Page 1
DFGĆ100 AND DFGĆ200 SERIES
CONVECTION OVEN
SERVICE AND REPAIR MANUAL
BLODGETT OVEN COMPANY
www.blodgett.com
44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone (802) 658Ć6600 Fax: (802)864Ć0183
PN 33082 Rev F (7/10)
Duplication of the information in this manual is prohibited without the consent of the Blodgett Service Department.
E 2010 - G.S. Blodgett Corporation All rights reserved.
Page 2
TABLE OF CONTENTS
1. INTRODUCTION
Oven Specifications 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ventilation 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. OPERATION
Manual Controls with ElectroĆMechanical Thermostat 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solid State Cook Only 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solid State Cook & Hold 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solid State Digital 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Delay with Pulse Plus 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidaire 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intelliplus with Chain Event Control 2-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch 2-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch II 2-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. CALIBRATION AND ADJUSTMENT
Doors 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Blower Switch 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burners 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solid State Manual 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch Control Second Level Programming 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solid State Digital Second Level Programming 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch II Second Level Programming 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intelliplus Second Level Programming 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. PARTS REPLACEMENT
Access Panels and Doors 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion Compartment Cover 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Cover 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Perimeter Door Gasket 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center Door Gasket 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oven Door 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Window Assembly for ovens with 50/50 Doors 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Window Assembly for Ovens with 60/40 Doors 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lower Door Hinge and Sprocket Assembly 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Chain Assembly 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor and Blower Assembly 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Wheel 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner and Deflector Assemblies 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manifold and Burner Orifices 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burners 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compartment Liner Bottom 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Page 3
TABLE OF CONTENTS
Deflector Assembly 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electric Igniter (Glow Coil) and Plumbing Components 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electric Igniter 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Delay Relay Assembly 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Regulator 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid Valve 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Stack Assembly 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
combination Dual Gas Valve 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intermittent Ignition Device (IID) and Plumbing Components 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Pilot Burner and Spark Ignition 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control and
Transformer 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Stack Assembly 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combination Dual Gas Valve 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Components 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb and Capillary Thermostat 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Components Located in the Control Module 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Switch 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. TROUBLESHOOTING
Heat HSI System 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flow Diagram 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Error Codes 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe resistance vs temperature 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Page 4
CHAPTER 1
INTRODUCTION
Page 5
DFGĆ100 and DFGĆ200
OVEN SPECIFICATIONS
VENTILATION REQUIREMENTS
Canopy Type Exhaust Hood
The preferred method of ventilation is the use of a
mechanically driven, canopy type exhaust hood.
The hood should completely cover the unit with an
overhang of at least 6" (15 cm) on all sides not adjaĆ
cent to a wall. The distance from the floor to the lowĆ
er edge of the hood should not exceed 7' (2.1 m).
The ventilation system should replace 80% of the
exhaust volume with fresh make up air.
Direct Flue
NOTE: U.S. and Canadian installations only.
The minimum recommended clearance of the oven
from any combustible, or nonĆcombustible material
should be 6" (15 cm). The height of the flue should
rise 6Ć8' (2Ć2.5 m) above the roof of the building, or
any proximate structure. The flue should be capped
with a UL listed vent cap to isolate the unit from exterĆ
nal environmental conditions.
The direct vent does not have the capability of reĆ
placing air consumed and vented by the oven. It is
important that provisions be made to supply the
room with sufficient makeĆup air. Total makeĆup air
requirements for each oven section should be
about 19 CFM.
ELECTRICAL SPECIFICATIONS
NOTE: Three Phase hookup is not permitted on
gas models.
WARNING: DO NOT INSTALL A HIGH LEG" TO
ANY CONVECTION OVEN!
The DFGĆ100 and DFGĆ200 ovens are supplied for
connection to 115 VAC grounded circuits with the
6' (1.8 m) power cord supplied. All ovens, when
installed must be electrically grounded in accorĆ
dance with National Electric or local codes.
CE approved installations
Connect the oven to a separate group 230V, 50 hz
with rigid connection and operating switch. Use
90_C wire and size according to local codes.
NOTE: The burner control unit is phase sensitive.
If the phase and neutral are switched the
control locks out.
Connect phase + neutral + ground.
L1
N
115
OvenSupply
1-1
U.S. Installations
L1
N
230
CE Approved Installations
FIGURE 1
OvenSupply
Page 6
GAS SPECIFICATIONS
INTRODUCTION
GAS CONNECTIONS
Domestic and General Export installations
The gas line should be large enough to accommoĆ
date the peak demand of all the gas appliances.
TABLE 1 reflects a straight line, 50 foot run with no
coupling restrictions and no other appliances
drawing service. Gas line installations MUST conĆ
form to National Fuel Gas Code NFPA 54/ANSI
Z223.1 Sec. 1.4 (Latest Edition). TABLE 1 should
be used as a guideline only.
NOTE: For any pipe runs over 50 feet (15 m), conĆ
sult the factory.
CE approved installations
1. Connect the oven to the gas line with the propĆ
er type of gas according to Local and National
Installation Standards. See TABLE 1.
DOMESTIC AND GENERAL EXPORT
Natural Gas Propane Gas
US units SI units US units SI units
Heating Value 1000 BTU/hr 37.3 MJ/m
GAS REQUIREMENTS
NOTE: For natural gas meter sizing, consult your
Installations within the U.S.
1. Add the total BTU's/hr of all the gas appliances.
2. Convert BTU's to cubic ft/hr using the formula
Cu Ft/Hr = 1000 BTU/Hr for natural gas.
3. Size the meter accordingly.
Installations outside the U.S.
1. Add the total M3/min of all the appliances.
2. Size the meter accordingly.
local gas company to ensure that your meĆ
ter will provide the proper supply.
3
2550 BTU/hr 95.0 MJ/m
3
Specific Gravity (air = 1.0) 0.63 0.63 1.53 1.53
Gas Manifold Pressure 3.5" W.C. 0.87 kPa 10" W.C. 2.49 kPa
Oven Input
DFGĆ100Ć3
DFGĆ200ĆL
Main Burner Orifice Size
DFGĆ100Ć3
DFGĆ200ĆL
CE APPROVED UNITS
Type of
Gas
G25 25 12 2,60 18 0,53 16,2 Nat. Gas
G20 20 8 2,60 18 0,53 16,2 Nat. Gas
G20/G25 20/25 Totally Inscrewed
G30 30/50 17 1,60 10 0,28 16,2 Butane
G31 30/37/50 24 1,60 10 0,28 16,2 Propane
Inlet
Pressure
mbars
Burner Pressure
Pressure Regulator
55,000 BTU/hr
60,000 BTU/hr
40 MTD
38 MTD
mbars
16.2 kW/Hr.
17.6 kW/Hr.
2.5 mm
2.6 mm
Injector
Diameter
mm
2,10 18 0,53 16,2 Nat. Gas
55,000 BTU/hr
60,000 BTU/hr
Air
Opening
mm
53 MTD
1/16 dia.
Pilot
Injector
mm
16.2 kW/Hr.
17.6 kW/Hr.
1.5 mm
1.55 mm
Standard
Delivery
Value kW (HS)
TABLE 1
1-2
Page 7
DFGĆ100 and DFGĆ200
VENTILATION
CANOPY TYPE EXHAUST HOOD
Ovens that are ordered for underĆhood venting are
supplied with a draft diverter. When supplied with
a draft diverter, the oven must be installed under a
mechanically driven exhaust hood.
1. To install, place the diverter with the open area
toward the rear of the oven.
2. Secure both ends with the sheet metal screws
provided.
Front of
Oven
FIGURE 2
TRIM COLLAR
1. Remove the trim collar from its shipping posiĆ
tion at the rear of the oven.
2. Remove the protective coating from the stainĆ
less steel portion of the collar.
3. Install the collar in the proper position at the top
of the oven.
Trim Collar
DIRECT FLUE ARRANGEMENT
NOTE: Not available for CE approved installations.
Ovens that are ordered for direct venting are
supplied with a direct vent.
1. To install, place the direct vent with the angle on
the bottom facing toward the front of the oven
2. Secure both ends with the sheet metal screws
provided.
Front of
Oven
FIGURE 3
Trim Collar
FIGURE 4
1-3
Page 8
CHAPTER 2
OPERATION
Page 9
DFGĆ100 and DFGĆ200
MANUAL CONTROLS WITH ELECTROĆMECHANICAL THERMOSTAT
NOTE: The following instructions represent the most common controllers. For questions regarding other
options call the Blodgett Service Department at (800)331Ć5842.
SEQUENCE OF OPERATION - DIAGRAM P/N 17794 REV A
Component Reference
NOTE: Refer to FIGURE 5 page 2-2 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. COOK THERMOSTAT
3. COOK TIMER
4. GAS SOLENOID
5. DOOR SWITCH
6. CONVECTION MOTOR
7. CENTRIFUGAL SWITCH
8. THERMAL DELAY RELAY
9. HOT SURFACE IGNITER
10. COOK LIGHT
11. BUZZER
12. LIGHT BULBS
13. LIGHT SWITCH
Operation
1. Power is applied to the appliance by a 110VAC
power cord attached to the rear of the oven.
2. Power is at terminal L1 and N of the mode seĆ
lector switch (1).
3. If the mode switch is turned on then a circuit is
made between L1 and Terminal 1 allowing curĆ
rent flow to one side of the cook thermostat (2),
cook timer (3), pilot valve portion of the gas soĆ
lenoid valve (4) and one side of a SPST door
switch (5).
4. If the door switch is closed, power goes to terĆ
minal #4 of the mode selector switch and to
the L1 side of the convection motor (6) allowing
the motor to start.
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam that is mounted to the right
hand hinge pin.
5. On a call for heat, the cook thermostat closes
sending power to one side of a centrifugal
switch (7). If the motor is operating at full
speed, this switch should be closed sending
power to terminals 8 and 6 of a thermal delay
relay (8).
NOTE: The centrifugal switch is an integral
part of the convection motor and is not
field repairable.
NOTE: The thermostat is a fluid filled bulb and
capillary style. The bulb is located in
the upper right hand corner of the bake
chamber.
6. The area connecting terminals 6 and 1 of the
thermal delay relay is called a heater strip.
NOTE: The thermal delay relay contains both
the heater strip and the set of contacts
that operate the gas valve in what looks
like an old TV tube. This tube is
plugged into a socket, so removal of
the tube is simple.
NOTE: This strip warms up as voltage is apĆ
plied to the HSI.
7. As the hot surface igniter (9) gets hotter so
does the heater strip. The heat from the strip
causes two strips of metal to come together
and touch allowing current to flow from termiĆ
nal 8 to terminal 3 of the TDR to the main porĆ
tion of the gas solenoid valve and an indicator
light (10). This light goes on and off every time
the main gas valve is powered up.
8. Gas flows to the burners and is ignited by the
high temperature of the HSI.
9. The timer is a mechanical count down timer. It
closes a set of contacts within the timer to powĆ
er up a buzzer (11) at the expiration of whatevĆ
er time the operator dials in.
10. The lights (12) are operated by a STDP rocker
switch (13).
2-1
Page 10
12
OPERATION
1
11
4
10
9
4
13
6
2
8b
8a
7
5
3
1
FIGURE 5
2-2
Page 11
DFGĆ100 and DFGĆ200
SOLID STATE COOK ONLY
SEQUENCE OF OPERATION - DIAGRAM P/N 20027 REV A
Component Reference
NOTE: Refer to FIGURE 6 page 2-4 for compoĆ
nent locations.
1. MODE SWITCH
2. DOOR MICROSWITCH
3. TEMPERATURE CONTROL BOARD
4. AXIAL FAN
5. 60 MINUTE TIMER
6. 110/24 VOLT TRANSFORMER
7. TEMPERATURE PROBE
8. IGNITION CONTROL MODULE
9. TWO SPEED MOTOR
10. CENTRIFUGAL SWITCH
11. PILOT VALVE
12. PILOT BURNER
13. MAIN VALVE
14. LIGHT BULBS
15. LIGHT SWITCH
16. BUZZER
Operation
1. Power is applied to the appliance by a 110VAC
power cord attached to the rear of the oven.
2. Power is at terminal L1 and N of the mode seĆ
lector switch (1).
ture control board (3) and the ignition control
module (8).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam that is mounted on the right
hand hinge pin.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
5. On a call for heat from the thermostat as
sensed by an RTD probe (7), a set of contacts
on the temperature control board (3) close
completing a circuit to terminal 2 of the ignition
control module (8).
NOTE: The thermostat consists of three comĆ
ponents (RTD probe, solid state temĆ
perature control board and 1000 ohm
potentiometer)
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
6. After the ignition control module (8) completes
a diagnostics and all functions check out,
24VAC is sent to the pilot valve (11) and a high
energy spark jumps a gap at the pilot burner
(12). Once the pilot is lit and the pilot flame is
proven, the ignition control module (8) sends
24VAC to the main valve (13).
3. If the mode switch (1) is turned on a circuit is
made between L1 and 1, N and 2 allowing curĆ
rent to flow to one side of a SPST door switch
(2), terminal #8 of the solid state temperature
control board (3), axial fan (4), terminal 1 of the
cook timer (5) and to the primary side of a 110
volt to 24 volt transformer (6).
4. If the doors are closed, the door switch (2)
should be closed sending power to the conĆ
vection blower (9). When this motor reaches
full speed a centrifugal switch (10) closes
sending 24VAC to terminal 6 of the temperaĆ
NOTE: A 24VAC indicator light is wired in parĆ
allel with the main valve to inform the
operator that the main gas valve is beĆ
ing powered up. When the light goes
out the thermostat is satisfied.
7. The lights (14) are controlled by a SPST rocker
switch (15).
8. The buzzer (16) is controlled by a switch in the
cook timer.
NOTE: The timer's only function is to count
down and activate a buzzer. This will
not shut down the oven.
2-3
Page 12
OPERATION
4
9
3
16
6
11
13
15
14
7
5
2
1
12
8
10
FIGURE 6
2-4
Page 13
DFGĆ100 and DFGĆ200
SOLID STATE COOK & HOLD
SEQUENCE OF OPERATION - DIAGRAM P/N 19604 REV A
Component Reference
NOTE: Refer to FIGURE 7 page 2-7 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. DPDT RELAY
3. LIGHT SWITCH
4. 60 MINUTE TIMER
5. 110/24 VOLT TRANSFORMER
6. TEMPERATURE CONTROL BOARD
7. AXIAL FAN
8. HOLD TEMPERATURE CONTROL BOARD
9. DOOR MICROSWITCH
10. CONVECTION BLOWER MOTOR
11. CENTRIFUGAL SWITCH
12. IGNITION CONTROL MODULE
13. TPDT RELAY
14. COOK TEMPERATURE PROBE
15. A & B DUAL SOLENOID GAS VALVE
16. COOK & HOLD TIMER
17. HOLD INDICATOR LIGHT
18. HOLD TEMPERATURE PROBE
Operation
1. Power is applied to the appliance by a 110VAC
power cord attached to the rear of the oven.
2. Power is at terminal L1 and N of the mode seĆ
lector switch (1), one of the NC terminals of a
DPDT relay (2) and one terminal of SPST light
switch (3).
3. If the mode selector switch (1) is turned to the
cook position a circuit is made between L1 and
terminal 4. 110VAC flows to terminal 1 of the 60
minute timer (4), the primary side of a 110 to 24
volt transformer (5), terminals 6 and 8 of the
temperature control board (6), axial cooling
fan (7) and terminal 8 of the hold temperature
board (8).
tion control module (12) and terminal 7 of a
TPDT relay (13).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam mounted on the right hand
hinge pin.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
5. On a call for heat from the thermostat as
sensed by an RTD probe (14), a set of contacts
on the temperature control board (6) closes
completing a circuit between terminals 6 and
7 allowing 110 volts AC to go to one of the norĆ
mally closed contacts on the DPDT relay (2).
The relay sends 110 volts AC to the coil of the
TPDT relay (13) allowing the circuit to be made
between terminals 7 and 4 of the same relay.
This completes the circuit to the ignition conĆ
trol module (12).
NOTE: The thermostat consists of three comĆ
ponents (RTD probe, solid state temĆ
perature control board and a 1000
ohm potentiometer.)
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
6. After the ignition control module (12) has comĆ
pleted a diagnostics and all functions check
out, 24VAC is sent to the pilot valve (15a) and
a high energy spark jumps a gap at the pilot
burner. Once the pilot is lit and the pilot flame
is proven, the ignition control (12) sends
24VAC to the main valve (15b).
NOTE: A 24VAC indicator light is wired in parĆ
allel with the main valve to inform the
operator that the main gas valve is beĆ
ing powered up. When the light goes
out the thermostat is satisfied.
4. If the doors are closed, the door switch (9)
should be closed sending power to the conĆ
vection blower (10). This switch interrupts the
neutral going to the motor. Once this motor
reaches full speed a centrifugal switch (11)
closes sending 24VAC to terminal 6 of the igniĆ
2-5
Page 14
OPERATION
7. If the mode selector switch (1) is set to the
Cook & Hold position a circuit is made in the
switch between L1, 1 and 4. All of the previousĆ
ly mentioned circuitry is active as well as the
cook and hold circuit.
8. At the expiration of time on the cook and hold
timer (16) a circuit is made between terminals
1 and 4 allowing power to go to a hold indicator
light (17), terminal 6 of the hold temperature
board and the coil of the DPDT relay (2) allowĆ
ing the relay (8) to toggle between C-NC to
C-NO terminals.
9. When there is a demand for heat from the hold
temperature board (8) as sensed by the temĆ
perature probe (18) a set of contacts on the
temperature control board closes completing
a circuit between terminals 6 and 7 allowing
110VAC to go to one of the normally open conĆ
tacts on the DPDT relay (2) which in turns
sends 110VAC to the coil of the TPDT relay (13)
allowing the circuit to be made between termiĆ
nals 7 and 4 of the same relay. This completes
the circuit to the ignition control module (12).
This toggling effect also allows 110VAC to go
to the convection blower (10). This cycles the
blower on and off every time there is a call from
heat from the hold board (8).
NOTE: The thermostat consists of three comĆ
ponents (RTD probe, solid state temĆ
perature control board and a 1000
ohm potentiometer).
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
NOTE: The two temperature probes and poĆ
tentiometers used in this oven configuĆ
ration are identical. The solid state
temperature control boards appear
identical, however, they are significantĆ
ly different. The hold board will not allow
for temperatures over 200_F (93_C).
NOTE: The timer's only function is to count
down and activate a buzzer. This will
not shut down the oven.
2-6
Page 15
DFGĆ100 and DFGĆ200
9
1
17
8
10
18
7
2
15b
5
15a
6
13
16
14
3
2
1
4
13
12
11
FIGURE 7
2-7
Page 16
SOLID STATE DIGITAL
SEQUENCE OF OPERATION - DIAGRAM P/N 31981 REV F
OPERATION
NOTE: Refer to FIGURE 8 page 2-9 for compoĆ
nent locations.
Component Reference
1. MODE SWITCH
2. DOOR SWITCH
3. TIME AND TEMPERATURE CONTROL
4. AXIAL FAN
5. SINGLE SPEED MOTOR
6. CENTRIFUGAL SWITCH
7. PRESSURE SWITCH
8. LANDIS & GYR IGNITION CONTROL
9. 2 SECOND TIMER
10. A & B DUAL SOLENOID GAS VALVE
11. TEMPERATURE PROBE
Operation
1. Power is applied to terminals L1 and N of the
mode selector switch (1).
2. If the mode selector switch is set to cook,
230VAC is sent to one side of a SPST door
switch (2), terminals J11 and J8 of the time and
temperature control (3) and the axial cooling
fan (4).
3. If the doors are closed the door switch (2)
should be closed sending 230VAC to the conĆ
vection fan motor (5).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam mounted on the right hand
hinge pin.
NOTE: The motor only operates continuously
if the control is not set for pulse. If there
is a time programmed into the control
for pulse the control opens and closes
a set of contacts on the control to cycle
the fan on and off.
4. If there is a temperature programmed into the
time and temperature control (3) and the control
is calling for heat as sensed by the RTD probe
(11), 230VAC is applied to one side of a centrifuĆ
gal switch (6) in the convection motor (5).
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
5. If the motor (5) is up to full speed the centrifugal
switch (6) should be closed sending power to
the pressure switch (7). If the pressure switch
is closed, 230VAC is applied to the Landis &
Gyr ignition module (8).
6. This ignition module is used for direct spark
application. This appliance utilizes a two secĆ
ond timer (9) wired in parallel with the pilot
valve (10a) to keep power from going to the
main valve (10b) for two seconds after the pilot
is lit.
2-8
Page 17
DFGĆ100 and DFGĆ200
1
2
5
3
11
9
10A
7
6
8
4
10B
FIGURE 8
2-9
Page 18
SEQUENCE OF OPERATION - DIAGRAM P/N 30073 REV F
OPERATION
NOTE: Refer to FIGURE 9 page 2-11 for compoĆ
nent locations.
Component Reference
1. MODE SWITCH
2. LIGHT SWITCH
3. TIME AND TEMPERATURE CONTROL
4. TRANSFORMER
5. AXIAL FAN
6. TWO SPEED MOTOR
7. TEMPERATURE PROBE
8. CENTRIFUGAL SWITCH
9. IGNITION CONTROL MODULE
10. A & B DUAL SOLENOID GAS VALVE
11. PILOT BURNER
12. DOOR SWITCH
Operation
1. Power is applied to the appliance by a 110 volt
power cord attached to the rear of the oven.
2. Power is at L1 and N of the mode selector
switch (1).
3. Power is also applied to one side of a SPST
light switch (2).
6. If the doors are closed, the door switch (12)
should be closed sending 110VAC to the conĆ
vection fan motor (6).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam that is mounted on the right
hand hinge pin.
NOTE: The motor will only operate continuĆ
ously if the control is not set for pulse.
If there is a time programmed into the
control for pulse the control opens and
closes a set of contacts on the the conĆ
trol to cycle the fan on and off.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
7. If the motor (6) is up to full speed, the centrifuĆ
gal switch (8) closes sending 24VAC to termiĆ
nal J11 of the temperature control (3).
8. If there is a temperature programmed into the
time and temperature control (3) and the conĆ
trol is calling for heat as sensed by an RTD
probe (7), a circuit is completed between J9
and J11 of the time and temperature control (3)
allowing 24VAC to go to the main valve (10b).
4. When the mode selector switch (1) is set to the
cook position a circuit is made between N and
terminal 3 as well as L1 and terminal 4 or 1 deĆ
pending on which motor operation is selected.
NOTE: The mode selector switch in this apĆ
plication is a four position selector
switch and allows for hi and low speed
fan operation.
5. Power is delivered to the common terminal and
terminal J8 of the time and temperature conĆ
troller (3), the primary side of a 110 to 24 volt
transformer (4) and to an axial cooling fan (5).
When the transformer is powered up 24VAC is
delivered to terminals 6 and 2 of the ignition
control module (9). After the ignition control
module has completed a diagnostic and all
functions check out, 24VAC is sent to the pilot
valve (10a) and a high energy spark jumps a
gap at the pilot burner (11). Once the pilot is lit
and the pilot flame is proven the ignition control
module (9) sends 24VAC to the centrifugal
switch (8) in the convection fan (6).
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
2-10
Page 19
DFGĆ100 and DFGĆ200
2
6
1
1
12
11
9
10a
8
4
3
10b
7
5
FIGURE 9
2-11
Page 20
FAN DELAY WITH PULSE PLUS
SEQUENCE OF OPERATION - DRAWING P/N 20029 REV A
OPERATION
Component Reference
NOTE: Refer to FIGURE 10 page 2-14 for compoĆ
nent locations.
1. MODE SELECTOR
2. TEN MINUTE FAN DELAY TIMER
3. TEMPERATURE CONTROL BOARD
4. AXIAL FAN
5. PULSE TIMER
6. TRANSFORMER
7. DOOR SWITCH
8. TWO SPEED MOTOR
9. CENTRIFUGAL SWITCH
10. IGNITION CONTROL
11. TEMPERATURE PROBE
12. A & B DUAL SOLENOID GAS VALVE
13. COOK TIMER
14. TPDT RELAY
15. TPDT SWITCH
16. LIGHT BULBS
17. LIGHT SWITCH
18. BUZZER
Operation
5. If the doors are closed the door switch (7)
should be closed sending power to the conĆ
vection blower (8). When this motor reaches
full speed, a centrifugal switch (9) closes sendĆ
ing 24VAC to terminal 6 of the temperature
control board (3) and the ignition control modĆ
ule (10).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam that is mounted on the right
hand hinge pin.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
6. On a call for heat from the thermostat as
sensed by an RTD probe (11) a set of contacts
on the temperature control board (3) close
completing a circuit to terminal 2 of the ignition
control module (10).
NOTE: The thermostat consists of three comĆ
ponents (RTD probe, solid state temĆ
perature control board and a 1000
ohm potentiometer).
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
1. Power is applied to the appliance by a 110 volt
power cord attached to the rear of the oven.
2. Power is at L1 and N of the mode selector
switch (1).
3. If the mode switch (1) is turned on, a circuit is
made between L1-1 and N-2, allowing curĆ
rent to flow to terminal 1 of the fan delay timer
(2), terminal #8 of the solid state temperature
control board (3) and the axial fan (4).
4. If the fan delay timer (2) is not counting down,
a circuit is made between terminals 1 and 4 alĆ
lowing voltage to go to terminal 3 of the pulse
timer (5), one side of a SPST door switch (7),
terminal 1 of the cook timer (13) and the primaĆ
ry side of a 110 to 24 volt transformer (6).
7. After the ignition control module (10) has comĆ
pleted a diagnostics and all functions check
out, 24VAC is sent to the pilot valve (12a) and
a high energy spark jumps a gap at the pilot
burner. When the pilot is lit and the pilot flame
is proven, the ignition control module (10)
sends 24VAC to the main valve (12b).
NOTE: A 24VAC indicator light is wired in parĆ
allel with the main valve to inform the
operator that the main gas valve is beĆ
ing powered up. The light goes out
when the thermostat is satisfied.
2-12
Page 21
DFGĆ100 and DFGĆ200
8. If time has been set on the fan delay timer (2),
a circuit is made between terminals 1 and 2 alĆ
lowing voltage to go to terminal 2 of the pulse
timer. This sends voltage to the coil of a TPDT
relay (14).
NOTE: The sole purpose of this relay is to
eliminate power to the cook timer moĆ
tor during pulse operation.
NOTE: The pulse timer is a solid state device
which pulses the convection fan on
and off for approximately 30 second inĆ
tervals.
9. The fan delay timer (2) can be set for no more
than 10 minutes. The solid state pulse timer (5)
will make and break the circuit between termiĆ
nals 2 and 3 allowing voltage to go to the door
switch (7) and the primary side of the step
down transformer (6).
10. If the door switch (7) is closed a circuit is comĆ
pleted to a TPDT blower switch (15).
NOTE: This blower switch will operate motor
speed based on the switch position.
NOTE: When the convection fan cycles on and
off, the ignition control system also
cycles on and off.
11. The lights (16) are controlled by a SPST rocker
switch (17).
12. The buzzer (18) is controlled by a switch in the
cook timer (13).
NOTE: The timer's only function is to count
down and activate a buzzer. This will
not shut down the oven.
2-13
Page 22
OPERATION
1
14
13
15
8
5
3
11
2
7
1
6
12B
4
10
12A
9
FIGURE 10
2-14
Page 23
DFGĆ100 and DFGĆ200
HUMIDAIRE
SEQUENCE OF OPERATION - DRAWING P/N 18486 REV H
Component Reference
NOTE: Refer to FIGURE 11 page 2-17 for compoĆ
nent locations.
1. MODE SWITCH
2. 60 MINUTE COOK TIMER
3. TEMPERATURE CONTROL BOARD
4. TRANSFORMER
5. AXIAL FAN
6. DOOR SWITCH
7. SINGLE SPEED MOTOR
8. CENTRIFUGAL SWITCH
9. IGNITION CONTROL
10. TEMPERATURE PROBE
11. A & B DUAL SOLENOID VALVE
12. PILOT BURNER
13. STEAM POTENTIOMETER
14. SINGLE SHOT TIMER
15. THERMAL DISC
16. STEAM SWITCH
17. WATER SOLENOID
18. LIGHT BULBS
19. LIGHT SWITCH
20. BUZZER
Operation
1. Power is applied to the appliance by a 110 volt
power cord attached to the rear of the oven.
2. Power is at L1 and N of the mode selector
switch (1).
3. If the mode switch (1) is turned on, a circuit is
made between L1and 1, N and 2 allowing curĆ
rent to flow to terminal 1 of the cook timer (2), terĆ
minal #8 of the solid state temperature control
board (3), the axial fan (5) and the primary side
of a 110 to 24 volt step down transformer (4).
4. If the doors are closed, the door switch (6)
should be closed sending power to the convecĆ
tion blower (7). When the motor reaches full
speed a centrifugal switch (8) closes sending
24VAC to terminal 6 of the temperature control
board (3) and the ignition control module (9).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam mounted on the right hand
hinge pin.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
5. On a call for heat from the thermostat as
sensed by an RTD probe (10) a set of contacts
on the temperature control board (3) close
completing a circuit to terminal 2 of the ignition
control module (9).
2-15
NOTE: The thermostat consists of three comĆ
ponents (RTD probe, solid state temĆ
perature control board and a 1000
ohm potentiometer).
NOTE: The temperature probe has a deĆ
scending temperature coefficient.
Page 24
6. After the ignition control module (9) has comĆ
pleted a diagnostics and all functions check
out, 24VAC is sent to the pilot valve (11a) and
a high energy spark jumps a gap at the pilot
burner (12). When the pilot is lit and the pilot
flame is proven, the ignition control module (9)
sends 24VAC to the main valve (11b).
NOTE: A 24VAC indicator light is wired in parĆ
allel with the main valve to inform the
operator that the main gas valve is beĆ
ing powered up. When the light goes
out, the thermostat is satisfied.
7. If there is a time set on the steam potentiomeĆ
ter (13), a solid state single shot timer (14) actiĆ
vates, only if the temperature on the oven cavĆ
ity is above 212_F (100_C) as sensed by a
thermal disc (15). When the steam cycle
switch (16) is pressed atomized water is inĆ
jected into the oven cavity through a water soĆ
lenoid valve (17) onto the blower wheel.
NOTE: The thermal disc is located in the back
of the oven attached to the oven liner.
OPERATION
NOTE: The steam start switch is a momentary
switch located on the front control panel.
8. The lights (18) are controlled by a SPST rocker
switch (19).
9. The buzzer (20) is controlled by a switch in the
cook timer (2).
NOTE: The timer's only function is to count
down and activate a buzzer. This will
not shut down the oven.
2-16
Page 25
DFGĆ100 and DFGĆ200
18
1
17
13
19
7
4
20
3
10
6
2
15
14
16
5
11b
9
12
11a
1
8
FIGURE 11
2-17
Page 26
INTELLIPLUS WITH CHAIN EVENT CONTROL
SEQUENCE OF OPERATION - DRAWING P/N 21846 REV D
OPERATION
Component Reference
NOTE: Refer to FIGURE 12 page 2-19 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. DOOR SWITCH
3. CONTROLLER
4. AXIAL FAN
5. TRANSFORMER
6. TWO SPEED MOTOR
7. CENTRIFUGAL SWITCH
8. IGNITION CONTROL
9. RTD PROBE
10. A & B GAS VALVES
11. PILOT BURNER
12. A & B DPDT RELAY
13. LIGHT BULBS
14. LIGHT SWITCH
Operation
1. Power is applied to the appliance by a 110 volt
power cord attached to the rear of the oven.
2. Power is at L1 and N of the mode selector
switch (1).
3. If the mode switch (1) is turned on then a circuit
is made between L1 and 1, N and 2, allowing
current to flow to a terminal on a SPST door
switch (2), to terminal E3 of the Intelliplus control
board (3), an axial fan (4) and the primary side
of a 110 to 24 volt step down transformer (5).
4. If the doors are closed the door switch (2)
should be closed sending 110VAC to K2 and
K3 of the Intelliplus controller (3) and the conĆ
tacts of a DPDT relay (12a). If there is a time,
temperature and motor function either dialed
or programmed into the controller (3), K2 or K3
should close sending power to the convection
blower motor.
NOTE: If K3 is energized, the coil of the DPDT
relay powers up allowing its contacts
to toggle.
NOTE: The motor only operates continuously
if the control is not set for pulse. If a
time is programmed for pulse, the conĆ
trol opens and closes a set of contacts
to cycle the fan on and off.
NOTE: Every time the convection fan cycles
on and off the ignition control system
also cycles on and off.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
5. If the motor (6) is up to full speed the centrifugal
switch (7) should be closed sending 24VAC to
terminal 6 of the ignition control (8) and E6 of
K1 on the Intelliplus control (3).
6. If there is a temperature programmed into the
Intelliplus control (3) and the control is calling
for heat as sensed by the RTD probe (9), a cirĆ
cuit is completed between E6 and E7 of the InĆ
telliplus control (3) allowing 24 volts to go to
terminal 2 of the ignition control (8).
NOTE: The temperature probe has an ascendĆ
ing temperature coefficient.
7. After the ignition control module (8) has comĆ
pleted a diagnostic and all functions check
out, 24VAC is sent to the pilot valve (10a) and
a high energy spark jumps a gap at the pilot
burner (11). When the pilot is lit and the pilot
flame is proven, the ignition control module
sends 24VAC to the main valve (10b).
NOTE: A 24VAC indicator light is wired in parĆ
allel with the main valve to inform the
operator that the main gas valve is beĆ
ing powered up. When the light goes
out the thermostat is satisfied.
NOTE: The time and temperature indicators
built into the control flash until the oven
has reached set point.
8. The lights (13) are controlled by a SPST rocker
switch (14).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam mounted on the right hand
hinge pin.
2-18
Page 27
DFGĆ100 and DFGĆ200
1
12a
5
10a
12b
6
13
14
1
3
2
9
4
10b
18
11
7
FIGURE 12
2-19
Page 28
INTELLITOUCH
SEQUENCE OF OPERATION - DRAWING P/N 19465 REV B
OPERATION
Component Reference
NOTE: Refer to FIGURE 13 page 2-21 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. DOOR SWITCH
3. TRANSFORMER
4. CONVECTION BLOWER
5. CENTRIFUGAL SWITCH
6. IGNITION CONTROL MODULE
7. SPDT RELAY
8. TEMPERATURE CONTROLLER
9. RTD PROBE
10. PILOT VALVE
11. PILOT BURNER
12. MAIN VALVE
Operation
1. Power is applied to the appliance by a 110VAC
power cord delivering power to the mode seĆ
lector switch (1).
2. If the mode selector switch (1) is in the cook
position a circuit is made between L1 and terĆ
minal 1 and N and terminal 2 allowing voltage
to go to one side of a SPST door switch (2) and
the primary side of a 110 to 24 volt step down
transformer (3).
4. On a call for heat from the temperature controlĆ
ler (8) as sensed by an RTD probe (9) a set of
contacts in the temperature control (8) closes
allowing 24VAC to go to the coil of a SPDT relay
(7). When this relay is energized a switch within
the relay toggles allowing a circuit to be made
between terminals 7 and 5 (7). This completes
the circuit to the ignition control module (6) at
terminal 2.
5. After the igntion control module (6) has comĆ
pleted a diagnostics and all functions check
out, 24VAC is sent to the pilot valve (10) and a
hight energy spark jumps a gap at the pilot
burner (11). When the pilot is lit and the pilot
flame is proven, the ignition control module (6)
sends 24VAC to the main valve (12)
NOTE: The cooling fan in this oven runs all of
the time when the unit is turned on.
NOTE: The lights are activated by a SPST
switch and can be turned on even if the
oven is off.
3. If the doors are closed, the door switch (2)
should be closed sending power to the conĆ
vection blower (4). When this motor reaches
full speed a centrifugal switch (5) closes sendĆ
ing 24VAC to terminal 6 of the ignition control
module (6) and terminal 7 of a SPDT relay (7).
NOTE: The door switch is located behind the
combustion cover and is operated by
the cam that is mounted on the right
hand hinge pin.
NOTE: The centrifugal switch is an integral
part of the convection blower and is
not field repairable.
2-20
Page 29
DFGĆ100 and DFGĆ200
1
4
8
9
12
7
7a
10
3
11
2
1
5
FIGURE 13
2-21
Page 30
INTELLITOUCH II
SEQUENCE OF OPERATION - DRAWING P/N 31173 REV C
OPERATION
Component Reference
NOTE: Refer to FIGURE 14 page 2-23 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. TPDT RELAY
3. TPDT RELAY
4. AXIAL FAN
5. DOOR SWITCH
6. CONTROL
7. TRANSFORMER
8. TWO SPEED MOTOR
9. IGINTION CONTROL
10. A & B GAS VALVE
11. TEMPERATURE PROBE
Operation
1. Power is applied to the appliance by a 110VAC
power cord. Power is delivered to the mode seĆ
lector switch (1).
2. If the switch (1) is turned on, power goes to a
set of contacts on relay 1 (2), a set of contacts
on relay 2 (3), an axial fan (4), one side of a
SPST door switch (5), terminals J20, J25 and
J47 of the Intellitouch temperature control (6)
and the primary side of a 110 to 24 volt step
down transformer (7).
3. If the control (6) is programmed to cook a prodĆ
uct and the door switch (5) is closed, the relays
within the control close depending on the funcĆ
tion chosen. When the operator chooses a
particular program, the high or low fan switch
closes allowing the coils of either relay 1 (2a)
or relay 2 (3a) to power up closing their respecĆ
tive contacts.
NOTE: These relays interrupt both the hot and
neutral wires to the convection fan.
4. If the temperature control (6) is calling for heat
as sensed by a temperature probe (11) and the
convection motor (8) has reached full speed,
a centrifugal switch cloes sending 24VAC to
terminal 2 of the ignition control (9). After the
ignition control (9) has completed a diagnosĆ
tics the pilot valve (10a) powers up. After proof
of flame, the main valve (10b) powers up.
NOTE: The centrifugal switch is an integral
part of the convection motor and is not
considered field repairable.
NOTE: The lights get power from a momentary
switch. Lights go out every time the
switch is released.
NOTE: The temperature control is a chain
event control that allows the operator
to program various motor, timing and
temperature functions for different
food product. At the expiration of proĆ
grammed time another event takes
place. If no time is put into the control,
the control cannot count down and the
chain is broken.
NOTE: The control is backed up with several
different support items such as a meĆ
chanical thermostat and switch to take
the control out of the heat circuit.
NOTE: The temperature probe ascends as
temperature increases.
2-22
Page 31
DFGĆ100 and DFGĆ200
1
2
3
5
8
4
6
3a
2a
1
11
9
10b
7
10a
FIGURE 14
2-23
Page 32
CHAPTER 3
CALIBRATION AND
ADJUSTMENT
Page 33
DFGĆ100 and DFGĆ200
DOORS
The DFGĆ100 and DFGĆ200 ovens feature double
side mounted doors which operate simultaneously
by means of a chain and turnbuckle linkage asĆ
sembly. Should field adjustment be necessary, the
two turnbuckles are located immediately behind
the combustion compartment cover. CAUTION:
the turnbuckles are located in a heat zone.
For units manufactured prior to August 1984.
1. Adjust one turnbuckle, then the other until the
doors are properly synchronized.
NOTE: The doors are properly adjusted if the
right door is fully closed when the left
door (the door with the handle) has beĆ
tween 1/2 and 1 inch of travel remaining.
Both turnbuckles must be adjusted to prevent
strain on the door operating mechanism.
2. Tighten the turnbuckle lock nuts.
Turnbuckle
(not shown)
For units manufactured after August 1984
Be sure the doors are in line with each other when
viewed from the top and front. If the doors are misaĆ
ligned adjust as follows:
1. Remove the bottom trim.
2. Loosen the five (5) bolts in the UĆshaped lower
door hinge and sprocket assembly.
3. Slide the assembly until the doors are aligned.
4. Tighten the bolts.
5. Replace the bottom trim.
Door Hinge
Sprocket
Assembly
Turnbuckle
Turnbuckle
FIGURE 1
To adjust the ball plunger catch:
1. Insert a spanner key in the notches on both
sides of the ball plunger. Loosen the lock nut
with a wrench.
2. Adjust the ball plunger by turning left or right
with the spanner key until the plunger engages
in the striker plate on the door.
3. With the spanner key still inserted in the ball
plunger notches, tighten the lock nut.
FIGURE 2
To adjust the doors for proper operation, open the
doors until the right hand door back flange is even
with the front line of the oven as viewed from above.
The left hand door should be positioned so the
door pressure lock touches the right hand door. If
the doors need adjustment proceed as follows:
1. Loosen the chain drive.
2. Adjust for proper location.
3. Tighten the chain drive.
Front of Oven
Left
Door
Right Door
Pressure Lock
FIGURE 3
3-1
Page 34
CALIBRATION AND ADJUSTMENT
DOOR BLOWER SWITCH
The door activated blower switch should be adĆ
justed so the doors are about 1Ć1/2" (4 cm) from
the liner when the switch shuts the blower off. If
field adjustment is necessary, the switch can be
reached by removing the combustion compartĆ
ment cover.
1. Open the right hand door until it is approxiĆ
mately 2" (5 cm) from the liner.
2. Place the arm of the cam assembly, located on
the door sprocket, against the push button.
3. Tighten the set screw.
When the doors are fully closed, the cam arm deĆ
presses the push button enough to allow blower
operation. An audible click will determine if the
switches are operating correctly.
The switch may be moved forward or backward in
the mounting bracket as necessary for alignment.
Door Arm
Sprockets
THERMOSTAT
DFG BULB AND CAPILLARY THERMOSTAT
For units with rocker style switches
1. Turn the mode selector/power switch to COOK
ONLY.
2. Toggle the blower switch to ON.
3. Toggle the cool down switch to MANUAL.
4. Place a pyrometer thermocouple or reliable
mercury thermometer on the middle shelf 6"
from the front edge and in the center of the
shelf.
5. Turn the thermostat dial to 350_F (177_C).
6. When the red indicator light on the control panĆ
el goes out, check the thermometer or pyromĆ
eter to determine oven temperature.
If this reading is within 10_F (6_C) of the therĆ
mostat setting, do not change the thermostat.
If this reading differs more than 10_F (6_C) from
the thermostat setting recalibrate the thermostat.
For units with rotary mode selector switch
Door
Chain
Door Switch
Cam Assembly
Hinge Pin
FIGURE 4
Micro
Switch
1. Turn the selector switch to COOK.
2. Place a pyrometer thermocouple or reliable
mercury thermometer on the middle shelf 6"
from the front edge and in the center of the
shelf.
3. Turn the thermostat dial to 350_F (177_C). Let
the oven heat for at least 1/2 hour.
4. When the red indicator light on the control panĆ
el goes out, check the thermometer or pyromĆ
eter to determine oven temperature.
If this reading is within 10_F (6_C) of the therĆ
mostat setting, do not change the thermostat.
If this reading differs more than 10_F (6_C) from
the thermostat setting recalibrate the thermostat.
Refer to page 3-3.
3-2
Page 35
DFGĆ100 and DFGĆ200
CALIBRATING THE THERMOSTAT
Bulb and Capillary Style Thermostat
1. Loosen the set screws in the thermostat knob.
Pull the knob forward.
2. With a screwdriver, turn the small screw loĆ
cated in the center of the thermostat stem eiĆ
ther clockwise to lower the temperature or
counterĆclockwise to raise the temperature.
NOTE: Do not allow the main stem of the therĆ
mostat to turn when adjusting the calĆ
ibration screw.
Solid State Analog Thermostat
1. Place a pyrometer thermocouple or reliable
mercury thermometer on the middle shelf 6"
from the front edge and in the center of the
shelf.
2. Turn the thermostat dial to 350_F (177_C).
3. When the red indicator light on the control panĆ
el goes out, check the thermometer or pyromĆ
eter to determine oven temperature.
NOTE: If adjustments are need locate the adjustĆ
ment pot on the solid state temperature
control board. Turn the pot to raise or lower
the temperature.
Calibration
Screw
3-3
FIGURE 5
Page 36
BURNERS
CALIBRATION AND ADJUSTMENT
Check the rating plate for proper orifice size and
correct pressure regulator for the type of gas
supplied. If different, the oven must be converted
to the correct type of gas before operation. Do not
attempt to operate the oven until corrected for
the gas supplied.
Check the gas pressure at the manifold with a maĆ
nometer or pressure gauge. Make certain that othĆ
er equipment on the gas line is ON.
1. Gas pressure at the manifold should be 3.5"
W.C. (0.87 kPa) for natural gas, and 10" W.C.
(2.50 kPa) for propane with burners operating
at full demand.
2. Adjust primary air shutters at the front of the
burner to obtain a stable and quiet flame.
Too little primary air will create yellow tipping or all
yellow flames. This indicates incomplete combusĆ
tion and may produce carbon sooting on metal
parts near the flame.
When a flame raises off the burner it is important to
determine if it is a lifting flame or a floating flame.
Lifting flames:
Lifting flames rise and burn some distance above
the ports. In some cases these flames will drop
back to the port and lift again intermittently. They
are well defined, hard, and may make a blowing
noise. They are caused by too much primary air.
Decrease the shutter opening to correct the condiĆ
tion.
Floating flames:
Floating flames are long, lazy, poorly defined, quiet
flames which roll around the combustion chamber
sometimes completely off the ports. Floating
flames result from too little secondary or makeĆup
air. Lack of secondary air can be caused by incorĆ
rect venting, blocked flue ways, blocked secondĆ
ary air inlet openings or lack of natural room makeĆ
up air to the oven.
Both of these conditions are unacceptable and reĆ
quire prompt corrective action.
Steel Tube Burners
Manifold
Locknut for
Air Shutters
Air
Shutters
Attach manometer here
FIGURE 6
3-4
Page 37
DFGĆ100 and DFGĆ200
SOLID STATE MANUAL
1. Place a pyrometer in the center of the oven.
2. Turn the mode selector switch to cook.
3. Turn the thermostat to 350_F (177_ C).
4. When the red indicator light goes out, check
the pyrometer to determine oven temperature.
5. If this reading is within 10_ (6_C) of the thermoĆ
stat setting no adjustment is needed.
If the reading is greater than 10_ (6_C) adjust
as follows:
A.) Locate the trim pot on the solid state temĆ
perature board.
B.) Turn the adjustment screw to raise or lower
the setting.
LIGHT OFF
OVEN READY
THERMOSTAT
TIMER
3-5
FIGURE 7
Page 38
SELECTOR SWITCH CALIBRATION
CALIBRATION AND ADJUSTMENT
1. Place a pyrometer in the center of the oven.
2. Turn the mode selector switch to cook.
3. Set 8 position selector switch to one of the
eight positions.
NOTE: The 8 individual positions are each set
for a temperature of the customer's
choosing. For example, if position 1 is
set for 350_F (177_ C) the red indicator
light should go out when it gets to withĆ
in 10 degrees of setpoint.
4. If the light goes out within 10 degrees, no adĆ
justment is required. If the light does not go out
within 10 degrees of setpoint calibrate the
switch as follows:
A.) Locate the potentiometer on the 8 position
selector switch labeled R1.
NOTE: There are 8 trim pots on this device.
They are labeled R1, R2, R3, etc.
B.) Turn the brass screw on top of the potenĆ
tiometer clockwise to increase the temperaĆ
ture. Turn the brass screw on top of the poĆ
tentiometer counterĆclockwise to decrease
the temperature.
5. Repeat steps 3-4 for all 8 positions.
NOTE: It is possible for all 8 positions to be out
of calibration but highly unlikely.
FIGURE 8
3-6
Page 39
DFGĆ100 and DFGĆ200
INTELLITOUCH CONTROL SECOND LEVEL PROGRAMMING
To access 2nd level programming
1. Turn the oven off.
2. Locate the 3 pin header on the bottom right
side of the control. Move the jumper from the
middle and bottom pins to the middle and top
pins exposing the bottom pin.
3. Turn the oven on. The program LED (1) lights.
Programming the 2nd level parameters
1. The #1 LED illuminates.
NOTE: The LED's (3) are located next to the
product and load keys. The LED identiĆ
fication numbers (2) are located to the
left of the product and load keys. See
FIGURE 9.
INTELLITOUCH
HEAT PROGRAM
DISPLAY
PROD
1
PROD
2
PROD
3
PROD
4
PROD
5
PROD
6
PROD
7
READY
8
LOAD
9
ENTER
TEMP
CNCL
TEMP
TIME
LOAD
0
LOAD
LOAD
R
LOAD
R
FIGURE 9
1
2
3
4
5
2
1
3
2
3
4
5
6
7
1
2
3
5. Repeat steps 1Ć3 for each parameter. When
the final parameter setting is entered and
saved the #1 LED illuminates.
LED(s) Parameter Setting
1 Offset 0
2 Hrs/Min timer 0F
1,2 Fahrenheit (0=_F, <1=_C) 0F
3 Proportional 0F
1,3 Integration 1F
2,3 Dead band 3F
1,2,3 Cycle time 12F
4 Minimum on time 3F
1,4 Hi temp alarm 550F
2,4 Ready temp differential 15F
1,2,4 Minimum setpoint 150F
3,4 Maximum setpoint cook 500F
1,3,4 Minimum setpoint hold 0F
2,3,4 Maximum setpoint hold 0F
1,2,3,4 Fan 2 speed 0F
5 Fan rev. 0F
TABLE 2
To exit the 2nd level programming
1. Turn the oven off.
2. Move the jumper from the middle and top pins
to the middle and bottom pins exposing the
top pin.
3. Turn the oven on.
2. Use the product and load keys to enter numeriĆ
cal data. See TABLE 2 for correct parameter
settings.
NOTE: Use product keys 1Ć7 for numerals 1Ć7.
Use load keys 1Ć3 for numerals 8,9 and
0 respectively.
3. Press the enter key to save the parameter setĆ
ting.
4. The #2 LED illuminates
Error codes
HELP the temperature setting exceeds the maxiĆ
mum setting of 550_F. This will be shown as
an alternating HELP and PROB display.
PROB 1. Defective temperature probe.
2. Stripped insulation on probe wires.
3. Poor connection of probe terminals.
4. Probe sensing temperatures above or
below the probe sensing range.
8888 an Intellitouch computer failure.
3-7
Page 40
CALIBRATION AND ADJUSTMENT
SOLID STATE DIGITAL SECOND LEVEL PROGRAMMING
NOTE: Refer to page NO TAG for illustration of
control.
To Initiate Programming
1. Set the time to 1 minute.
2. Set the temperature to 151_F (66_C).
To Access Second Level Programming
1. Press and hold the TEMPERATURE key and
the START/STOP key simultaneously.
2. The control beeps and displays the software
version for a few seconds.
3. The control then displays . The control has
entered the second level program.
To Change the Temperature Offset
1. Press the TEMPERATURE key.
2. The control displays or offset for a few secĆ
onds. It then displays the current offset which
should be 0_ F or .
3. Rotate the DIAL to enter a 50_F (28_C) offĆ
set. Use this to calibrate the oven if necessary.
To Set the Display Scales
1. Press the TEMPERATURE key.
2. The control displays the current setting from
the menu to the right. This menu controls 3
separate parameters:
C.) The desired temperature scale (ie Celsius
or Fahrenheit)
D.) Electric or Gas oven
E.) The desired time display (ie hrs/min or
min/sec)
3. To adjust the setting turn the DIAL 1 click at a
time.
0:01 01:00
SETTING THE DISPLAY SCALES
DIGITS
ST
1
H = Hrs/Min Display (Factory Setting)
_Ă = Min/Sec Display
To Return to Normal Operating Mode
1. Press the TEMPERATURE key.
2. The control goes through self check then disĆ
plays the set temperature 151_F (66_C).
3. The oven can now be controlled as normal.
ND
2
E = Electric Oven
_ = Gas Oven
RD
3
_C or _F
Temperature Display
FIGURE 10
4
TH
3-8
Page 41
DFGĆ100 and DFGĆ200
INTELLITOUCH II SECOND LEVEL PROGRAMMING
COMPUTERS WITH ON/OFF KEY IN CONTROL
1. Place the control in OFF mode.
2. Press the CLEAR key.
3. Press the B, A, K, and E keys followed by the
PROG/ENTER key.
4. The display reads ACCES S.
5. Input the relevant code from TABLE 3.
6. Press the PROG/ENTER key.
7. Press CLEAR CLEAR CLEAR to exit.
COMPUTERS WITHOUT ON/OFF KEY
1. Place the control in SELECT mode.
2. Press the 1, 2, 3, 4, 5, 6 keys follows by the
PROG/ENTER key.
3. The display reads ACCES S.
4. Input the relevant code from TABLE 3.
5. Press the PROG/ENTER key.
6. Press CLEAR CLEAR CLEAR to exit.
ALL CONTROLS
Temperature display scale
1. The display flashes _ F/_C then MODE-?
2. Press any key to toggle the scale from _F to _C.
3. Press the PROG/ENTER key to lock in new
scale.
4. The display flashes T'_F ( or T'_C).
Ready Band
1. The display flashes READY, BAND and POS.
2. Use the numeric keys to enter a value between
1 and 25. Press the PROG/ENTER key.
3. The display flashes READY, BAND and NEG.
4. Use the numeric keys to enter a value between
1 and 25. Press the PROG/ENTER key.
To exit oven calibration
1. The display flashes ACCESS, DONE and EXIT.
2. Press CLEAR, CLEAR, CLEAR.
3. The display flashes REBOOT and SELECT.
Access Codes
123 Display model, version, date and checksum of firmware
000 STD unit test
CLEAR, TEMP, TEMP, TEMP, PROG/ENTER Temperature offset (+/-)
Ready band offset (+/-)
TABLE 3
3-9
Page 42
CALIBRATION AND ADJUSTMENT
INTELLIPLUS SECOND LEVEL PROGRAMMING
NOTE: Time must be zeroed out in order to perĆ
form the following functions.
SETTING A TEMPERATURE OFFSET
1. Set the temperature dial to 210_.
2. Push and hold the CANCEL and START TIMER
keys until the display reads 000.UPO
3. Enter the desired offset.
4. Push the ACTUAL TEMP key.
FAHRENHEIT TO CENTIGRADE CONVERSION
1. Set the temperature dial 220_.
2. Push and hold the START TIMER until the disĆ
play reads CCC_.
3. Enter the desired temperature.
4. Push the ACTUAL TEMP key.
CHANGING MINUTES TO SECONDS OR
HOURS TO MINUTES
1. Set the temperature dial to 230_.
2. Push and hold the START TIMER until the disĆ
play changes from MIN to HR.
3. Push the ACTUAL TEMP key.
3-10
Page 43
DFGĆ100 and DFGĆ200
BLODGETT IQ2T CONTROL FACTORY LEVEL PROGRAMMING
Entering the programming mode
1. Press the program key. The top display reads
CodE.
2. Use the product keys to enter the factory proĆ
gramming accss code: 4 5 2 3. Press the enter
key. The top dislay reads Fact.
Programming the oven configuration
1. Press the SCAN KEY. The display rads Appl.
2. Press the TOGGLE/CLEAR KEY to toggle beĆ
tween electric oven and gas oven. Set the
choice for the oven type. Press the SCAN KEY
to enter the choice.
3. Press the TOGGLE/CLEAR KEY to toggle beĆ
tween half sized or full sized oven. Set the
choice for the oven type. Press the SCAN KEY
to enter the choice.
NOTE: Mark V and DFGĆ100 are full sized
ovens. CTB and DFGĆ50 are half sized
ovens.
Programming the temperature offset
1. The top display reads oFF. The bottom display
reads SEt.
2. Press the SCAN KEY. The top display reads oFST.
The bottom display reads either xxF or -xxF.
3. Press the TOGGLE/CLEAR KEY to toggle beĆ
tween positive and negative. Use the product
keys to the enter the desired temperature offset.
4. Press the SCAN KEY to enter the new temperaĆ
ture offset.
Enabling/Disabling the fan error detection circuit
1. The top display reads FanC. The bottom disĆ
play reads YES or NO.
2. Press the TOGGLE/CLEAR KEY to toggle beĆ
tween choices.
3. Press scan to move to next operating parameĆ
ter.
Programming fan speed option
1. The top display reads FanS. The bottom disĆ
play reads 1 or 2.
2. Press the TOGGLE/CLEAR KEY to toggle beĆ
tween choices: 1 for a single speed motor or 2
for a two speed motor.
3. Press SCAN to move to the next operating paĆ
rameter.
Programming the maximum temperature setpoint
1. The top display reads tELt (temperature limit)
and the bottom display reads either 500 or 550.
2. Press the TOGGLE/CLEAR key to toggle beĆ
tween choices 500_F or 550_F maximum temĆ
perature setting.
3. Press scan to enter the maximum setpoint
temperature.
NOTE: Use 500_F for the DFGĆ100, DFGĆ200,
Mark V, CTB and DFGĆ50. Use 550_F
for the DFGĆ100 XCEL and Mark V
XCEL.
Exiting the factory programming mode
1. The top display reads Fact. Press the PROG
KEY. The control returns to the operating
mode.
3-11
Page 44
CHAPTER 4
PARTS REPLACEMENT
Page 45
REMOVAL AND REPLACEMENT OF PARTS
ACCESS PANELS AND DOORS
WARNING
Before performing any maintenance or
replacing any component on this unit,
disconnect the oven from its electrical
source and shut off the gas supply.
If it is necessary to replace a defective
component, use only genuine Blodgett
OEM replacement parts.
COMBUSTION COMPARTMENT COVER
1. Open the doors.
2. Remove the two (2) screws in the top edge of
the panel.
3. Lift the panel up and outward.
4. Replace by reversing the above procedure.
CONTROL COVER
1. Remove combustion compartment cover.
2. Remove the screw in the top of the control cover.
3. Pull the bottom of the control cover forward,
down and off.
4. Replace by reversing the above procedure.
To p
Screw
Control Cover
Combustion
Cover
FIGURE 2
FIGURE 1
4-1
Page 46
DFGĆ100/DFGĆ200
PERIMETER DOOR GASKET
1. Remove gasket screws.
2. Remove all door gaskets and top and bottom
trim pieces.
NOTE: Side trim pieces remain in place.
3. Position the top gasket over the upper trim
piece. Replace the screws.
4. Position side gaskets 1/8" from the end of the
top gasket. Replace the screws.
5. Position the bottom gasket over the trim piece.
Top Perimeter
Gasket
CENTER DOOR GASKET
For ovens with 50/50 doors
1. Remove screws securing gaskets to the leadĆ
ing edge right and left doors. Remove the gasĆ
kets.
2. Place rigid stainless strip which has been
formed at a 90_ angle between the front and
back halves of the right hand door. Position
properly.
3. Align a 1/8" drill bit in the existing holes along
the edge of the door. Drill through the stainless
strip with formed sections to the outside.
4. Place the two (2) pieces of flexible gasket maĆ
terial sideĆbyĆside.
NOTE: The right door gasket has holes
punched in the center of the strip. The
left door gasket has holes punched
slightly to the left of center of the strip.
5. Place the right side gasket flush with the leadĆ
ing edge of the right door. Secure with four (4)
screws.
FIGURE 3
6. Place the left side gasket flush with the leading
edge of the left door assembly and secure.
7. Readjust the chain and turnbuckle assembly
to ensure that the doors operate properly.
NOTE: Refer to page 3-1 in the Calibration
and Adjustment section for door adĆ
justment.
Bottom Perimeter
Gasket
4-2
Page 47
REMOVAL AND REPLACEMENT OF PARTS
OVEN DOOR
1. Open the door. Remove the handle from the
left hand door.
2. Remove three (3) machine screws located
along the bottom edge of the door.
3. Lift the door slightly. Pull forward until it clears
the support.
4. Pull the door down to remove from the oven.
5. Replace by reversing the above procedure.
NOTE: For doors with wooden handle, the
handle is attached and is removed with
the door.
8. Position the glass in the frame with the black
border facing upward.
9. Replace the front frame assembly. Press firmly
until the screw holes around the edge of the
door are aligned.
10. Replace the screws, the center door gasket
and the door handle.
11. Reinstall the door on the oven.
WINDOW ASSEMBLY FOR OVENS
WITH 60/40 DOORS
1. Remove the door as described. Place the door
on a flat surface with the front facing up.
2. Remove the outer door skin. Turn the door
onto its back.
3. Use the window insertion tool to pry up the corĆ
ners of the window assembly in the following
order:
A.) Bottom right (farthest from the hinge pin)
B.) Bottom left
FIGURE 4
WINDOW ASSEMBLY FOR OVENS
WITH 50/50 DOORS
1. Remove the door from the oven.
2. Remove the door handle and center door gasket.
3. Place the door on a flat, clean surface. Remove
the screws around the edge of the door.
4. Remove the outer (front) door frame.
5. Remove the old glass assembly.
6. Clean the frame thoroughly.
7. Place the glass retainer bracket in each corner
of the back frame.
C.) Top right
D.) Top left (closest to the hinge pin)
NOTE: The window insertion tool is provided
with the window assembly.
4. Use the window insertion tool to pry up the corĆ
ners of the window assembly.
5. Reverse steps 1-4 to replace.
NOTE: To install the door front start at the corĆ
ner closest to the hinge pin.
Hinge Pin
Window
Insertion Tool
FIGURE 1
4-3
Page 48
DFGĆ100/DFGĆ200
LOWER DOOR HINGE AND SPROCKET
ASSEMBLY
For models manufactured prior to May 1986:
1. Remove the door from the oven.
2. Remove the rollĆpin securing the sprocket to
the hinge pin assembly.
3. Loosen the set screw. Lift the hinge pin assembly
upward to allow the removal of the sprocket.
4. Replace by reversing the above procedure.
For models manufactured after May 1986:
1. Remove the door from the oven.
2. Remove the rollĆpin securing the door arm to
the hinge pin assembly.
3. Remove the door switch activating the cam
from the right hand door.
4. Loosen the set screw. Lift the hinge pin assembly
upward to allow the removal of the sprocket.
5. Replace by reversing the above procedure.
DOOR CHAIN ASSEMBLY
If the replacement of the sprocket as well as the
chain is necessary, use the removal instructions for
Door Glass Removal. If only the door chain needs
to be replaced, remove as follows:
For units manufactured prior to August 1984.
3. After the chain is in position, adjust the chain
and turnbuckle as described on page 3-1 of
the Calibration and Adjustment section to obĆ
tain proper door synchronization.
For units manufactured after August 1984
Be sure the doors are in line with each other when
viewed from the top and front. If the doors are misaĆ
ligned adjust as follows:
1. Remove the bottom trim.
2. Loosen the five (5) bolts in the UĆshaped lower
door hinge and sprocket assembly.
3. Slide the assembly until the doors are aligned.
4. Tighten the bolts.
5. Replace the bottom trim.
Open the doors until the right hand door back
flange is even with the front line of the oven as
viewed from above. The pressure lock on the left
hand door should touch the right hand door. If not,
adjust as follows:
1. Loosen the chain drive.
2. Adjust for proper location.
3. Tighten the chain drive.
Front of Oven
Left
Door
Right Door
1. Unscrew the turnbuckle. Remove the chain asĆ
sembly from between the sprocket and frame
of the oven.
2. When viewed from the top, the rod from the left
sprocket passes over the rod from the right
sprocket in a figure eight pattern.
Door Arm
Hinge and
Sprocket
Assembly
Turnbuckle
Prior to August 1984
FIGURE 3
Pressure Lock
FIGURE 2
Door Hinge
Sprocket
Assembly
Turnbuckle
After August 1984
4-4
Page 49
REMOVAL AND REPLACEMENT OF PARTS
MOTOR AND BLOWER ASSEMBLY
BLOWER WHEEL
Blower Wheel with Build On Wheel Puller
1. Remove the racks and rack supports.
2. Remove the blower wheel cover by loosening
the baffle retaining screws located at each corĆ
ner. Pull cover forward.
3. Loosen set screws in blower wheel hub.
4. Screw a 3/8"Ć16 bolt into the threaded hole of
the blower wheel. Draw the wheel forward from
the shaft.
5. Lubricate the motor shaft with graphite. MainĆ
tain a gap between the back of the blower
wheel and the back wall of the oven liner.
6. Replace by reversing the procedure above.
NOTE: DO NOT lose the 3/16" square key.
Blower Wheel without Build On Wheel Puller
Use procedure above however, mechanic must
provide wheel puller.
MOTOR
1. Remove the blower wheel from the motor shaft.
If access to the rear of the oven is available:
1. Remove the motor attachment bolts.
2. Lift the motor from the mounting bracket.
3. Remove the motor conduit.
4. Replace by reversing the appropriate proceĆ
dure above.
If access to the rear of the oven is not available:
1. Remove the six (6) screws in the lower heat colĆ
lector.
2. Pull the lower heat collector forward and down.
3. Remove the two (2) 1/4" nuts from the motor
panel.
4. Pull the motor panel forward into the oven. DisĆ
connect the motor wiring conduit.
5. Replace by reversing the appropriate proceĆ
dure above.
Blower Wheel
Cover
Thumb Screw
Removing the Blower Wheel Cover Removing the Blower Wheel
Motor
Blower Wheel
Set Screw
FIGURE 4
4-5
Page 50
DFGĆ100/DFGĆ200
BURNER AND DEFLECTOR ASSEMBLIES
MANIFOLD AND BURNER ORIFICES
1. Remove the combustion compartment cover.
2. Remove the brass compression fitting at the
right end of the manifold.
3. Remove the two (2) screws securing the manĆ
ifold to the oven.
4. Move the manifold to the left and forward.
5. Remove the brass orifices.
6. Replace by reversing the above procedure.
Manifold
Brass Fitting
COMPARTMENT LINER BOTTOM
1. Remove the racks and rack supports.
2. Remove the blower wheel cover.
3. Remove the bottom perimeter door gasket.
4. Remove the screws securing the front, back
and sides of the liner bottom.
5. Pull the compartment liner bottom forward.
6. Replace by reversing the above procedure.
NOTE: All screws must be reinstalled to enĆ
sure proper seal in liner.
DEFLECTOR ASSEMBLY
1. Remove the racks and rack supports.
2. Remove the blower wheel cover.
3. Remove the compartment liner bottom.
4. Remove the screws securing the front and back
of the deflector.
5. Lift the deflector from the oven.
FIGURE 5
BURNERS
1. Remove the combustion compartment cover.
2. Remove the manifold assembly.
3. Remove the electric ignitor.
4. Pull the burners forward.
5. Replace by reversing the above procedure.
6. Replace by reversing the above procedure.
Compartment
Liner Bottom
Deflector
FIGURE 6
4-6
Page 51
REMOVAL AND REPLACEMENT OF PARTS
ELECTRIC IGNITER (GLOW COIL) AND PLUMBING COMPONENTS
ELECTRIC IGNITER
WARNING
The electric igniter is extremely brittle.
Care must be taken when handling the igĆ
niter to avoid breakage.
For models manufactured prior to August 1984:
1. Remove the combustion compartment cover.
2. Remove the two (2) screws securing the igniter
bracket to the left burner.
3. Remove the two (2) ceramic wire nuts connectĆ
ing the igniter. Remove the igniter from the
combustion compartment.
4. Replace by reversing the above procedure.
For models manufactured between August
1984 and January 1989:
1. Remove the combustion compartment cover.
2. Remove the two (2) ceramic wire nuts from the
wires connected to the igniter.
THERMAL DELAY RELAY ASSEMBLY
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward.
4. Remove the thermal delay relay assembly.
5. Replace by reversing the above procedure.
3. Remove the hair pin securing the igniter to the
bracket.
4. Remove the igniter from the bracket.
5. Replace by reversing the above procedure.
Igniter
Bracket
Steel Tube
Electronic
Igniter
FIGURE 7
Burners
4-7
Page 52
DFGĆ100/DFGĆ200
GAS PRESSURE REGULATOR
For models manufactured prior to August 1984:
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward for easier access to the regulator.
4. Shut off the gas supply to the oven by closing
the manual gas valve.
5. Remove the gas pressure regulator.
6. Replace the gas pressure regulator.
7. Open the manual gas valve. Check for gas
leaks using the soap test.
8. Light the oven. Check the gas pressure with
the burners in full demand condition.
NOTE: Gas pressure at the manifold should
be 3.5" W.C. for natural gas and 10"
W.C. for propane.
9. The regulator may be adjusted by turning the
adjustment screw clockwise to increase the
gas pressure or counterclockwise to decrease
the gas pressure.
SOLENOID VALVE
For models manufactured prior to August 1984:
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward for easier access to the solenoid valve.
4. Shut off the gas supply to the oven by closing
the manual gas valve.
5. Remove the solenoid valve.
6. Replace by reversing the above procedure.
(not shown)
Micro Switch
TDR Tube
Manual Gas
Shutoff Valve
Gas Pressure
Regulator
Regulating Screw
Solenoid Valve
FIGURE 8
4-8
Page 53
REMOVAL AND REPLACEMENT OF PARTS
CONTROL STACK ASSEMBLY
For models manufactured between August
1984 and January 1986:
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward for easier access to the control stack.
4. Close the manual gas valve in the rear of the
control area.
5. Disconnect the wire leads to the combination
dual gas valve.
6. Disconnect the two (2) control stack unions.
7. Remove the control stack assembly.
8. Replace by reversing the above procedure.
9. Open the manual gas valve. Check for gas
leaks.
10. Light the oven. Check the gas pressure with
the burners on.
NOTE: Gas pressure at the manifold should
be 3.5" W.C. for natural gas and 10"
W.C. for propane gas.
COMBINATION DUAL GAS VALVE
For models manufactured after August 1984:
1. Remove the control stack assembly.
2. Remove the combination dual gas valve from
the control stack assembly.
NOTE: The pressure regulator is part of the
combination dual gas valve.
3. Replace by reversing the above procedure.
4. Open the manual gas valve. Check for gas
leaks.
Micro Switch
Control Stack Union
Combination
Dual Gas Valve
Control Stack Union
FIGURE 9
4-9
Page 54
DFGĆ100/DFGĆ200
INTERMITTENT IGNITION DEVICE (IID) AND PLUMBING COMPONENTS
For units manufactured after January 1986
WARNING
Disconnect electrical power supply beĆ
fore wiring the control into the circuit to
avoid possible damage to the equipment.
Shut off all gas to the appliance by closing
the shutoff valve to the appliance.
PILOT BURNER AND SPARK IGNITION
1. Remove the combustion compartment cover.
2. Disconnect the nut for the manifold line at the
front of the combination dual gas valve.
3. Remove two (2) bolts which hold the manifold
to the brackets on the floor of the burner
compartment.
4. Disconnect the line from the proof of flame rod.
5. Disconnect the pilot line at the combination
dual gas valve.
IGNITION CONTROL AND
TRANSFORMER
NOTE: Ignition control for propane gas is supplied
with 100% lockout if no proof of ignition
within 25Ć45 seconds.
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward.
4. Remove the wires to the ignition control box.
5. Remove the ignition control box.
6. Remove the wires to the primary and seconĆ
dary terminals of the transformer.
7. Remove the transformer.
8. Replace by reversing the above procedure.
NOTE: Be sure to connect the high voltage cable
to the ignition transformer before turning
on power to the control to avoid possible
damage to the equipment.
6. Disconnect the high tension lead to the spark
electrode from the bottom of the ignition conĆ
trol box.
7. Remove the two (2) screws securing the pilot
burner to the bracket on the right hand main
burner.
8. Replace by reversing the above procedure.
Igniter
Bracket
Spark Igniter
FIGURE 10
4-10
Page 55
REMOVAL AND REPLACEMENT OF PARTS
CONTROL STACK ASSEMBLY
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward for easier access to the control stack.
4. Shut off main gas supply to the oven.
5. Disconnect wire leads to the combination dual
gas valve.
6. Disconnect the pilot line from the gas valve.
7. Disconnect the nut for the manifold line at the
front of the gas valve.
8. Disconnect rear control stack union.
9. Remove the control stack assembly.
10. Replace by reversing the above procedure.
11. Open the manual gas valve. Check for gas
leaks.
12. Light the oven. Check the gas pressure with
the burners on.
NOTE: Gas pressure at the manifold should
be 3.5" W.C. for natural gas and 10"
W.C. for propane gas.
COMBINATION DUAL GAS VALVE
1. Shut of main gas supply to the oven.
2. Remove the control stack assembly.
3. Remove the combination dual gas valve from
the control stack assembly.
NOTE: The pressure regulator is part of the
combination dual gas valve.
4. Replace by reversing the above procedure.
5. If adjustments to regulator are necessary be
sure to reinstall the regulator cap. The cap acts
as a flow limiter in the event of a ruptured diaĆ
phragm.
6. Open the manual gas valve. Check for gas
leaks.
Micro Switch
Control Stack
Union
Control Stack Union
Regulator Cap
Combination Dual
Gas Valve
FIGURE 11
4-11
Page 56
DFGĆ100/DFGĆ200
ELECTRICAL COMPONENTS
NOTE: A test cord is available to allow removal of
the control module from the oven while reĆ
taining electrical connections.
BULB AND CAPILLARY THERMOSTAT
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Remove the oven racks.
4. Remove the thermostat capillary bulb clips.
5. Swing the capillary bulb forward until it is at a
90_ angle with the liner side.
6. Close the doors. Pull the control module forĆ
ward.
7. Remove the wires from the thermostat.
8. Loosen the set screw at the bottom of the therĆ
mostat knob. Remove the knob.
9. Remove the two (2) screws securing the therĆ
mostat to the front panel.
10. Feed the capillaries through the oven wall and
the side of the control module.
ELECTRICAL COMPONENTS LOCATED
IN THE CONTROL MODULE
1. Remove the combustion compartment cover.
2. Remove the control compartment cover.
3. Close the doors. Pull the control module forĆ
ward.
4. Remove the wires from the defective compoĆ
nent.
5. Loosen the screws attaching the component
to the control module.
Switches may be removed by depressing the
spring loaded clips.
The one hour timer is removed by loosening
the locknut.
6. Replace by reversing the above procedure.
NOTE: Refer to the wiring diagram at the rear
of the oven to ensure correct connecĆ
tion of the wires.
DOOR SWITCH
11. Remove the thermostat.
12. Replace by reversing the above procedure.
NOTE: Be careful not to kink the fine tubing of
the thermostat capillary.
Capillary
Tube
FIGURE 12
1. Remove the combustion compartment cover.
2. Remove the wires from the door switch.
3. Remove the screws securing the door switch
to the bracket.
4. Replace by reversing the above procedure.
NOTE: Refer to Door Blower Switch adjustĆ
ments on page 3-2 of the Calibration
and Adjustment section to assure
proper operation prior to replacement
of the combustion compartment cover.
4-12
Page 57
CHAPTER 5
TROUBLESHOOTING
Page 58
DFGĆ100 and DFGĆ200
HEAT HSI SYSTEM
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #1 - Heat and motor do not operate
D Oven not plugged in.
D Doors are open.
D Door switch is inoperable.
D Mode selector switch is not set to cook.
D Circuit breaker tripped.
D If control configuration has standard fan delay
D Plug in power cord.
D Close doors tightly.
D Check door switch for continuity.
D Turn mode selector switch to cook.
D Reset breaker.
D Deactivate the fan delay feature.
pulse plus feature, this feature may be activated.
D If control configuration has solid state digital conĆ
D Deactivate the feature.
trols with cycle or pulse feature, this feature may
be activated.
D Convection motor out due to thermal overload.
D Check for external heat against the motor. Such
as improper flue connectors on double stack
ovens. Check for overamping of the motor.
D Mode selector switch is inoperable.
D Replace switch.
Symptom #2 - Convection fan motor does not operate in any mode
D Oven is not plugged in
D Oven not set to cook mode.
D Circuit breaker tripped.
D Plug in oven.
D Turn oven mode switch to on.
D Reset circuit breaker and check the amp draw.
Reference electrical specifications on page 1-1
of the Introduction.
D Door switch inoperative.
D Motor off due to thermal overload.
D If control configuration has standard fan delay
pulse plus feature, this feature may be activated.
D If control configuration has solid state digital conĆ
trols with pulse or cycle feature, this feature may
be activated.
D Mode selector switch is inoperable.
D Replace door switch.
D Check for external heat on the motor.
D On double stacked units check that the flue conĆ
nector is properly installed.
D Check the amp draw. If too high, replace the moĆ
tor.
D Deactivate fan delay pulse plus feature.
D Deactivate the pulse or cycle feature.
D Replace switch.
5-1
Page 59
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #3 - Heat system does not recover quickly
TROUBLESHOOTING
D Gas pressure not correct.
D Oven out of calibration.
D Incorrect orifice size.
Symptom #4 - Motor operates but there is no heat
D Temperature control set below actual temperature.
D Transformer inoperative.
D Centrifugal switch is inoperative.
D Convection fan is inoperative.
D Ignition control is inoperative.
D Gas valve is inoperative.
D Temperature probe shorted or open.
D Refer to rating plate for correct gas pressure.
D Reference the calibration procedures for the conĆ
trol configuration on your appliance.
D Drill or replace the orifice for correct gas and
elevation.
D Increase the setpoint temperature.
D Determine if there is 115VAC primary and 24VAC
secondary. If there is primary voltage but no secĆ
ondary voltage replace the transformer.
D If transformer is good reference wiring diagram
provided to locate wires to centrifugal switch. ReĆ
move wires from switch. With motor at full speed
measure for continuity of switch. If no continuity
replace the motor.
D Determine if 115VAC is supplied to motor when
oven is turned on. If not replace the convection
motor.
D Refer to Blodgett Technical Supplement docuĆ
ment for information.
D Check for 24VAC. If present replace gas valve.
D Take the resistance reading. Reference pages
5-6 for probe resistance information. Refer to
page 2-4 for wiring diagram P/N 20027.
For solid state manual controls, remove the wires
on terminals #6 and #7 on the solid state board.
Touch the wires together to allow the ignition conĆ
trol to power up. If the ignition control powers up,
the problem is in the temperature control circuit
(consisting of the board, probe and potentiomeĆ
ter). This is only a test. DO NOT leave the oven
during this test.
If the ignition control fires up place an ohm meter
across the probe wire. Note the resistance readĆ
ing of the probe as the temperature in the oven
increases. At no time should the probe go infinite
or open before the oven reaches 500_F (260_C).
If it does the probe is bad and should be reĆ
placed.
5-2
Page 60
DFGĆ100 and DFGĆ200
FLOW DIAGRAM
Heat is not
operational
Raise thermostat
above ambient
temperature
Replace
mode switch
If no secondary
replace transformer
No
No
No
Is
convection motor
operational?
Yes
Is
thermostat calling
for heat?
Yes
Is
110VAC on
primary side of
transformer?
Yes
Is
24VAC on
secondary side of
transformer?
Yes
No
Is
mode switch
sending 110VAC to
door switch?
Yes
Are doors
closed?
Yes
Is door
switch
operational?
Yes
Replace
motor
No
No
No
Replace
mode switch
Close doors
Replace
door switch
Check centrifugal switch
in convection motor, replace
motor if switch is defective
Check thermostat circuit
for bad probe, board,
potentiometer or controller
No
No
Is
24VAC applied
to terminal #6 of
ignition control
module?
Yes
Is
24VAC applied
to terminal #2
of ignition
control?
Yes
Go to
A
5-3
Page 61
A
Is
ignition control
sending a spark
to the pilot
burner?
Yes
No
TROUBLESHOOTING
Replace ignition
control module
Is
pilot light
igniting?
Yes Yes
Is
main valve
igniting?
Yes Yes
System
check OK
No
No
Is 24VAC
applied to the coil
of pilot
valve?
Replace
gas valve.
Are
microamps
greater than
.15?
Replace
gas valve
No
No
Replace ignition
control module
Clean pilot or
check for low
gas pressure
FIGURE 1
5-4
Page 62
DFGĆ100 and DFGĆ200
DISPLAY ERROR CODES
INTELLITOUCH
HELP the temperature setting exceeds the maxiĆ
mum setting of 550_F. This will be shown as
an alternating HELP and PROB display.
PROB 1. Defective temperature probe.
2. Stripped insulation on probe wires.
3. Poor connection of probe terminals.
4. Probe sensing temperatures above or
below the probe sensing range.
8888 an Intellitouch computer failure.
INTELLIHOLD AND INTELLIPLUS
F2 Actual oven temperature is greater than the
maximum temperature setpoint
F3 Open temperature sensor
F4 Shorted temperature sensor while the conĆ
trol is in the cook mode.
F6 The 50/60 Hz input does not change states.
F7 Total chain timer over 24 hours
F8 The calculated EEPROM check sum is not
the same as the expected check sum reĆ
trieved from the EEPROM.
BLODGETT IQ CONTROL
NOTE: The error codes will appear in the top disĆ
play. All error codes are accompanied by
an audible alarm.
Hi Oven temperature is more than 40_F
above the highest setpoint.
Prob Probe failure at greater than 693_F.
Probe (with alarm) - shorted temperture
probe.
HEAT ERR From a cool start (below 140_F), the
oven takes more than 10 minutes to
climb from 150Ć300_F.
FAN ERR Control thinks motor is not operating
FAN C ERR usually occurs when dirt or grease
collects on the veins of the blower
wheel causing centrifugal switch to
remain closed too long.
5-5
Page 63
PROBE RESISTANCE VS TEMPERATURE
TROUBLESHOOTING
Solid State Manual and Digital Controllers
(probe P/N 18588)
_F _C Ohms _F _C Ohms
100 38 53029 310 155 1519
125 52 30785 320 160 1340
150 66 18591 330 166 1186
175 80 11633 340 171 1052
200 93 7528 350 177 936
210 99 6391 360 182 835
220 105 5471 370 188 747
230 110 4705 380 193 669
240 116 4030 390 199 601
250 121 3441 400 205 542
260 127 2967 425 219 421
270 132 2583 450 232 333
280 138 2255 475 246 265
290 143 1970 500 260 216
300 149 1728
Intellitouch II Controller
(probe P/N 32289)
_F _C Ohms _F _C Ohms
32 0 500 212 100 693
68 20 539 250 120 730
75 24 545 300 150 787
86 30 558 356 180 842
125 50 597 392 200 879
140 60 616 450 230 934
175 80 655 500 260 989
200 93 680 554 260 1042
TABLE 1
TABLE 2
5-6
Page 64
DFGĆ100 and DFGĆ200
Intellitouch (probe P/N 20360) and
Blodgett IQ Controllers (probe P/N 33074
_F _C Ohms _F _C Ohms
60 16 1059 235 113 1422
65 18 1067 240 116 1432
70 21 1080 245 118 1442
75 24 1090 250 121 1453
80 27 1099 255 124 1463
85 29 1112 260 127 1473
90 32 1122 265 130 1483
95 35 1133 270 132 1493
100 38 1143 275 135 1503
105 41 1153 280 138 1514
110 43 1164 290 143 1534
115 46 1174 295 146 1544
120 49 1185 300 149 1554
125 52 1195 305 152 1564
130 55 1206 310 155 1574
135 57 1216 315 157 1584
140 60 1226 320 160 1594
145 63 1237 325 163 1604
150 66 1247 330 166 1614
155 68 1258 335 169 1624
160 71 1268 340 171 1634
165 74 1278 345 174 1644
170 77 1289 350 177 1654
175 80 1299 355 180 1664
180 82 1309 360 182 1674
185 85 1320 365 185 1684
190 88 1330 370 188 1694
200 93 1350 375 191 1704
205 96 1361 380 193 1714
210 99 1371 385 196 1724
215 102 1381 390 199 1734
220 105 1391 395 202 1744
225 107 1402 400 205 1754
230 110 1412 405 207 1764
Intellitouch (probe P/N 20360) and
Blodgett IQ Controllers (probe P/N 33074
_F _C Ohms _F _C Ohms
410 210 1774 460 238 1872
415 213 1783 465 241 1882
420 216 1793 470 244 1892
425 219 1803 475 246 1901
430 221 1813 480 249 1911
435 224 1823 485 252 1921
440 227 1833 490 254 1931
445 230 1843 495 255 1940
450 232 1852 500 260 1950
455 235 1862
TABLE 3
5-7
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