Page 1
SERVICE MANUAL
ACCU-STEAM GAS G2 GRIDDLE
WARNING
Improper installation, alteration,
adjustment,service, cleaning or maintenance
of this commercial appliance could result in
property damage, serious injury or death.
Read and understand the installation, operational,
maintenance instructions before installing,
servicing, or operating this commercial
appliance.
AccuTemp Products, Inc. · 8415 North Clinton Park · Fort Wayne, IN 46825 ·800 210-5907 · accutemp.net
Record the serial number, model number (identication
decal located on the left side panel of the commercial
appliance) , voltage and the install date. Please have
this information when calling for assistance.
Serial Number:
Model:
Install Date:
NOTE
Page 2
Toll Free 800.480.0415
Ofce 260.469.3040
Fax 260.493.8914
Email service@accutemp.net
Web Site www.accutemp.net
PAGE 2
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 3
WARNING SYMBOL DEFINITIONS
SYMBOL DEFINITIONS
Symbols are used to attract your attention to possible dangers. They are only effective 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.
Warning Text Boxes
Below are denitions of the warning text boxes.
DANGER
Indicates an imminently hazardous situation;
which, if unchanged, will result in death or
serious injury.
WARNING
Indicates a potentially hazardous situation;
which, if unchanged, will result in death or
serious injury.
Symbol Icons
Below are denitions of the symbol icons used
in this manual.
ALERT
Noties the reader of an import-
ant message or warning; usually a
safety related message.
INFORMATION
Noties the reader of an important
information that may or may not
be safety related.
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.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
CAUTION -
HOT SURFACE
DANGEROUS
VOLTAGE
EARTH GROUND
PAGE 3
Page 4
SAFETY PRECAUTIONS
DANGER
ELECTRICAL SHOCK HAZARD WHILE WORKING ON
ENERGIZED EQUIPMENT.
Unplug equipment prior to removing any components effected by electricity.
PERSONNEL INJURY HAZARD WHILE PICKING UP OR
MOVING HEAVY EQUIPMENT.
Always use at least 2 people and proper lifting techniques when picking-up, moving, or
ipping-over heavy equipment.
PAGE 4
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 5
IMPORTANT FOR YOUR SAFETY
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.
WARNING
In the event of a Power Failure, DO NOT attempt to operate this appliance.
WARNING
DO NOT store or use Gasoline, or any other Flammable Vapor and/or Liquids in the vicinity of this
or any other appliance.
WARNING
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.
WARNING
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.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 5
Page 6
WARNING & CAUTION NOTES
WARNING
ONLY QUALIFIED SERVICE TECHNICIANS SHOULD PERFORM MAINTENANCE ON THIS
EQUIPMENT.
CAUTION
GRIDDLE MAY HAVE SHARP EDGES.
PAGE 6
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 7
Table of Contents
Sequence of Operation .............................................................................................................
Specication Sheet ...................................................................................................................
Troubleshooting Guide .............................................................................................................
Digital Controller .....................................................................................................................
Replaceable Components .........................................................................................................
Parts Identication, Removal and Installation
-Fuses .......................................................................................................................................
-Control Relay ..........................................................................................................................
-Control Board .........................................................................................................................
-Hi_Limit Control Board .........................................................................................................
-Transformer ............................................................................................................................
-Heat Lamp ..............................................................................................................................
-Fault Timer .............................................................................................................................
-Gas Valve ...............................................................................................................................
-Ignition Control Module ........................................................................................................
-Flame Sensor .........................................................................................................................
-Igniter .....................................................................................................................................
-Infrared Burner .....................................................................................................................
-RTD Sensor(s) ........................................................................................................................
8-9
9
10-12
13-14
15
16
16
17
17
18
18
18
19
19
20
20
20
21
Testing
-RTD ........................................................................................................................................
-Flame Sense ...........................................................................................................................
-Gas Pressure ..........................................................................................................................
Preventative Maintenance ........................................................................................................
Schematic ................................................................................................................................
Warranty .................................................................................................................................
21
22
23
24
24
26
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 7
Page 8
Sequence of Operation
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 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 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 harness to the ignition
module, pin #6.
PAGE 8
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 9
Sequence of Operation
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.
Griddle Specications Sheet
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 9
Page 10
Troubleshooting Guide
UNI T ON?
CORRECT
VOL T AGE
CHECK
INTERNAL
VOL T 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 O N?
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
PAGE 10
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 11
Troubleshooting Guide
Power cord
A
disconnected
Breaker is
B
tripped
Temperature
Controller
C
Fuses Check for loose or blown fuses.
Wiring Inspect wiring for damage, opens and/or shorts. Inspect ground and wire to wire
Transformer Check for 24 Volts from secondary side of transformer. If input to transformer is
Error Code
E001 or E002
D
on display
Conrm proper voltage at outlet.
Plug in power cord.
Unplug griddle and check line voltage at outlet.
Reset breaker.
If 24VAC is on secondary side of transformer, check power input terminals of Temp
Controller J2-1 & J2-2.
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.
connections.
Note* Unit has a digital controller, if voltages, fuses and wiring appear to be in order,
try cycling power.
present and there is no output, replace transformer.
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.
Over temp
indicator
E
Fault light
ashing
F
If griddle is not warming up or holding a set point temperature, cycle power.
Check Over Temp 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.
If Over Temp and Heat light are on and griddle is not warming, cycle power.
If Over Temp light goes out, monitor griddle to see if it over temps again.
If temperature is greater than 50 degrees different 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 specications, replace RTD.
If burners did not ignite, check gas pressure, cycle power.
If burners did ignite and unit is heating, check for poor connections in the harness at
the fault timer relay.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 11
Page 12
Troubleshooting Guide
Fault light on If burners did not ignite, replace fault timer.
G
Heat light not onIf griddle is warming up or regulating at a set point, replace indicator lamp.
H
Unit not heating up
I
If burners did ignite and unit heating, check for short to ground in the white wire
connected to the fault indicator lamp.
If griddle is not warming up or regulating at a set point, check to see if temp demand ice
cube (24VDC) relay is engaged.
If ice cube 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.
Check for 24 VAC to the gas valve.
If no voltage to the 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 gas valve, check for voltage at the brown wire of
the gas valve.
If there is 24VAC to the brown wire at the gas valve and the valve has not turned on,
replace the gas valve.
If there is 24VAC to the brown wire at the 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 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.
Inaccurate
Temperature
J
PAGE 12
If display temperature is greater than 50 degrees different 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 specications (temp/resistance), replace RTD.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 13
Digital Controller
When power is applied to the control, the control will congure itself to operate in accordance with the
parameters stored in memory. These parameters may be adjusted using Manager’s Mode.
NOTE:
Unplug griddle from wall receptacle before replacing the control
board in order to prevent damage to equipment.
Change Cooking/ Default/ Preset Temperatures
1. Turn the griddle on by pressing the ON/OFF (S5) button.
2. Hold the UP (S1) arrow in for 3 seconds until all 3 lights start to ash.
3. Press the UP (S1) or DOWN (S4) arrow until desired temp is displayed.*
4. Once the desired temp is displayed it can be saved as a preset temperature by immediately holding down
PRESET TEMP 1 (S2) or PRESET TEMP 2 (S3), until unit shuts off. It can also be save as the default on
temp by turning off the griddle
Lock/Unlocked Note*
If temperature is unable to be adjusted, user may need to unlock the system by holding down the
ON/OFF (S5) button and Temp (S6) button together for 8 seconds or until “ULOC” is displayed. Once the
temperatures are saved, it is recommend the user locks the system by holding down the
ON/OFF (S5) button and Temp (S6) button together for 8 seconds or until “LOC” is displayed. This will allow
the cooks to only use the preferred settings.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 13
Page 14
Digital Controller
Operating Mode
When power is applied to the control, the control will congure 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 ve 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 chart illustrates the programming logic and
program level indication:
PAGE 14
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 15
Main Components and Purpose Refer
ence
Transformer
AT0E-2662-5
Timer, Ignition Fault
AT0E-2500-3
Control Relay, 24vdc
AT0E-2625-6
Infrared Burner - Gas (36” & 48”)
AT2B-2099-2
Flame Sensor
AT2E-4717-2
Igniter
A22E-4716-1
Natural Gas Valve, 5” WC (H20)
AT2E-1806-2
Ignition Control Module
AT2E-1807-1
Digital Control Board
AT0E-3625-5
-Steps down the line voltage to approximately 24VAC
nominal
-Controls fault light.
-If signal is lost from the ignition module the timer
causes ignition fault light to turn on
-Controls input signal to ignition module.
-Coil side of relay is energized by digital control board.
-Supplies heat to the griddles steam chamber
- Supplies ame for ame sensor
-When in direct contact with the ame, the sensors gives
off a DC Millivolt or DC Micro amp signal to the
ignition module.
-Receives voltage from ignition module.
- Ignites burners. (1/8”-3/16” Gap)
-Regulates incoming gas pressure (1/2lb or 14”WC max
unregulated incoming pressure)
-First valve opens when control board is powered on and
the second valve opens and supplies gas to the burners
when the control board calls for heat.
-Takes reading from the ame sensor.
-Receives input from temperature Controller and
Hi-Limit.
-Sends voltage to the igniter.
-Controls gas valve and heat lamp
-Receives input signal from RTD Temperature Sensor.
-Pulls in relay which controls the ignition module.
Fuse .75 Amp 250v
AT0E-2731-4
Hi-Limit Control Board
AT0E-3880-1
Temperature Sensor RTD
AT0E-2885-8
(Black heat shrink sleeve for 1000Ω identication)
Hi-Limit Temperature Sensor, RTD
AT0E-2885-7
(Red heat shrink sleeve for 100Ω identication)
Heat Lamp 24v Red
AT0E-1800-2
Accu-Steam™ G2 Gas Service Manual
-The .75A fuse is to provide protection to the control cir-
cuitry in case of a short in the system.
-Receives input signal from Hi-Limit RTD temperature
sensor
-Cuts power to ignition module when unsafe signal
is met from Hi-Limit RTD (approximatively 425° or
182Ω)
- The RTD provide temperature reference information to
the Temperature Control. This RTD is a 1000Ω.
- The RTD provide temperature reference information to
the Hi-Limit Board. This RTD is a 100Ω.
-Receives 24VAC power from the ignition module and
indicates the valve is open.
SP8042-1609
PAGE 15
Page 16
Parts Identication, Removal and Installa
tion
Control Valves Tap
Fuse Block Transformer Fault Timer Hi-Limit Control board
Control Relay
Hi-Limit RTD Temp Sensor RTD Igniter
Fuse .75 Amp 250V
AT0E-2731-4
Main Control Board
Ignition Control Module
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws
in the upper corners of the panel.
3. Replace fuse.
Control Relay
AT0E-2825-6
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Take note of wire location
4. Remove wires and hardware securing relay.
5. Reinstall in reverse order.
PAGE 16
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 17
Parts Identication, Removal and Installa
tion
Digital Control Board
AT0E-3625-5
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Locate the main control board. Take note of wires
and their terminals, remove wires.
4. Remove nuts and washers securing board to panel,
remove panel.
5. Reinstall in reverse order.
IMPORTANT NOTICE: Failure to unplug the unit
before pulling wires from the board could result in
fatal damage to the controller.
Hi-Limit Control Board
AT0E-3880-1
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Locate the Hi-Limit control board. Take note of
wires and their terminals, remove wires.
4. Remove nuts and washers securing board to panel,
remove panel.
5. Reinstall in reverse order.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 17
Page 18
Parts Identication, Removal and Installa
tion
Transformer
AT0E-2662-5
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. Removed nuts securing transformer.
5. Remove transformer.
6. Reinstall in reverse order.
Heat Lamp
AT0E-1800-2
Hi-Limit Lamp
AT0E-1800-2
Fault Lamp
AT0E-1800-2
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Locate the light bar and remove wires from lamp.
4. Remove nuts securing the light bar to the front
panel.
5. Remove lamp.
6. Reinstall in reverse order.
Fault Timer
ATOE-2500-3
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Locate the Fault timer, take note of wire location
and remove wires.
4. Remove hardware securing timer.
5. Remove timer.
6. Reinstall in reverse order.
7. Set timer pot to 6 seconds.
PAGE 18
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 19
Parts Identication, Removal and Installa
tion
Gas Valve
AT2E-1806-2
1. Unplug from wall receptacle.
2. Turn off gas supply and disconnect the unit from
supply hose.
3. Lower front access panel by removing the
screws in the upper corners of the panel.
4. Take note of or mark wire location and remove
wires.
5. Disconnect brass gas lines from cross tting
6. Disconnect union and remove assembly
7. Remove cross tting
8. Reinstall in revers order; applying new pipe
dope to ttings
Ignition Control Module
AT2E-1807-1
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Locate the module and remove wires.
4. Remove hardware securing module.
5. Remove module.
6. Reinstall in reverse order.
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 19
Page 20
Parts Identication, Removal and Installa
tion
Flame Sensor
AT2E-4717-1
1. Unplug from wall receptacle.
2. Lower front access panel by removing the
screws in the upper corners of the panel.
3. Remove orange ame sense wire.
4. Remove screws and ame sensor
5. Reinstall in reverse order.
Igniter
AT2E-4716-1
1. Unplug from wall receptacle.
2. Lower front access panel by removing the
screws in the upper corners of the panel.
3. Remove igniter wire
4. Remove screws and igniter
5. Reinstall in reverse order.
6. Set new igniter gap between 1/8”-3/16’’
Infrared Burner
AT2B-2099-2
1. Unplug from wall receptacle.
2. Turn off gas supply and disconnect the unit from
supply hose.
3. Remove gas line at venture
4. Remove front 2 nuts fully and loosen back 2
nuts securing burner
5. Remove Burner
6. Reinstall in reverse order.
Note: When diagnosing a bad burner, often
times the exterior back side of the burner will
have black or gray discoloration in a circular
or half moon shaped
pattern.
PAGE 20
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 21
Parts Identication, Removal and Installa
tion
Temperature Sensor, 1000 Ω RTD
AT0E-2885-8 (Black heat shrink)
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws in
the upper corners of the panel.
3. Locate and remove RTD wires attached to the main
control board .
4. Remove nut securing RTD to griddle .
5. Reinstall in reverse order.
Hi-Limit Sensor, 100 Ω RTD
AT0E-2885-7 (Red heat shrink)
1. Unplug from wall receptacle.
2. Lower front access panel by removing the screws
in the upper corners of the panel.
3. Locate and remove RTD wires attached to the HiLimit control Board.
4. Remove nut securing RTD to griddle .
5. Reinstall in reverse order.
NOTICE: Failure to unplug the unit before
pulling wires from the board could result in
fatal damage to the control board.
RTD Testing
RTD Resistance Chart
Temp
70 108.22 1082.25
100 114.68 1146.82 300 156.91 1569.10
125 120.03 1200.38 325 162.08 1620.88
150 125.37 1253.72 350 167.24 1672.44
175 130.68 1306.84 375 172.37 1723.77
200 135.97 1359.74 400 177.48 1774.89
225 141.24 1412.41 425 182.57 1825.78
250 146.48 1464.86 450 187.64 1876.45
275 151.7 1517.09 475 192.68 1926.89
Hi-Limit Sensor
(100 Ohm)
Temp Sensor
(1k Ohm)
Temp
Hi-Limit Sensor
(100 Ohm)
Temp Sensor
(1k Ohm)
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 21
Page 22
Ignition System Testing
When trouble shooting ignition problems it is absolutely imperative to start off by
taking incoming/outgoing gas pressure and to get a reading from the ame sensor. These
three measurement are the most useful readings a technician can take when diagnosing
AccuTemp gas equipment and are often the most neglected.
Flame Sense
The ACCU-STEAM G2 gas griddle has a ame sensing circuit to determine if the system has proper
combustion. When the system is turned on gas is sent to the burner and an electronic ignition tries to ignite
the griddle. The griddle then checks to see if ame is established in the burner. If the ame sense feedback is
within the proper range the system will stay on until the digital temperature controller is satised. The griddles’
ignition module continues to monitor the voltage and as long as its within the proper range the griddle will stay
on. If the ame sense reading falls below the threshold (13mV or .32uA) the griddle will go into lock out and
will stop heating. When a lock out occurs, the fault indicator light should illuminate.
Micro-amp ame sense reading
A meter with micro amp (<A) selection or a micro amp adapter must be place in series with the orange ame
sense wire. To check micro amps, disconnect the orange wire from the ame rod and connect the amp meter in
series by attaching one lead of the meter to the ame sense rod terminal and the other lead to the orange wire.
Millivolts ame sense reading
An Accutemp volt-measuring adapter P/N FT0003 (meter set for millivolts) is placed in parallel with the orange
ame sense circuit. To check millivolts, attach one end of the adapter to the orange wire and the other to ground.
If the burner is lighting, determine if the sensing signal level is 30mV (1.38uA) or higher.
A. If the reading is less than 30mV (1.38uA), check for proper gas pressures to the dual valve. For natural gas,
the pressures must be 5” water column for the main gas valve. For propane gas, the pressures must be 10” water
column.
B. If the gas pressures are good but the sensing signal level is still poor, check burner orice for obstruction.
Clean or replace as necessary.
C. If the gas pressures are good, the pilot orice is clean, the burner surface is glowing orange to bright orange
but the signal level is still poor, clean or replace the ame sense probe.
Four types of meter readings are possible:
1) 0 millivolts or micro amps – Look for an open or grounded sensor wire or ame rod,
or a defective ignition module. The wire and rod can be diagnosed with an ohmmeter.
2) Steady 30 DC millivolts or 1.38 micro amps or higher – The system is operating within normal parameters.
3) Fluctuating meter reading – Check that the ame sensor probes are properly located. Also check for drafts
that can cause an unstable ame. A dirty orice can also cause an unstable ame.
4) Less than 30 millivolts or 1.38 micro amps – Verify the ame-sensing rod is properly engulfed in the ame.
A ame sensor probe too close to the tile will not be in the proper part of the ame, with not enough ionized gas
to allow a proper signal level to be conducted. Conversely, the same thing holds true if the ame sensor
is too high. Also check the ground connection back to the ignition module. Check that the ame-sensing rod and
ground plane are not oxidized. Clean both with a non aluminum oxide abrasive.
PAGE 22
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
Page 23
Ignition System Testing
When trouble shooting ignition problems it is absolutely imperative to start off by
taking incoming/outgoing gas pressure and to get a reading from the ame sensor. These
three measurement are the most useful readings a technician can take when diagnosing
AccuTemp gas equipment and are often the most neglected.
Gas Pressures
The ACCU-STEAM G2 gas griddle requires the proper gas pressure setting to operate properly. All pressure
readings should be taken after the unit has reached a temperature of at least 200°F and while it is running to
ensure proper ow rates.
Required Material:
Manometer, 1/8” NPT barbed hose tting one 2 inch long lengths of approx. 1/8” diameter exible rubber hose
(closed on one end).
Tasks:
1) Verify pressure regulator vent are clear before making any pressure adjustments.
2) Remove the 1/8” NPT pipe plug from the main gas valve and install the 1/8” NPT barbed hose tting.
Tighten and mount one length of the rubber hose.
3) Allow the appliance to heat up to at least 200°F. First, check the main burner regulator pressure. Remove
the rubber hose and replace with the manometer tube. The pressure should be 5” WC for natural gas and
10“WC for propane. If the outgoing pressure does not meet this values, remove the cap on the main burner
pressure regulator and adjust it to the necessary value.
4) Replace the hose ttings with original plug.
The internal dual gas valves are rated for a low pressure systems. Low pressure is 1/2lb (14” water column) or
less. An external regulator should ONLY be used if incoming gas pressure exceeds this value. If incoming gas
pressure does not meet 7” water column for Natural gas or 12” water column for propane then the Technion
should rst check to see if there is an external regulator installed and if there is not, the gas supply company
should be contacted and asked to raise the supply pressure to the building. Another inspection point in the gas
system is the gas supply lines. The recommended gas supply hose is commercial grade (Dormant) 3/4” ID
and not to exceed 4 feet in length from the main supply. When inspecting the gas supply system, verify there
are no restricting adapters or regulators (Unless on a high pressure system) .
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 23
Page 24
Preventative Maintenance
GENERAL
ITEMS
BI-ANNUAL
ITEMS
ANNUAL
ITEMS
Verify that the appliance is level and properly located under the
hood.
Verify that the temperature controller is working properly, that
there are no rips in the label.
Check that the splash shield at the top of the control panel is
into control panel.
Inspect the control compartment for foreign particulate and any
loose wiring or connections.
Verify the operation and condition of the igniter probe assembly.
sensor that could cause the unit not to light.
Inspect combustion chamber and the burner tiles. If water
present.
Inspect the ignition wire harness for any evidence of high
clean mating connector imbedded in ignition module.
Check output of control transformer after unit has been running
greater than 20 volts, if less than this replace transformer.
General Gas Appliance Periodic Maintenance (PM) Recommendations
AccuTemp Products, Inc.
PM TASK DESCRIPTION
X
X
under the rail provided. If not water and or grease can migrate
Daily. A back draft diverter has been installed at the factory this
will keep scrapings from spatulas from dropping down the flue
and will provide addition protection from back drafts that can
effect burner operation. Check that flue has not been pushed in
resulting in an uneven opening across the flue passage. Pull
flue out so that flue opening is even across width of appliance.
Probes should be cleaned with a wire brush and/or emery cloth.
. Caution: DO NOT use any abrasive that contains
aluminum oxide. This will leave a coating on the flame
Clean all gas orifices, making sure the orifice is clear and
unobstructed. It may be necessary to a drill the same size of
the orifice, if very soiled.
Inspect the burner venturi tubes for foreign particulate. Wipe
out with a mild detergent and warm water and rinse with clean
water.
X
X
X X X
X X
X X
X X
stains are present on tiles check that tiles have no cracks and
haven’t sunk into the burner. Replace burners if this condition is
temperature degradation or grease build-up on harness
connector. Spray contact cleaner into white connector and
Verify ignition module voltage output. Greater than 30 MV
(1.38uA).Must have Accutemp adaptor ATR-FT003 to check
millivolts. Install ground strap between stand-by burner and
control panel to improve ground plane performance.
Verify internal gas pressure.
for several hours, the output of the secondary coil must be
NOTES:
1) AccuTemp-approved service providers should complete these PM tasks.
Accu-Steam™ G2 Gas Service Manual
PAGE 24
SP8042-1609
X X X
X X
X X
X
X X
Page 25
MV
OPTIONAL
REMOTE
TIMER
AC POWER CORD ASSEMBLY
GAS VALVE
38V
YEL
ZR1
AT2E-1806-2
NG CONTROL VALVE
ZR2
AT2E-1806-3
PROPANE CONTROL VALVE
PV
38V
AT2E-4717-1
FLAME SENSE PROBE
IGNITOR
AT2E-4716-1
HV IGNITOR
BURNER
36"& 48"
BURNER
AT2B-2099-2
AT2B-2131-2
24"
BURNER
AT2T-3912-1
120V-240V
ACCU-STEAM G2 GAS
GRIDDLE
SPARK
MODULE
ORN
YEL
8415 N. Clinton Park
Fort Wayne, IN 46825
AccuTemp Products, Inc.
Relay, DC
AT0E-2825-6
G2 GRIDDLE
AT0E-3625-5
Control Board
SCHEMATIC,
AT2T-3912-1 Rev A
AT2E-1807-1
1 2 3 4 5 6
RED
BLU
GRN
IGNITION CONTOL MODULE
AT0E-2885-8
TEMPERATURE SENSOR
AT0E-2885-7
HI-LIMIT SENSOR
COM
8
3
N.O.
BLU
1 2 3 4 5
PRTD
1000O
1 2
GRY
ORN
1 2 3 4 5 6
BRN
1 2
VIO
WHT/BRN
WHT/GRAY
1
ISSP
J3
J7
J2
COM
RLY 2
DC COIL
2
4
N.O.
N.C.
N.C.
INPUT
SENSOR
DIGITAL
CONTROLLER
ON/
OFF
GND
+24V
INPUT
POWER
6
5
7
WHT
AT0A-2911-1
100 O
PRTD
HIGH LIMIT
BRN
CONTROLLER
AT0E-3880-1
HI-LIMIT CONTROL
L1 L2 N.C. N.O. COM *RTD* RESET
BRN
BRN
TEMP
VIO
YEL
WHT/BRN
REDRED
123
YEL
AT0E-2500-3
TIME DELAY RELAY
TIMER
GRN
FAULT
BLU
COM
24V
120V
240V
OVER
RED
HEAT
YEL
YEL
AT0E-1800-2
PILOT LAMP, RED
BLU
IGN FAULT
WHT
BLK
WHT
RED
208V
ORN
AT0A-2779-5
TRANSFORMER ASSEMBLY
BLK
2
1
.75 A
F2
.75 A
WHT BLK
F1
Accu-Steam™ G2 Gas Service Manual
SP8042-1609
VIO
YEL
GRN
1
2
3
4
J1
PAGE 25
Page 26
LIMITED WARRANTY
One Year Parts and LaborOne Year Parts and Labor
AccuTemp Products, Inc. ( AccuTemp ) warrants that your AccuTemp equipment will be free of defects in
material and workmanship under normal use for a period of twelve (12) months from installation or fi fteen (15)
months from date of shipment from AccuTemp, whichever date fi rst occurs (the Warranty Period ). Registration
of AccuTemp equipment is required at time
of installation.
Damage to AccuTemp equipment that occurs during shipment must be reported to the carrier, and is not
covered under this warranty. The reporting of any damage during shipment is the sole responsibility of the
commercial purchaser/user of such AccuTemp equipment.
AccuTemp provides an active service department, which should be contacted and advised of service issues
regardless of warranty period.
During the warranty period, AccuTemp agrees to repair or replace, at its option, F.O.B. factory, any part which
proves to be defective due to defects in material or workmanship, provided the equipment has not been altered
in any way and has been properly installed, maintained, and operated in accordance with the instructions in the
AccuTemp Owners Manual.
During the warranty period, AccuTemp also agrees to pay for any factory authorized equipment service agency
(within the continental United States and Canada) for reasonable labor required to repair or replace, at our
option, F.O.B. factory, any part which proves to be defective due to defects in materials or workmanship,
provided the service agency has received advance approval from AccuTemp factory service to perform the
repair or replacement. This warranty includes travel time not to exceed two hours and mileage not to exceed
50 miles (100 miles round trip), but does not include post start-up assistance or training, tightening of loose
fi ttings or external electrical connections, minor adjustments, gaskets, maintenance, or cleaning. AccuTemp will
not reimburse the expense of labor required to replace parts after the expiration of the warranty period.
Proper installation is the responsibility of the dealer, owner-user, or installing contractor and is not covered
by this warranty. While AccuTemp products are built to comply with applicable standards for manufacturers,
including Underwriters Laboratories (UL) and National Sanitation Foundation (NSF), it is the responsibility of
the owner and the installer to comply with any applicable local codes that may exist.
AccuTemp makes no other warranties or guarantees, whether expressed or implied, including any warranties
of performance, merchantability, or fi tness for any particular purpose. AccuTemp s liability on any claim of any
kind, including negligence, with respect to the goods and services covered hereunder, shall in no case exceed
the price of the goods and services, or parts thereof, which gives rise to the claim. In no event shall AccuTemp
be liable for special, incidental, or consequential damages, or damages in the nature of penalties.
This constitutes the entire warranty, which supersedes and excludes all other warranties, whether written, oral,
or implied.
Product Warranty
IMPORTANT
Improper installation can affect your warranty. Installation is the responsibility of the Dealer, Owner/
User or the Installation Contractor. See: Section One, Installation of the Owner s Manual.
For Service Call 800-480-0415 or email: service@accutemp.net
U.S. & Canada Sales Only
Accu-Steam™ G2 Gas Service Manual
PAGE 26
SP8042-1609
Page 27
NOTES
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Accu-Steam™ G2 Gas Service Manual
SP8042-1609
PAGE 27
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