Page 1
EVOLUTION
NATURAL GAS / PROPANE
SERVICE MANUAL
ACCUTEMP PRODUCTS INC
8415 N. CLINTON PARK DR ● FORT WAYNE, IN 46825 ● 800 480-0415 ● www.accutemp.net
SP8026-1201 Email: service@accutemp.net
Page 2
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 a GAS ODOR is DETECTED, SHUTDOWN all appliances at the Main Gas Shut-Off
Valve and contact the local Gas Company or Gas Supplier Service.
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.
SP8026-1201 i
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 important
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 -
CAUTION
Indicates a potentially hazardous situation;
which, if unchanged, will result in minor or
moderate injury.
HOT SURFACE
DANGEROUS
VOLTAGE
NOTE
Advises the reader of information or
instructions, vital to the operation or
maintenance of the equipment.
SP8026-1201 ii
EARTH GROUND
Page 4
SAFETY PRECAUTIONS
DANGER
ELECTRICAL SHOCK HAZARD WHILE WORKING ON
ENERGIZED EQUIPMENT.
Unplug equipment prior to removing any components effected by electricity.
FLAMMABLE GAS HAZARD WHILE WORKING ON GAS
EQUIPMENT.
Shut-Off the Supply Gas Valve to the equipment prior to removing any
components effected by supplied gas.
BURN HAZARD WHILE WORKING ON STEAM PRODUCING
EQUIPMENT.
When accessing the cooking chamber, be sure to always stand back while slowing
opening the door to allow the chamber to vent off the steam. Never reach into the cooking
chamber before it has completely vented off the steam.
Never reach into the cooking chamber or handle hot items without wearing the proper
heat protective gloves. Steam coming out of the holes on the right side of the cooking chamber
is invisible and can cause severe burns.
Water inside the steam chamber, creating steam, has a temperature of 212°F and will
cause burns if touched or spilled on the skin.
PERSONNEL INJURY HAZARD WHILE PICKING UP OR
MOVING HEAVY EQUIPMENT.
Always use 2 people and proper lifting techniques when picking-up, moving, or
ipping-over heavy equipment.
SLIP & FALL HAZARD WHILE WORKING ON WATER
HOLDING EQUIPMENT.
Keep the oor in front of the equipment clean and dry. If spills occur, clean them up
immediately to avoid potential injuries.
SP8026-1201 iii
Page 5
WARNING & CAUTION NOTES
WARNING
ONLY QUALIFIED SERVICE TECHNICIANS
SHOULD PERFORM MAINTENANCE ON
THIS EQUIPMENT.
CAUTION
DO NOT• use abrasive materials, such as wire brushes or metal scouring pads to
clean the Water Sensors.
DO NOT• use Aluminum Oxide Sandpaper to clean the Water Sensors or Ignitor/
Flame Sense Probes. It leaves a residue that will not allow Water Sensors to work
properly.
DO NOT• manually ll water above the Water Level Mark on the left side of steam
chamber above the High Limit Level Sensor.
SP8026-1201 iv
Page 6
TABLE OF CONTENTS
SAFETY
Important For Your Safety.......................................................................................................................................i
Warning Symbol Denitions..................................................................................................................................ii
Safety Precautions................................................................................................................................................iii
Warning & Caution Notes.....................................................................................................................................iv
T.O.C. & MANUAL HISTORY
Table of Contents...............................................................................................................................................v-vi
Revision Sheet........................................................................................................................................................1
NOTES
Operational Condition Notes.................................................................................................................................2
Troubleshooting Notes...........................................................................................................................................3
OPERATIONAL & COMPONENT INFORMATION
Purpose Reference of Main Component Chart...................................................................................................4-6
Additional Component Part Numbers....................................................................................................................6
Sequence of Operation........................................................................................................................................7-9
Modifying Control/Keypad Program Settings.....................................................................................................10
TROUBLESHOOTING
Troubleshooting Flow-Diagram...........................................................................................................................11
Flow-Diagram Reference Troubleshooting Chart..........................................................................................12-14
COMPONENT REMOVAL & INSTALLATION
Location of Electrical Components Picture Overview.........................................................................................15
Electrical Components Removal & Installation.............................................................................................16-20
Cord & Plug Assembly...............................................................................................................
Water Sensor Control Board.......................................................................................................
Water Sensors..............................................................................................................................
Transformer.................................................................................................................................
Temperature (RTD) Probe...........................................................................................................
Control/Keypad Board................................................................................................................
Overtemp Switch (ThermalLimit SW3)......................................................................................
Ignition Module...........................................................................................................................
Time-Delay Relays......................................................................................................................
Chamber Pressure Switch............................................................................................................
Control Relays.............................................................................................................................
Ignitor & Flame Sense Probe......................................................................................................
Door Switch................................................................................................................................
Fuses...........................................................................................................................................
16
16
16
17
17
17
18
18
18
19
19
19
20
20
SP8026-1201 v
Page 7
TABLE OF CONTENTS
COMPONENT REMOVAL & INSTALLATION (CON’T)
Location of Gas Components Picture Overview..................................................................................................21
Gas Components Removal & Installation......................................................................................................22-24
Power Burner Blower...................................................................................................................
Gas Control Valve.........................................................................................................................
Gas Enrichment Valve..................................................................................................................
Power Burner Blower Pressure Switch........................................................................................
Gas Orice...................................................................................................................................
Location of Gas Burner & Gas Burner Box Picture Overview............................................................................25
Gas Power Burner Removal & Installation......................................[2 PERSONS REQUIRED].......................26
Gas Power Burner Box Removal & Installation..............................[2 PERSONS REQUIRED]..................27-28
Heat Transfer Plate Location Picture Overview...................................................................................................29
Heat Transfer Plate Removal & Installation.....................................[2 PERSONS REQUIRED].................30-31
Heat Transfer Plate Installation Notes & Cautions..............................................................................................32
Miscellaneous Components Removal & Installation.....................................................................................33-34
Auto-Fill Valve............................................................................................................................
Overll (Reed) Switch..........................................................[2 PERSONS REQUIRED]..........
Float Ball (Magnetic)...................................................................................................................
Drain Ball-Valve...................................................................[2 PERSONS REQUIRED]...........
Drip Pan.......................................................................................................................................
Door Components Removal & Installation....................................................................................................35-37
Door Assembly..............................................................................................................................
Inner Door Panel...........................................................................................................................
Door Handle Latch Assembly......................................................................................................
Door Hinge...................................................................................................................................
Door Gasket..................................................................................................................................
22
22
23
23
24
33
33
34
34
34
35
35
36
36
37
SCHEMATIC & CHARTS
Electrical Schematic AT1T-3736 Rev G (S/N 36980 and Below).......................................................................38
Electrical Schematic AT1T-3736 Rev H (S/N 36981 and Above).......................................................................39
Gas Orice Size to Altitude Chart.......................................................................................................................40
Ignitor/Flame Sense Probe Spacing Measurements.............................................................................................41
SP8026-1201 vi
Page 8
REVISION SHEET
Current Revision: 1201 Prior Revision: N/A
Date: 1/31/12 Date: N/A
Change:
Initial Release.
SP8026-1201 Pg 1
Page 9
OPERATIONAL CONDITION NOTES
OPERATIONAL CONDITION NOTES
The Water Column (WC) value for the gas pressure being supplied to the steamer •
should be between: Natural Gas = 7” to 10” WC Propane Gas = 11” to 13” WC.
If the supplied gas pressure coming into the steamer is .5 PSI (13.8” WC) or •
higher; an External Gas Regulator is needed in-line, prior to entering the steamer.
If an External Regulator is required, it must be rated at 125% of the BTU/hr rating or
higher.
The micro-Amp (µA) value for the Flame Sense Probe (to ignite the Burner Gas) •
must be at a minimum value of 2.5 µA . (Ignition Module pins FC+ & FC-.) The
Ignition Module will shutdown if value is below .07µA.
AUTO-FILL STEAMER• : The water pressure being supplied to the Auto-Fill Valve
should not be greater than 60 psi.
Measuring Gas Pressure Setup
Manometer
SP8026-1201 Pg 2
Page 10
TROUBLESHOOTING NOTES
TROUBLESHOOTING NOTES
If the steamer’s gas burner is not igniting, ensure that you have veried and recorded
the following, prior to calling the AccuTemp Service hotline:
With the Gas Burner operating, the Water Column (WC) value of the gas pressure from the •
steamer’s Gas Control Valve is 5” WC = Natural Gas or 10” WC = Propane Gas.
The micro-Amp (µA) value of the Flame Sense Probe (Ignition Module pins FC+ & FC-) should •
have a minimum value of 2.5 µA .
If the steamer is not reaching temperature:
Ensure that the steamer is not in the HOLD Mode verses the COOK Mode. The default mode for •
the steamer, when the PWR button is turned ON, is COOK. So, if the operator presses the Timer
Button then the Cook/Hold button; the operator has just placed the steamer in the HOLD Mode
and the steamer will not reach 212°F (COOK Mode).
Ensure that the steam vent (located on the back of the steamer) is • not blocked or clogged. If the
customer has added an extended exhaust pipe, there’s an increased chance of vent blockage, if
the exhaust pipe is not installed properly. The exhaust pipe should be made of copper, galvanized
or stainless steel. The exhaust pipe should have a diameter of 3/4”; and be sloped 1/4” for every
12” of length (recommend a height no greater than 24”). Also, the addition of extra ttings that
can alter the gravitational ow of the steam condensation, can cause blockage. If vent blockage
does occur, it will cause the chamber pressure switch to stay open; which prevents the heater from
turning back on; and the temperature will continue to drop. Blocked vent can additionally cause
steam to blow out of the door.
Auto-Fill Steamer: If the steamer is overlling with water and causing the steamer to
shut-off:
Ensure the steamer is • level, front to back and side to side. An un-level steamer can cause the
water in the steam chamber to collect in the front of the steamer, causing the Over-Fill Float Ball
to raise and trip the Reed Switch prematurely (every time the steamer is turned ON). Once the
Reed Switch trips, it will cause an Over-Fill Light and Buzzer; while turning off the steamer and
preventing its usage.
Ensure that both of the Water Sensors are clean. Build-up of scale or crud will prevent the Water •
Sensors from providing the appropriate control signals to the Auto-Fill Valve, causing it to overll
with water.
Ensure that the water pressure being supplied to the Auto-Fill Valve should not be greater than •
60 psi. If water pressure is to high, then a larger volume of water will be added to the steam
chamber during the auto-ll cycle; causing the steamer to overll with water.
SP8026-1201 Pg 3
Page 11
PURPOSE REFERENCE OF MAIN COMPONENTS
Component Part # Purpose
Transformer
Overtemp Switch
(Thermal Limit
SW3)
Control / Keypad
Board
Water Sensor
Control Board
Assembly Part#
AT0A-2779-3
AT1E-2653-4
AT0E-3625-1
AT0E-3230-2
Steps-down the Supply Line Voltage to 24 -28VAC.•
Normally closed switch that provides a safety feature to the machine •
in case the Gas Heater overheats.
If the Gas Heater • overheats, the switch will open and turn the steamer
off; while lighting the red LED Overtemp Light on the Control Panel.
The steamer will • not turn on until the temperature has dropped
enough to allow the Overtemp Switch to close again.
Human interface for steamer operations through push-buttons, •
operations, & display readouts.
Provides power to Control Relay #2 (24VDC).•
Receives input from the Temperature (RTD) Sensor and displays the •
water temperature on the LED readout.
Maintains the preset HOLD temperature.•
Receives inputs from Water Sensor Probes and implements •
corresponding actions for those inputs based on the water level in the
steam chamber.
Controls the Auto-Fill Valve (• if installed) and receives inputs that
provides actions for the desired water level needs.
Water Sensor
Probe
Low Water Level
Probe
High Limit
Water Level
Probe
Auto-Fill Valve
(OPTIONAL)
AT1E-2652-1
AT1A-3841-1
Teon exterior with a stainless steel center that uses the minerals in •
the water to complete the electrical circuit to the Water Board.
MUST BE CLEAN TO WORK PROPERLY.•
Once the Low Water Sensor is satised, it will allow the Ignition •
Module to activate.
If the water level is below the sensor, the Water Board will activate •
the Auto-Fill Valve (if installed) lling the unit the water until the
High Limit Water Sensor is satised.
On initial chamber water ll, once the water level reaches and •
satises the Operational Water Sensor, the Water Board will keep the
Auto-Fill Valve open for 30 additional seconds..
After initial chamber water ll, when the water level drops below the •
sensor’s operational level; the Water Board will open the Auto-Fill
Valve for 30 seconds to raise the water level back above the High
Limit Water Sensor.
This process will repeat as long as the water level stays above the •
Low Water Sensor.
Solenoid Valve that allows water to ow into the steam chamber; that •
is controlled automatically by the Water Board based on inputs from
the Water Sensor Probes.
SP8026-1201 Pg 4
Page 12
PURPOSE REFERENCE OF MAIN COMPONENTS
Component Part # Purpose
Reed Switch:
Water Over-Fill
Sensor Switch
(OPTIONAL)
Control Relay #1
(AC)
Door Switch AT0A-3660-1
Chamber
Pressure Switch
Time Delay
Relay #1
AT0A-3519-3
Float Ball:
AT0P-3233-1
AT0E-2825-5
S#: 34769 & Up
AT0E-3617-2
S#: 34768 & Lower
AT1A-3847
AT0E-2500-1
Magnetic Reed Switch is used in conjunction with a Float Ball. If the •
water rises too high, the switch opens and turns off the steamer.
When the switch opens, the High Water Overll LED will light. The •
user will have to drain the water out and turn the steamer back ON;
otherwise, the steamer will remain shutdown.
Controls AC Volt input & output signals which provide actions from •
the Water Sensor Board and Auto-Fill Valve (if installed).
Magnetic Switch used to ensure that the door is closed and latched •
prior to generating steam
Ignition Module will • not activate if this switch is not closed (Door
Open).
Normally closed switch that allows pressure to build-up inside the •
steam chamber.
Opens when the steam chamber pressure reaches 1/2 PSI.•
Ignition Module will • not activate if this switch is not closed (Switch
Open).
Normally open switch that closes after 5 seconds (once Door Switch •
& Chamber Pressure Switch are closed) to allow the Ignition Module
to activate and light the Gas Burner.
Control Relay #2
(DC)
Power Burner
Blower
Blower Pressure
Switch
Ignition Module AT0E-3760-1
Ignitor Probe
Flame Sense
Probe
AT0E-2825-6
AT0E-3759-1
AT0E-3617-3
Assembly Part#
AT1E-3795-1
Receives 24VDC (if the safety conditions are met) to the coil •
allowing the Ignition Module to activate the Power Burner Blower.
Provides the correct amount of air into the Gas Burner Box to allow •
the gas from the Gas Burner to ignite and burn efciently.
Closes once air pressure from the Power Burner Fan is applied.•
Ignition Module will • not activate if the switch is not closed (Switch
is Open due to no air from the Blower or the switch is defective).
Receives inputs and provides control signals to the Gas Control Valve •
and Gas Enrichment Valve.
Provides the voltage to the Ignitor Probe to ignite the gas from the •
Gas Power Burner.
Senses the input from the Flame Sense Probe (if there is a ame from •
the Burner or not) and makes appropriate control signal outputs based
if there is a ame from the burner or not.
Uses high voltage, supplied by the Ignition Module, to form a spark •
between the Ignitor Probe and the GND Probe.
Ignites the gas/air mixture from the Gas Power Burner.•
Veries that a ame is present and if no ame is sensed; the Ignition •
Module will go into lockout and deactivates all gas valves.
SP8026-1201 Pg 5
Page 13
PURPOSE REFERENCE OF MAIN COMPONENTS
Component Part # Purpose
Time Delay
Relay #2
Gas Enrichment
Valve
Gas Control
Valve
Gas Orice
Gas Power
Burner
Gas Power
Burner Box
AT0E-2500-2
AT0P-3818-1
Natural Gas:
AT2E-1806-2
Propane Gas:
AT2E-1806-3
Natural Gas:
AT0B-3758-1
Propane Gas:
AT0B-3758-2
AT1A-3768-1
AT1A-3769-1
Closes for 4 seconds, on initial start-up, to allow the Gas Enrichment •
Valve to open; providing a high concentration of gas to help ignite
poor quality gas on cold start-ups.
Used to provide a richer concentration of gas to the Burner on cold •
start-ups. Helps to compensate for poor quality supplied gas.
Controlled by Time Delay Relay #2 and the Ignition Module.•
Controls and maintains a constant ow of gas to the Gas Power •
Burner.
Controlled by the inputs from the Ignition Module.•
Provides the correct ratio of gas volume and pressure to the burner via •
a preset diameter hole size.
Orice Size for • NG: .1360 & for PG: .0935
Dispenses the mixture of gas and air evenly over its surface to •
provide maximum ame and heat dispersal efciency.
Chamber that positions the Burner and contains the ue gasses •
produced from the bunrer’s ame.
Temperature
(RTD)
Sensor
Door Assembly AT1A-3600-1
Drain Valve AT1P-2239-1
AT0E-3626-1
ADDITIONAL COMPONENT PART NUMBERS
Component Part # Component Part #
Pilot Lamp, 24V Red AT0E-1800-2 Inner Door Assembly AT1A-3647-1
Fuse, Slo-Blo 3A AT0E-2731-1 Door Hinge (Pair) AT1H-2058-3
Ignition Cable AT0E-3810-1 Door Latch Assy, Ceramic Magnet AT1H-3609-1
Provides temperature input to Control/Keypad Board, which displays •
the temperature in the steam chamber based on resistance changes
from the Temperature (RTD) Sensor.
Used to maintain the preset HOLD mode temperature.•
Keeps the steam trapped inside the steam chamber to allow pressure •
to build and cycle the Chamber Pressure Switch.
Manually Open/Close valve used to drain water from the steam •
chamber.
Gasket, Door AT1G-2633-1 Door Latch Mounting Plate AT1M-3046-1
SP8026-1201 Pg 6
Page 14
SEQUENCE OF OPERATION
MANUAL FILL:
Power Cord Plugged-In & PWR Button Not Pushed
Line Voltage (120/240VAC) comes in through the Terminal Strip and 3A fuse until it reaches •
the Transformer.
Line Voltage is also applied to the Ignition Module on pin L1, after it goes through the 3A •
fuse.
The Transformer steps-down the Line Voltage to 24VAC and applies that, through the •
Overtemp Switch & Overll Reed Switch (Auto-Fill Only), to the Water Sensor Board, the
Control/Keypad Board, and Ignition Module on pin V2.
(The red LED light on the Water Sensor Board will be ashing at a rapid rate.)•
The AC coil of Control Relay #1 (CR#1) is energized.•
PWR Button Pushed & Water Level Is Below the Low Water Level Sensor
PWR Button pushed and the Low Water Light Indicator will be ON and Alarm will sound.•
(The red LED light on the Water Sensor Board will continue to ash at a rapid rate.)•
PRE• is displayed on the Control/Keypad Board.
PWR Button Pushed & Water Is Filled to the Water Level Mark
PWR Button pushed and the Low Water Light Indicator will be OFF and no Alarm will •
sound, due to the Low Water Level Sensor being satised. (The red LED light on the Water
Sensor Board will have a 1 second ash rate.)
Low Water Sensor’s signal will close the Water Sensor Control Board’s K2 Relay, which will •
turn-off the Low Water Light and send a power signal to pin 5 of Control Relay #2 (CR#2),
pin 24VAC of the Ignition Module, and the Gas Control Pilot Valve.
The Control/Keypad Board will send a 24VDC signal to Control Relay #2 closing the DC •
coil (as long as the Door Switch and the Chamber Pressure Switch is closed; allowing the
Time Delay Relay #1 to close after a 5 second delay, which will create a buffer for power to
the DC coil).
Control Relay #2’s DC coil is closed, allowing the power signal from K2 Relay to pass from •
pin 5 to pin 3 of Control Relay #2; sending power to the Ignition Module on pin TH.
(If the Gas Power Burner • does not ignite, the Ignition Module will look-out; and the steamer will have to be turned OFF and back ON to get the steamer to try and re-light the Gas
Power Burner.)
SP8026-1201 Pg 7
Page 15
SEQUENCE OF OPERATION
MANUAL & AUTO-FILL:
Ignition Module
Power signal to the Ignition Module’s pin TH, activating the Power Burner Fan from pin •
IND on the Ignition Module.
Air pressure from the Power Burner Blower will close the Power Burner Blower Pressure •
Switch, supplying power to pin PSW.
Ignition Module will send control signals from pin V1 to the Time Delay Relay #2, and to •
the Gas Control Main Valve. At the same time, Ignition Voltage is sent to the Ignitor Probe
creating a spark between the probe and GND.
The Time Delay Relay #2 operates for 4 seconds, allowing the Gas Enrichment Valve to •
supply a dense amount of gas (compensation for poor quality source gas), in conjunction
with the Gas Control Valve’ gas.
The Ignition Module will look for a signal from the Flame Sense Probe, via pin S1, to •
indicate taht the gas was lit and burning a ame. If no ame is sensed within 4 seconds of
ignition start, then the Ignition Module will lockout and prevent the steamer from operating.
Gas Power Burner & Heat Transfer
When the Gas Enrichment and Gas Control Valves are opened, gas is sent through the Gas •
Orice and mixed with air from the Power Burner Fan; then it is distributed through the Gas
Burner’s surface ports to be ignited by the Ignitor Probe’s spark.
Flame Sense signal will cause the Ignition Module to keep the Gas Control Valve open, •
supplying gas to the burner. (The ame should be a blue color for maximum efciency.)
The heat generated in the Gas Burner Box will be transferred, by the Heat Transfer Plate, •
evenly over the bottom of the steam chamber; boiling the water inside to create steam for
cooking.
Temperature Sensor (RTD) and Control/Keypad Board
As the temperature rises in the steam chamber, the RTD will provide a signal, based on the •
resistance of heat variance, to the Control/Keypad Board to provide a digital Temp Display.
Control Panel will show • PRE on initial heat-up until the steam chamber reaches 195°F; then
COO will be display between 195°F and 212°F.
The operating default mode on initial power ON is COOK mode; which causes the steamer •
to go to the operating temperature of 212°F.
In HOLD mode; the steamer’s temperature is displayed on the Control Panel until the HOLD •
temperature’s preset value is reached; then HLD is displayed. The Control/Keypad Board
will regulate temperature via the RTD input, based on that HOLD preset value. (This value
can be changed using the program function on the Control/Keyboard Control.)
SP8026-1201 Pg 8
Page 16
SEQUENCE OF OPERATION
AUTO-FILL (OPTIONAL):
Power Cord Plugged-In & PWR Button Not Pushed
Same as Manual Fill.•
PWR Button Pushed & Water Level Is Below the Low Water Level Sensor
PWR Button pushed and the Low Water Light Indicator will be lit.•
(The red LED light on the Water Sensor Board will be ashing at a rapid rate.)•
The Water Sensor Board sends a signal to the Water Sensor Board’s K1 Relay to open the •
Auto-Fill Valve and start lling the steam chamber with water.
(This process will continue every time the water level falls below the Low Water Level •
Sensor.)
PWR Button Pushed & Water Level Is At the Low Water Level Sensor or Above
Same as Manual Fill.•
Water Level Is At the High Limit Water Level Sensor
When the water level reaches the High Limit Water Level Sensor, the Water Sensor Board •
will continue to activate the Auto-Fill Valve for 30 seconds then turn it off.
(The red LED light on the Water Sensor Board will have a 2 second ash rate.)•
This process will continue every time the water level falls below the High Limit Water Level •
Sensor.
Water Level Is Filled Too High in the Steam Chamber
When the water level gets to high in the steam chamber, the Float Ball will rise on the Reed •
Switch sensor peg until the Reed Switch does not read the magnetic eld from the Float Ball.
This will cause the Control Relay #1 AC coil’s voltage to drop, dis-engaging the relay from •
the steamer’s normal operation; and also lighting the High Water (Over-Fill) Indicator Lamp
on the Control Panel.
Loss of Control Relay #1 cause the loss of the control signal to pin 5 of Control Relay #2; •
causing it to turn off the Ignition Module and close the Gas Control Valve which stops the
gas feed to the Gas Power Burner.
(To restart the steamer, drain the water out until the High Water (Over-Fill) Indicator Light •
turns-off. Pressing the PWR button ON will begin the start-up procedure.)
SP8026-1201 Pg 9
Page 17
MODIFYING CONTROL / KEYPAD PROGRAM SETTINGS
Hrs/Min/Sec
LED Lights
UP Arrow
DOWN Arrow
S1 - Increase Program Item (Will cycle the Hrs/Min/Sec LED light)
S4 - Decrease Program Item (Will cycle the Hrs/Min/Sec LED light)
S3 - Increase Program Value (Will change the Digital Readout display)
S6 - Decrease Program Value (Will change the Digital Readout display)
S2 - Exit & Save
ENTERING PROGRAM MODE: Simultaneously, depress and hold S4 & S6 for minimum of 8 seconds or
until the Hrs LED blinks and the display shows a Hold Temp number (default is 180°F). Now the Controller
can operate under the Program Function Parameters.
S1
S4
POWER
S5
S2
TIMER
S3
S6
COOK/HOLD
TEMP Display
Program Mode Function Parameter Table
Hrs LED Min LED Sec LED PARAMETER MIN MAX GAS
Blink OFF OFF HOLD Temp Value = Degree F MIN Temp MAX Temp 180
ON OFF OFF Default Timer Value = Hours 0 8 0
OFF ON OFF Default Timer Value = Minutes 0 59 30
OFF OFF ON TEMP Probe Offset = Degree F 0 50 0
ON ON ON TEMP Probe Offset = Neg/Pos Diff NEG = 1 POS = 0 0
Blink Blink Blink Hysteresis
ON Blink Blink TEMP Regulating Mode
Blink ON Blink Proportioning BAND TIME 4 10 10
Blink Blink ON Proportioning BAND WIDTH 4 10 10
RESETTING CONTROLLER TO FACTORY DEFAULT VALUES ON THE GAS STEAMER
CAN CAUSE AN IGNITION MODULE CONTROL FAULT.
SP8026-1201 Pg 10
2 10
On/Off = 0 PID = 1
3
0
Page 18
START
TROUBLESHOOTING FLOW-DIAGRAM
POWER
ON
NO
Steamer
Plugged-In
YES
Breaker
ON
YES
Check
Internal
Power
Voltages
SEE C
Component
Voltages
Correct
YES
Call
AccuTemp
Service
NO
NO
NO
YES
SEE
SEE
SEE
A
B
D
Ball
WARNING
LIGHTS
YES
Control Panel
Error Code
NO
Low Water
Light
NO
Over Temp
Light
NO
High Water
(Over-Fill)
Light
YES
Float Ball
Installed
NO
Float Ball
Present
YES
YES
YES
YES
YES
NO
SEE
SEE
SEE
SEE
Ball
E
F
G
H
SEE
STEAMER
HEATING
YES
Temp
Low
NO
Steam Out
The Door
NO
Food Over
Cooked
NO
Food
Under
Cooked
YES
Different
Problem
With
Steamer
Operations
NO
YES
YES
YES
YES
NO
SEE
I
SEE
J
SEE
K
SEE
L
SEE
M
DONE
WITH
CHART
YES
Call
AccuTemp
Service
Call
AccuTemp
Service
NO
Call
AccuTemp
Service
(800) 480-0415 or service@accutemp.net
SP8026-1201 Pg 11
Page 19
FLOW-DIAGRAM REFERENCE TROUBLESHOOTING CHART
REF
LETTER
POSSIBLE CAUSE EVALUATION
A
B
C
D
E
F
G
H
Power Cord Disconnected
Breaker Is Tripped
Transformer
Fuses Check for blown fuses.
Over-Temp Switch
Control panel not responding.
Bad Component or Faulty Wiring
Error Code: -1F or -99F for
Temperature (RTD) Probe.
Low Water Sensor Not Satised
Steamer Has Over-Heated
Too Much Water In Steam Chamber
Operational Water Level Sensor Faulty
Conrm proper voltage is present at receptacle.
Plug-in Power Cord.
Unplug steamer and check line voltage at plug-in receptacle.
Reset Breaker.
Check for proper incoming line voltage to the primary side and
24VAC on the secondary side.
Check between the common wire, terminal # 6 on the Control
Relay #1 and the brown wire after the fuse.
Check for 24VAC incoming power at pins J2-1 & J2-2.
Check for out put at pins J7-3 & J7-4 (ON/OFF) = 24VAC
Check the wiring to the component; including wire-toconnectors, GND’s, and damage.
If a component output is bad, then it may need replaced.
Check for 1000 ohms (at room temp) on Control/Kepad Board on
J3 - Pins 1 & 2.
EC: -1F = Open Temp (RTD) sensor
EC: -99F = Shorted Temp (RTD) sensor
Ensure water level is above Low Water Sensor Probe inside the
steam chamber.
Ensure that the Low Water Sensor is cleaned and that the Water
Board is working properly.
Check that the water level inside steam chamber is not empty; and
rell if needed.
If an Auto-Fill unit, then ensure that water supply is not shut-off, or
Auto-Fill Valve is faulty.
Ensure Water Sensors are clean.
DO NOT OPEN DOOR!
Open Drain Valve until the High Water Light goes off. If light
DOES NOT go out and no water in steamer, then possibly a sensor
fault.
Ensure the top Water Sensor is clean.
Check that Water Board is working properly.
Ensure Float Ball is not stuck on the Sensor Post.
Float Ball & Reed Sensor Faulty
Control/Keypad Panel Check for 24VDC output (J7 Pins 1 & 2).
I
Door Switch Not Engaging
Chamber Pressure Switch
Ensure Sensor Post & inside of the Float ball are clean.
Check continuity of the Reed Switch (Float over sensor creates
continuity; the Float off the sensor is open.)
Ensure Door is shut and handle is latched.
Check the Door Switch for continuity with Door closed.
Check the butt splices and wire connection terminals for good
crimps.
Switch is normally closed.
Check the Chamber Pressure Switch for continuity.
SP8026-1201 Pg 12
Page 20
FLOW-DIAGRAM REFERENCE TROUBLESHOOTING CHART
REF
LETTER
I
POSSIBLE CAUSE EVALUATION
Time Delay Relay #1 (5 sec)
Control Relay #2
Blower Pressure Switch
Power Burner Blower
Ignition (Spark) Module
Ignition Probe & Cable
Gas Enrichment Valve
Relay is normally open.
Check for continuity during the rst 5 -10 seconds of pressing
PWR ON button.
Check for 24-30VDC at Pins 7 & 8 on the CR2 Coil.
Check for 24VAC on pin 3.
Ensure Relay Contacts are closing and not stuck open.
Switch is normally open.
Check that switch closes at .2” Water Column (WC) & that voltage
is present on Lt Blue wire to Ignition Module at pin PSW.
Check that the vent is set for:
3” for Natural Gas & 3” for Propane.
If vent is to large, then unit will not ignite.
Check the Red LED light on the module for the
following indications (listed on the module):
Constant = Control Fault (Turn unit OFF & back
ON, if LED goes out; then ignition module is OK.)
1 Flash = Air Vent Blockage / No Blower Pressure
2 Flashes = Flame with No Call For Heat
3 Flashes = Ignition Lookout (No Gas Present)
Check that the probes are not oxidized or broken.
Check that the Ignition Cable has a good connection to Ignition
Probe.
Verify that the Ignition Probes are in the correct position to the
Burner’s surface as required.
Check to ensure that the Time Delay Relay #2 is
opening the Gas Enrichment Valve for 4 seconds.
(Signal from Spark Module out of pin V1.)
Ensure that the valve is engaging.
Gas Valve Control
External Supply Gas Press. Regulator
Steam Vent Blocked
J
Steam Temperature Is Not At
Desired Cook Temperature
Check that the Gas Pressure is at the correct WC value:
5” for Natural Gas & 10” for Propane.
Verify that the incoming gas pressure from the External Regulator
is between WC values:
7” - 10” Natural Gas & 11” - 13” Propane.
Steam should be coming out of vent at back of steamer.
Check for blockage in the vent, which can cause the Chamber
Pressure Switch to open.
Ensure that there is at least a minimum of 1/4” slope for every foot
added, of extended exhaust piping.
Ensure that any extended exhaust piping is made of galvanized or
stainless steel, or copper; and a minimum of 3/4” in diameter.
If blockage is present, try to pour some hot water down the vent
piping to unclog the blockage (may have to blow out the blockage
if water doesn’t help).
Check that the Door is closed and no steam is escaping from it.
Verify that Low Water indicator light is not lit.
Check that steamer is in the COOK mode and NOT in the HOLD
mode.
SP8026-1201 Pg 13
Page 21
FLOW-DIAGRAM REFERENCE TROUBLESHOOTING CHART
REF
LETTER
J
K
L
M
POSSIBLE CAUSE EVALUATION
Steam Vent Blocked
Door Assembly
Pressure Switch
Steam Vent Blocked
Food Cook Time Too Long
Food Cook Time Not Long Enough
See Ref Letter I.
Check to see if the Door is seating completely around the face of
the Steamer.
Check that the Door Gasket does not have any cuts, nicks, debris,
or discolorations (white or grey).
Check that the Chamber Pressure Switch opens and closes
checking the Ohms reading while blowing into its input hose.
(Disconnect the hose from the chamber inlet hole.)
See Ref Letter I.
Ensure that the proper Cook Time is being used.
Refer to the Owners Manual for cooking tips if no mechanical
reason is found for this symptom.
See Ref Letter K.
Ensure that the steamer is in the COOK mode and not the HOLD
mode. (HOLD has a preset temp value that is below that of
212°F.)
Check that proper pan placement is being utilized for best cooking
conditions. (See Owners Manual)
Ensure that the Drain Ball-Valve is shut tightly or possible loss of
heating efciency.
Refer to the Owners Manual for cooking tips if no mechanical
reason is found for this symptom.
NOTE
If your symptoms are not listed in the Flow Chart and/or the REF Chart, then
additional troubleshooting may be required.
If you need additional ideas for troubleshooting or want to conrm your symptoms
with one of our Service Techs, please contact us by phone or e-mail listed below
with the unit’s S/N or Model information.
AccuTemp Service Dept. Phone (800) 480-0415
AccuTemp Service Dept. Email service@accutemp.net
SP8026-1201 Pg 14
Page 22
LOCATION OF ELECTRICAL COMPONENTS
Time-Delay
Relays
Control Relays
Door Close Switch
Water Sensor
Control Board
Control / Keypad
Board
Transformer
Fuses
1 Fuse = 120VAC
2 Fuses = 240VAC
Power Cord
Terminal Strip
Ignition Module
SP8026-1201 Pg 15
Ignitor / Flame Sense
Probe
Water Sensors
Page 23
ELECTRICAL COMPONENTS REMOVAL & INSTALLATION
CORD & PLUG ASSEMBLY
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the Power Cord Leads (Black, 3.
White, Red, and/or Green) from the Terminal
Strip.
On the inside of the unit, remove the retaining 4.
nut on the threads of the Power Cord Cable
Fitting & pullout the Power Cord.
Re-install in reverse order.5.
WATER SENSOR CONTROL BOARD
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires (note the wire color to its 3.
location pin).
Carefully4. , push in the locking leg on the 4
plastic posts while pulling the Water Board up
off the posts (note the board’s orientation).
Remove the Water Board.5.
Re-install in reverse order.6.
WATER SENSORS
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Open the door and 3. ensure that all the water is
drained from the steam chamber.
Disconnect the wire from the backside of the 4.
Water Sensor (access via left-side panel).
Remove the retaining nut that mounts the Water 5.
Sensor to the Steam Chamber.
Push the Water Sensor through the hole in the 6.
steam chamber from the backside.
Re-install in reverse order. 7. Torque Sensor
Nuts to between 12-15 In-Lbs.
SP8026-1201 Pg 16
Page 24
ELECTRICAL COMPONENTS REMOVAL & INSTALLATION
TRANSFORMER
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires (note the wire color to its 3.
location terminal).
Remove the 2 mounting nuts and then remove 4.
the Transformer.
Re-install in reverse order.5.
TEMPERATURE (RTD) SENSOR
Unplug the Unit.1.
Remove the Left-Side, Right-Side, and Top 2.
Panel by removing the Sheet Metal Screws
holding it in place.
Disconnect the probe wires from the Control/3.
Keypad Panel and pull them from the left, over
the top, to the steamer’s right-side (the wires
to the location pins are enter-changeable).
Remove the mounting nut and then remove the 4.
Temperature (RTD) Sensor.
Re-install in reverse order. 5. Ensure Thermal
Paste is applied to the Temperature (RTD)
Sensor.
CONTROL / KEYPAD BOARD
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires (note the wire color to its 3.
location terminal).
Remove the 7 mounting nuts and then remove 4.
the Control Panel CCA.
(5. If accessing the Program Mode is needed, go
to page 10 for more details.)
Re-install in reverse order.6.
SP8026-1201 Pg 17
Page 25
ELECTRICAL COMPONENTS REMOVAL & INSTALLATION
OVERTEMP SWITCH (THERM LIMIT SW3)
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires (note the wire color 3.
to its location pin).
Remove the 2 mounting screws and then 4.
remove the Overtemp Switch.
Re-install in reverse order.5.
IGNITION MODULE
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Remove the mounting nut on the Ignition 3.
Cable.
Disconnect the wires (note the wire color to its 4.
location pin).
Remove the 2 mounting screws and then 5.
remove the correct voltage type Control Relay.
Re-install in reverse order.6.
TIME-DELAY RELAYS
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires from the desired 3.
Time-Delay Relay (note the wire color to its
location pin).
Remove the mounting nut and then remove 4.
the desired Time-Delay Relay.
(5. Ensure the time-delay pot is set to the correct
delay time...TDR#1 = 5sec / TDR#2 = 4sec).
Re-install in reverse order.6.
TDR #2 (4sec)
SP8026-1201 Pg 18
TDR #1 (5sec)
Page 26
ELECTRICAL COMPONENTS REMOVAL & INSTALLATION
CHAMBER PRESSURE SWITCH
Unplug the Unit & remove the Left-Side Panel 1.
by removing the Sheet Metal Screws holding it
in place.
Disconnect the Wiring Terminals from the 2.
Chamber Pressure Switch (note the wire color
to its location terminal).
Remove the hose clamp and disconnect the 3.
hose from the Chamber Pressure Switch.
Remove the 2 mounting nuts holding the 4.
Chamber Pressure Switch to chamber cavity.
Remove the Chamber Pressure Switch5.
Re-install in reverse order.6.
CONTROL RELAYS
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires (note the wire color to its 3.
location pin).
Remove the 2 mounting screws and then 4.
remove the correct voltage type Control Relay.
Re-install in reverse order.5.
IGNITOR & FLAME SENSE PROBE
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the wires from the probes (note the 3.
wire to its probe location).
Remove the 2 mounting bolts and then remove 4.
the Probe Assembly.
Re-install in reverse order. 5. Ensure that the
GND Probe is angled towards the Burner’s
Surface.
AC Relay
CR1
DC Relay
CR2
Ignition
Probe
Flame
Sense
Probe
Ignition
Probe
SP8026-1201 Pg 19
Page 27
ELECTRICAL COMPONENTS REMOVAL & INSTALLATION
DOOR SWITCH
Door Latch on the Left-Hand Side
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Disconnect the probe wires: Control/Keypad 3.
Panel J7 Pin 1 & the White/Brown wire from
the Chamber Pressure Switch (the wires to the
location pins are enter-changeable).
Push back the insulation, so you can access the 4.
other mounting nut to be removed.
Remove the 2 mounting nuts and then remove 5.
the Door Switch. Fg 1
Re-install in reverse order.6.
Door Latch on the Right-Hand Side
Unplug the Unit.1.
Remove the Left-Side, Right-Side, and Top 2.
Panel by removing the Sheet Metal Screws
holding it in place.
Disconnect the probe wires: Control/Keypad 3.
Panel J7 Pin 1 & the White/Brown wire from
the Chamber Pressure Switch; and pull the
wires up, over the top of the steamer (the wires
to the location pins are enter-changeable).
Remove the insulation on the right side, to 4.
access the Door Switch to be removed. Fg 2
Remove the 2 mounting nuts and then remove 5.
the Door Switch. Fg 3
Re-install in reverse order.6.
Fg 1
Fg 2
Fg 3
FUSES
Unplug the Unit.1.
Remove the Left-Side Panel by removing the 2.
Sheet Metal Screws holding it in place.
Pry the Fuse(s) out of the Fuse Block with 3.
a at-head screwdriver or fuse puller.
1 Fuse = 120VAC & 2 Fuses = 240VAC
Re-install in reverse order.4.
SP8026-1201 Pg 20
Page 28
LOCATION OF GAS COMPONENTS
Chamber Pressure
Switch
Gas Control
Valve
Gas Orice
Gas Enrichment
Power Burner
Blower
Power Burner
Blower
Pressure
Switch
Ignition Module
Valve
SP8026-1201 Pg 21
Page 29
GAS COMPONENTS REMOVAL & INSTALLATION
POWER BURNER BLOWER
Unplug the Unit & remove the Left-Side Panel 1.
by removing the Sheet Metal Screws holding it
in place.
Disconnect the Wiring Terminals from the Fan 2.
(note wire color location to the Fan’s wires).
Disconnect the Blower Pressure Switch Hose 3.
from the bottom of the Power Burner Blower.
Remove the 4 mounting nuts at Blower base.4.
Remove the Power Burner Blower.5.
Re-install in reverse order. 6.
Ensure the Blower’s Air Shutter is set as
follows: Natural = 3” & Propane = 3”
Fan Pressure Switch Hose
GAS CONTROL VALVE
Shut OFF the Supply Gas Valve & disconnect 1.
the Supply Gas Hose.
Unplug the Unit & remove the Left-Side Panel. 2.
Disconnect the Gas Line from the Enrichment 3.
Valve to the Burner. Fig A
Disconnect the Wiring Terminals from the Gas 4.
& Enrichment Valves (note wire color location
to each valve’s wires).
Disconnect the Union Coupler on the output 5.
(right-hand) side of the unit’s Gas Valve.
Loosen the Retaining Bracket of the Inlet Gas 6.
Pipe (left side of Gas Control Valve). Fig B
Disconnect the Gas Control Valve’s Inlet Gas 7.
Pipe.
Remove the Gas Orice & Gas Union Coupler.8.
Remove the Gas Enrichment Valve.9.
Re-install in reverse order. 10. Ensure Sealant
is re-applied to all pipe threading.
Fig B
Fig A
Union CouplerInlet Gas Pipe
After Replacing Gas Valves, it is Mandatory to Check
and Verify that the Gas Valve has the Proper Water
Column (WC) Value Measured with a Manometer.
Also Conrm No Gas Leaks Are Present.
SP8026-1201 Pg 22
Page 30
GAS COMPONENTS REMOVAL & INSTALLATION
GAS ENRICHMENT VALVE
Shut OFF the Supply Gas Valve & disconnect 1.
the Supply Gas Hose.
Unplug the Unit & remove the Left-Side Panel 2.
by removing the Sheet Metal Screws holding it
in place.
Disconnect the Gas Line from the Enrichment 3.
Valve to the Burner. Fig A
Disconnect the Wiring Terminals from the 4.
Enrichment Valve (note wire color location to
the valve’s wires).
Disconnect and remove the Enrichment Valve 5.
from under the unit’s Gas Control Valve.
Remove the 906. ° elbow.
Remove the MOV Wires (7. note their location on
the Enrichment Valve).
Re-install in reverse order. 8. Ensure Sealant
is re-applied to all pipe threading.
After Replacing Gas Enrichment Valve, it is
Mandatory to Check and Verify that the
Gas Valve has the Proper Water Column
(WC) Value Measured with a Manometer.
Also Conrm No Gas Leaks Are Present.
POWER BURNER BLOWER PRESSURE SWITCH
Unplug the Unit & remove the Left-Side Panel 1.
by removing the Sheet Metal Screws holding it in
place.
Disconnect the Wiring Terminals from the Power 2.
Burner Blower Pressure Switch (note wire color
location to the switch’s wires).
Remove the hose clamp and disconnect the hose to 3.
the Power Burner Blower Pressure Switch.
Remove the 2 mounting screws on the Power 4.
Burner Blower Pressure Switch mounting bracket.
Remove the 3 screws holding the Power Burner 5.
Blower Pressure Switch to the mounting bracket.
Remove the Power Burner Blower Pressure Switch.6.
Re-install in reverse order.7.
SP8026-1201 Pg 23
Page 31
GAS COMPONENTS REMOVAL & INSTALLATION
GAS ORIFICES
Shut OFF the Supply Gas Valve & disconnect 1.
the Supply Gas Hose.
Unplug the Unit & remove the Left-Side Panel.2.
Disconnect the Gas Union Coupler on the 3.
output (right) side of the Gas Control Valve.
Loosen the Retaining Bracket of the Inlet Gas 4.
Pipe (left side of Gas Control Valve). Fig B
Remove the Gas Union Coupler Fitting from 5.
the Gas Orice.
Remove6. the Gas Orice from the Gas Control
Valve.
Disconnect the Burner Union Coupler below 7.
the Ignition Module. Fig C
Pull-out the Ignition Module Bracket and 8.
angle it to allow access to the end of the Gas
Enrichment Valve Hose, attached to the piping
behind the Ignition Module Bracket. Fig D
Detach the Gas Enrichment Hose tting to 9.
allow access to the Gas Enrichment Orice.
Remove10. the Gas Enrichment Orice from the
Gas Enrichment Hose tting. Fig E
Re-install in reverse order. 11. Ensure Sealant
is re-applied to all pipe threading.
Union CouplerGas Orice
Fig C
Burner Union Coupler
Fig D
Fig E
Gas
Enrichment
Hose End
Fitting
USE THE GAS ORIFICE PER
ALTITUDE CHART, ON PAGE 40, TO
ENSURE THE PROPER ORIFICE
SIZES IS USED.
SP8026-1201 Pg 24
After Replacing Gas Orices, it is
Mandatory to Check and Verify that the
Gas Valve has the Proper Water Column
(WC) Value Measured with a Manometer.
Also Conrm No Gas Leaks Are Present.
Page 32
LOCATION OF GAS BURNER & GAS BURNER BOX
Ignition Probe Assembly Gas Power Burner Cover
Burner Gas
View Window
Gas Power Burner
Union Elbow
Gas Burner Box
SP8026-1201 Pg 25
Page 33
GAS POWER BURNER REMOVAL & INSTALLATION
GAS POWER BURNER
Shut OFF the Supply Gas Valve & disconnect 1.
the Supply Gas Hose & Unplug the unit.
Turn the unit upside-down and remove its legs. 2.
(Unbolt from stand and then turn unit upside-
down if applicable.)
Remove Left-Side Panel & Bottom Cover. 3.
(Remove Drain Pan Rails if applicable.)
Remove the Ignition Probe Sensor Bracket’s 4.
2 screws. (Note the orientation of the Ignition
Probe in ref to the Gas Burner Union Coupler.)
Remove the Insulation as needed to provide 5.
access to remove the Gas Burner from its Gas
Burner Box. (Note the insulation location for
proper tting when re-installed.)
Disconnect the Gas Burner Union Coupler.6.
Remove the 2 mounting screws from Gas 7.
Burner’s support bracket.
Remove the Gas Power Burner by sliding it out 8.
of the Gas Burner Box.
Re-install in reverse order.9.
Ignition Probe Bracket
Burner Union Coupler
After Replacing Gas Burner, it is Mandatory to Check
and Verify that the Gas Valve has the Proper Water
Column (WC) Value Measured with a Manometer.
Also Conrm No Gas Leaks Are Present.
Gas Burner Cover
SP8026-1201 Pg 26
Page 34
GAS POWER BURNER BOX REMOVAL & INSTALLATION
Bottom Cross-BraceGas Burner Box Bottom
Front
Of
Steamer
Gas Burner
GAS POWER BURNER BOX
Shut OFF the Supply Gas Valve & disconnect 1.
the Supply Gas Hose & Unplug the unit.
Turn the unit upside-down and remove its legs. 2.
(Unbolt from stand and then turn unit upside-
down if applicable.)
Remove Left-Side Panel & Bottom Cover by 3.
removing the Sheet Metal Screws holding it in
place. (Remove Drain Pan Rails if applicable.)
Fig F
Remove the Ignition Probe Sensor Bracket’s 4.
2 screws. (Note the orientation of the Ignition
Probe in ref to the Gas Burner Union Coupler.)
Remove the Insulation as needed to provide 5.
access to remove the Gas Burner Box. (Note
the insulation location for proper tting when
re-installed.) Fig G
Disconnect the Burner Union Coupler.6.
Remove the 2 mounting screws from Gas 7.
Burner’s support bracket.
Remove the Gas Burner by sliding it out of the 8.
Gas Burner Box.
Fig F
Fig G
SP8026-1201 Pg 27
Page 35
GAS POWER BURNER BOX REMOVAL & INSTALLATION
Burner Box
Burner
GAS POWER BURNER BOX (CON’T)
9. Unscrew the PWR Cord retaining tting on the
Back Panel and pull some slack through the
tting, to allow for some room to remove the
Back Panel.
10. Unscrew the Back Panel’s sheet metal screws
and remove the Back Panel.
11. Remove the 2 bottom structural cross-braces.
12. Remove the mounting nuts on the Flue and the
Burner Box.
13. Remove the Exhaust Flue off the Gas Burner
Box. Fig H
14. Lift and remove the Burner Box. (Might have
to use a at-head screwdriver to pry up the Gas
Burner Box from the Gas Burner Gasket.)
15. Re-install in reverse order.
Flue Exit
Flue
Side
Points
To
The
Back
Thermal
Gasket
Of
The
Steamer
Prior to installing the new Burner Box:
Scrap, remove, and clean-off any •
remaining Gas Burner Gasket residue
from the steamer’s bottom (where the
mounting studs are located).
Apply the 3 new Gas Burner Gaskets •
to the Bottom of the Gas Burner Box.
Side Gaskets = AT1I-3771-4 (Need 2)
Front Gasket = AT1I-37771-3
Fig H
After Replacing Burner Box, it is Mandatory to Check
and Verify that the Gas Valve has the Proper Water
Column (WC) Value Measured with a Manometer.
Also Conrm No Gas Leaks Are Present.
SP8026-1201 Pg 28
Page 36
LOCATION OF HEAT TRANSFER PLATE
NOTE
The Zinc Flat Washer, Lock Washer, and 1/4-20# Nut Can Only Be Used Once.
Ensure That New Zinc Hardware is Ordered (Minimum of 24 Each Required) and
Received; Prior to Removing or Installing the Heater Transfer Plate.
Zinc 1/4-20# Nut = AT0F-2778-51002
Zinc 1/4” Flat Washer = AT0F-1052-51002
Zinc 1/4” Lock Washer = AT0F-2666-51002
Heat Transfer Plate
NOTE
Ensure That Thermal Joint Compound is Ordered (Minimum Of 2 Required) and
Received, Prior to Removing or Installing the Heater Transfer Plate.
Thermal Joint Compound = AT0H-3412-2
SP8026-1201 Pg 29
Page 37
HEAT TRANSFER PLATE REMOVAL & INSTALLATION
HEAT TRANSFER PLATE
Shut OFF the Supply Gas Valve & disconnect 1.
the Supply Gas Hose & Unplug the unit.
Turn the unit upside-down and remove its legs. 2.
(Unbolt from stand and then turn unit upside-
down if applicable.)
Remove Left-Side Panel & Bottom Cover by 3.
removing the Sheet Metal Screws holding it in
place. (Remove Drain Pan Rails if applicable.)
Remove the Ignition Probe Sensor Bracket’s 4.
2 screws. (Note the orientation of the Ignition
Probe in ref to the Gas Burner Union Coupler.)
Remove the Insulation as needed to provide 5.
access to remove the Gas Burner Box. (Note
the insulation location for proper tting when
re-installed.) Fig I
Disconnect the Burner Union Coupler.6.
Remove the 2 mounting screws from Gas 7.
Burner’s support bracket.
Remove the Gas Burner by sliding it out of the 8.
Gas Burner Box.
9. Unscrew the PWR Cord retaining tting on the
Back Panel and pull some slack through the
tting, to allow for some room to remove the
Back Panel.
10. Unscrew the Back Panel’s sheet metal screws
and remove the Back Panel.
11. Remove the 2 bottom structural cross-braces.
12. Remove the mounting nuts on the Flue and the
Burner Box.
13. Remove the Exhaust Flue off the Gas Burner
Box. Fig J
14. Lift and remove the Gas Burner Box. (Might
have to use a at-head screwdriver to pry
up the Gas Burner Box from the Gas Burner
Gasket.) Fig K
Fig I
Fig J
Fig K
SP8026-1201 Pg 30
Page 38
HEAT TRANSFER PLATE REMOVAL & INSTALLATION
18
22246
14
16711
21012
3
1951713
21
15238
20
19
NOTE
If Heater Studs are Discovered Broken While Removing the Heater Transfer Plate
OR
If a Heater Stud Breaks-Off While Removing or Installing the Heater Transfer Plate
Call AccuTemp Service Dept (800) 480-0415.
HEAT TRANSFER PLATE (CON’T)
15. Using Fig L, Loosen all 24 nuts by starting with Zinc Nut #24 and working down to #1.
16. Remove all 24, Zinc Nut, Lock & Flat Washers from the Heat Transfer Plate.
17. Remove the Heat Transfer Plate. (Might have to use a at-head screwdriver to pry up the
Heater Plate from the Thermal Compound.)
18. Re-install in reverse order. SEE NEXT PAGE FOR INSTALLATION NOTES.
4
Fig L
Prior to installing the new Heat Transfer Plate:
Scrap, remove, and clean-off any remaining Thermal Compound residue from the steamer’s •
bottom (where the mounting studs are).
Apply Thermal Compound with a Square “D” notch trowel to the new Heat Transfer Plate’s •
at surface that makes contact with the steam chamber bottom.
Scrap, remove, and clean off any remaining Gas Burner Gasket residue from the steamer’s •
bottom (where the mounting studs are located).
Apply the 3 new Gas Burner Gaskets to the Bottom of the Burner Box when re-installing it. •
Side Gaskets = AT1I-3771-4 (Need 2) & Front Gasket = AT1I-37771-3
Front
Side
Of
The
Steamer
Reed Switch
Probe or
Probe Hole
SP8026-1201 Pg 31
Page 39
HEAT TRANSFER PLATE INSTALLATION
31256789111012131514161924221817212320
NOTE
The Zinc HEX Nut Needs to be Torqued Between 34 & 40 IN-LBS. Tighten Starting
with Zinc Nut #1 and Follow the Numbered Layout Pattern to Nut #24.
Tighten Twice in This Pattern.
Front
Side
4
Of
The
Steamer
Reed
Switch
Probe
or
Probe
Hole
CAUTION
DO NOT OVER TORQUE THE ZINC NUTS.
Over Torquing The Zinc Nuts Can Cause the Studs to Break-Off. This Will Cause
Heating Issues; and the Steamer Will Not Operate Correctly or Safely.
After Replacing Heat Transfer Plate, it is Mandatory to Check and
Verify that the Gas Valve has the Proper Water Column (WC) Value
Measured with a Manometer. Also Conrm No Gas Leaks Are Present.
SP8026-1201 Pg 32
Page 40
MISCELLANEOUS COMPONENTS REMOVAL & INSTALLATION
AUTO-FILL VALVE
Unplug the Unit & drain any remaining water from the 1.
steam chamber.
Close the supply water valve and disconnect the Supply 2.
Water Hose coming into the steamer.
Remove the Left-Side Panel by removing the Sheet 3.
Metal Screws holding it in place.
Disconnect the wires from the Auto-Fill Valve (4. note the
wire color to its location pin).
Disconnect the Auto-Fill Valve Hose Fitting. 5. Fig M
On the back of the steamer, remove the 4 mounting 6.
screws securing the Auto-Fill Valve bracket on the
inside of the steamer.
Remove the Auto-Fill Valve.7.
Re-install in reverse order. 8. Ensure Sealant is
re-applied to all pipe threading.
Fig M
OVER-FILL REED SWITCH
Unplug Unit & close the supply water valve.1.
Disconnect the garden hose from the back of the 2.
steamer & drain any remaining water from the steam
chamber.
Remove the Left-Side Panel by removing the Sheet 3.
Metal Screws holding it in place.
Disconnect the REED Switch wires (4. note the wire
color to its location pin).
Turn the unit upside-down and remove its legs. 5.
(Unbolt from stand and then turn unit upside-down if
applicable.)
Remove Bottom Cover by removing the Sheet Metal 6.
Screws holding it in place. (Remove Drain Pan Rails
if applicable.)
Remove the front, insulation pieces that are laying 7.
on-top of the Over-Fill Reed Switch. (Wire is ran
in-between the insulation pieces.)
Remove the retaining nut and lock washer holding the 8.
Reed Switch inside the Sensor Post.
Remove the High Water Reed Switch. 9. Fig N
Re-install in reverse order.10.
Fig N
SP8026-1201 Pg 33
Page 41
MISCELLANEOUS COMPONENTS REMOVAL & INSTALLATION
FLOAT BALL (MAGNETIC)
Open the steamer Door and remove the left-1.
side pan rail.
Lift and remove the steam collection cover 2.
plate.
Remove the Float Ball off of the High Water 3.
Reed Switch Sensor Post.
Re-install in reverse order. 4. Ensure
Sensor Post & Float Ball hole are clean
before re-installing.
DRAIN VALVE
Unplug the Unit & drain any remaining water 1.
from the steam chamber.
Turn the unit upside-down and remove its 2.
legs. (Unbolt from stand and then turn unit
upside-down if applicable.)
Remove Bottom Cover by removing the Sheet 3.
Metal Screws holding it in place. (Remove
Drain Pan Rails if applicable.)
Remove the Drain Handle Cover Plate, and the 4.
insulation surrounding the Drain Valve.
Remove the Drain Pipe from the Drain Valve.5.
Remove the Drain Valve.6.
Re-install in reverse order. 7. Ensure Sealant
is re-applied to all pipe threading.
Drain Cover
Plate
DRIP PAN
Split Drip Pan
Unplug the Unit.1.
Remove the 4 Sheet Metal Screws at the 2.
bottom of the Front Panel.
Slide the Drip Pan(s) out from between the 3.
Front Panel and the Bottom Panel. (Ensure the
split Drip Pans are sloped towards the center
of the steamer.)
Re-install in reverse order.4.
SP8026-1201 Pg 34
Solid Drip Pan
Page 42
DOOR COMPONENTS REMOVAL & INSTALLATION
DOOR ASSEMBLY
Unplug the unit and shut the Door.1.
Remove the Hinge Covers. 2. Fig O
Remove the 3 hinge screws going into the face 3.
of the steamer of the Bottom Hinge. Fig P
While supporting the Door on the hinge-side, 4.
remove the 3 hinge screws into the face of the
steamer of the Top Hinge.
Pull the door handle and remove the Door.5.
Re-install in reverse order. 6. Ensure
Anti-sieze is re-applied to all hinge screws.
If the Door Handle Latch Is Moved to the Opposite
Side, Ensure That the Door Switch Is Moved to the
Corresponding Door Handle Latch Side .
Fig O
Fig P
Face Screws
STEAMER WILL NOT OPERATE IF NOT DONE.
INNER-DOOR PANEL
Unplug the unit and shut the Door.1.
Remove the Hinge Covers. 2. Fig O
Remove the very bottom screw on the door 3.
hinge-side of the Bottom Hinge.
Remove the very top screw on the door 4.
hinge-side of the Top Hinge.
Pull the door handle and open the door5.
Lift and pull out the Inner Door Panel.6.
Re-install in reverse order. 7. Ensure
Anti-sieze is re-applied to all hinge screws.
Ensure That the Inner Door is Reinstalled with its
Middle Brace Bar Behind the Door Latch Tab. Fig R
Also, Ensure That the Screw Retainer Openings are
Lined-Up with the Door’s Hinge Side. Fig S
Inner Door
Fig R
Fig S
SP8026-1201 Pg 35
Page 43
DOOR COMPONENTS REMOVAL & INSTALLATION
DOOR HANDLE LATCH ASSEMBLY
Unplug the unit & shut the Door.1.
Remove the Hinge Covers. 2. Fig O
Remove the very bottom screw on the door 3.
hinge-side of the Bottom Hinge & remove the
very top screw on the door-side hinge of the
Top Hinge.
Pull the door handle and open the door4.
Lift and pull out the Inner Door Panel.5.
Remove the 3 mounting nuts and screws, 6.
holding the Door Handle Latch to the side of
the door, and the Inner Door Holding Tab.
Remove the Door Handle Latch Assembly.7.
Re-install in reverse order. 8. Ensure
Anti-sieze is re-applied to all hinge screws.
DOOR HINGE
Unplug the unit & shut the Door.1.
Remove the Hinge Covers. 2. Fig O
Remove the 3 hinge screws going into the face 3.
of the steamer of the Bottom Hinge.
While supporting the Door on the hinge-side, 4.
remove the 3 hinge screws into the face of the
steamer of the Top Hinge.
Pull the door handle and remove the Door.5.
Remove the very bottom screw on the door 6.
hinge-side of the Bottom Hinge & remove the
very top screw on the door-side hinge of the
Top Hinge.
Lift and pull out the Inner Door Panel.7.
Remove the remaining door-side screws for 8.
the hinge or hinges to be replaced. (Note the
orientation of the Hinge Spacer Bars as they
relate to the Hinge orientation.)
Remove the Door Hinge or Hinges.9.
Re-install in reverse order. 10. Ensure
Anti-sieze is re-applied to all hinge screws.
Ensure That the Inner Door is Reinstalled
with its Middle Brace Bar Behind the
Door Latch Tab. Fig R
Also, Ensure That the Screw Retainer
Openings are Lined-Up with the Door’s
Hinge Side. Fig S
SP8026-1201 Pg 36
Page 44
DOOR COMPONENTS REMOVAL & INSTALLATION
DOOR GASKET
Unplug the unit & shut the Door.1.
Remove the Hinge Covers. 2. Fig O
Remove the very bottom screw on the door 3.
hinge-side of the Bottom Hinge & remove the
very top screw on the door-side hinge of the
Top Hinge.
Pull the door handle and open the door4.
Lift and pull out the Inner Door Panel.5.
Remove the 6, Gasket retaining brackets by 6.
removing the 12 nyloc mounting nuts holding
them in place.
Remove the Door Gasket.7.
Re-install in reverse order. 8. Ensure
Anti-sieze is re-applied to all hinge screws.
INSTALLATION NOTE:
Make sure the new Door Gasket is •
untangled.
Starting at one corner, stretch the Gasket •
to the opposite corner.
Repeat this sequence until all 4 corners •
are seated.
Push the Gasket down all the way around •
to ensure the Gasket seats rmly on the
inner door.
Ensure That the Inner Door is Reinstalled with its
Middle Brace Bar Behind the Door Latch Tab. Fig R
Also, Ensure That the Screw Retainer Openings are
Lined-Up with the Door’s Hinge Side. Fig S
Gasket Retaining
Brackets
Gasket
Gasket Retaining
Bracket
SP8026-1201 Pg 37
Page 45
GAS EVOLUTION WIRING SCHEMATIC (S/N: 36980 & BELOW)
SP8026-1201 Pg 38
Page 46
GAS EVOLUTION WIRING SCHEMATIC (S/N: 36981 & ABOVE)
SP8026-1201 Pg 39
Page 47
GAS ORIFICE SIZE TO ALTITUDE CHART
SP8026-1201 Pg 40
Page 48
IGNITOR/FLAME SENSE PROBE SPACING MEASUREMENT
.095”
The distance between the GND Probe and the
Ignitor Probe is .095”. (This distance is roughly
the thickness size of a nickel.)
The distance between the Flame Sense
Probe/Ignitor Probe and the Burner’s
surface is .10”. (This distance is
roughly the thickness size of a nickel.)
.10”
SP8026-1201 Pg 41
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