HV-100E Service Training

Description: TB1/Field Wiring Terminal Block

Purpose: Site supply power terminal block

Location: At the rear of the unit on the right side, visible by removing the right side panel.

NOTES: The unit’s required supply is 3 Wire and Ground and should match the unit’s rating plate for voltage. If a high leg is present, do not place it on the same leg as the 14 AWG wires to the control circuit.

Description: Fuse HolderTB1/Field Wiring Terminal Block

Purpose: Provides fuse protection to the 440/480V control supply circuit

Location: To the left of the element contactor in the slide out control compartment

NOTES: The fuse holder holds two 7 amp fuses, part number 51455.

Description: Step Down Transformer

Purpose: Transforms 440/480 volts to 208 volts to power the control circuits.

Location: In the rear of the unit on the right side, visible by removing the right side panel.

NOTES: All readings are with wires detached. The transformer should read 2 ohms between terminals 440 and 0 IN, and 1 ohm between 220 and O OUT.

Description: CB1/20 amp manual reset circuit breaker

Purpose: Provides over current protection to the 208V control supply circuit

Location: On the bottom left front control panel to the left of the USB port

NOTES: Trip amps of 27 and a delay of 24

Description: TB2/208V AC voltage and ground terminal block

Purpose: Distributes 208V AC and ground within the control circuit

Location: To the right of the heat sink probe in the slide out control compartment

NOTES: TB2 feeds 208V AC to the 24V AC transformer, the 24V DC power supply and the inverter drive.

Description: T1/120 to 24V AC transformer

Purpose: 24V AC power supply to the relay board and a the controller

Location: To the right of the circuit breaker in the slide out control compartment

NOTES: All readings are with wires detached. The transformer should read 25 ohms between terminals 2 and 5, and 0.6 ohms between 6 and 10.

Description: 24VDC Power Supply

Purpose: Converts AC to DC power

Location: To the left of the inverter in the slide out control compartment

NOTES: All readings are with wires detached +V to -V should read 326 Ohms. L to N should read 0.6 ohms.

24VDC Short Troubleshooting Procedure

Description: TB3/rear terminal block

Purpose: Distribute 24V DC power to the high limit and the lights. (it is also the return for the vent – 24V DC)

Location: With the back panel of the oven removed, the terminal block is inside on the left.

NOTES: This terminal block is also grounding the 24V DC return to the unit chassis on the center terminals.

Description: 12V DC halogen cavity lights

Purpose: Illuminate the oven cavity

Location: Inside the oven cavity on the top surface

NOTES: There are two styles of lights; round and rectangular

Description: SW4/cavity high limit

Purpose: Manual reset capillary high limit monitors the oven cavity temperature and trips the shunt trip circuit breaker if cavity overheats

Location: The reset is visible with the slide out control panel completely pulled just inside the control cavity. The capillary bulb feeds through the back panel of the oven cavity to the right of the convection motor when looking at the back of the motor.

NOTES: The cavity high limit trips at 671 degrees F. It trips the CB2/circuit breaker and sends a 24V DC signal back to the control through the relay board on J11.3 to trigger a high limit error.

Description: SB2/25 amp 3 pole circuit breaker with trip coil

Purpose: Over amperage and thermal tripping to the supply to the element contactor

Location: To the right of the element contactor in the slide out control compartment

NOTES: Using the trip coil, the cavity high limit can trip the circuit breaker if the cavity temperature reaches over 671 degrees F. The tri coil should read 3.7 amps.

Description: K1/heat contactor

Purpose: Supplies power to the heating elements when 24V DC signal is sent from the relay board.

Location: To the right of the circuit breaker in the slide out control compartment

NOTES: The coil of the contactor should read 6 ohms.

Element Assemblies with Gasket Kits:

53004 (12Kw 208V) – 7 ohms
53005 (12Kw 220/440V) – 8 ohms
53006 (12Kw 240/480V) – 9.5 ohms
53280 (14Kw 208V) – 6 ohms
53281 (14Kw 220/440V) – 7 ohms
53282 (14Kw 240/480V) – 8.5 ohms

Description: AC element assembly

Purpose: Heating of the oven cavity

Location: Inside the oven cavity at the rear of the unit behind the rear baffle

NOTES: Elements should read the following ohms (+/- .5) from T1 to T2, T2 to T3 and T1 to T3 at the contactor with the contactor open.

Description: Inverter drive

Purpose: Motor controller

Location: Below the motor drive braking resistor in the slide out control compartment

NOTES: The inverter closes the drive@speed relay built in to the J1000, whenever it sends poer to the motor. As long as the motor’s thermal switch(s) are closed, the drive@speed 24V DC return signal is sent to the relay board. If the relay board has sent fan speed outputs (J2.9 – J2.12) and the drive@speed 24V Dc signal is not present at J11.4 the control triggers a “Fan Error”.

Inverter Details
Inverter Programming
Inverter Troubleshooting

Description: 220 volt 1/2 HP motor

Purpose: Convection air circulation for the oven cavity

Location: At the rear of the unit above the cavity intake vent

NOTES: Motor winding ohms:
Blue to Black 6.2 ohms
Brown to Black 6.2 ohms
Brown to Blue 6.2 ohms
Thermal switch opens at 302 degrees F (See inverter details above for more information).

Description: TB4/terminal block 4

Purpose: Distribution of the 24V DC power to the relay board and component – 24VDC

Location: Above the motor braking resistor in the slide out control compartment

NOTES:  This terminal block is used as return reading for 24VDC troubleshooting.

Description: Controller

Purpose: Main controller and interface used for cooking and programming

Location: Front of the oven on the right hand side

Programming Quick Guide
Complete Controller Outline
Counters and USB Functions
Controller Error Codes

Description: Door switch assembly

Purpose: Electrically registers the door position

Location: Front of the oven on the right hand side mounted behind the lower cover panel on the right of the door turnbuckle assembly.

NOTES: The door switch should read closed when the door is closed and open when the door is open between common and normally open.

Description: Relay or input/out board

Purpose: Transmits oven inputs and outputs under the direction of the controller

Location: Front of the oven on the right hand side mounted behind the controller in the slide out control compartment.

NOTES: The relay board is a key location to verify and test outputs to the oven and inputs to the control. The relay board has red LEDs that indicate what components have a call from the controller for activation.

Relay Board Test Points
Relay Board Guide
3D relay Board

Description: Oven cavity probe

Purpose: Temperature sensor for oven cavity

Location: In front of the blower wheel in the rear of the oven

NOTES: The cavity probe uses resistance to report the oven cavity temperature to the controller

Probe Diagnostic Kit 54379 Instructions
Probe Ohm Chart

Description: Inverter heat sink probe/cooling probe

Purpose: Temperature sensor for cooling fan (axial fan) operation

Location: Under the motor inverter heat sink, behind the relay board, on the slide out control panel

NOTES: The cooling probe uses resistance to report the inverter heat sink temperature to the controller

Probe Diagnostic Kit 54379 Instructions
Probe Ohm Chart

Description: Quench probe

Purpose: Temperature sensor for the drain water. Used to signal when cold water must be added to the exiting hot water to prevent overheating the drain

Location: Under the motor in the quench box, at the rear of the unit

Probe Diagnostic Kit 54379 Instructions
Probe Ohm Chart

Description: Meat probe/core probe

Purpose: Temperature sensor for product based temperature controlled operation

Location: Separate from the unit, plugs into the probe port in the front control panel. (The probe port is highlighted)

NOTES: The core probe uses resistance to report the product internal temperature to the controller

Probe Diagnostic Kit 54379 Instructions
Probe Ohm Chart

Description: 24 FCD water manifold assembly

Purpose: Control and distribution of the water supply

Location: At the bottom center of the slide out control compartment

NOTES: Each solenoid should read 178 ohms across the coil. The spritzer solenoid (top) feeds the spritzer tube in the rear of the oven cavity. (See below) Check for blockages at the tube if water issues arise.

Spritzer Tube Location

Description: 24 VDC cavity vent solenoid

Purpose: Operates the cavity vent

Location: Below the motor at the rear of the unit

NOTES: The cavity vent solenoid should read 30 ohms across the coil. The “Cavity Vent” is an intake, all exhaust air should exit the tube in the upper right at the rear of the oven. If the exhaust vent is plugged, the cavity vent may send hot air into the motor causing motor problems.

Description: 24 VDC cooling fan/axial fan

Purpose: Cooling of the control compartment

Location: To the left of the DC power supply on the slide out control compartment

NOTES: The fan draws the air from the rear and directs it towards the DC power supply and the motor inverter. The motor should read 3.7 ohms across the winding. It is important that the fan pull clear air in at the back of the unit, if grease or contaminant laden air is injected into the unit, it an cause failures. If the fan fails, the inverter drive will overheat, and trigger a fan error.

Description: 3 button PCB

Purpose: User interface

Location: At the top of the control panel on the right front of the unit

NOTES: The 5V DC power to the board can be read across the red and black wires.