600
Device ID : 1 (By Default)
34
WIRING : The probe and its corresponding wires should never be installed
in a conduit next to control or power supply lines. The electrical wiring
should be done as shown in the diagram. The power supply circuit should
be connected to a protection switch.
WARNING : Improper wiring may cause irreparable damage and personal
injury. Kindly ensure that wiring is done by qualified personnel only.
Maintenance : Cleaning : Clean the surface of the controller with a soft
moist cloth. Do not use abrasive detergents, petrol, alcohol or solvents.
Controller
Controller should be installed in a place protected by vibration, water and
corrosive gasses and where ambient temperature does not exceed the values
specified in the technical data.
Probe
To give a correct reading, the probe must be installed in a place protected from
thermal influences, which may affect the temperature to be controlled.
Caution
CRC-2052 CRC-2052

35
The information in this document is subject to change in order to improve
reliability, design or function without prior notice and does not represent a
commitment on the part of the company. In no event will the company be liable
for direct, indirect, special, incidental or consequential damage arising out of
the use or inability to use the product or documentation, even if advised of the
possibility of such damages. No part of this manual may be reproduced or
transmitted in any form or by any means without the prior written permission of
the company.
Notice
Disclaimer
Warranty
This manual & its contents remain the sole property of A.S.Controls Pvt.Ltd.,
India and shall not be reproduced or distributed without authorization. Although
great care has been taken in the preparations of this document, the company
or its vendors in no event will be liable for direct, indirect, special, incidental or
consequential damage arising out of the use or inability to use the product or
documentation, even if advised of the possibility of such damages. No part of
this manual may be reproduced or transmitted in any form or by any means
without the prior written permission of the company. A.S.Controls Pvt.Ltd.
reserves the right to make and changes or improvements without prior notice.
This product is warranted against defects in materials and workmanship for a
period of one year from the date of purchase. During the warranty period,
product determined by us to be defective in form or function will be repaired or,
at our option, replaced at no charge. This warranty does not apply if the product
has been damaged by accident, abuse, and misuse or as a result of service or
modification other than by the company. This warranty is in lieu of any other
warranty expressed or implied. In no event shall the company be held liable for
incidental or consequential damages, such as lost revenue or lost business
opportunity arising from the purchase of this product.
INDIA
Ball Valves
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OUR OTHER PRODUCTS
Cold Room Controller
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Two Compressors Controller
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TM
00 / 13.03.12
CRC-2052

SUGGESTED CONNECTION DIAGRAM
2 1
54
3
6
R PHASE
LSV
COMP DEF EVAP
COND
2 1
43
LIGHT
ALARM
HUMIDIFIER
PHASE
1
4
76
9 8
10
2
35
LP
AUX
HP SPPR DOORGND
B Phase
1
4
987
6
11 1012
Y Phase
2
35
R PHASE NEUTRAL
1
4
9 8
11 10 12
2
35
Cond Probe Coil Probe Room Probe
76
14 13
RH IN
GND
RS485
+
-
2 1
65
3
7
GND
CT6
CT5
CT4 CT3 CT2 CT1
4
8
A2 A3 A6 A7A5
1 2
A1
A4
OUTPUTS FAULT SIGNALS INPUT SUPPLYSENSOR CT INPUTOUTPUTS
EMERGENCY
STOP