Thermador UCV30 User manual

For Universal Cook 'N' Vent®Downdraft System
SERVICE
MANUAL
Models
30" UCV30
36" UCV36
45" UCV45

Table of Contents
Introduction..................................................................................... 1
Important Safety Instructions .......................................................... 2
Features .......................................................................................... 3
Operation ........................................................................................ 4
Care and Cleaning .................................................................... 5 – 6
Customer Services .......................................................................... 6
Troubleshooting Installation ............................................................ 7
Examples of Possible Ducting ......................................................... 8
Ventilator Performance Calculator .................................................. 9
Ductwork Installation Guidelines .......................................... 10 – 15
Technical Information .................................................................... 16
Component Description................................................................ 17
Control PCB .................................................................................. 18
D.C. Motor .................................................................................... 19
Motor Step-down Transformer ...................................................... 20
Up Limit Switch ............................................................................. 21
Down Limit Switch......................................................................... 22
Interference Switch........................................................................ 23
Trouble Shooting................................................................... 24 – 29
Disassembly .......................................................................... 30 – 40
Access Cover................................................................................. 30
Lower enclosure front panel.......................................................... 31
Relay Board ................................................................................... 32
Lower enclosure, top cover........................................................... 33
Switch Assembly ........................................................................... 34
Step-down transformer ................................................................. 35
Interference Switch........................................................................ 36
Snorkel Assembly .......................................................................... 37
Motor ............................................................................................ 38
Slides ............................................................................................. 39
Blower assembly and support legs: .............................................. 40
Wiring Diagram ............................................................................. 41

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Page 2

Page 3

Page 4

Page 5

Page 6

Page 7
Troubleshooting
Installation

Page 8
Examples of Possible Ducting

Page 9
Ventilator Performance Calculator

Page 10
Ductwork Installation Guidelines

Page 11
Ductwork Installation Guidelines

Page 12

Page 13

Page 14
PCB Relay For UCV Component Description
The PCB relay for the snorkel is a micro-processor based control. Simply stated, the control uses a CPU (central
processing unit) to detect Switch status and to apply the appropriate polarity (negative or positive) To the DC
motor to run the snorkel in the down or up position respectively.
The switches used to signal the CPU are:
Up limit switch: closes when snorkel reaches top position. down limit switch; closes when the snorkel
reaches the down position.
Interference switch: opens when the snorkel travel is obstructed. The snorkel will reverse direction until
the switch closes. Once the obstruction is removed, and the snorkel button is pressed, the snorkel will
travel in the up direction.
Here’s how it works:
Based upon the status of the 3 switches, the control PCB powers up the DC motor (in the positive or the
negative polarity) when the snorkel button is pressed.
Example:
When the snorkel button is pressed (upward and downward travel):
With the snorkel in the down position, the down limit switch (N.O.) is closed; the up limit switch (N.O.) is open;
the interference switch (N.O.) is also closed. The CPU detects this combination of switches and applies positive
(+) polarity to the dc motor. The snorkel will travel upward.
With the snorkel in the up position, the down limit switch (N.O.) is open; the up limit switch (N.O.) is closed; the
interference switch (N.C.) is also closed. The CPU detects this combination of switches and applies negative (-)
polarity to the DC motor. The snorkel will travel downward.
Technical Information

Page 15
Snorkel in down position: Ready to travel up
Snorkel in up position: Ready to travel down

Page 16
Technical Information
MODELS
UCV30
UCV36
UCV45
Voltage
120 V.A.C. Input To Primary Of Stepdown Transformer
Input To Wire Connector On PCB
24 V.A.C Output From Secondary Side Of Transformer To PCB
24 V.D.C Output From PCB To Motor
5 V.D.C. Internal Voltage In PCB To Activate Relay Coils
1 V.D.C. Output From PCB To LEDs
2 V.D.C. Output From PCB To LEDs
60 Hertz
15 Amp Circiut Required
Installation
With Thermador Cooktop
With Another Brand Of Cooktop
Ventilators
VTRl000Q Or VTR600R Remote Ventilators
Vtn600cva Integral Ventilator
Components
Electrical
24 Volt D.C. Motor
120 V.A.C. To 24 V.A.C. step down transformer for motor
Down Limit Switch (N.O.)
Up Limit Switch (N.O.)
Interference Swrltch (N.O.)
Relay Board
Control Board
Mechanical
Drive Assembly
Left Slide Support
Right Sllde Support
Adjustment Bracket
UCV Description
The UCV System Is Comprised Of 4 Sections;
The Blower Assembly
Lower Enclosure Assembly
Counter Trlm Assembly
The Snorkel Assembly

Page 17
Component Description
Relay PC
The following components are mounted on the relay board;
5 Relays
1 Step-down Transformer
4 Pin Connectors.
1 External Wire Connector
There is a step-down transformer on the PCB that receives 120 V.A.C. and steps down to 12
V.A.C. a series of zenner diodes then rectifies these 12 V.A.C. to 12 V.D.C. to activate the five
relay coils. The five relays control the following components:
Relay # 1 output to motor for up travel
Relay # 2 output to motor for down travel
Relay # 3 high speed output for motor (vent)
Relay # 4 medium: speed output for motor (vent)
Relay # 5 low speed output for motor (vent)
The four pin connectors are input/output connectors. They are numbered: J2, J3, J4, J6 and
supply the following:
J2 OUT supplies 24 V.D.C. to motor
J3 OUT/IN supplies D.C. volts to LED lights, and supplies input to relay
board from control PCB.
J4 OUT supplies current to the up/down limit switches
J6 OUT/IN supplies 120 V.A.C. to the transformer; the transformer steps down to 24 V.A.C.
and sends the current back to the relay board.
TERMINAL BLOCK
The terminal block has six taps that accept external wire leads. The taps are marked; line,
neutral, neutral, high, medium, low, and supply power supply and the three motor speeds.

Page 18
Control PCB
The Control board sends commands to the relay board to operate
according to the user's selection.
Snorkel Up/
Down button
Blower
Controls