AccuTemp GGX1201A24 Service Manual
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
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
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
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
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
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
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
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.
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Accu-Steam™ G2 Gas Service Manual
SP8042-1609
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
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