How it Works
Viking
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VDSC305
Service Manual
29 pgs977.07 Kb0
Service Notebook
50 pgs720.43 Kb0

Viking VDSC305, VDSC365, VDSC485, VESC305 Service Manual

Preferred Service
Service Manual
30 • 36 • 48 Inch Dual Fuel range All electric range
This Base Manual covers general and specific information including, but not limited to the following models
VDSC305 VDSC365 VDSC485
VESC305 VESC305
TABLE OF CONTENTS
VDSC305 – VDSC365 – VDSC 485 VESC305 – VESC306
COMPONENTS AND FUNCTIONAL PARTS:
Control / Timer -------------------------------------------------------------------------------------------- 4 Auto Reset Switch (Thermostat ) -------------------------------------------------------------------- 4 High Limit Switch----------------------------------------------------------------------------------------- 5 Cooling Fan Limit Switch ------------------------------------------------------------------------------ 5 Selector Switch ------------------------------------------------------------------------------------------- 5 Oven Thermostat ------------------------------------------ -------------------------- -------------------- 5 Door Lock Assembly ------------------------------------------------------------------------------------ 6 Relay #1 --------------------------------------------------------------------------------------------------- 6 Relay #2 and #3 ----------------------------------------------------------------------------------------- 6 Convection Fan ------------------------------------------------------------------ ------------------------ 7 Cooling Fan ----------------------------------------------------------------------------------------------- 7 Oven Light Assembly ----------------------------------------------------------------------------------- 7 Voltage and Resistance checks (Self Clean Timer)-------------------------------------------- 8 Voltage and Resistance checks (Heating elements)-------------------------------------------- 9 Selector Switch Contacts ------------------------------------------------------------------------------ 10
WIRING DIAGRAMS
Bake --------------------------------------------------------------------------------------------------------- 11 Convection Bake ----------------------------------------------------------------------------------------- 12 Convection Cook ----------------------------------------------------------------------------------------- 13 Mini Broil ---------------------------------------------------------------------------------------------------- 14 Maxi Broil ---------------------------------------------------------------------- ----------------------------- 15 Convection Broil ------------------------------------------------------------------------------------------ 16
SELF CLEAN
Self Clean (initiate door lock ) ------------------------------------------------------------------------ 17 Clean (door lock below 575* ) ---------------------------------- --------------------------------------- 18 Clean (door lock above 575* ) ------------------------------------------------------------------------- 19 Clean Finished (door lock above 575* ) ------------------------------------------------------------ 20 Clean Finished (door lock below 575* ) ------------------------------------------------------------ 21 Clean Finished (door unlocked ) -------------------------------------------------------------- ------ 21A
ELECTRICAL CONNECTIONS
3 wire or 4-wire wall plug ------------------------------------------------------------------------------------ 22 Hard wire connection ----------------------------------------------------------------------------------------- 23
SERVICE Disassembly – Component location-------------------------------------------------------------- 24 - 26 Procedures to unlock door with door motor failure -------------------------------------------- 27 VESC Top removal ------------------------------------------------------------------------------------- 28 VESC Voltage / Resistance / Current checks ---------------------------------------------------- 29
VDSC COMPONENTS
(
WITH COLOR CODED WIRES)
DOOR LOCK CONTROL / TIMER
Function: The Door Lock Control / Timer is activated by the line voltage at the “ SEL” ( 1 ) contact. Relay “ RL1" ( 2 ) and “RL2" ( 3 ) close providing voltage to the Door Lock Motor. The Relays stay closed until 10 seconds after sensor #3 ( 4 ) receives a signal that the Door Lock is fully closed. Once this happens Relay “RL2" ( 3 ) opens to stop the Door Lock Motor. Relay “RL1" ( 1 ) stays closed providing voltage to the Auto Reset thermostat. Relays “RL3" and “RL4" close powering the Cooling Fan Motor and Cycle Relay. “RL3" and “RL4" will stay closed for 3 ½ hours unless power is interrupted to sensor #3 ( 4 ) or SEL ( 1 ). In which case “RL3" and “RL4" will open, interrupting the clean cycle and Cooling Fan, and “RL2" ( 3 ) will close, opening the Door Lock. “RL2" ( 3) will stay closed until 2 seconds after sensor # 4 ( 5 ) is powered.
AUTO RESET SWITCH
Function: The Auto Reset Switch is a single pole / double throw switch ( thermostat ) which is activated by a thermobulb and lever which is calibrated to 575* F plus / minus 25* F. Clean door lock below 575* F. The Door Lock Motor is energized through the Auto Reset Switch ( thermostat ) contacts 2 - 1. Clean door lock above 575* F. Auto Reset Switch ( thermostat ) switches to contacts 1 -3 turning on the Door Lock indicator Light and disables the Door Lock Motor circuit. Final below 575* F. Auto Reset Switch ( thermostat ) switches to contacts 1 -2, turning off the Door Lock Motor circuit through door Lock Motor / Timer Relay LS2 ­M1. Door Lock Motor operates until 2 seconds after sensor 4 is signaled by VC that the Door Lock switch SW1 has been closed mechanically by the door lock bolt. The Door Lock / Timer switches LS2 - M1 and LS1-L1 open and the timer resets.
4
VDSC COMPONENTS ( Con’t )
HIGH LIMIT SWITCH
Function: The Switch has a ½ “ bi-metal disc. The two metals have different thermal coefficients of expansion which cause the disc to bow as it heats up. When it reaches the calibration temperature the disc snaps open, which opens the electrical contacts. The Switch opens when temperature reaches 275* F plus or minus 9*F and will close when temperatures are 248* F plus or minus 9*F.
COOLING FAN LIMIT SWITCH
Function: The Switch has a ½ “ bi-metal disc. The two metals have different thermal coefficients of expansion which cause the disc to bow as it heats up. When it reaches the calibration temperature the disc snaps closed, which closes the electrical contacts. The Switch closes when temperatures reach 230* F plus or minus 9* F and will open when temperatures are below 203* F plus or minus 9*F.
SELECTOR SWITCH
Function: Rotating the shaft twists a cam which moves one or more spring loaded levers, which make contact with a terminal closing the circuit.
OVEN THERMOSTAT
Function: As the shaft is rotated from the OFF position clockwise, an internal cam pushes a lever, which increases the temperature at which the thermostat cycles. Rotating the shaft 212* (angle *) switches an external (clean) Micro Switch to the closed position.
5
VDSC COMPONENTS ( Con’t)
DOOR LOCK
Function: When the Door Lock Motor is powered it turned a cam which pulls back a lever. As the lever moves back it allows a micro switch (SW1) to open. When the lever reaches the fully closed position it closes a double stacked micro switch (SW2 & SW3). Door lock switch SW2 completes the circuit to sensor #3 on the Door Lock Control/timer board. After 10 seconds LS1-M1 opens, stopping the Door Lock motion. Door Lock Switch #3 closes T1-T2 and T3-T4 energizing Power Relay #1 and the Cooling Fan. Closing Power Relay contacts supplies 240 VAC to both Broil Elements and 120 VAC to the Bake Element.
POWER RELAY #1
Function: Relay #1 ( power ) supplies power to the Bake and Broil Elements.
RELAY #2 and RELAY #3
Function: Setting the selector switch to clean closes the Heating Element circuits 4-F, 1-N, 2-L2, 3-L2 and Door Lock Module / Timer circuit J-6, energizing Relay #2.The thermostat cycling contacts 1 to 2 and the clean switch contacts 3 to 4 close energizing Relay #3. Relay #3 allows circuit J-6 to turn on the Clean Indicator Light and enable the Door Lock Module / Timer to close Relays LS1-L1 and LS2 - M1. This powers the Door Lock Motor until 10 seconds after Sensor 3 is signaled by VC that Door Lock Switch SW2 has been closed mechanically (along with SW3) by the Door Lock Bolt.
6
VDSC COMPONENTS ( Con’t )
CONVECTION FAN MOTOR
Function: Provides an even flow of air in the oven cavity for more even baking.
COOLING FAN MOTOR
Function: Provides a continuous supply of cool air during self clean cycles to keep the Door Lock Motor and associated circuits cool.
OVEN LIGHT
Function: Provides interior oven light for viewing baking products.
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VOLTAGE READINGS
MEASURED WITH DOOR OPEN
T4 107VAC 70VAC
T3 4VAC 16VAC
T2 4VAC 16VAC
T1 5VAC 1VAC
MEASURED WITH DOOR LOCKED
T4 80VAC 56VAC
T3 85VAC 56VAC
T2 90VAC 56VAC
T1 93VAC 56VAC
VC--4VDC
SENSOR 3--3VDC SW2 closed in self clean
(Locked).
SENSOR 4--4VDC SW1 closed with clean lock open.
M1--120VAC lock motor supply voltage.
(31VAC in locked position)
LS2--70VAC (unlocked)--55VAC (locked)
L1-- 70VAC (unlocked)--56VAC (locked)
L2/M2--16VAC (unlocked)--32VAC
(locked)
LS1--107VAC (locked or unlocked)
SEL--120VAC SUPPLY
8
VOLTAGE and RESISTANCE READINGS
BAKE ELEMENT:
“A” to “B” 21.1 Ohms
“A” to “B” 240VAC during Bake and Convection Bake.
BROIL ELEMENT:
“A” to “D” ( outside element ) 32.6 Ohms
“A” to “D” 50VAC during Bake and Convection Bake.
240VAC during Maxi Broil. 240VAC during Convection Broil 240VAC during Self-clean
“B” to “C” ( inside element ) 45.2 Ohms
“B” to “C” 70VAC during Bake and Convection
Bake. 240VAC during Mini Broil 240VAC during Maxi Broil 240VAC during Convection Broil 240VAC during Self-clean
CONVECTION ELEMENT:
“A” to “B” 26 Ohms
“A” to “B” 240VAC during Convection Cook
9
8 POSITION SELECTOR SWITCH (With shaft position and internal connections
SELF CLEAN
Selector Switch closes Heating Element contacts 4-F, 1-N, 2-L2, 3-L2, and Door Lock Module
/Timer contacts J-6 energizing Relay #1. Thermostat Clean Position closes Thermostat cycling contacts 1-2 and normally open (N) ­common (C) energizing Relay #3. Relay # 3 turns on the Clean indicator Light and energizes Door Lock Module / Timer (PC Board) relays LS1-L1 and LS2-M1, also supplying 120VAC to SEL on the PC board Relays LS1 and LS2 turns the Door Lock Motor on through the Auto Reset Thermostat contacts 2-1. Door Lock Motor rotates opening SW1 and closing SW2 and SW3. Door Lock Switch #2 completes the circuit to sensor #3 on the PC board. After 10 seconds LS1-M1 opens, stopping the Door Lock motion. Door Lock Switch #3 closes T1-T2 and T3-T4 energizing Power Relay #1 and the Cooling Fan .Closing Power Relay #1's contacts supplies 240VAC to both Broil Elements and 120VAC to the Bake Element.
CLEAN DOOR LOCK ABOVE 575*F +/-25*F
Auto Reset Thermostat switches to contacts 1-3
turning on the Door Lock indicator Light and disables the Door Lock Motor circuit.
CLEAN TEMPERATURE (875*F) REACHED.
Door Lock Module / Timer opens T3 -T-4 and
T1-T2 turning off the Cooling Fan, now powered by the Fan Limit Switch when needed, and opens the circuit to the Power Relay #1 disabling the Heating Elements.
FINAL BELOW 575*F +/-25*F
Auto Reset Thermostat switches to contacts 1-
2, turning off the Door Lock Motor circuit through Door Lock Motor / Timer Relay LS2-M-
1. Door Lock Motor operates until 2 seconds after sensor 4 is signaled by VC that the Door Lock /Timer switches LS2- M1 and LS1-L1 open and the Timer resets.
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