Sub-Zero SZ-7524T Operating Instructions

SZ-7524T
Operating Instructions
Touch Sensitive Temperature Controller
Features :
2 NTC probes for cold room temp. + Evap. coil temperature.
0 0
Range : -50.0 C to 50.0 C (when rS = 0.1)
0 0
-50 C to 50 C (when rS = 1)
Relay outputs : Compressor + Defrost + Evap. Fan.
Compressor protection algoriithm.
Auto/Man defrosting facility (Time/Temp based).
CAUTION
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. The terminals admit wires of
upto 2.5sq mm.
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.
Notice: 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.
Installation : Fixing and dimensions of panel models:
To fix the unit, slide the fastener 1 through the guides 2 as per the
position shown in the figure. Move the fastener in the direction of the
arrow, pressing tab 3 it permits to move the fastener in the opposite
direction of the arrow.
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.
Panel Cutout and Dimensions :
MAX
2 10mm
1 3
71 mm
29mm
(Not required if Front
Loading screws used.)
Side Lock
PANEL
GASKET
CONTROLLER
Screw
(Not required if side locks used.)
Front Loading Bezel
Suggested Wiring
230VAC
DEFROST FAN COMP
50-60Hz
C NO NO NC NO
1 2 3 4 5 6 7 8 9 10
TO SZ-N75T
" " *
COMMON for AUX, DOOR,
COIL, ROOM
P
N
Caution:Wiring for 230Vac load only
TECHNICAL DATA
Housing : Black ABS Plastic, Auto-extinguish
Front Cover : Polycarbonate Plastic V0 Grade
Dimensions : Frontal : 94 X 35.3 mm, Depth : 71mm
Panel Cutout : 29 X 71mm
Mounting : Flush panel mounting with fasteners
Protection : IP65 Front (with gasket)
Connections : Screw terminal blocks.
< 2.5sq mm terminal only.
Display : 3 X 17mm 7 segment display &
9 LEDs for Indication
Data storage : Non-volatile EEPROM memory
Power input : 230 Vac ±15 % , 50-60Hz Standard.
Others on request.
Relay output : All relay 8(3)A,250VAC
Operating temp. : 0°C to 60°C (non-condensing)
Operating humidity : 20% to 85% (non-condensing)
Storage temp : -25°C to 60°C (non-condensing)
O O
Measuring Range : -50.0 C to 50.0 C (when rS = 0.1)
O O
-50 C to 50 C (rS = 1)
Input : 2 NTC probe, SZ-N75T (Rubber Type Sensor)
Resolution : +/- 1°C / 0.1°C
Accuracy : +/- 1°C
USER INTERFACE
TM
In Program mode:
UP /
Scroll through parameters & Increases
Coil
parameter value.
To view coil temperature.
Also used to check LL & LH log.
Touch and hold for 2sec to enter into program
Down/
Program mode.
In program mode : Decreases parameter value
This key will mute the visual alarm.
Defrost /
Reset
This key will start a manual defrost cycle if
pressed for 2 sec. Press again for 2 seconds it
will come out of defrost mode and STOP defrost
cycle.
If P7 parameter is set to 0, or Coil temp. is
greater than defrost stop temp. this key will
remain inactive.
In program mode: set/save the changed value
Set
of parameter.
If "nd" parameter is set to
+ + keys pressed simultaneously, display
will show Room Temperature.
INDEX
Sr.
Description
Para.
No.
Compressor relay set point.
1 Set Point
2 Set other parameter.
3 High temperature limit.
P2
Low temperature limit.
4 P3
5 HS Maximum Set Point limit.
6
LS Minimum Set Point limit.
Differential for compressor relay ON condition.
7 P4
8 P5 Probe calibration for room.
9 Time delay (compressor relay restart after cutoff).
P6
Minimum ON time for compressor relay.
10 Ot
11 E1 Compressor relay status in probe fail.
12 Compressor relay OFF time during probe fault.
Cn
Compressor relay ON time during probe fault.
13 Cy
Set type of defrost
14 E2
15 Set drip time for defrost water to drain out.
E3
16 E4 Set post drip time.
Defrost duration during coil probe fail.
17 E5
Computation method for defrost.
18 E6
19 P7 Defrost duration & manual defrost.
Defrost frequency.
20 P8
Power ON defrost delay.
21 P9
Evap. fan stop temp Coil.
22 L1
23 L2
To set time delay between Evap. fan relay
restart time
Evap. Fan operation when compressor is OFF.
24 L3
25 Evap. Fan differential (Hysteresis).
L4
Probe 2 offset calibration (Evap. fan coil probe)
26 L5
35.3mm
Evap. fan status during defrost.
27 L6
28 Defrost stop temperature (Evap Coil probe).
L7
Activate or deactivate door open digital input.
29 do0
30 do1 Door Open fault Sensing delay.
Compressor / Fan Status on Door Open Fault.
31 do2
32 Delay time for Temperature updating at door
do3
open digital input fault.
33 CF0 Activate or deactivate Compressor Fault digital
input.
Compressor Fault digital input Sensing delay.
34 CF1
Compressor / Fan Status on Compressor Fault
35 CF2
digital input.
Set reset mode for Compressor output, on
36 CF3
Compressor Fault digital input.
No of retrials of compressor when Manual
37 CF4
reset is selected.
Display during defrost.
38 ddF
Default (Normal) Display.
39 nd
Delay the display of temperature.
40 dd
41 Ad Time delay at Power ON for alarm indication.
To set controller Resolution
42 rS
Change Password
43 PA
44 Keypad Lock
LP
Restore factory defaults
45 FS
End Programming
46 EP
47 LED Indications
11 12
48 Operating Messages
Password Function
Temperature Logging
User Selectable Default Values
Parameter List :
1
Function: To set compressor relay set point.
Set point
SET
key for 2 seconds.
Touch & hold
Display will show set value. The set point value can now be
modified by using the UP/DOWN key. After selecting the desired
value, touch the set key and user can see "- - -" which confirms
that the set point has been stored in memory.
rS = 0.1
Min Max Fac.
O
LS+1.0 HS-1.0 0.0 C
2
To set other Display will flash "P2".
Parameters. To select other parameters, use UP/DOWN
keys.
Touch & hold
key for
2 seconds.
3 P2 Parameter Function: To set maximum allowable high
temperature limit.
Example: If this parameter is set to 50.0 C and the temperature
O
reaches or goes above 50.0 C, display will show Ht (High Temp.)
indicating that the temperature has reached or gone above the
value set in this parameter.
rS = 0.1
Min Max Fac.
(Message on
P3+1.0 O O
50.0 C 50.0 C
display)
4 P3 Parameter Function: To set minimum allowable low
temperature limit.
Example: If this parameter is set to -50.0 C and the temperature
reaches or goes below -50.0 C, display will show Lt (Low temp)
indicating that the temperature has reached or gone below the
value set in this parameter.
Min
(Message on
O
-50.0 C P2-1.0
display)
5 HS Parameter Function: To set Maximum set point limit.
Once set at a particular value, this will not allow the set point to go
above this value.
Example: Setting this parameter at 50.0°C will not allow the set
point to go above 49.0°C (HS-1.0).
Min
SP+1.0
SP = Set Point
6 LS Parameter Function: To set Minimum set point limit.
or and
Once set at a particular value, this will not allow the set point to go
below this value.
Example: Setting this parameter at -50.0°C will not allow the set
point to go below -49.0°C (LS+1.0).
Min
-50.0 C SP-1.0 O
SP = Set Point
7 P4 Parameter
Function: To set the differential for
compressor relay ON condition.
Differential between cut out and cut in temperature can be set
O O
between 1.0 C to 20.0 C.
Example: If the set point is set at 10.0 C and differential (P4) is
O
set at 2.0 C, then when the room temp reaches 10.0 C, the
compressor relay will cut out. Since the differential is 2.0, the
compressor relay will cut in (restart) at 12.0 C (10.0 C+2.0 C).
Min
O
1.0 C
8
P5 Parameter
Function: To set room probe calibration.
In time it may be possible that the display may be offset by a
degree or so.
To compensate for this error, user may need to add or minus the
degrees required to achieve the correct temperature.
Example : The room temperature on the display is 28.0 C,
whereas the actual room temperature is 30.0 C. User will have to
set the P5 parameter to 2.0, which means that once out of the
programming mode, the room temperature on display will be
O O O
30.0 C (28.0 C+ 2.0 C).
Min
-10.0 C O
9
P6 Parameter
Function: To set time delay between
compressor relay restart.
This parameter is used to protect the compressor from restarting
in a short period of time.
Example: If this parameter is set at 3 minutes, the compressor
relay goes OFF at the set point, it 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 compressor.
10
Ot Parameter
Function: Minimum ON Time For
Compressor relay.
This parameter is used to protect the compressor so that there is
enough time for oil to return back to the compressor. This delay
starts once the compressor relay is ON.
Example: If this parameter is set at 1Min and if the temperature
is achieved before 1 minute, then the compressor relay will
remain ON for minimum 1 minute, though set point is achieved.
11
E1 Parameter
Function : Compressor relay status in case
of Control Probe Failure.
When set to
= Compressor relay status is OFF.
= Compressor relay status is ON.
= Compressor relay performs a duty cycle for Cn for
minutes OFF and Cy for minutes ON.
12
Cn Parameter Function : Compressor relay OFF Time
during Control probe fault.
(This will be considered only when E1 is selected
Example : If this parameter is set to 4 minutes, then compressor
relay will be OFF for 4 minutes while performing the duty cycle.
13
Cy Parameter Function : Compressor relay ON Time during
Control probe fault.
(This will be considered only when E1 is selected
Example : If this parameter is set to 10 minutes, then
compressor relay will be ON for 10 minutes while performing the
duty cycle.
rS = 1
Min Max Fac.
14
E2 Parameter
Function : To set type of defrost.
O
LS+1 HS-1 0 C
= Electric defrost in which case compressor is OFF.
= Hot gas defrost where compressor is ON.
15
E3 Parameter Function : To set drip time for defrost water
to drain out.
This is the time for which the fan, compressor, heater will stay
OFF so that the defrost water can drip & drain out.
O
16
E4 Parameter Function : To set post drip time .
Example : This is the time where compressor goes ON after drip
rS = 1
time.
Min Max Fac.
Note :In electric defrost compressor will ON only if Room temp >
SP + diff. but it will not check this in hot gas defrost.
P3+1 O O
50 C 50 C
17
E5 Parameter
Example: If this is set to 5 min, then manual defrost for 5 min
O
will take place during Coil probe fail.
O
rS = 0.1 rS = 1
18
E6 Parameter
Max Fac. Min Max Fac.
O O O
-50.0 C -50 C P2-1 -50 C
: Defrost Frequency time calculation will start once the
Controller is ON.
Example: If this parameter is set to 6Hrs, then defrost will
happened at every 6Hrs.
: Defrost Frequency time calculation will be done only
When Compressor is ON.
rS = 0.1 rS = 1
Example : If this parameter is set to 6Hrs, then after every
Max Fac. Min Max Fac.
6Hrs of Comp. ON defrost will happen.
O O O O
50.0 C 50.0 C SP+1 50 C 50 C
19
P7 Parameter
This is maximum amount of time allowed for defrost. If set to
0, there will be no defrost cycle.
rS = 0.1 rS = 1
Example : If P7 is set to 15 Mins, E6 is set to rEt and P8 is
Max Fac. Min Max Fac.
set to 1 Hr then after every 1 Hr defrosting will take place for
O O SP-1 O
-50.0 C -50 C -50 C
15 mins.
20
20
P8 Parameter
O
O
This is the amount of time between two defrost cycles.
Example : Same as P7 parameter.
O O O
rS = 0.1 rS = 1
Max Fac. Min Max Fac.
21 P9 Parameter
O O O O O
20.0 C 2.0 C 1 C 20 C 2 C
Example : If P9 parameter is 30 minutes then at power after 30
minutes defrosting will take place once.
22 L1 Parameter
O
O
This setting is used to limit the max temperature beyond which
the Evaporator fan will cut OFF.
Example : If this parameter is set to 2.0ºC, then Evap. Fan
will cut OFF at 2.0ºC.
rS = 0.1 rS = 1
Max Fac. Min Max Fac.
10.0 C O 0.0 C O -10 C O 10 C O 0 C O
23
L2 Parameter
Example : If this parameter sets at 3 minutes, the Evap. Fan
relay will cutoff at the temp. set by L1 parameter but the fan will
not come ON for a minimum of 3 minutes even if L4 is achieved
earlier.
Min Max Fac.
Flashing
24
L3 Parameter
0 Min 99 Min 3 Min
Time delay in progress
= Evaporator fan is OFF when compressor is OFF, and
it will be ON depending on Coil Temperature and its
= Evaporator Fan
Compressor Status according to Coil probe
temperature.
Min Max Fac.
25 L4 Parameter
0 Min 20 Min 0 Min
Example: If L1 parameter is set to 2.0 C, and the L4 is set to
0
2.0 C, then Evap. fan will cut OFF at 2.0 C and restart only at
0
0.0 C
26
L5 Parameter
Min Max Fac.
In time it may be possible that the temp. on 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 -10.0 C to 10.0 C
) .
Min Max Fac.
27
1 Min 99 Min 4 Min L6 Parameter
= In Manual or Auto Defrost ( Hot gas or Heater ), Fan
) .
= In Manual or Auto Defrost ( Hot gas or Heater ) , Fan
Min Max Fac.
1 Min 99 Min 10 Min
28
L7 Parameter
This is the maximum temperature allowable at which the
defrost process will stop.
Example : If this parameter is set to 8.0ºC, then if defrosting is
Min Max Fac.
in progress then when temperature reaches 8.0ºC, the defrost
process will stop.
Defrost will stop according to P7 & E5 parameter,
whichever is achieved earlier.
Min Max Fac.
0 Min 99 Min 3 Min
29
do0
Parameter
= Door open digital input is disabled.
= Door open digital input is activated when contact
is open.
= Door open digital input is activated when contact
is closed.
Min Max Fac.
0 Min 99 Min 1 Min
Function: Defrost duration during Coil
probe failure (Only manual).
Min Max Fac.
1 Min 10 Min 5 Min
Function: To set computation method for
defrost.
Min Max Fac.
Function: To set Defrost duration & Manual
Defrost.
Min Max Fac.
0 Min 99 Min 30 Min
Function : To set Defrost frequency.
Min Max Fac.
1 Hr 31 Hrs 6 Hrs
Function : To set power ON defrost delay.
Min Max Fac.
0 Min 99 Min 30 Min
Function: Evap. fan stop temp (Coil).
rS = 0.1 rS = 1
Min Max Fac. Min Max Fac.
O O O O O O
-50.0 C 50.0 C 2.0 C -50 C 50 C 2 C
Function: To set time delay between Evap.
fan relay restart time
Max Fac.
Min
0 Min 20 Min 1 Min
Function: Evap. Fan operation when
compressor is OFF.
set point .
will be ON /OFF independent of
Min Max Fac.
Function: Evap. Fan differential
(hysterisis).
0
0
rS = 0.1 rS = 1
Min Max Fac. Min Max Fac.
O O O O O O
1.0 C 20.0 C 2.0 C 1 C 20 C 2 C
Function: To set probe 2 offset calibration
(Evap. fan coil probe).
0 0
rS = 0.1 rS = 1
Min Max Fac. Min Max Fac.
O O O O O O
-10.0 C 10.0 C 0.0 C -10 C 10 C 0 C
Function: Evaporator Fan status during
defrost.
will be OFF.
will be ON.
Max Fac.
Min
Function : To set Defrost stop temperature
(Evap. coil probe)
rS = 0.1 rS = 1
Min Max Fac. Min Max Fac.
O O O O O O
-50.0 C 50.0 C 8.0 C -50 C 50 C 8 C
Function : To activate or deactivate door
opendigital input function.
Min Max Fac.