Lang Manufacturing Company 6500 Merrill Creek Parkway Everett, WA 98203
Part Number: 60850-32
Phone: 425-349-2400 Fax: 425-349-2483
Product Manual
Lang "Purple" Computer
Operation
Service
Troubleshooting
Lang Manufacturing Company 6500 Merrill Creek Parkway Everett, WA 98203
Part Number: 60850-32
Phone: 425-349-2400 Fax: 425-349-2483
TABLE OF CONTENTS
CONTROL PANEL..........................................................................................................................1
TABLE OF CONTENTS .................................................................................................................2
CONTROL PANEL..........................................................................................................................3
PROGRAMMING............................................................................................................................2
DEFINITIONS............................................................................................................................2
CONTROL PANEL BUTTONS...................................................................................2
PROGRAMMING TERMS..........................................................................................2
PROGRAMMING............................................................................................................................3
BEFORE YOU BEGIN PROGRAMMING................................................................................3
DISPLAY READOUTS................................................................................................3
PROGRAMMING............................................................................................................................4
PROGRAMMING SEQUENCE.................................................................................................4
PROGRAMMING............................................................................................................................5
PROGRAMMING............................................................................................................................6
OPTIONAL PROGRAMMING CODES....................................................................................6
PROGRAMMING............................................................................................................................7
PROGRAMMING CODES.........................................................................................................7
SERVICE...........................................................................................................................................8
MODEL STRAPPING INSTRUCTIONS...................................................................................8
SERVICE...........................................................................................................................................9
CIRCUIT BOARD IDENTIFICATION .....................................................................................9
TROUBLESHOOTING...................................................................................................................10
TROUBLE SHOOTING..................................................................................................................10
TEMPERATURE SENSOR VALUES .......................................................................................11
SENSOR RESISTANCE...............................................................................................11
SENSOR VOLTAGE DROP ........................................................................................11
TROUBLESHOOTING...................................................................................................................12
OPERATIONAL SEQUENCE....................................................................................................12
GAS CONVECTION OVEN........................................................................................12
TROUBLESHOOTING...................................................................................................................13
ELECTRIC CONVECTION OVEN.............................................................................13
TROUBLESHOOTING...................................................................................................................14
INDEX...............................................................................................................................................15
1
CONTROL PANEL
1. Light Switch
2. Power Switch
3. Display
4. "Tier" Lamps
5. Product Buttons 1 - 0
6. Manual Program Button
7. Shelf Buttons A - E
8. "Read/Clear" Button
9. Temperature Recall
Button
2
PROGRAMMING
DEFINITIONS
CONTROL PANEL BUTTONS
1 -O
Product Buttons. These are the buttons where the product programs are
stored. Pressing a Product Button will heat the oven to the programmed
temperature.
A - E
Shelf Buttons. The control is capable of timing each shelf individually.
Pressing a Product Button then a Shelf Button will start the countdown timer.
MAN PROG
The MANUAL PROGRAM button allows the operator to enter a temporary
product program without being required to input the programming code. The
temporary program is erased when the oven is turned off or when a new
program is entered. Time and temperature are the only parameters that can be
entered in the Manual Program mode.
READ/CLEAR
The READ/CLEAR button has several functions.
•
It is always the first button pressed when entering programming
codes.
•
Pressing it twice then pressing a Product Button will "read-back"
the program in that product button.
•
Pressing and holding the button down until "88888" appears in
the display will cancel the current mode of the control and return
the display to "Enter".
TEMP
When the Temperature Recall Button is pressed, the display will indicate the
internal oven temperature. When released the display will revert to the
previous readout.
PROGRAMMING TERMS
COOKING CURVE
Cooking curve is a function of the computer that controls the cooking time.
If the temperature of the oven is lower than the programmed temperature,
the control will slow the timer down to compensate for the lower cooking
temperature. Cooking Curves from 0 - no time adjustment to 7 - maximum
adjustment are available. Cooking Curve 3 is the most commonly used.
However, as a general rule the longer the cooking time the lower the
cooking curve, the shorter the cooking time the higher the cooking curve.
3
PROGRAMMING
FAN FUNCTION
The convection fan has two programmable options.
Fan On
(Fan 1) runs
the convection fan continuously.
Fan Off
(Fan 0) leaves the fan off until
heat is called for by the control. In a convection oven, the fan must come
On whenever the heat comes On. The convection fan can not be turned Off
continuously.
TIER
"Tiered" programming is the ability to change the
cooking temperature
or
fan function
during the cooking cycle. As an example, some products
require the fan to be Off for the first half of the cooking cycle then turn On
for the last half, Tier 1 would be programmed with the fan in the Off mode
then Tier 2 would be fan On. The Tier lamps located below the display
(labeled T1, T2, T3, T4) will illuminate to indicate which Tier is being
programmed or which Tier the program is in during the cooking cycle.
BEFORE YOU BEGIN PROGRAMMING
The readout must display "ENTER" before the computer will accept any programming.
If the readout displays any other word, turn the oven Off then back On before beginning any programming
sequence.
The Control allows for a 3 second delay between each button push, if a delay of longer than 3 seconds has
occurred, the programming sequence must be re-entered.
Once the programming code is entered, the readout will prompt for the program information. The sample
screens, below, will describe what each prompt means.
DISPLAY READOUTS
MEANING
Enter
Product
Temperature
Cooking Curve 0 through 7
Fan On or Off (fan function)
Time
DISPLAY
EnTer
Prod
000 F
CC0-7
FAn 01
0:00:00
4
PROGRAMMING
PROGRAMMING SEQUENCE
The following procedure describes a standard programming sequence. Each programming prompt is shown
in the coloum DISPLAY and the required program entry is shown in the coloum ACTION.
The Control allows for a 3 second delay between each button push, if a delay of longer than 3 seconds has
occurred, the programming sequence must be re-entered.
ACTION
Press:
Read/Clear, 1, 6, 2, 7, 3, 8
Select a
Product Button
1 through 0
Enter a
Cooking Temperature
, 100 through 450 degrees.
Enter a
Cooking Curve
, 0 through 7. For a definition of Cooking curve, refer to
the
DEFINITIONS
section.
Select a
Fan Function
. 0 = Off, 1 = On. For a definition of Fan Function, refer
to the
DEFINITIONS
section.
Enter a
Cooking Time
, Hours/Minutes/Seconds up to 9:59:59.
This prompt is the beginning of the
Tier 2
portion of the programming. For a
definition of
Tiers
refer to the
DEFINITIONS
section.
If, during the cooking cycle, the program calls for a change in the
Cooking
Temperature
or
Fan Function
that change can be entered at this time.
The Tier being programmed is indicated by the lighted
Tier Lamp
below the
Display.
If Tier 2, Tier 3, or Tier 4 programming is required, repeat the above entries as
prompted by the display (Cooking Curve is entered in Tier 1 only ) until all
necessary Tiers are programmed, then proceed to the steps shown below.
IMPORTANT
If the program requires one Tier programming only
DO NOT
repeat the above
procedures, proceed to the steps shown below.
DISPLAY
EnTer
Prod
000 F
CC0-7
FAn 01
0:00:00
000 F
5
PROGRAMMING
Press the flashing
E
button to "Exit" this Product Button program.
Select another Product Button to program or press the
Read/Clear
button to
"Lock" the new program(s) into memory and exit the programming mode.
End of programming sequence
PROGRAMMING HINT
After inputing a program entry, press Shelf Button A to "advance" to the next
prompt. This will eliminate the need to wait for the readout to advance to the
next question on its own.
000 F
Prod
EntEr
6
PROGRAMMING
OPTIONAL PROGRAMMING CODES
Below are codes which will configure the display to an optional readout or or aid in the operation of the
oven.
The readout must display "ENTER" before the computer will accept any programming code. If the readout
displays any other word, turn the oven Off then back On before beginning the programming sequence.
The control allows for a 3 second delay between each button push, if a delay of longer than 3 seconds has
occurred, the programming code must be re-entered.
The instructions call for pressing exactly what is shown under "PRESS", The following abbreviations are
used to indicate which buttons are to be pressed.
ABBREVIATION MEANING
"1" through "0" Product Buttons
"A" through "E" Shelf Buttons
P Any particular Product Button
Shelf Any particular Shelf Button
R/C Read/Clear Button
M/P Manual Program Button
T Temp Button
R/C HOLD Hold the Read/Clear Button down until "88888" appears
on the Display
( ) Button to press after the display prompt changes
7
PROGRAMMING
PROGRAMMING CODES
CODE DESCRIPTION PRESS
OPERATIONAL
Recall time remaining on a shelf Shelf
Cancel a shelf timer R/C,R/C,Shelf
"One Button Loading" R/C,P,P,P,P,P
Cancel "One Button Loading" R/C HOLD
Multiple products per shelf On R/C,1,2,3,8,7,6
Multiple products per shelf Off R/C,6,7,8,3,2,1
DISPLAY MODES
Countdown timer display R/C,4,8,4,8,4,8
Shelf in use display R/C,0,9,0,9,0,9
Internal oven temperature display R/C,8,7,8,7,8,7
PROGRAMMING
Enter programming mode R/C,1,6,2,7,3,8
Recall an existing product program R/C,R/C,P
Erase a product program R/C,1,6,2,7,3,8 (P) (000)
Model identification R/C,D,C,D,C,D,C
Program download (Contact Factory) R/C,A,B,C,D,E,P
MAINTENANCE
Actual oven temperature R/C,3,4,5,6,7,8
Disable program code requirements (1st generation model only,
B and C serial number prefixes)
R/C,1,6,2,7,3,8 (P) (9,9,9)
Calibrate (1st generation models, B and C serial number
prefixes, and EHS-CIR-BK only)
R/C,M/P,T,6,1,7,2
8
SERVICE
MODEL STRAPPING INSTRUCTIONS
The control panel of the Lang "Purple" computer must be configured to match the model of oven it is being
installed in.
To configure the control panel, change the arrangement of the
Strapping Bars
located at the bottom of the
circuit board just above the ribbon connection.
Each model has its own strapping configuration which
must
be set by the installer of the control.
Follow the diagram below for the proper strapping configuration.
9
SERVICE
CIRCUIT BOARD IDENTIFICATION
10
TROUBLESHOOTING
The following text will assist in determining which of the two circuit boards (control panel or
microprocessor) may have failed.
Locate the symptom in the left column, then refer to the possible causes in the center column, then how to
test for cause in the right column.
SYMPTOM POSSIBLE CAUSE TEST FOR CAUSE
Display
not
coming On
Fan
not
coming On
1.No voltage at microprocessor
2.Broken or loose ribbon
connector
3.Failed control panel
1.Check across 2 red wires at
top of microprocessor for 12
volts AC.
2.Check across 2 pads on right
end of edge connector on
microprocessor for 5 volts DC
3.Check across temperature
sensor pins on control panel
for 5 volts DC (see page 9).
If
Yes - Replace board, No -
Replace ribbon connector
Display
not
coming On
Fan running
1.Failed control panel
2.Broken or loose ribbon
connector
1.Check across 2 pads on right
end of edge connector on
microprocessor for 5 volts DC
2.Check across temperature
sensor pins on control panel
for 5 volts DC (see page 9).
If
Yes - Replace board, No -
Replace ribbon connector
Display On
No heat
1.Program temperature lower
than oven temperature
2.Failed temperature sensor
3.Failed heat output on control
panel
4.Failed mechanical component
(contactor etc.)
1.Check program against
thermometer
2.Check sensor resistance.
3.Jump across 24 volt input and
Heat output wire on control
panel.
4.Place control into Manual
Back-up check operation
Display locks up on "88888"
Fan stops
1. Button being held down by
label
2.Low voltage at microprocessor
1.Check label for dents over
buttons.
2.Check across 2 red wires at
top of microprocessor for 12
volts AC.
Erratic temperature Failed temperature sensor Check sensor resistance (see
page 11).
TROUBLE SHOOTING
11
TEMPERATURE SENSOR VALUES
SENSOR RESISTANCE
This measurement is taken after the Temperature Sensor is unplugged from the connector pins located on
the back of the control panel (see page 9). Do not take this measurement while the Temperature Sensor is
connected to the conrtol panel circuit board.
Resistance vs. Tem perature
Tem perature (deg. F)
Resistance (oh
m
500
600
700
800
900
1000
1100
1200
32
40
60
80
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
SENSOR VOLTAGE DROP
This voltage is measured at the Temperature Sensor connection located on the back of the control panel
(see page 9). Leave the sensor pluged onto the control panel and measure the voltage drop across the
connector pins while the oven is operating at temperature. Once a measurement is taken, remove the plug
from the connector pin and measure across the pins to confirm a 5 volt DC source. Do not fault the
Temperature Sensor if a 5 volt DC source is not present.
Voltage vs. Te m p e rature
Te m p e rature (d e g . F.)
Volts D
1
1.2
1.4
1.6
1.8
2
2.2
2.4
70
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
12
TROUBLESHOOTING
OPERATIONAL SEQUENCE
GAS CONVECTION OVEN
1.) Power switch turned on.
Power to oven
light switch
.
120 volts to rows A and B of 24 pin
terminal block
.
120/24 volt
transformer
energized.
24 volts to rows C and D of 24 pin
terminal block
.
24 volts to center connector of
Back-up toggle switch
.
24 volts to pin A on
Back-up relay
coil.
24 volts to connectors 6 and GR on
spark module
.
2.) Spark module begins sparking at pilot burner
24 volts to pilot valve coil of
combination gas valve
(Grn #33 (which jumps to main valve coil) and
Blu # 32).
Pilot valve opens.
Gas flows to
pilot burner
.
Pilot burner lights.
3.) Pilot light confirmed by spark module
12 to 13 micro amps on pin 4 of
spark module
24 volts from pin 3 (Brn # 34A) on s
park module
to center connector of
Back-up toggle switch
.
4a). Back-up toggle switch Off
Circuit 1
24 volts to line terminal of
control panel
.
24 volts from switch panel (Blu # 13) through door switch to
motor contactor
coil.
Motor contactor closes, door switch closed, motor starts.
Motor centrifugal switch closes ( for heat circuit).
Circuit 2
24 volts to terminal B on
Back-up relay
.
Back-up relay closes, energizing
120/12 volt transformer
.
12 volts to top connector on
microprocessor
.
Computer starts.
Product selected on
Control Panel
.
24 volts from Control Panel (Red # 26) through safety thermostat, through motor centrifugal
switch, to main valve coil of
gas combination valve
.
Main valve opens.
Gas flows to
main burners
.
Main burners light.
13
TROUBLESHOOTING
4b). Back-up toggle switch On
Circuit 1
24 volts (Blu # 12) through door switch to
motor contactor
coil.
Motor contactor closes, door switch closed, motor starts.
Motor centrifugal switch closes (for heat circuit).
Circuit 2
24 Volts to
Back-up thermostat
.
Temperature set on Back-up thermostat
24 volts from Back-up thermostat (Red # 21B) through safety thermostat, through motor
centrifugal switch, to main valve coil of
gas combination valve
.
Main valve opens.
Gas flows to main burners.
Main burners light.
ELECTRIC CONVECTION OVEN
1.) Power switch turned on
Power to oven
light switch
.
208/240 volts to rows A and B of 24 pin
terminal block
.
240/208 to Line 3 points of
motor contactor
.
208/240 volts to terminal 1 on coil of
Back-up relay
.
240/24 volt transformer energized.
240/12 volt transformer energized.
24 volts to rows C and D of 24 pin
terminal block
.
24 volts through
door switch
to terminal 1 on coil of
motor contactor
.
24 volts to common connectors on
Back-up relay
.
12 volts to terminal 1 on
microprocessor
.
12 volts to center connector 1 of
Back-up toggle switch
.
208/240 volts to center connector 2 of
Back-up toggle switch
.
Reset circuit between power toggle switch and bottom of control panel closed (see page 9).
2A.) Back-up toggle switch Off
24 volts input to connector on
control panel
(see page 9).
12 volts to terminal 2 on
microprocessor
(see page 9).
Computer starts
Output from control panel to terminal 2 on coil of
motor contactor
(see page 9).
Motor contactor closes.
Motor starts.
24 volts through motor contactor points (from jumper on coil) to terminal 1 on coil of
heat
contactor
.
Product selected on control panel
24 volts from control panel through
Hi-limit thermostat
to terminal 2 on coil of
heat contactor
(see page 9).
Heat contactor closes.
208/240 volts to elements.
2B.) Back-up toggle switch On
208/240 volts to ternimal 2 on coil of
Back-up relay
.
14
TROUBLESHOOTING
Back-up relay closes.
24 volts to
Back-up Thermostat
24 volts to terminal 2 on coil of
motor conatactor
.
Motor contactor closes.
Motor starts.
24 volts through motor contactor points (from jumper on coil) to terminal 1 on coil of
heat
contactor
.
Temperature set on Back-up Thermostat
24 volts from Back-up Thermostat through
Hi-limit thermostat
to terminal 2 on coil of
heat
contactor
.
Heat contactor closes.
208/240 volts to elements.
15
INDEX
C
control panel, 8
COOKING CURVE
, 2, 3, 4
cooking temperature
, 3, 4
cooking time, 2, 4
countdown timer, 2
D
Display, 4
F
FAN FUNCTION
, 3, 4
L
Light Switch, 4
M
MANUAL PROGRAM, 2
Manual Program Button, 4, 6
P
Power Switch, 4
Product Button, 4, 2, 4, 5, 6
programming, 3, 6
programming code, 3
programming codes, 6
R
Read/Clear
, 4
READ/CLEAR button, 2, 5, 6
Read/Clear" Button, 4
Recall time, 7
S
Shelf Button, 4, 2, 6
Strapping Bars
, 8
T
Temp Button, 6
Temperature Recall Button, 4, 2
TIER
, 3, 4
Tier Lamp
, 4
Tier lamps, 3
Tier" Light, 4
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
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