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Service Manual XLT TS Series Conveyorized Oven

XD9011-TS Rev C - 05/2008 © 2008 BOFI Inc.

BOFI™ P.O. Box 9090

Wichita, KS 67277-0090

Phone: 1-316-943-2751 Fax: 1-316-943-2769

www.xltovens.com

2 XLT TS Series Service Manual

XLT TS Series Service Manual 3

WARNING & SAFETY INFORMATION FOR YOUR SAFETY

Do not store or use gasoline or other flammable

liquids or vapors in the vicinity of this or any other appliance.

WARNING: Improper installation, adjustment, alteration, service or maintenance

can cause property damage, injury, or death. Read the installation, operating and

maintenance instructions thoroughly before installing, using, or servicing this

equipment.

WARNING: In the event a gas odor is detected, shut off the gas at the main shutoff

valve immediately. Contact your local Gas Company or supplier.

WARNING: Disconnect electrical input power to the unit before performing any

maintenance.

Before trouble-shooting the oven, make sure that the oven is plugged in to a

120VAC electrical power outlet. Check to see that the breaker hasn’t been tripped. The

circuit should be a 20 amp circuit. Sometimes it is helpful to measure the voltage at the

outlet or plug a light into the outlet to verify the power. All fuses should be checked.

The fuse caps are the quarter turn bayonet style. Use a continuity checker on removed

fuses if a visual inspection is indeterminate. Fuses are used to protect both the inputs and

outputs of each particular device.

Also check to see if the gas supply is adequate. The 3/4" gas hose should be

connected to the oven and the shutoff valve fully opened. Make sure that the quick-

disconnect is properly connected. A full flow style shutoff valve (with pressure tap)

should be used and the gas pressure should be measured. For proper operation, the gas

inlet pressure to the oven must stay between 8.0" to 12.0" WC for natural gas and 11.0"

to 14.0" WC for propane gas. Measure the gas pressure with all gas appliances off, such

as furnace, hot water heater, ovens, etc. and all gas appliances on. See the Rough-In

section in the Installation and Operation Manual for layout details. Also remember that

anytime the gas hose has been disconnected, it will take time to purge the air from the gas

train.

Finally, check to see that the oven is fully assembled. All of the fingers must be

properly installed. Incorrect or incomplete finger placement can cause a “windy”

condition that can cause the pilot or burner not to light, similar to a cigarette lighter

outside on a windy day.


Table of Contents Description .......................................................................................................................... 5

Operation............................................................................................................................. 5

Fan Subsystem..................................................................................................................... 6

Fan Subsystem Trouble-Shooting ....................................................................................... 6

Burner Subsystem ............................................................................................................... 7

Combustion Blower Trouble-Shooting ............................................................................. 12

Modulating Valve and Signal Conditioner Trouble-Shooting .......................................... 12

Temperature Control Trouble-Shooting............................................................................ 13

Instruction to switch from Fahrenheit to Celsius readout ................................................. 17

Conveyor Subsystem......................................................................................................... 18

Conveyor Control Trouble-Shooting ................................................................................ 19

Dart MD10P Controller Programming Procedure ............................................................ 20

Conveyor Belt ................................................................................................................... 21

Electrical Schematics ........................................................................................................ 35


Description

XLT Ovens consist of 3 basic subsystems: the Fan, Burner and Conveyor

subsystems. All of the ovens have 3 switches, which turn each of these on. The fan

switch supplies power to the burner and conveyor switches, so it must be turned on first.

Note that the 3270 ovens have an additional control box on the left side of the oven. This

oven can be controlled from either side, but the opposite side set of switches must be left

on. The Parts Manual shows part locations and exploded views.

The fan switch supplies power to the oven fan motor, the control box cooling fan,

the cool-down timer relay, the temperature control, the burner switch, and the conveyor

switches. The cool-down relay timer is connected to power when the oven is plugged in

and provides 30 minutes of power to the oven fan after the fan switch is turned off. The

oven fan has an internal centrifugal switch that completes the circuit to the burner blower

motor. The burner blower motor in turn has an internal centrifugal switch that completes

the circuit to the burner ignition control.

The burner switch applies power from the fan switch to the oven fan motor

centrifugal switch. The conveyor switch applies power from the fan switch to the

conveyor control. See the electrical schematics.

There are a few differences between the natural gas model ovens and the propane

(LP) gas models. Electrically they are the same. The burner orifice, modulating valve,

and combination gas valves are different for the two models. The propane models have

smaller burner orifices and higher gas pressure ranges. See the A4200 burner drawing in

the Parts Manual for orifice size information. The modulating valves have different

internal coils and are marked M420B for natural gas and M420BH for propane. The

combination gas valves are field convertible (Honeywell kit number 393691) and have

stainless steel pressure regulator springs for natural gas and red pressure regulator springs

for propane (LP).

Operation

1) When the Fan Switch is turned on:

a. The main fan motor should run.

b. The cooling fan on the side of the control box should run.

c. The temperature control should display the actual temperature.

2) When the Burner Switch is turned on;

a. The combustion air motor should spin.

b. The pilot gas valve should open and you should hear a “ticking”

noise. This is actually a high voltage spark arcing across tips.

c. The main gas valve should open and the burner should light.

d. The combustion should be audible and the actual temperature

should rise steadily.

e. To verify burner ignition, remove the front panel, and you should

see a blue flame under the lower fingers near the back of the unit.

There is also a flame inspection window in the burner.


3) When the Conveyor Switch is turned on;

a. The conveyor control should come on and display the desired

conveyor time.

b. The conveyor belt should move slowly.

Fan Subsystem

The Fan subsystem consists of a fan motor (M1) and capacitor (C1), a fan blade, a

control box cooling fan (M2), and a cool-down timer relay (R1). The oven fan motor is a

single phase 120VAC 1740 RPM motor. It requires a capacitor to run and has an

automatic internal thermal overload. It is usually electrically reversible to accommodate

either the CW or CCW fan blades. When replacing this motor be sure to verify proper

fan rotation. See oven decals and drawing A5000 in the Parts Manual for rotation and

fan installation details. The capacitor is remotely located in the control box. The fan

motor also has an auxiliary internal centrifugal switch which completes the circuit for the

burner blower motor. This is a burner safety feature that must NOT be defeated. The fan

motor is protected by fuse F1. The control box cooling fan keeps the electrical

components in the control box cool, and it must have its filter cleaned frequently.

Fan Subsystem Trouble-Shooting

Symptom Possible Case Solution

Fan not

running

No power Check Fuse F1.

Check voltage from switch S1.

Check voltage from relay R1.

Check voltage at motor leads.

Fan not

running

Bad capacitor Check capacitor C1 or replace with known good

capacitor.

Fan not

running

Bad automatic

internal overload

Make sure motor has cooled down, clean debris

from motor cover vent holes, check to see that

motor bearings rotate freely.

Noisy fan Loose fan blade set

screws

Remove back wall and tighten set screws on shaft

flats, make sure that fan position is 8.5" away

from the back wall. Use new set screws.

Noisy fan Bad bearings With power removed, spin shaft by hand and feel

for bearing roughness and noise.

Noisy fan Shaft rubbing Remove the back wall assembly. Remove the fan

blade from the motor shaft and inspect the motor

shaft to back wall sheet metal clearance. Adjust

as necessary.

Noisy fan (very

loud)

Fan blade rubbing Remove the front panel and 1 center upper and 1

center lower finger. Visually check the fan blade

to see if it is rubbing the fan shroud. Adjust the

fan motor bracket or back wall as necessary.


Burner Subsystem

The Burner subsystem consists of a forced air burner and gas train, a pilot valve

(V2), a main valve (V1), a burner control (BC), a temperature control (TC1), a

thermocouple (T/C), a modulating valve (V3) and signal conditioner (SC1), and a 24V

transformer (XR1). When the burner switch S2 is turned on, power is applied from S1 to

the common terminal of the output relay of the temperature control. The output 2 relay is

closed by the temperature controller (high alarm, auto reset programmed) and provides

power to the primary of the 24V transformer and also to the burner blower motor (M4).

The transformer provides the necessary voltage for both the signal conditioner and the

burner control. The burner blower motor (M4) must be spinning for the internal

centrifugal switch (S4) to complete the circuit to the burner control.

The thermocouple provides a temperature feedback to the temperature control.

The temperature control provides a 4-20 MA output to the signal conditioner. The signal

conditioner in turn proportionately provides a 2-20 VDC 400 MA power output to the

modulating valve. If the thermocouple either breaks or becomes out of range the

temperature controller will sense and force the output off.

The input of the temperature controller is protected by fuse F2, and the output is

protected by fuse F10. The transformer and burner blower motor are protected by fuse

F3. Fuse F9 protects the input of the signal conditioner while fuse F6 protects the output

to the modulating valve. Fuse F4 protects the pilot valve (V2) and fuse F5 protects the

main valve (V1). The combination gas valve has the pilot valve, the main valve, and the

pressure regulation contained within it. The knob on top of the combination valve must

be left in the ON position. See Figure 1. The lamp (L1) on the control box, if present,

indicates whether the flame sensor in the burner pilot is hot.

When the burner control receives power, the pilot valve opens and the spark

generator operates. If the pilot burner lights; the burner control senses flame current

through the spark wire, the spark generator then shuts off, and the main valve opens. The

burner control continues to monitor the pilot flame current. If the pilot burner does not

light after 90 seconds, the burner control locks out and must be reset by switching the

burner switch off and then back on. If the power is interrupted, the burner restarts when

power is restored. If there is a pilot flame failure (no current sensed in the spark wire) the

burner control starts trial for ignition again.

The modulating gas valve is plumbed in series with the main gas valve. See

Figure 3. In normal operation the main gas valve stays on all the time, while the

modulating valve is controlled by the temperature control. If there is a large difference

between the actual temperature measured by the thermocouple and the set point

temperature, the temperature controller has a high output value to the signal conditioner.

The signal conditioner in turn produces a corresponding high voltage output to the

modulating valve, which opens up to the maximum and causes the burner to operate at

maximum. As the temperature difference narrows the outputs similarly decrease, causing

the burner to fire at a reduced rate. There is enough heat loss even in an idle oven for the

modulating valve to always be open somewhat. Therefore the main valve is also always

open, and the burner control only needs to operate the ignition cycle once.

The modulating valve usually requires no adjustment. There are two bypass

needle valves on the opposite sides of the valve. The one that is inaccessible is always

closed by default. The accessible one is also usually closed but may be slightly open

depending on the model of oven. Another adjustment is the low fire bias screw which is


the brass plated screw located under the oval cap on top of the modulating valve. The

plastic screw under the cap is a plunger stop and is not adjustable. The function of the

low fire bias screw is to cause the required signal conditioner voltage range to change and

match the optimum range produced by the temperature controller output. In general this

screw is usually within a full turn of all the way out and does not require adjustment.

Also note that the modulating valve must be installed in an upright orientation.

The manifold pressure should be measured when the oven is operating. The best

time to do this is when the oven is cold. With the oven disconnected from power,

connect a 1/8" NPT brass hose barb fitting to the combination valve outlet pressure tap

port. Adjust the manometer scale to zero inches water column and connect the U-tube

manometer hose to the barb. Connect the oven to power and turn on the fan switch and

then the burner switch. After the oven ignites, the manifold pressure reading should be

3.5" for natural gas or 10.0" for propane gas. Adjust the pressure regulator screw as

required. The pressure regulator screw is located under a slotted cap screw on the inlet

side of the combination valve. Be sure to plug the outlet tap port after measurements and

adjustments are complete. It is always a good idea to leak check the gas train and pilot

line after servicing the gas train and burner components.

Figure 1: Combination Gas Valve


It is sometimes necessary to check the pilot gas pressure, especially for propane

ovens. In order to do this, remove the pilot line between the combination gas valve and

the burner. Loosen the fittings on each end of the pilot line (see Figure 2). Install a

pressure tap tee in the pilot line. This can be a permanent fitting with a removable cap on

the center port of the tee, or temporary rubber hose sections with a barbed tee. Attach a

manometer to the center port of the tee to monitor the pilot pressure. Remove the main

gas valve fuse from the control panel. This will cause the oven to fire only the pilot

circuit. Turn the oven on and adjust the pilot pressure by turning the pilot pressure

adjustment screw (see Figure 1) clockwise to reduce pressure. Conversely turning the

screw counterclockwise will increase the pressure. Adjust to 5-7" for natural gas or 8-10"

water column for propane. Also, if available, use a micro-amp meter to check the current

(2.0 micro-amps min.) in the flame sensor circuit. The flame inspection window can be

used to visually see the pilot light presence and color. At minimal pressure the flame will

be small or non-existent (out). Too much pressure, and the flame will be large and

yellow. Typically, the screw is turned in clockwise until the flame almost disappears and

then backed out slightly counterclockwise until the flame is blue and substantial.

When finished with the pilot pressure adjustment, remove the hoses, then cap or

remove the tee, and finally check for gas leaks with a soapy water solution. Use a mix of

2/3 liquid soap and 1/3 water. A small brush can be used to paint the joints with this

soapy mixture. An electronic leak detector can also be used instead. Be sure to replace

the main gas valve fuse and the pressure adjustment screw cover cap(s) on the gas valve.

Figure 2: Gas Train Assembly & Burner


XLT ovens employ an ignition control to initiate and monitor the operation of the

oven’s burner. Monitoring is accomplished by a flame sense feedback circuit. The flame

sense current loop is completed when the pilot flame 'paints' the spark electrode.

Electrons are then conducted by the flame from the spark wire to ground. When the

flame no longer touches the electrode or the electrode becomes encrusted with soot (LP

gas operation), the current loop is broken or weakened and then the ignition control shuts

off the valves.

This flame sense current can sometimes be strengthened or improved by adding a

ground wire between the burner and the combination valve. The primary path for the

ground is the pilot line back to the valve, but loose or rusty connections in the gas train,

burner casting, orifice holder, and/or flame sensor bracket fasteners can cause flame

sense problems. Of course, the pilot orifice size, pilot pressure, and air shutter setting

also affect proper pilot flame adjustment.

For direct spark burners (if equipped), the flame still needs to paint the sense wire,

but the flame base must also be attached to the end of the burner casting. It may be

necessary to adjust the air shutter (usually closed) to make the flame attach to the burner

casting end. The flame is also much more stable, especially in 'windy' conditions, when

it is attached to the casting end. For direct spark burners, the auxiliary wire is even more

helpful since the pilot is not present.

There is a corrugated Flame Retention Ring inside the burner casting at the end of

the burner. This is also known as a 'bluff body' and its purpose is to change the gas-air

velocity and allow the flame to attach to the end of the burner, thereby helping

completing the flame sense circuit.


Burner Control Trouble-Shooting


Pilot not lighting No power Turn the gas supply OFF.

Check Fuses F2 and F3.

Check voltage from switch S2.

Check voltage from output 2 terminal 1 on

temperature control.

Check 24V voltage at transformer output.

Check to see if combustion blower is running.

Check for voltage coming out of combustion

blower centrifugal switch.

Pilot not lighting No spark

generation

Pull ignition lead and check for spark. Use

jumper wire between the GND and SPARK

terminals. Spark must be at least 1/8" long.

Check ignition cable condition, ground wiring

must be clean and tight, spark wire boot not

melted, ceramic insulator not broken and

correct 1/8" spark gap.

Clean soot off of the pilot burner.

Pilot not lighting No gas Turn the gas supply ON.

Make sure all manual valves are fully open,

supply hoses and pipes are good, pilot orifice is

not plugged, and air is purged from the system.

Verify proper gas pressure.

Make sure electrical connections are good

between burner control and pilot valve.

Check for 24 VAC across PV-MV/PV terminals

on burner control. If voltage is OK, replace gas

control, if not replace burner control.

Main burner not

lighting

No power Check for 24 VAC across MV-MV/PV, if no

voltage, replace burner control.

Make sure electrical connections are good

between burner control and main valve; if OK,

replace combination valve.

Main burner not

staying lit

Faulty flame

sense

Check continuity of spark wire and ground

wire.

If pilot flame is steady and blue, replace pilot

burner assembly.

Main burner not

staying lit

“Windy”

condition

Check to see if the oven fingers are assembled

correctly. Check the fan blade position (see

parts manual for position measurement) and

verify fan rotation(s). Check to see if the pilot

module is snug against the venturi casting in the

burner, a gap will cause the pilot to blow out.


Combustion Blower Trouble-Shooting


Combustion blower

not running

Bad bearings With power removed, spin shaft by hand and

feel for bearing roughness and noise.

Combustion blower

not running

Centrifugal

switch

Check for power going in and out of fan

motor centrifugal switch.

Modulating Valve and Signal Conditioner Trouble-Shooting


Oven does not come

up to set point

temperature

No Power Check signal conditioner input and output

fuses.

Make sure that set point is below 550˚ F

Output light on temperature control should

be on if set point is above actual temperature.

Measure voltage across terminals 1 & 2 of

signal conditioner, should be 24 VAC.

Oven does not come

up to set point

temperature

Faulty signal

conditioner

Check for voltage going out to modulating

valve. Voltage across terminals 3 & 4 should

be close to 20 VDC. Check wire continuity

to top of modulating valve.

Temperature higher

than set point

Faulty

modulating valve

Remove leads from modulating valve, if

oven temperature does not drop, close the

bypass needle valve. Also may need to back

off low fire bias screw.

If oven temp does not drop, replace the

modulating valve. It is possible that foreign

debris is stuck between the valve plunger and

the seat.


Figure 3: Modulating Gas Valve

Temperature Control Trouble-Shooting


Error 400 Configuration

problem

Press the up and down arrows

simultaneously.

Reprogram the temperature control per

programming document.

If error persists, replace temperature control.

Error: under-range

or over-range

Broken

thermocouple

Check to see that thermocouple is in good

condition and is properly connected; observe

proper polarity.

Other Errors Internal

diagnostic error

Upon power-up the instrument performs a

self-check.

It is possible that reprogramming or

calibrating the control will clear the error; see

the instrument manual for the procedures.

Power-up again; if the error persists, replace

temperature control.


Figure 4: Temperature Control

Figure 5: Burner Control and Signal Conditioner


Barber Colman 7SC Programming Procedure

To switch display from F° to C°, see instructions at the end of this section.

1) Remove the instrument from its case and put the V101 switch in the open

position. The V101 switch is located on the bottom of the unit. Verify that

jumper J106 is:

1-2 3-4 5-6 7-8 9-10

Open Closed Open Open Open

The J106 jumper is located on the top of the unit. Insert the instrument back

into the case.

2) Turn on the power to the unit by switching the fan on. The display should

show COnF; press the FUNC key to step through the configuration parameters.

3) The following configuration parameters should be entered/verified (Use the

Up/Down keys to change the values if necessary):

Ser1 0FF P7 --

Ser2 1 P8 --

Ser3 19.20 P9 AL1.P

Ser4 7E P10 H.A.

P11 nonE

P1 22 P12 --

P2 -- P13 --

P3 0 P14 --

P4 600 P15 --

P5 rEU P16 0

P6 4-20 P17 SFt.A (3111)

4) The Display should now show: -.-.-.-. Press the Up/Down keys to display

262, and then press the FUNC key to access the advanced configuration.

5) The following advanced configuration parameters should be entered/verified

(Use the Up/Down keys to change the values if necessary):

P18 norL P32 1.0

P19 norL P33 0.20

P20 -- P34 0FF


P21 -- P35 --

P22 -- P36 tn.30

P23 -- P37 0

P24 rEU P38 --

P25 0FF P39 N0FL

P26 -- P40 --

P27 -- P41 P.I.d.

P28 0 P42 10.0

P29 0n P43 Fn.SP

P30 0 P44 0

P31 30.0 And FUNC one more time to C0nF

6) Remove the instrument from its case and put the V101 switch in the closed

position. Insert the instrument back into the case.

7) With the power on, the display may show ERROR 400; simultaneously press

the Up and Down arrow keys to clear this.

8) Press the FUNC key to cycle through the following operating parameters.

The only one that can be changed now is the SP (set point).

SP 500 td 0.00

Snrt 0FF 1P 30.0

SP2 0 rL 0

nnn 0n rH 600

AL1 550 Grd1 Inf

HSA1 0.1 Grd2 Inf

Pb 5.0 OLH 100.0

ti 5.00 toL Inf

rnP Inf

9) To change any of the above operating parameters, set nnn to 3111 (Safety

Lock parameter). Be sure to set nnn back to ‘5’ after changing any

parameters; this turns the Safety Lock back On. The next time through the

operating parameters, the nnn value will be On.

A detailed explanation of these configuration and operating parameters is given in

the Barber Colman instrument manual, which can be supplied on request or downloaded

via the internet at www.barber-colman.com.


Instruction to switch from Fahrenheit to Celsius readout

1) If you are replacing a control, you will need to verify the parameters listed in the

previous programming procedure before you continue.

2) Follow the programming procedure for steps 1 & 2.

3) At step 3, change the value of P1 to 5 and P4 to 300.

4) Scroll through the remaining values until COnF is displayed.

5) Remove the instrument from its case and return the V101 switch to the closed

position. Insert the instrument back into the case.

6) If the display shows ERROR 400; simultaneously press the Up and Down arrow

keys to clear this.

Your display should now be in Celsius. To convert Celsius to Fahrenheit, follow the

above directions but set P1 to 22 and P4 to 600.


Conveyor Subsystem

The Conveyor subsystem consists of a conveyor control (CC), a conveyor gear-

motor (M3), and a pulse generator (PU). When the conveyor switch S3 is turned on,

power is applied from S1 to the conveyor control. The conveyor can be operated with the

burner switch turned off. The conveyor gear-motor is a brush type 90 VDC variable

speed unit that has a pulse generator connected to the gear-motor high speed shaft. The

pulse generator is powered by a 5 VDC supply from the conveyor control and provides a

closed loop square wave output of 2 pulses per revolution (of the high speed motor shaft)

back to the conveyor controller. This scheme provides a constant conveyor speed

through the oven regardless of the loading on the conveyor.

Figure 6: Conveyor Control


Conveyor Control Trouble-Shooting


Conveyor motor

not running

No Power Check fuses in and out of the conveyor

control.

Check power in and out of switch S3.

If display is blank, check for 120 VAC

between terminals L and N on the control.

Check for DC voltage coming out of the

conveyor control.

Conveyor motor

not running (or

running

intermittently)

Worn brushes (or

defective brushes)

Remove brushes from conveyor gear-motor

and inspect. New brushes are approx 3/4"

long. Springs are also approx 3/4" long.

Conveyor motor

not running

Drive chain or

sprockets worn

Inspect drive chain for looseness.

Check sprocket setscrews on gear-motor

shaft and 3/4" conveyor shaft.

Check sprockets for worn teeth.

Display is dim Display intensity

parameter is too

low

Adjust parameter 11 to a higher value (range

is 0-31); see programming instructions.

Conveyor runs full

speed

Loose pickup

assembly

Check to see if the pickup assembly is

properly tightened to the gear-motor shaft.

Conveyor runs full

speed

Loose pickup

wires

Check to see if the wiring is properly

connected. The white wire is the signal, the

red wire is +5V, and the black wire is

common.

When power is

applied “LF-H” is

displayed

Excessive

electrical noise or

improper ground

Check to see if the oven is properly

connected to power and is properly

grounded. It is also possible that a nearby

appliance is on the same circuit and electrical

noise is present. Possible solutions are:

divide the circuit, employ line filters, re-route

the wiring, and use shielded power cable.


Dart MD10P Controller Programming Procedure

1) Move the J1 program enable jumper to ON so that the configuration parameter

settings can be changed. When the J1 jumper is OFF the programming

features are locked out to the front panel user. The Jumper J1 is located under

the dust cover on the back end of the upper board.

2) Put the control in program mode; hold the enter button until you see ( P 0 ).

3) Hold the up arrow until the display reads ( P 10 ). Push the enter button once;

push the up arrow key until you reach ( 2 ). This puts the controller in time

mode. Push the enter button again.

4) Hold the up arrow key until the display reads ( P 20 ). Push the enter button

once; push the up arrow key until you reach ( 2:40 ). This sets the minimum

display to 240 seconds (6 minutes). Push the enter button again.

5) Push the up arrow key once the display should read ( P 21 ). Push the enter

button once; push the down arrow key until you reach ( 6:00 ). This sets the

maximum display to 600 seconds (10 minutes). Push the enter button again.


button once; push the down arrow to the appropriate time. This is the signal

input display reference time (at parameter 31 RPM). Push the enter button

again. Note that the distances below are the length through the bake chamber.

32" oven: 64 sec

40" oven 79 sec

55" oven 109 sec

70" oven 138 sec


button once; push the up arrow to the appropriate value. For Dayton gear-

motors use 2980 and for Baldor use 3094. This is the RPM of the encoder (at

parameter 30 time) for particular gear-motor/pickup combinations. Push the

enter button again.


button once; make sure the display shows ( 1 ). This is the pickup pulse per

revolution value. Push the enter button again.

9) Hold the down arrow key until the display reads ( P 0 ). Push the enter button;

this will put you in run mode.

10) The display should read ( 4:00 ); pan check the belt to make sure that you are

programmed correctly. The belt time is measured by starting when the

leading edge of a pan just starts to enter the bake chamber and stopping when

the leading edge of the pan just begins to exit the bake chamber.

11) Once you are programmed correctly, move the program enable jumper J1 to

OFF so that these settings cannot be changed.

To reset all values to factory defaults, make sure that the Programming jumper is

set to ON (see step 1 above), and change the value of parameter 95 to 5, or press and

hold both enter and down buttons for 3 seconds while applying power to the unit.


Conveyor Belt

To properly change your conveyor movement from left to right or vice versa, two

changes must be made. 1) Change the electrical input to the conveyor drive motor, and 2)

Reverse the direction of the fabric of the conveyor belt itself.

First things first; safety. Shut off gas to oven; disconnect power and gas lines from

oven. For your own safety, do not attempt this with gas line or electrical line connected.

Required tools:

• #2 Phillips Screwdriver

• Needle-nose Pliers

Approximate time required: 45 min – 1 hr

Remove conveyor flaps on both ends

by removing the thumb screws. Note

which row of holes the screws were in

for proper reassembly later.


Remove the six (6) screws located

around the control box cover.

Remove chain guard from side panel

of control box by removing two (2)

thumb screws, tilting the chain guard

to clear the lip of the control box

cover, and pull straight upward.


Grasp the conveyor firmly and lift up until the crumb tray bracket clears the conveyor

opening. Slide the conveyor 1” – 2” into the oven to release the tension on the chain.

Remove the drive chain from the conveyor sprocket and lay it in the tray.

Remove the cover carefully.


Now that the electrical portion of the process is complete, the conveyor belt fabric needs

to be reversed. A reasonable amount of care needs to be taken during this process to

ensure all goes smoothly.

The conveyor drive motor is

located in the control box.

The drive motor is plugged into one of

a pair of control wires. Disconnect (by

pulling plastic connectors apart) the

first set of control wires and reconnect

to the second set of control wires to

reverse the direction of the motor. Split

belt units will have two motors and

follow the same process for both.


Release belt tension by removing two (2) screws each at the idler/tension shaft blocks.

Once found, disassemble the splice as shown in the following pictures. Care must be

taken not to over-bend the wires while unhooking the links.

Find the belt splice by manually

advancing the fabric.


Using a pair of needle-nose pliers, grip

the free end of the first splice link.

Pinch the adjacent rows together to

relieve tension on the fabric at the

splice. Twist the end (as shown) to

clear the link.

The first end of the link has been

released.

To release the edge link, rotate the

link up as shown …


Continue to rotate until clear of the

lower end hook.

Pass the hook back around the wire

until disengaged.

Remove and set aside for reinstallation.

Proceed to the next splice link. Grip

the end as shown …


Roll the fabric carefully as shown. Do not crimp, fold, or roll tightly.

Twist the end (as shown) to clear the

link.

Repeat for all links in the splice row.

Care should be taken to keep from

distorting the splice links during

removal. Set aside all links for reuse.


Once rolled, turn the fabric end-for-end

in preparation of reinstallation.

Correct side up.

Incorrect side up.

Fabric orientation is critical for the

service life of the belt. Check to see

that the correct side is up by curling

the end as shown.


The belt is fed over the drive sprocket following the sprocket until feeding over the

conveyor lower guide.

CAUTION

Belt travel should be toward the

head of the link.

Belt travel with the hook of the

link constitutes a safety hazard

from snagging loose material and

dragging it into the conveyor or

oven.


Continue feeding the belt through the conveyor as shown.

As you reach the idler sprockets, feed the belt from underneath, over the sprockets across

the upper conveyor surface and back through the remaining conveyor belt circuit.


The belt is ready to be re-connected at the splice joint. The process for this connection is

simply the reverse of the process described earlier during disassembly. Once the belt has

been spliced, check the alignment of the power and idler sprockets for proper engagement

as shown.

Tension the belt and replace the four (4) screws removed earlier from the idler/tension

shaft blocks.

Check the conveyor belt for free

movement.


Set the conveyor back in place.

Replace the control box cover.

Reinstall the drive chain.


Replace the flaps on both sides.

The conveyor belt direction reversal is complete. Reconnect the oven and test for proper

function.

Reinstall the chain guard.


Electrical Schematics



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