AccuTemp Accu-Steam G2 Series User manual

AccuTemp Products, Inc. · 8415 North Clinton Park · Fort Wayne, IN 46825
·800 210-5907 · accutemp.net
SP8042-1911
ACCUSTEAM GAS G2 GRIDDLE
SERVICE MANUAL

The State of California enacted the California Safe Drinking Water and Toxic
Enforcement Act of 1986, (Prop. 65), which “prohibits any person in the course
of doing business from knowingly and intentionally exposing any individual to
a chemical known to the State of California to cause cancer or reproductive
toxicity without first giving clear and reasonable warning to such individuals.”
The Governor’s Scientific Advisory Panel added Carbon Monoxide to the list of
hazardous chemicals known to cause reproductive harm.
In order to establish full compliance with Proposition 65, a yellow warning label has
been attached to each gas fired unit manufactured by AccuTemp Products,Inc.
Carbon monoxide would not be present in concentrations that would pose a
“significant risk” to the consumer when the equipment is installed, operated and
maintained as follows:
1. Installed in accordance with all local codes, or in the absence of local codes,
with the current National Fuel Gas Code Z223.1, latest addenda.
2. Installed under a properly designed and operating exhaust hood.
3. Connected to the type of gas for which the unit is equipped.
4. Proper appliance pressure regulator installed on the gas supply line and adjusted
for the manifold pressure marked on the rating plate.
5. Adequate air supply to the unit and adequate clearance around the flue.
6. The equipment is operated in the manner intended using the proper utensil for
that type of appliance.
7. Keep the equipment clean and have it checked periodically.
8. Burner air adjustments, mechanical maintenance and repairs should be
performed by qualified service personnel.
WARNING

Accu-Steam™ G2 Gas Service Manual 2
SP8042-1911
Table of Contents
1.0 Warnings and Cautions
1.1 Warning Symbol Definitions
1.2 Safety Precautions
2.0 Griddle Specification
2.1 Equipment Data Plate
3.0 Sequence of Operation
4.0 Troubleshooting Guide
4.1 Troubleshooting Flowchart
4.2 Diagnosis Table
5.0 Digital Controller
5.1 Operation
5.2 Managers Mode
5.3 Set RTD Probe Oset
6.0 Main Component Identification
7.0 Removal and Replacement of Components
7.1 R&R of Voltage Supply Components
7.2 R&R of Control Boards
7.3 R&R of Ignition System Components
7.4 R&R of Temperature Sensors
8.0 Extended Troubleshooting
8.1 Griddle Surface Temperature Measurement
8.2 Ignition System Testing
9.0 Planned Maintenance
10.0 Wiring Schematic
11.0 Limited Warranty
3
3
4
5
6
7
9
9
10
14
14
15
16
17
19
19
20
21
26
27
27
28
30
31
32
DOCUMENT HISTORY
CURRENT
REVISION
DATE PRIOR
REVISION
DATE CHANGE
1911 11/05/2019 1609 09/14/2016 Review and update of manual

Accu-Steam™ G2 Gas Service Manual 3
SP8042-1911
1. WARNINGS AND CAUTIONS
Symbols are used to attract your attention to possible dangers. They are only
eective if the operator uses proper accident prevention measures. Some of the
symbols are boxed text; while others maybe just picture icons. Please give this
information the respect they deserve for safe operation.
Symbol Icons
Below are definitions of the symbol icons used
in this manual.
CAUTION -
HOT SURFACE
DANGEROUS
VOLTAGE
EARTH GROUND
DANGER
Indicates an imminently hazardous
situation; which, if unchanged, will result
in death or serious injury.
CAUTION
Indicates a potentially hazardous
situation; which, if unchanged, will
result in minor or moderate injury.
NOTE
Advises the reader of information
or instructions, vital to the
operation or maintenance of the
equipment.
1.1 Warning Symbol Definitions

Accu-Steam™ G2 Gas Service Manual 4
SP8042-1911
Electrical shock hazard while working on energized equipment
Unplug equipment prior to removing any components eected by
electricity.
Personnel injury hazard while picking up and/or moving heavy equipment.
Always use at least 2 people and proper lifting techniques when picking-up,
moving, or flipping-over heavy equipment.
In the event of a Power Failure, DO NOT attempt to operate this appliance.
DO NOT store or use Gasoline, or any other Flammable Vapor and/or Liquids
in the vicinity of this or any other appliance.
IMPROPER installation, adjustment, alteration, service, or maintenance
can cause personal injury or death; and/or property damage. Read the
installation, operation, and service/maintenance instructions thoroughly;
before installing or servicing this equipment.
Only QUALIFIED service technicians/electricians should perform the
equipment installation, to ensure that all electrical and safety requirements
are met; and that all wiring is performed in accordance with all national,
state, and local electrical codes.
Griddle may have sharp edges.
The Safety Instructions listed on this page below, should be posted
in a prominent location as a reminder of safe practices; as well as,
recommended actions to follow in the event of an equipment
or facility’s utility issue.
1.2 Safety Precautions

Accu-Steam™ G2 Gas Service Manual 5
SP8042-1911
2. Griddle Specification
AccuTemp Products, Inc.
8415 North Clinton Park • Fort Wayne, IN 46825 • 800-210-5907 • 260-493-0415 • Fax [phone] • accutemp.net
Accu-Steam Gas Griddle Specifications
Model # GGF1201A2450-T1 GGF1201B2450-T1 GGF1201A3650-T1 GGF1201B3650-T1 GGF1201A4850-T1 GGF1201B4850-T1
BTU Firing Rate per Hour 42,300 42,300 70,000 70,000 85,000 85,000
Unit Width (A) 24.25 [616] 24.25 [616] 36.25 [921] 36.25 [921] 48.25 [1226] 48.25 [1226]
Unit/Installation Depth (D) 38.3 [973] 32.3 [820] 38.3 [973] 32.3 [820] 38.3 [973] 32.3 [820]
Cooking Surface Width (B) 23.9 [607] 23.9 [607] 35.9 [912] 35.9 [912] 47.9 [1217] 47.9 [1217]
Cooking Surface Depth (C) 30 [762] 24 [610] 30 [762] 24 [610] 30 [762] 24 [610]
Rear Leg to outside of Flue (E) 12 [305] 6 [152] 12 [305] 6 [152] 12 [305] 6 [152]
Center Left to Right Leg (F) 20 [508] 20 [508] 32 [813] 32 [813] 44 [1118] 44 [1118]
Effective Cooking Area 717 sq. in. 574 sq. in. 1077 sq. in. 862 sq. in. 1437 sq. in. 1150 sq. in.
Grease Pan Capacity 5 qt 5 qt 6 ½ qt 6 ½ qt 6 ½ qt 6 ½ qt
NEMA Plug 5-15 5-15 5-15 5-15 5-15 5-15
ACCU-STEAM™ GRIDDLE GG SERIES
Gas/Steam-Heated,
Tabletop Griddle
MM5208-1803
(C)
(COOKING DEPTH)
3.54 22.75
(COOKING HEIGHT)
(E)
13.24
19.44
(B)
(COOKING WIDTH) (D)
UNIT DEPTH
4.84
(F)
Notes:
1.) Dimensions in brackets [] are metric.
2.) 3/4” NPT gas connection, 90° elbow provided.
3.) 5’ 120 volt power cord.
4.) Amp draw <3/4A.
AccuTemp Products, Inc.
8415 North Clinton Park • Fort Wayne, IN 46825 • 800-210-5907 • 260-493-0415 • Fax [phone] • accutemp.net
Accu-Steam Gas Griddle Specifications
Model # GGF1201A2450-T1 GGF1201B2450-T1 GGF1201A3650-T1 GGF1201B3650-T1 GGF1201A4850-T1 GGF1201B4850-T1
BTU Firing Rate per Hour 42,300 42,300 70,000 70,000 85,000 85,000
Unit Width (A) 24.25 [616] 24.25 [616] 36.25 [921] 36.25 [921] 48.25 [1226] 48.25 [1226]
Unit/Installation Depth (D) 38.3 [973] 32.3 [820] 38.3 [973] 32.3 [820] 38.3 [973] 32.3 [820]
Cooking Surface Width (B) 23.9 [607] 23.9 [607] 35.9 [912] 35.9 [912] 47.9 [1217] 47.9 [1217]
Cooking Surface Depth (C) 30 [762] 24 [610] 30 [762] 24 [610] 30 [762] 24 [610]
Rear Leg to outside of Flue (E) 12 [305] 6 [152] 12 [305] 6 [152] 12 [305] 6 [152]
Center Left to Right Leg (F) 20 [508] 20 [508] 32 [813] 32 [813] 44 [1118] 44 [1118]
Effective Cooking Area 717 sq. in. 574 sq. in. 1077 sq. in. 862 sq. in. 1437 sq. in. 1150 sq. in.
Grease Pan Capacity 5 qt 5 qt 6 ½ qt 6 ½ qt 6 ½ qt 6 ½ qt
NEMA Plug 5-15 5-15 5-15 5-15 5-15 5-15
ACCU-STEAM™ GRIDDLE GG SERIES
Gas/Steam-Heated,
Tabletop Griddle
MM5208-1803
(C)
(COOKING DEPTH)
3.54 22.75
(COOKING HEIGHT)
(E)
13.24
19.44
(B)
(COOKING WIDTH) (D)
UNIT DEPTH
4.84
(F)
Notes:
1.) Dimensions in brackets [] are metric.
2.) 3/4” NPT gas connection, 90° elbow provided.
3.) 5’ 120 volt power cord.
4.) Amp draw <3/4A.
AccuTemp Products, Inc.
8415 North Clinton Park • Fort Wayne, IN 46825 • 800-210-5907 • 260-493-0415 • Fax [phone] • accutemp.net
ACCU-STEAM™ GRIDDLE GG SERIES
Gas/Steam-Heated,
Stand-Mounted Griddle
Notes:
1.) Dimensions in brackets [] are metric.
2.) 3/4” NPT gas connection, 90° elbow provided.
3.) 5’ 120 volt power cord.
4.) Amp draw <3/4A.
MM5209-1803
Accu-Steam Gas Griddle Specifications
Model # GGF1201A2450-S2 GGF1201B2450-S2 GGF1201A3650-S2 GGF1201B3650-S2 GGF1201A4850-S2 GGF1201B4850-S2
BTU Firing Rate per Hour 42,300 42,300 70,000 70,000 85,000 85,000
Unit Width (A) 24.25 [616] 24.25 [616] 36.25 [921] 36.25 [921] 48.25 [1226] 48.25 [1226]
Unit Depth (D) 38.3 [973] 32.3 [820] 38.3 [973] 32.3 [820] 38.3 [973] 32.3 [820]
Cooking Surface Width (B) 23.9 [607] 23.9 [607] 35.9 [912] 35.9 [912] 47.9 [1217] 47.9 [1217]
Cooking Surface Depth (C) 30 [762] 24 [610] 30 [762] 24 [610] 30 [762] 24 [610]
Depth to Rear Leg (E) 8.5 [216] 2.5 [64] 8.5 [216] 2.5 [64] 8.5 [216] 2.5 [64]
Center Right to Left (F) 20 [508] 20 [508] 32 [813] 32 [813] 44 [1117] 44 [1117]
Effective Cooking Area 717 sq. in. 574 sq. in. 1077 sq. in. 862 sq. in. 1437 sq. in. 1150 sq. in.
Grease Pan Capacity 5 qt 5 qt 6 1/2 qt 6 1/2 qt 6 1/2 qt 6 1/2 qt
NEMA Plug 5-15 5-15 5-15 5-15 5-15 5-15
(C)
(COOKING HEIGHT)
(F)
27.65
(A)
(B) UNIT DEPTH
(COOKING WIDTH)
(D)
(E)
(COOKING HEIGHT)
36.05
42.25
PTH
Fig 2.A
Fig 2.B

Accu-Steam™ G2 Gas Service Manual 6
SP8042-1911
2.1 Equipment Data Plate
Model: AA B CCC D E FF GG
Example: GGF1201A4850
Ais the base model N = Natural Gas, P = Propane
B is the model configuration
CCC is the supply Voltage
Dis the number of phases: 1 or 3
Eis the depth
F is the width
Gis the special configuration
Fig 2.C
The Serial Number is also stamped into
the upper right corner of the front plate,
above the grease tray.
Fig 2.D

Accu-Steam™ G2 Gas Service Manual 7
SP8042-1911
1. When the G2 griddle is plugged in, AC line voltage is supplied to the primary side of
the transformer.
2. The voltage out of the secondary side of the transformer is 24VAC nominal. Yellow
and blue wires out of the transformer.
3. The blue leg of the secondary side of the transformer (24VAC) is connected to the
yellow system harness, is split and is connected to the combination gas valve coils,
remote timer connector and the Hi-Limit thermostat.
4. From the HI-Limit thermostat the 24VAC leg is daisy chained to the, heat lamp, the
main digital control board and to chassis ground.
5. The yellow secondary leg of power from the transformer connects to the violet
system harness and goes to the Hi-Limit, then daisy chains over to the main digital
control board. At this time the system is waiting to be powered on via the Digital
control board.
6. Upon pressing the “ON” button on the digital controller, the digital controller powers
up and a relay on the digital controller is closed making a connection between the
grey harness and the white with grey stripe harness connected to the reset of the HI-
Limit thermostat. Also, a relay on the digital controller is closed making a connection
between the violet 24VAC leg and the input of the HI-Limit thermostat through the
white with brown striped harness.
7. If the reading from the Hi-Limit RTD (Resistive Thermal Device) is not 425°F or higher,
an output relay in the Hi-Limit controller will be closed causing the 24VAC to be sent
to the ignition control, DC relay and to the pilot valve coil of the gas combination
valve, opening the pilot valve.
8. If the reading from the Hi-Limit RTD (Resistive Thermal Device) is 425°F or higher, an
output relay in the Hi-Limit controller will be opened causing the 24VAC to be cut off
from the ignition control, DC relay and to the pilot valve coil of the gas combination
valve, closing the pilot valve.
9. The over temperature lamp is connected across the common and the normally open
contacts of the High Limit thermostat output relay. When the relay is activated or
closed, the griddle temperature is below 425°F, there is 24VAC on both sides of the
over temp lamp, preventing it from lighting up. If the High Limit thermostat output
relay is deactivated or open, the griddle temperature is at or above 425°F, the lamp
will see the voltage potential from the chassis ground/yellow system harness side of
the transformer through the pilot valve coil and light up.
10.If the digital controller senses the griddle temperature is below the set point
temperature via the digital controller RTD sensor, the controller will output 24VDC to
the ignition control DC coil relay and allow 24VAC to be sent to the ignition module
via the blue harness to pin 2 of the ignition module, which is daisy chained to the
ignition fault indicator lamp.
11. The ignition module will begin the ignition sequence by initiating a spark at the
ignition probe first then it will send 24VAC, via the red harness from pin #1 of the
ignition module to the heat lamp, which is daisy chained to the main gas valve coil of
the combination gas valve through the red system harness. This allows gas to flow
3. Sequence of Operation

Accu-Steam™ G2 Gas Service Manual 8
SP8042-1911
through the combination gas valve, through the orifices in each main burner and
through the main burner tiles.
12.When the gas/air mixture is ignited, the flame sense probe will detect a DC voltage
level through the flame’s ionized gas to ground via the orange flame sense wire
harness to the ignition module, pin #6.
13.If the DC voltage level is detected before 4 seconds and is at a high enough level the
ignition module will continue to hold the main gas valve open.
14. If the DC voltage level is not high enough within the 4 second window, the ignition
module will shut down the main gas valve.
15.A fault timer is connected across the red and blue harnesses from the ignition
module. When the ignition module is commanded to start the ignition cycle, 24VAC is
present on both the red and the blue harnesses and the timer is deactivated.
16.If the ignition module fails to see a sufficiently high enough DC voltage level through
the flame sense circuit, the ignition module will disable 24VAC from the red harness
and the timer will see the voltage potential from the chassis ground/yellow system
harness side of the transformer and begin an approximate 6 second timer sequence
that controls the ignition fault indicator lamp causing it to flash.
17. When the griddle heats up to the set point temperature, the digital controller RTD
resistance changes and provides a signal to the control board telling it that the set
point temperature has been reached.
18.When the digital controller sees the resistance value for the set point temperature,
it cuts power to the ignition control DC coil relay and breaks the connection to the
ignition module causing the griddle to stop heating further.

Accu-Steam™ G2 Gas Service Manual 9
SP8042-1911
4. Troubleshooting Guide
UNI T ON?
CORRECT
VOLT AGE
CHECK
INTERNAL
VOLT AGE
A
B
C
NO
NO
BREAKER ON?
UNIT PLUGGED
IN?
YES
YES
NO
NO
FAULT LIGHT/
ERROR CODE?
D
E
OVE RTEMP? YES
HE AT ON ?
H
I
NO
UNIT HEATING
UP?
HEAT LIGHT ON?
YES
NO
NO
ERROR CODE
E001?
E002?
PROPER
TEMPERATURE
UNI T
OPERATING
NORMAL
J
YES
NO
NO
YES
YES
YES
YES NO
FAULT LIGHT
FLASHING F
FAULT LIGHT ON G
YES
NO
NO
YES
4.1 Flowchart
UNIT
POWER
ON?
PLEASE REFER TO SELECTED LETTER IN THE NEXT SECTION: 4.2 DIAGNOSIS TABLE.

Accu-Steam™ G2 Gas Service Manual 10
SP8042-1911
APower cord
disconnected
Confirm proper voltage at outlet.
Plug in power cord.
BBreaker is
tripped
Unplug griddle and check line voltage at outlet.
Reset breaker.
C
Temperature
Controller
• If 24VAC is on secondary side of transformer, check power input
terminals of Temp Controller J2-1 & J2-2 (Fig 4.A).
• If 24VAC is at terminals, replace Temp Controller.
• If 24VAC is not at terminals, check for broken wires or poor crimps at the
terminals.
• If no 24VDC at the terminals, measure across the controller outputs J7-1
and J7-2 for 24VDC.
• If no voltage, replace controller.
• If there is voltage, check for poor crimps or loose wires at the terminals.
Fuses Check for loose or blown fuses.
Wiring Inspect wiring for damage, opens and/or shorts. Inspect ground and wire
to wire connections.
*NOTE: Unit has a digital controller, if voltages, fuses and wiring appear to be
in order, try cycling power.
Transformer Check for 24 Volts from secondary side of transformer. If input to
transformer is present and there is no output, replace transformer.
4.2 Diagnosis Table
SCHEMATIC,
G2 GRIDDLE
Fort Wayne, IN 46825
AT2T-3912-1 Rev A
8415 N. Clinton Park
AccuTemp Products, Inc.
AT2T-3912-1
120V-240V
ACCU-STEAM G2 GAS
GRIDDLE
YEL
ORN
BRN
VIO
BRN
YEL
BLU YEL
BLU
RED
ORN
YEL
100 O
PRTD
1000O
PRTD
N.O.
N.C.
COM
7
4
1
N.O.
N.C.
COM
8
5
2
3
6
RLY 2
DC COIL
BRN
WHT/GRAY
GRY
WHT/BRN
WHT/BRN
OVER
TEMP
VIO
L1 L2 N.C. N.O. COM *RTD* RESET
HIGH LIMIT
CONTROLLER
YEL
BRN
ZR1
38V
ZR2
38V PV
MV
GAS VALVE
1
2
3
4
5
6
SPARK
MODULE
GRN
HV IGNITOR
BURNER
BLK
WHT
GRN
2
1
WHT BLK
RED
YEL
BLU
HEAT
REDRED
BLK
WHT
240V
208V
120V COM
24V
RED
ORN
.75 A
F2
.75 A
F1
IGN FAULT
BLU
WHT
FAULT
TIMER
1
2
3
1 2
J2
POWER
INPUT
DIGITAL
CONTROLLER
ON/
OFF
1 2 3 4 5 6
J7
+24V
GND
1 2
J3
SENSOR
INPUT
1 2 3 4 5
ISSP
YEL
VIO
GRN
1
2
J1
3
4
OPTIONAL
REMOTE
TIMER
AT0A-2779-5
TRANSFORMER ASSEMBLY
AT0E-3625-5
Control Board
AT0E-3880-1
HI-LIMIT CONTROL
AT0E-2825-6
Relay, DC
AT0E-1800-2
PILOT LAMP, RED
AT2E-1807-1
IGNITION CONTOL MODULE
AT2E-4717-1
FLAME SENSE PROBE AT2E-4716-1
IGNITOR
AT2E-1806-2
NG CONTROL VALVE
AT2E-1806-3
PROPANE CONTROL VALVE
AT0E-2885-7
HI-LIMIT SENSOR
AT0E-2885-8
TEMPERATURE SENSOR
AT0A-2911-1
AC POWER CORD ASSEMBLY
AT0E-2500-3
TIME DELAY RELAY
AT2B-2099-2
36"& 48"
BURNER
AT2B-2131-2
24"
BURNER
Fig 4.A

Accu-Steam™ G2 Gas Service Manual 11
SP8042-1911
D
Error Code
E001 or E002
on display
• E001: Open Temp (RTD) sensor J3-1 & J3-2. Check terminals for poor
crimping.
• E002: Shorted Temp (RTD) sensor J3-1 & J3-2.
• If RTD checks good, reconnect RTD and cycle power. Is error code still
present - Replace Temperature Controller.
E
Over temp
indicator
• If griddle is not warming up or holding a set point temperature, cycle
power.
• Check that incoming supply voltage is within spec for the unit.
• If Over Temp light goes out, monitor griddle to see if it over temps
again.
• If temperature is greater than 50 degrees dierent than measurement
device, verify measurement device.
• If measurement device appears to be accurate, measure ohms on
Control RTD. If reading is in error - replace Control RTD (Fig 4.B).
• If RTD measures normally, but the control is continually calling for heat
- replace temperature controller.
• If Control RTD and control board are operating normally, check Hi Limit
RTD for proper values at current temperature.
• If temp/resistance values match RTD, replace Over Temp Thermostat.
• If values do not match RTD, replace Over Temp RTD.
SCHEMATIC,
G2 GRIDDLE
Fort Wayne, IN 46825
AT2T-3912-1 Rev A
8415 N. Clinton Park
AccuTemp Products, Inc.
AT2T-3912-1
120V-240V
ACCU-STEAM G2 GAS
GRIDDLE
YEL
ORN
BRN
VIO
BRN
YEL
BLU YEL
BLU
RED
ORN
YEL
100 O
PRTD
1000O
PRTD
N.O.
N.C.
COM
7
4
1
N.O.
N.C.
COM
8
5
2
3
6
RLY 2
DC COIL
BRN
WHT/GRAY
GRY
WHT/BRN
WHT/BRN
OVER
TEMP
VIO
L1 L2 N.C. N.O. COM *RTD* RESET
HIGH LIMIT
CONTROLLER
YEL
BRN
ZR1
38V
ZR2
38V PV
MV
GAS VALVE
1
2
3
4
5
6
SPARK
MODULE
GRN
HV IGNITOR
BURNER
BLK
WHT
GRN
2
1
WHT BLK
RED
YEL
BLU
HEAT
REDRED
BLK
WHT
240V
208V
120V COM
24V
RED
ORN
.75 A
F2
.75 A
F1
IGN FAULT
BLU
WHT
FAULT
TIMER
1
2
3
1 2
J2
POWER
INPUT
DIGITAL
CONTROLLER
ON/
OFF
1 2 3 4 5 6
J7
+24V
GND
1 2
J3
SENSOR
INPUT
1 2 3 4 5
ISSP
YEL
VIO
GRN
1
2
J1
3
4
OPTIONAL
REMOTE
TIMER
AT0A-2779-5
TRANSFORMER ASSEMBLY
AT0E-3625-5
Control Board
AT0E-3880-1
HI-LIMIT CONTROL
AT0E-2825-6
Relay, DC
AT0E-1800-2
PILOT LAMP, RED
AT2E-1807-1
IGNITION CONTOL MODULE
AT2E-4717-1
FLAME SENSE PROBE AT2E-4716-1
IGNITOR
AT2E-1806-2
NG CONTROL VALVE
AT2E-1806-3
PROPANE CONTROL VALVE
AT0E-2885-7
HI-LIMIT SENSOR
AT0E-2885-8
TEMPERATURE SENSOR
AT0A-2911-1
AC POWER CORD ASSEMBLY
AT0E-2500-3
TIME DELAY RELAY
AT2B-2099-2
36"& 48"
BURNER
AT2B-2131-2
24"
BURNER
Fig 4.B
AT0E-2885-3
HI-LIMIT SENSOR

Accu-Steam™ G2 Gas Service Manual 12
SP8042-1911
F
Fault light
flashing
• If burners did not ignite, check gas pressure, cycle power.
• If burners ignite briefly and then fault light is displayed, cycle power and
verify flame sense. See section 8.3.1 Flame Sense for more information.
• If burners did ignite and unit is heating, check for poor connections in the
harness at the fault timer relay (Fig 4.C).
• Ensure that chassis ground connection is tight.
G
Fault light on • If burners did not ignite, replace fault timer.
• If burners did ignite and unit heating, check for short to ground in the white
wire connected to the fault indicator lamp.
SCHEMATIC,
G2 GRIDDLE
Fort Wayne, IN 46825
AT2T-3912-1 Rev A
8415 N. Clinton Park
AccuTemp Products, Inc.
AT2T-3912-1
120V-240V
ACCU-STEAM G2 GAS
GRIDDLE
YEL
ORN
BRN
VIO
BRN
YEL
BLU YEL
BLU
RED
ORN
YEL
100 O
PRTD
1000O
PRTD
N.O.
N.C.
COM
7
4
1
N.O.
N.C.
COM
8
5
2
3
6
RLY 2
DC COIL
BRN
WHT/GRAY
GRY
WHT/BRN
WHT/BRN
OVER
TEMP
VIO
L1 L2 N.C. N.O. COM *RTD* RESET
HIGH LIMIT
CONTROLLER
YEL
BRN
ZR1
38V
ZR2
38V PV
MV
GAS VALVE
1
2
3
4
5
6
SPARK
MODULE
GRN
HV IGNITOR
BURNER
BLK
WHT
GRN
2
1
WHT BLK
RED
YEL
BLU
HEAT
REDRED
BLK
WHT
240V
208V
120V COM
24V
RED
ORN
.75 A
F2
.75 A
F1
IGN FAULT
BLU
WHT
FAULT
TIMER
1
2
3
1 2
J2
POWER
INPUT
DIGITAL
CONTROLLER
ON/
OFF
1 2 3 4 5 6
J7
+24V
GND
1 2
J3
SENSOR
INPUT
1 2 3 4 5
ISSP
YEL
VIO
GRN
1
2
J1
3
4
OPTIONAL
REMOTE
TIMER
AT0A-2779-5
TRANSFORMER ASSEMBLY
AT0E-3625-5
Control Board
AT0E-3880-1
HI-LIMIT CONTROL
AT0E-2825-6
Relay, DC
AT0E-1800-2
PILOT LAMP, RED
AT2E-1807-1
IGNITION CONTOL MODULE
AT2E-4717-1
FLAME SENSE PROBE
AT2E-4716-1
IGNITOR
AT2E-1806-2
NG CONTROL VALVE
AT2E-1806-3
PROPANE CONTROL VALVE
AT0E-2885-7
HI-LIMIT SENSOR
AT0E-2885-8
TEMPERATURE SENSOR
AT0A-2911-1
AC POWER CORD ASSEMBLY
AT0E-2500-3
TIME DELAY RELAY
AT2B-2099-2
36"& 48"
BURNER
AT2B-2131-2
24"
BURNER
Fig 4.C
MAIN VALVE
PILOT VALVE
RED
BWN

Accu-Steam™ G2 Gas Service Manual 13
SP8042-1911
H
Heat light
not on
• If griddle is warming up or regulating at a set point, replace indicator
lamp.
• If griddle is not warming up or regulating at a set point, check to see if
temp demand control relay (24VDC) relay is engaged.
• If control relay is not engaged, check for 24VDC at terminals 7 & 8 from
temperature controller.
• If voltage is at relay coil, replace relay.
• If voltage is not at relay coil, replace temperature controller.
• If ice cube relay is engaged, check for poor connections or broken wires.
Blue wires coming from ignition module or brown wire coming from OT
thermostat.
• If connections are good, replace relay.
I
Unit not
heating up
• Check for 24 VAC to the gas valve.
• If no voltage to the main gas valve check for poor or loose connections
or broken red wire between the “heat” lamp and the gas valve.
• If there is voltage to the red wire of the main gas valve, check for voltage
at the brown wire of the gas valve.
• If there is 24VAC to the brown wire at the pilot gas valve and the pilot
valve has not turned on, replace the gas valve.
• If there is 24VAC to the brown wire at the pilot gas valve and the valve has
turned on, check for proper gas supply and pressures.
• If there is no 24VAC on the brown wire at the pilot gas valve, check for
poor or loose connections or broken brown wire at the gas valve, the
“OT” indicator lamp and the OT thermostat and the demand relay. Repair
as necessary.
J
Inaccurate
Temperature
• If display temperature is greater than 50 degrees dierent than
measurement device, verify measurement device. If measurement device
appears to be accurate, measure RTD.
• If RTD measures normally, replace temperature controller.
• If RTD measures out of specifications (temp/resistance), replace RTD.
SCHEMATIC,
G2 GRIDDLE
Fort Wayne, IN 46825
AT2T-3912-1 Rev A
8415 N. Clinton Park
AccuTemp Products, Inc.
AT2T-3912-1
120V-240V
ACCU-STEAM G2 GAS
GRIDDLE
YEL
ORN
BRN
VIO
BRN
YEL
BLU YEL
BLU
RED
ORN
YEL
100 O
PRTD
1000O
PRTD
N.O.
N.C.
COM
7
4
1
N.O.
N.C.
COM
8
5
2
3
6
RLY 2
DC COIL
BRN
WHT/GRAY
GRY
WHT/BRN
WHT/BRN
OVER
TEMP
VIO
L1 L2 N.C. N.O. COM *RTD* RESET
HIGH LIMIT
CONTROLLER
YEL
BRN
ZR1
38V
ZR2
38V PV
MV
GAS VALVE
1
2
3
4
5
6
SPARK
MODULE
GRN
HV IGNITOR
BURNER
BLK
WHT
GRN
2
1
WHT BLK
RED
YEL
BLU
HEAT
REDRED
BLK
WHT
240V
208V
120V COM
24V
RED
ORN
.75 A
F2
.75 A
F1
IGN FAULT
BLU
WHT
FAULT
TIMER
1
2
3
1 2
J2
POWER
INPUT
DIGITAL
CONTROLLER
ON/
OFF
1 2 3 4 5 6
J7
+24V
GND
1 2
J3
SENSOR
INPUT
1 2 3 4 5
ISSP
YEL
VIO
GRN
1
2
J1
3
4
OPTIONAL
REMOTE
TIMER
AT0A-2779-5
TRANSFORMER ASSEMBLY
AT0E-3625-5
Control Board
AT0E-3880-1
HI-LIMIT CONTROL
AT0E-2825-6
Relay, DC
AT0E-1800-2
PILOT LAMP, RED
AT2E-1807-1
IGNITION CONTOL MODULE
AT2E-4717-1
FLAME SENSE PROBE AT2E-4716-1
IGNITOR
AT2E-1806-2
NG CONTROL VALVE
AT2E-1806-3
PROPANE CONTROL VALVE
AT0E-2885-7
HI-LIMIT SENSOR
AT0E-2885-8
TEMPERATURE SENSOR
AT0A-2911-1
AC POWER CORD ASSEMBLY
AT0E-2500-3
TIME DELAY RELAY
AT2B-2099-2
36"& 48"
BURNER
AT2B-2131-2
24"
BURNER
Fig 4.D

Accu-Steam™ G2 Gas Service Manual 14
SP8042-1911
Unplug griddle from wall receptacle before replacing the
control board in order to prevent damage to equipment.
When power is applied to the control, the control will configure itself to operate in accordance
with the parameters stored in memory. These parameters may be adjusted using Manager’s Mode.
Operating Mode
When power is applied to the control, the control will configure itself to operate in accordance
with the parameters stored in memory. These parameters may be adjusted using Manager’s Mode.
Reset
Pressing and holding the DOWN (S4) arrow key and the ON/OFF (S5) key for five seconds will reset
the software back to the factory default settings.
Error Codes
The control will display error codes for the following conditions:
E001 Displays when controller detects an Open Sensor
E002 Displays when controller detects a Shorted Sensor
9999 No calibration data stored or invalid calibration data detected
To reset from any error, unit must be turned OFF, repaired, and then turned ON.
When any error is displayed, outputs are forced open. The following section illustrates the
programming logic and program level indication:
5. Digital Controller
5.1 Operation
Fig 5.A
H
Heat light
not on
• If griddle is warming up or regulating at a set point, replace indicator
lamp.
• If griddle is not warming up or regulating at a set point, check to see if
temp demand control relay (24VDC) relay is engaged.
• If control relay is not engaged, check for 24VDC at terminals 7 & 8 from
temperature controller.
• If voltage is at relay coil, replace relay.
• If voltage is not at relay coil, replace temperature controller.
• If ice cube relay is engaged, check for poor connections or broken wires.
Blue wires coming from ignition module or brown wire coming from OT
thermostat.
• If connections are good, replace relay.
I
Unit not
heating up
• Check for 24 VAC to the gas valve.
• If no voltage to the main gas valve check for poor or loose connections
or broken red wire between the “heat” lamp and the gas valve.
• If there is voltage to the red wire of the main gas valve, check for voltage
at the brown wire of the gas valve.
• If there is 24VAC to the brown wire at the pilot gas valve and the pilot
valve has not turned on, replace the gas valve.
• If there is 24VAC to the brown wire at the pilot gas valve and the valve has
turned on, check for proper gas supply and pressures.
• If there is no 24VAC on the brown wire at the pilot gas valve, check for
poor or loose connections or broken brown wire at the gas valve, the
“OT” indicator lamp and the OT thermostat and the demand relay. Repair
as necessary.
J
Inaccurate
Temperature
• If display temperature is greater than 50 degrees dierent than
measurement device, verify measurement device. If measurement device
appears to be accurate, measure RTD.
• If RTD measures normally, replace temperature controller.
• If RTD measures out of specifications (temp/resistance), replace RTD.

Accu-Steam™ G2 Gas Service Manual 15
SP8042-1911
Managers mode is used to setup initial operational parameters for the appliance prior to the first
time of production use.
Manager’s mode
1. Entering Managers mode, press and hold the DOWN arrow key and the Asterisk key
together for about eight seconds, to initiate the programming mode. When the mode is
accessed, all three LED lights will blink synchronously.
2. Once in managers mode, the display will show the DEFAULT COOK TEMP, (see Fig 4.E, P# 1)
3. To cycle between programs, use UP arrow key and DOWN Arrow key. For example, to
reach Program #2, Ready Mode Display, the UP arrow would be pushed once, cycling from
Program #1 Default Cook Temperature to Program #2.
4. To adjust the selected program, use Preset 2 key or Asterisk key to adjust the Program Settings
(Fig 4.E & 4.F).
5. When all changes are completed Exit the Managers mode and save the new parameters by
pressing the Preset 1 key
P#2
Value
Default
Display
Display when there is a ,
or momentary key press
Display when there is a key press
0/00 rdYSet Point Temperature Set Point Temperature
1/00 Set Point Tempera-
ture
Set Point Temperature Actual Temperature
2/00 rdYrdYrdY
3/00 Set Point Set Point Temperature Set Point Temperature
This chart illustrates the programming logic and program level indication
Programming Example - Adjusting the Default Temp.
1. Press and hold the DOWN arrow key and the Asterisk key together for about eight
seconds, to initiate the programming mode. When the mode is accessed, all three LED lights
will blink synchronously.
2. The display will show the default temperature (350°F from factory).
3. Use the use Preset 2 key or Asterisk key to increase or decrease the temperature on the
display.
4. With the desired temperature displayed the Preset 1 key to save. The unit will power down.
5. When the unit is restarted, the display will now show the new default temperature and start
heating.
5.2 Managers Mode
Fig 5.B
Fig 5.C
Mode P# LED1 LED2 LED3 Program description Default Display Min Setting Max Setting
0B B B Unit of Measure (°F) 0/00 0/00 = F 0/01 = C
1B B B Default Cook Tempera-
ture
350F
175C
350F
175C
200F
90C
400F
205C
2B B B Ready Mode Display 0 2/00 0 3
3B B B Probe Oset -10 +10 0 0

Accu-Steam™ G2 Gas Service Manual 16
SP8042-1911
5.3 Set RTD Probe Oset
In certain circumstances, the measurement from the RTD probe can be adjusted at the control
board, thereby adjusting when the unit will call for heat.
This process should only be performed by a qualified technician with access to a weighted
surface probe.
1. Turn unit on: depress the 1/0 key (To turn o the unit press and hold the 1/0 key for
approximately five seconds).
2. (Reference Fig 5.B) Press and hold the DOWN arrow key and the * key for about eight seconds
to enter Manager’s mode while the unit is on. In Manager’s mode, the first field displayed will
be the Parameter# 1, DEFAULT COOK TEMP. Scroll to the probe oset mode using the UP
arrow key or DOWN arrow key.
• Hand held field temperature meter that shows a higher temperature than the griddle
displayed temperature. Press the Preset 2 key to increase the oset number by the number
of degrees o. The griddle display will indicate the oset in as a positive number.
• Hand held field temperature meter that shows a lower temperature than the griddle
displayed temperature. Press the Asterisk (*) key to decrease the oset number by the
number of degrees o. The griddle display will indicate the oset in as a negative number.

Accu-Steam™ G2 Gas Service Manual 17
SP8042-1911
Power Cord
AT0A-2911-1
• Includes plug for connection to 120V
outlet.
Transformer
AT0E-2662-7
SN 18282 and above
(When replacing under SN 18182 use kit
AT0A-5076-1).
• Steps down the line voltage to
approximately 24VAC nominal
Timer, Ignition Fault
AT0E-2500-3
• Controls fault light.
• If signal is lost from the ignition
module the timer causes ignition fault
light to turn on in flashing sequence.
Control Relay, 24vdc
AT0E-2625-6
• Controls input signal to ignition
module.
• Coil side of relay is energized by DCV
output of digital control board.
Infrared Burner - Gas (36” & 48”)
AT2B-2099-2
• Supplies heat to the griddles steam
chamber
• Supplies flame for flame sensor
Flame Sensor
AT2E-4717-1
• When in direct contact with the
flame, the sensors gives o a DC
Micro amp signal to the ignition
module.
Igniter
AT2T-5035-1
• Receives voltage from ignition
module.
• Ignites burners. (1/8”-3/16” Gap)
AT2E-1806-2
Natural Gas Valve, 5” WC (H20)
AT2E-1806-3
Liquid Propane Valve, 10” WC (H20)
• Regulates incoming gas pressure
(1/2lb or 14”WC max unregulated
incoming pressure)
• Primary valve (pilot) opens when
control board is powered on and the
secondary (main) valve opens and
supplies gas to the burners when the
control board calls for heat.
Ignition Control Module
AT2E-1807-1
• Takes reading from the flame sensor.
• Receives input power from DC Relay
• Sends voltage to the igniter.
• Controls secondary gas valve (main)
and heat lamp
6. Main Component Identification

Accu-Steam™ G2 Gas Service Manual 18
SP8042-1911
Digital Control Board
AT0E-3625-5-R** (R** refers to software
revision of board programming).
• Receives input signal from RTD
Temperature Sensor.
• Sends DCV output signal to Control
Relay coil which controls igntion
module.
Fuse .75 Amp 250v
AT0E-2731-4
• The .75A fuse is to provide protection
to the control circuitry in case of a
short in the system.
Hi-Limit Control Board
AT0E-3880-2
• Receives input signal from Hi-Limit
RTD temperature sensor
• Cuts power to ignition module and
pilot valve when unsafe signal is met
from Hi-Limit RTD (approximatively
425° or 1820Ω)
Temperature Sensor RTD
AT0E-5062-1 (1000 OHM)
• The RTD provide temperature
reference information to the
Temperature Control. This RTD is a
1000Ω.
Hi-Limit Temperature Sensor, RTD
AT0E-5062-1 (1000 OHM)
SN 18182 and above
(When replacing under SN 18181, order
kit AT2A-5063-1).
• The RTD provides temperature
reference information to the Hi-Limit
Board. When replacing under SN
18181, order kit AT2A-5063-1, if over
SN 18182, use part AT0E-5062-1.
Heat Lamp 24v Red
AT0E-1800-2
• Receives 24VAC power from the
ignition module and indicates the
valve is open.
Hi-Limit
RTD
Temp Sensor
RTD Igniter
Fuse Block Transformer Fault Timer Hi-Limit Control
board
Ignition Control
Module
Main Control Board
Control
Relay
Control Valves Tap
Fig 6.A

Accu-Steam™ G2 Gas Service Manual 19
SP8042-1911
Fuse .75 Amp 250V
AT0E-2731-4
1. Unplug from wall receptacle.
2. Lower front access panel by removing the
screws in the upper corners of the panel (Fig
7.1A).
3. Replace fuse.
Ensure that the fuse block holder is
secure and the fuses do not slip once in place
as this can cause ignition issues
7. Removal and Replacement of Components.
Power Cord
AT0A-2911-1
1. Unplug from wall receptacle.
2. Lower front access panel by removing the
screws in the upper corners of the panel.
3. Locate transformer and note the location
of the wires and their terminals, disconnect
wires.
4. On the inside of the unit, remove the
retaining nut on the threads of the Power
Cord Cable Fitting & pullout the Power Cord
(Fig 7C).
5. Reinstall in reverse order.
7.1 Voltage Supply Components
1. Unplug from wall receptacle.
2. Lower front access panel by removing the
screws in the upper corners of the panel.
3. Locate transformer and note the location
of the wires and their terminals, disconnect
wires (Fig 7.1B).
4. Removed nuts securing transformer.
5. Remove transformer.
6. Reinstall in reverse order.
Transformer
AT0E-2662-5
Fig 7.1A
Fig 7.1B
Fig 7.1C