Saturn SMG12 User manual

Commercial Refrigerator
Service Manual
GLASS DOOR MERCHANDISER
SMG12
Please read this manual completely before attempting to install or operate this equipment.

TABLE OF CONTENTS
1. FEATURE CHART
1-1. OUTSIDE DRAWING AND MEASUREMENTS FOR SMG12
2. WIRING DIAGRAM
2-1. REFRIGERATOR (1 DOOR): SMG12
3. PARTS DETAILS
3-1. BOTTOM PANEL
3-2. REFRIGERATION COMPARTMENT
3-3. DOOR
3-4. COOLING COMPARTMENT
4. MAIN COMPONENTS
4-1. COMPRESSOR
4-2. COMPRESSOR RELAY
4-3. CONDENSER DRYER
4-4. CAPACITOR
4-5. EVAPORATOR FAN MOTOR
4-6. CONDENSER FAN MOTOR
4-7. EVAPORATOR DEFROST HEATER
4-8. LAMP
4-9. THERMOSTAT
5. ELECTRONIC CONTROLLER INSTRUCTION
5-1. FREEZER CONTROLLER
5-1-1. DIXELL PARAMETER FOR REFRIGERATOR
5-1-2. HOW TO USE THE CONTROLLER
6. REPLACEMENT OF MAIN COMPONENTS
6-1. BOTTOM PANEL PARTS
6-2. REFRIGERATION COMPARTMENT PARTS
6-3. CONDENSING UNIT

1. FEATURE CHART
1-1. OUTSIDE DRAWING OF SMG12
2. WIRING DIAGRAM
2-1. SMG12

3. PARTS DETAILS
3-1. FRONT PANEL
THERMOSTAT
MAIN SWITCH

3-2. REFRIGERATION COMPARTMENT CYCLE ASSEMBLY
CONDENSER FILTER DRIER CONDENSER FAN MOTOR WATER PAN COMPRESSOR

DRAIN PAN
CONDENSER FAN MOTOR ASSEMBLY
FAN COVER CONDENSER FAN MOTOR BLADE CONDENSER FAN MOTOR

3-3. DOOR
GASKET
Magnetic gasket can be replaced without any tools.

3-4. COOLING COMPARTMENT
CIRCLE FAN COVER
Circle Fan Cover
CIRCLE FAN
Evaporator Fan Motor Blade Evaporator Fan Motor Fan Cover

Evaporator Defrost Heating Element
Evaporator Fan Fan Support

4. MAIN COMPONENTS
4-1. COMPRESSOR
MODEL
SMG12
Refrigerant
R-134a
Voltage
115V/60Hz
Comp.
Model
NE2121Z
Part code
27R.33
4-2. COMPRESSOR RELAY
SMG12
Voltage
115V / 60Hz
Relay
Model
HLC-1XT04XA
4-3. CONDENSER DRYER
MODEL
SMG12
Refrigerant
R-134a
Spec.
XH-9 25g
Part code
GN1410TN.14
4-4. CAPACITOR
MODEL
SMG12
Voltage
115V / 60Hz
Running
---
Starting
160μf
4-5. EVAPORATOR FAN MOTOR
MODEL
SMG12
Voltage
115V / 60Hz
Motor
Model
CA27-04/C20
Part code
27R.30

4-6. CONDENSER FAN MOTOR
MODEL
SMG12
Voltage
115V / 60Hz
Motor
Model
CA27-04/C19
Part code
27F.11
4-7. EVAPORATOR DEFROST HEATER
MODEL
SMG12
Voltage
115V / 60Hz
Spec.
---
Part code
---
4-8. LAMP
MODEL
SMG12
Voltage
115V/60Hz
Spec.
T8 28W
Part code
HGD-12R.21
4-9. MAIN PCB
MODEL
SMG12
Voltage
115V / 60Hz
Model
XR20C
Part code
27R.10

5. ELECTRONIC CONTROLLER INSTRUCTION
5-1-1.
DIXELL XR20C PARAMETER FOR REFRIGERATOR
NO.1
SMG12
NO.
Label
Name
Range
Hidde
n
Par.
Defau
lt
℃/℉
℃
℉
1
Set
Set point
LS-US
-5/23
0
32
2
Hy
Differential
0.1-25.5℃/1-
255℉
2/35.6
2.5
5
3
Ls
Minimum set point
-50℃-SET/-
58℉-SET
Yes
-50/-
58
-2
28
4
Us
Maximum set point
SET-
110℃/SET-
230℉
Yes
110/23
0
10
50
5
Ot
Thermostat probe
calibration
-12-12℃/-120-
120℉
0/32
1
-1
6
P2P
Evaporator probe
presence
n=not
pres. ;y=pres
.
Y
Y
Y
7
OE
Evaporator probe
calibration
-12-12℃/-120-
120℉
Yes
0/32
0
0
8
Ods
Outputs delay at start up
0-255min
Yes
0
2
2
9
AC
Anti-short cycle delay
0-50min
1
2
2
10
CCt
Continuous cycle
duration
0.0-24.0h
Yes
0.0
0.0
0.0
11
COn
Compressor ON time with
faulty probe
0-255min
Yes
15
10
10
12
COF
Compressor OFF time
with faulty probe
0-255min
Yes
30
10
10
13
CF
Temperature
measurement unit
℃/℉
Yes
℃/℉
℃
℉
14
rES
Resolution
in=integer;
dE =
dec .point
DE
DE
DE
15
Lod
Probe displayed
P1;P2
Yes
P1
P1
P1
16
EdF
Defrost termination
setting
Pb=by
temper.;nP=b
y time
Pb
Pb
Pb
17
dtE
Defrost termination
temperature
-50-50℃/-58-
122℉
8/46.4
7
41
18
IdF
Interval between defrost
1-120ore
6
6
6

cycles
19
MdF
(Maximum) length for
defrost
0-255min
30
20
20
21
DFd
Display during defrost
rt, it, Set, DEF
Yes
Set
Set
set
22
dAd
MAX display delay after
defrost
0-255min
Yes
30
30
30
25
dAF
Defrost delay after fast
freezing
0-23h n
50’
Yes
0.0
0
0
30
Alc
Temperature Alarm
configuration
rE=related to
set;Ab=absol
ute
Yes
Ab
re
re
31
ALU
MAX. temperature alarm
SET-
110℃/SET-
230℉
110/23
0
50
90
32
ALL
MIN. temperature alarm
-50℃-SET/-
58℉-SET
-50/-
58
-40
80
33
Ald
Temperature alarm delay
0-255min
Yes
15
0
0
34
dAO
Delay of temperature
alarm at start up
0-23h n 50’
Yes
1.30
1
1
35
i1P
Digital input polarity
oP=opening ;
CL=closing
CL
CL
CL
36
i1F
Digital input configuration
EAL=extern.
alarm ;bAL=l
ock
regulation;P
AL=press.
switch; dor=
doorswitch;
dEF=defrost;
LHt
=disabled;
Htr=Cooling-
heating
dor
dor
dor
37
did
Digital input alarm delay
0-255min
15
15
15
38
Nps
Number of activation of
pressure
0-15
Yes
15
15
15
39
odc
Compressor status with
open door
no,Fan=norm
al;CPr=comp
.OFF;F-
C=Compr.OF
F & fan.OFF
Yes
no
no
no
40
Pbc
Kind of probe
Ptc;ntc
ntc/Pt
c
ntc
ntc
41
dp1
Room probe display
-
Yes
P1
P1
P1

42
dp2
Evaporator probe display
-
Yes
P2
P2
P2
43
rEL
Software release
-
Yes
4.2
4.2
4.2
44
Ptb
Map code
-
Yes
83
83
83
5-1-2.
1. FRONTPANELCOMMANDS
To displaytarget set point, select a parameter or confirm an operation in programming
mode.
To start a manual defrost
To view the last alarm occurrence. In programming mode, it browses the parameter
codes or increases the display value
To view the last alarm occurrence. In programming mode, it browses the parameter
codes or decreases the display value
KEY COMBINATION
To lock & unlock the keyboard
To enter in programming mode
To return to the room temperature display
1.1 Function of LEDS

2. MAINFUNCTIONS
2.1 HOW TO VIEW THE SET POINT
1. Push and immediately release the SET key: the display will show the set point value.
2. Push and immediately release the SET key or wait for 5 seconds to display the
sensor value again.
2.2 HOW TO CHANGE THE SET POINT
1. Push the SET key for more than 2 seconds to change the set point value.
2. The value of the set point will be displayed and the LED starts blinking.
3. To change the set value, push the or key within 10s.
4. To set new point value, push the SET key again or wait 10s.
2.3 HOW TO START A MANUAL DEFROST
Push the key for more than 2 seconds and a manual defrost will start
2.4 HOW TO LOCK THE KEYBOARD
1. Hold the and keys for more than 3s.
2. The “POF”message will be displayed and the keyboard will be locked. At this point, it will be
possible only to see the set point or the MAX or Min temperature stored.
3. If a key is pressed more than 3s the ”POF”message will be displayed.
2.5 HOW TO UNLOCK THE KEYBOARD
Hold the and keys together for more than 3s, until the “POF” message is displayed.
3. ALARMSIGNALS
HOW TO VIEW THE ALARM AND
RESET THE RECORDED ALARM
1. Hold the or key to
display the alarm signals.
2. When the signal is displayed, hold
the SET key until the “rst”message
is displayed. Push the SET key
again. The “rst”message will start
blinking and the normal temperature
will be displayed again.

6. REPLACEMENT OF MAIN COMPONENTS
6-1. FRONT PANEL PARTS
6-1-1. UNSCREW THE FRONT PANEL.
6-1-2. TAKE OFF THE FRONT PANEL
6-1-3. UNSCREW THE JUNCTION BOX. THE MAIN SWITCH, LIGHT SWITCH AND
THERMOSTAT CAN BE CHANGED.

6-2. REFRIGERATION COMPARTMENT PARTS
6-2-1. UNSCREW THE SENSOR CLIP .TAKE THE SENSOR OUT FROM THE CLIP.
6-2-2. Unscrew the circle fan cover.
6-2-3. PULL DOWN THE CIRCLE FAN COVER.

6-2-4. UNSCREW THE FAN SUPPORT
6-2-5. CHANGE THE DEFROST HEATING ELEMENT.
A. UNHOOK THE EVAPORATOR FROM ITS CASING.

B. TAKE OFF THE ELEMENT AND CHANGE IT.
6-3. CONDENSING UNIT
6-3-1. TAKE OFF THE BOTTOM PANEL.

6-3-2. UNSCREW THE UNIT BOARD. YOU CAN PULL THE UNIT BOARD OUT FOR ANY
REPAIR OR CLEANING.
CAUTION:BE CAREFUL OF ELECTRIC SHOCK
CAUTION: MAKE SURE THE POWER SUPPLY IS CUT OFF
BEFORE ANY SERVICE IS PERFORMED.
CAUTION: CONDENSING UNIT MAY BE VERY HOT. BE SURE
IT IS COOL BEFORE ANY SERVICE IS PERFORMED.