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The information provided in this training module covers the schematic flow charts for all ovens and ranges that

utilized a preheat board, Self Clean timer and mechanical relays. There were different variations of

this design. The following information covers the majority of those models.

NOTE: The information provided is subject to change without notice.

Viking Range Corporation – May 2008

Start

Please note that if you move the cursor over any of the components listed below during this presentation you

will open a viewing window on that component.

When open, you will see a photo of the component along with a drawing of each part, wire colors, numbers

and the termination points of each wire

Parts available for viewing:

R1 relay R2 relay R3 relay� �

Selector Switch Self Clean Timer Preheat Board� �

Select a program below

CONV BAKECONV BAKE

CONV COOKCONV COOK

BAKEBAKE

MAX BROILMAX BROIL

CONV BROILCONV BROIL

BROILBROIL

SELF CLEANSELF CLEAN

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The selector is set to the BAKE cycle.

The thermostat is turned “ON” to the desired temperature.

L1 Power flows first through the High Limiter, then through the operating thermostat, through the R3 and R2 relays to the R1 relay coil. Both the L1 and L2 power flow to the elements through the R1 relay.

The R1 relay closes and the cycle light is illuminated.

L1 Power flows to the Bake Element and the Inner Broil Element.

L1 Power flows to the preheat board Sensor 2. AT4 is post high limit and pre-operating thermostat while AT3 is post operating thermostat.

L2 Power flows from the R1 relay to terminal L2 on the selector. Through the switch to terminal #1 on the selector and then into the BAKE element. The BAKE element heats @ 11.5 amps.

L2 Power also flows to Sensor 1 – AT6 on the preheat board. It is wired parallel to the BAKE element while AT2 is wired parallel to the L2 connection on the selector switch. Both are cycled through the R1 relay.

This slide shows the NEUTRAL connections to the preheat board. Notice that the NEUTRAL line is connected to AT15 which is the N.C. contact on Relay K4 on the preheat board. This will be explained later.

This slide shows both the K3 and K4 relays closed on the preheat board.

This slide shows the L2 power flow through AT 14, the N.O. terminal on the K3 relay – through AT 13 (the common terminal) and supply L2 power to both the Outer Broil element and the Inner Broil element. The Inner Broil element heats @ 5.20 amps.

This slide shows the L1 power flow from terminal #4 on the selector switch to AT17, the N.O. terminal on K4 on the preheat board. From AT 16 (Common terminal) to the Outer Broil element. The Outer Broil element heats @ 7.30 amps. Total amps on PREHEAT: 24 AMPS.

When the oven has reached its set temperature, the power is pulled away from the R1 relay. L1 and L2 power is removed from all three heating elements. The preheat board has sensed that the oven has cycled off so it disengages the K3 and K4 relays. We now have a NEUTRAL connection to the Outer Broil element.

When the oven has cooled, the oven thermostat will close. The R1 relay closes L1 power flows to the Bake and Outer Broil elements. L2 flows through the selector to the Bake element which draws 11.5 amps.

The preheat Board does not activate the K3 and K4 relays. We now have Neutral flowing through the K4 relay to AT 16 then to the Outer Broil element. Because selector switch contact 3 and E are closed, the Inner and Outer broil elements are in series. At 120 volts – they will draw 1.5 amps. Total amps on COOK: 13 AMPS

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The selector is set to the CONV BAKE cycle.

The thermostat is turned “ON” to the desired temperature.

L1 Power flows first through the High Limiter, then through the operating thermostat, through the R3 and R2 relays to the R1 relay coil. Both the L1 and L2 power flow to the elements through the R1 relay.

The R1 relay closes and the cycle light is illuminated.

L1 Power flows to the Bake Element and the Inner Broil Element. L1 also flows through Selector contact # 6 and contact # I to the convection fan motor.

L1 Power flows to the preheat board Sensor 2. AT4 is post high limit and pre-operating thermostat while AT3 is post operating thermostat.

L2 Power flows from the R1 relay to terminal L2 on the selector. Through the switch to terminal #1 on selector. Power flows into the BAKE element. The BAKE element heats @ 11.5 amps.

L2 Power also flows to Sensor 1 – AT6 on the preheat board. It is wired parallel to the BAKE element while AT2 is wired parallel to the L2 connection on the selector switch. Both are cycled through the R1 relay.

This slide shows the NEUTRAL connections to the preheat board. Notice that the NEUTRAL line is connected to AT15 which is the N.C. contact on Relay K4 on the preheat board. This will be explained later.

This slide shows both the K3 and K4 relays closed on the preheat board.

This slide shows the L2 power flow through AT 14, the N.O. terminal on the K3 relay – through AT 13 (the common terminal) and supply L2 power to both the Outer Broil element and the Inner Broil element. The Inner Broil element heats @ 5.20 amps.

This slide shows the L1 power flow from terminal #4 on the selector switch to AT17, the N.O. terminal on K4 on the preheat board. From AT 16 (Common terminal) to the Outer Broil element. The Outer Broil element heats @ 7.30 amps. Total amps on PREHEAT: 24 AMPS.

When the oven has reached its set temperature, the power is pulled away from the R1 relay. L1 and L2 power is removed from all three heating elements. The preheat board has sensed that the oven has cycled off so it disengages the K3 and K4 relays. We now have a NEUTRAL connection to the Outer Broil element. The Convection fan continues to run.

When the oven has cooled, the oven thermostat will close. The R1 relay closes L1 power flows to the Bake and Outer Broil elements. L2 flows through the selector to the Bake element which draws 11.5 amps.

The preheat Board does not activate the K3 and K4 relays. We now have Neutral flowing through the K4 relay to AT 16 then to the Outer Broil element. Because selector switch contact 3 and E are closed, the Inner and Outer broil elements are in series. At 120 volts – they will draw 1.5 amps. Total amps on COOK: 13 AMPS

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The selector is set to the CONV COOK cycle.

The thermostat is turned “ON” to the desired temperature.

L1 Power flows first through the High Limiter, then through the operating thermostat, through the R3 and R2 relays to the R1 relay coil. Both the L1 and L2 power flow to the elements through the R1 relay.

The R1 relay closes and the cycle light is illuminated.

L1 Power flows to the Convection Element. L1 also flows through Selector contact # 6 and contact # I to the convection fan motor.

L2 Power flows from the R1 relay to terminal L2 on the selector. Through the switch to terminal #5 on selector. Power flows into the CONVECTION element. The Convection element heats @ 9.2 amps.

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The selector is set to the BROIL cycle.

The thermostat is turned “ON” to the Broil setting.

L1 Power flows first through the High Limiter, then through the operating thermostat, through the R3 and R2 relays to the R1 relay coil. Both the L1 and L2 power flow to the elements through the R1 relay.

The R1 relay closes and the cycle light is illuminated.

L1 Power flows to the Inner Broil Element..

L2 Power flows from the R1 relay to terminal L2 on the selector. Through the switch to terminal #3 on selector. Power flows into the INNER BROIL element. The Inner Broil element heats @ 5.2 amps.

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The selector is set to the MAX BROIL cycle.

The thermostat is turned “ON” to the Broil setting.

L1 Power flows first through the High Limiter, then through the operating thermostat, through the R3 and R2 relays to the R1 relay coil. Both the L1 and L2 power flow to the elements through the R1 relay.

The R1 relay closes and the cycle light is illuminated.

L1 Power flows to the Inner Broil Element. We also have F1 power flowing through terminal # 4 to terminal F in the selector. It then flows through AT 12 - the N.C. contact in the K3 relay on the preheat board (inactive in Max Broil). Through AT 13 to the Outer Broil element.

L2 Power flows from the R1 relay to terminal L2 on the selector. Through the switch to terminal #3 on selector. Power flows into the INNER BROIL element. The Inner Broil element heats @ 5.2 amps.

At the same time, L2 power also flows through the L2 terminal on the selector to terminal # 2. Power then flows through AT 15 - the N.C. contact in the K4 relay on the preheat board (inactive in Max Broil). Through AT 16 to the outer broil element. The Outer Broil element heats @ 7.3 amps. Total on Max Broil: 12.5 AMPS

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The selector is set to the CONV BROIL cycle.

The thermostat is turned “ON” to the Broil setting.

L1 Power flows first through the High Limiter, then through the operating thermostat, through the R3 and R2 relays to the R1 relay coil. Both the L1 and L2 power flow to the elements through the R1 relay.

The R1 relay closes and the cycle light is illuminated. L1 also flows through Selector contact # 6 and contact # I to the convection fan motor. The fan motor continues to run throughout the Convection Broil program.

L1 Power flows to the Inner Broil Element. We also have F1 power flowing through terminal # 4 to terminal F in the selector. It then flows through AT 12 - the N.C. contact in the K3 relay on the preheat board (inactive in Max Broil). Through AT 13 to the Outer Broil element.

L2 Power flows from the R1 relay to terminal L2 on the selector. Through the switch to terminal #3 on selector. Power flows into the INNER BROIL element. The Inner Broil element heats @ 5.2 amps.

At the same time, L2 power also flows through the L2 terminal on the selector to terminal # 2. Power then flows through AT 15 - the N.C. contact in the K4 relay on the preheat board (inactive in Max Broil). Through AT 16 to the outer broil element. The Outer Broil element heats @ 7.3 amps. Total on Conv Broil: 12.5 AMPS

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The selector is set to the SELF CLEAN cycle.

The thermostat is turned “ON” to the CLEAN setting. MS1 and MS2 close in the operating thermostat.

L2 power flows through the thermostat to the R3 relay coil.

The R3 relay coil energizes. As long as the thermostat is in the CLEAN cycle, the R3 relay will remain closed.

With the R3 relay energized, L1 power flows though the thermostat – then through the R3 relay coil – then to the SW3 contact on the door latch assembly. This will be the power supply to the R1 relay. This circuit will be explained in detail later.

With the selector switch in the CLEAN position, L1 power flows through terminal # 6 and terminal J in the selector switch, then to the R2 relay coil.

The R2 coil engages. We now have the R2 coil (L1-N) and the R3 coil (L2-N) closed.

L1 power also branches off the R2 coil – travels through the closed contact in the R3 relay, then flows to the both the Clean Light and SEL contact in the Self Clean timer. The Self Clean timer is now activated. NOTE: The clean light illuminated indicates that L1 power is present at the Self Clean timer.

The LS1 and LS2 contacts in the self clean timer now close.

With the LS1 and LS2 contacts closed, L1 power flows through LS1 – then through the auto reset N.C. contact #1 and #3. It then flows through the LS2 –then to the lock motor. The lock motor begins to lock the door.

When the door motor has locked the door, SW2 and SW3 in the door lock are now closed. SW2 sends a return signal from VG on the Self Clean timer to SENSOR 3, signaling that the door has locked.

With the door now locked, the Self Clean timer has opened the LS2 contact, stopping the power to the lock motor.

The Self Clean timer now closes contacts T1 and T2 and T3 and T4. These circuits will control the cooling fan (T3-T4) and the R1 relay (T1-T2).

L2 power flows through the T3-T4 contact in the self clean timer. The power by-passes the fan thermostat - then flows into the cooling fan.

With the door locked, the self clean cycle is ready to begin. Starting at the operating thermostat – L1 flows through the N.O. contact in the R3 coil – then to the SW3 contact in the door lock assembly. From there, it flows through T1-T2 in the Self clean timer then travels back to the N.O. contact in the R2 relay and finally ends up at the coil of the R1 relay.

The R1 coil now closes and the cycle light is activated. With the CLEAN light on, it is a good indication that the Selector, Thermostat,R2 and R3 relays are all functioning properly. The CYCLE light lets you know that the R2 and R3 relays are closed and that the T1-T2 (Self Clean timer) and the SW3 in the door lock assembly are also functioning properly.

With the R1 relay energized, L1 power flows to the Bake Element and Inner Broil element. With terminal # 4 and F closed in the selector – L1 power also flows through the K3 relay on the preheat board (Deactivated in Self Clean) and then to the Outer Broil element.

L2 power flows through the R1 relay to terminal L2 and # 3 in the selector switch to the Inner Broil element. The Inner Broil element draws 7.3 AMPS

At the same time, L2 power flows through terminal L2 and # 2 in the selector switch – Through the K4 relay in the preheat board, then to the Outer Broil. The Outer Broil draws 5.2 amps. Total of 12.5 AMPS on the broil elements.

As shown on the last slide, the oven heats during Self Clean by using both the Inner and Outer broil elements. The bake element is also utilized during the self clean process. It is operated on 120 volts. This is achieved by the selector switch channeling the NEUTRAL to the element through terminal N and # 1 on the selector. The Bake element will draw 5.75 AMPS. Total amps on Self Clean: 18.25 AMPS

During the Self Clean Cycle, when the oven temperature reaches 575º F, the Auto Reset will trip and open contacts #1 and #2. This will prevent the door motor from opening if the oven temp is too hot.

When the cabinet temperature has reached 230ºF, the Cooling Fan thermostat will close to the cooling fan motor. The fan will continue to run until the cabinet cools below 230ºF.

When the internal temperature has reached 825ºF, the control thermostat will open. We now has removed our L1 circuit through R3 – SW3 (Door Lock) – T2-T3 (Self Clean timer) –Back through the N.O. contact in the R2 relay. The cooling fan continues to run. This process will repeat for 3.5 hours when the Self Clean cycle has completed.

At the end of the Self Clean cycle, the Self Clean Timer will once again close LS1 and LS2. The Door will remained locked until the Auto Reset closes.

When the Auto Reset resets between contacts #1 and #2, L1 Power flows through LS1 - then the Auto Reset – Then through LS2 to the lock Motor. The lock motor turns to unlock the door.

When the door motor has unlocked the door, SW2 and SW3 in the door lock are now open. SW1 sends a return signal from VG on the Self Clean timer to SENSOR 4 signaling that the door has un-locked.

With the door open signal sent to the Self Clean timer, contacts LS1 and LS2 are opened. The cooling fan will cycle off when the fan thermostat opens. Advancing the operating Thermostat to OFF will disengage the R3 relay while advancing the selector to OFF will disengage the R2.

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Old Style

Return

R1 RELAY

8 Position selector

Return

Old Style

A B

1

4

7

3

6

9

N.C.

N.O.

C

R2 – RELAY

Return

Old Style

A B

1

4

7

3

6

9

N.C.

N.O.

C

R3 – RELAY

Return

Old Style

A B

1

4

7

36

9

N.C.

N.O.

C

R2 – R3 RELAY

R2 – RELAY

R3 – RELAY Return

Old Style M1 LS1M1 LS1

SENSE 3 SENSE 3

N N

SENSE 4 SENSE 4

VC VC

LS2 LS2

SEL SEL

L1 L1

Self Clean timer

Return

Old Style

K3K3

K4K4

AT 8AT 8AT 2AT 2

AT 14AT 14

AT 12AT 12

AT 13AT 13

AT 16AT 16

AT 17AT 17

AT 15AT 15 AT 11AT 11

AT 10AT 10

AT 1AT 1AT 7AT 7

AT 5AT 5

AT 9AT 9AT 4AT 4 AT 3AT 3

AT 6AT 6

Preheat board Return