Thermador CVS2 User Manual 2
VENTIL
ATION
INSTALLATION
MODELS: CVS2
MANUAL
SAFETY INSTRUCTIONS
Read All Instructions Before Using the Appliance.
READ AND SAVE THESE INSTRUCTIONS
WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC
SHOCK, OR INJURY TO PERSONS, OBSERVE
THE FOLLOWING:
A. Installation work and electrical wiring must be done
by qualified person(s) in accordance with all applicable codes and standards, including fire-related
construction.
B. Sufficient air is needed for proper combustion and
exhausting of gases through the flue (chimney) of
fuel burning equipment to prevent backdrafting.
Follow the heating equipment manufacturer's
guideline and safety standards such as those
published by the National Fire Protection Association (NFPA), and the American Society for Heating,
Refrigeration and Air Conditioning Engineers
(ASHRAE), and the local code authorities.
C When cutting or drilling into wall or ceiling, do not
damage electrical wiring and other hidden utilities.
D. Ducted fans must always be vented to the outdoors.
E. Always unplug or disconnect the downdraft from the
power supply before servicing.
F. This unit is designed for indoor use only. Use this
unit only in the manner intended by the manufac-
turer.
This unit is manufactured for indoor use only. Do not use
this unit outdoors.
WARNING
CAUTION: For general ventilating use only. Do
not use to exhaust hazardous or explosive materials and vapors.
To reduce risk of fire and to properly exhaust air,
be sure to duct air outside. Do not vent exhaust
air into spaces within walls, ceilings, attics, crawl
spaces or garages.
TO REDUCE THE RISK OF FIRE, USE ONLY
METAL DUCT WORK.
To reduce the risk of fire, electric shock and injury
to persons, ventilator assemblies, All CVS models
must be installed with integral blower, Model
VTN600CV2 or remote blowers model VTR600R
or VTR1000Q. Other ventilator blowers cannot be
substituted.
To reduce the risk of fire or electric shock, do not
use the fan with any solid-state speed control
device.
This appliance has been found to be in compliance with UL507 Standard for Electric Fans and
CAN/CSA-22.2 No. 113 Canadian Standard for
Fans and Ventilators. It is the responsibility of the
owner and the installer to determine if additional
requirements or standards apply in specific
installations.
Parts Needed
• Blower (Remote or Integral)
• Tape Measure
• Phillips Head Screwdriver
• Duct Tape
• Ductwork (configuration varies depending on location;
See pages 4-7 for further information)
• Additional Sheetmetal screws (as necessary for
ductwork installation)
• Transition(s) (style varies depending on ductwork)
Transition box for remote blower installations is available
as an accessory.
• Saw (or equivalent for cutting countertop)
• #8 x 1 1/4" Wood Screws (4)
Parts Supplied
• Downdraft assembly (1)
• #8 Sheetmetal Screws (8)
• Blower Cord Traction Relief (1)
• Hardware for brackets on vent (2)
• Remote Blower Pigtail
Page 1
Figure 1
Top Cap
Internal Blower
(Not Included)
Strain Relief
INTRODUCTION
GENERAL DESCRIPTION
The complete downdraft system consists of the ventilator,
the intake and the blower (See Fig. 1). The blower can be
either integral (mounted on the vent intake in the cabinet
under the cooktop) or a remote (mounted on the roof or
outside wall. When a remote blower is used, a duct transition is mounted on the ventilator intake in place of the
integral blower to connect the intake to the ductwork. The
duct transition must be purchased separately.
The integral blower or duct transition can be mounted in
different positions on the intake to route ductwork to avoid
cabinet, building framing, utilities, etc.
The downdraft system is available in 30-inch, 36-inch and
45-inch models, with countertop trim in either stainless,
black, or white. It is intended for use with all brands and
models of residential 30-inch, 36-inch or 45-inch gas or
electric cooktops except professional style cooktops.
Step 1: PLAN THE INSTALLATION
Carefully follow the planning procedures listed below (See
Figure 2).
A. Determine whether a remote or integral blower will be
used. Remote blower installation requires 4 wires
plus a ground wire to run from the downdraft to the
blower.
B. Make sure that adequate cabinet and counter space
has been provided and that the intake will be accessible
if service is required.
C. Consider that cross drafts created by adjacent open
windows, doors, air conditioning, old heating vents,
recessed ceiling lights, and traffic patterns may affect
performance.
D. For gas cooktop installations make sure that a mini-
mum 10 square inch opening is provided in the toe-kick
or other cabinet area. Inadequate ventilation of the
cabinet below the cooktop may result in flame outage
when operating the vent system.
E. Provide for air supply or "make-up air" to the room
where unit will be installed. If "make-up air" is not
provided, then problems, such as fireplace chimney
downdrafts, could result.
Page 2
Be certain to avoid interference with gas and
electric supply to cooktop.
Shelving and drawer depths are dependent
Cooktop
8"
upon cooktop depth and setback.
2 1/4"
Dimensions are dependent on
discharge direction.
22"
6 1/2"
5 1/2"
14"
Cutout
Depth
Cooktop
Drawer
Shelving must
be removable
SB (see
Fig. 7,8)
Integral/Remote
9-13/16"
A
13"
B
Figure 2
F. Investigate potential ductwork routes and choose the
shortest possible route from the unit to an outside wall
or to the roof via an inside wall and attic. For guidance,
typical ducting installations are shown in figures 3
through 6. Installation in island locations will require
under floor ducting. Peninsula locations usually require
ducting laterally through cabinets or under cabinet toespaces. Consider potential interferences to ductwork
from building framing (floor joists, wall studs, etc.) and
utilities (electrical wiring, water, gas, or sewer lines,
etc.).
G. Determine whether the chosen route of ducting will meet
vent system performance requirements. To do this,
measure the duct lengths needed and determine specific fittings required. Enter this data in the spaces
provided in Table 1 (See Page 6). For duct runs greater
than 100 feet please contact customer service for
performance estimates. In addition, the duct installation
guidelines in Table 2 (See Page 7) should be followed in
developing the ductwork plan.
H. Purchase the necessary ductwork in accordance with
the listing developed in G above.
Page 3
Figures 3 through 6 are examples of possible ducting
Remote Blower
Roof Mount Installation
Duct Transition Box
Integral Blower
Through Wall Installations
Remote
Blower
Integral Blower
Wall Cap
12" Min.
Ground
Figure 3
Through Wall Installation
Integral Blower
Figure 4
Remote BlowerIntegral Blower
Through Wall Installation
3-1/4" x 10" or
8" Duct
End Must Be
Closed and
Sealed
Remote Blower
Duct Transition
Box
10" Collar
Figure 5
BLOWER ROTATED 90° FOR SIDE
CONNECTION
Figure 6
Page 4
NOTE: Fittings with model numbers stated are available through your
Thermador dealer. All other fittings are available from most major
hardware stores.
Page 5
TOTAL (of both columns)=
TABLE 2. DUCTWORK INSTALLATION GUIDELINES
• For safety reasons, ducting should vent directly
outdoors (not into an attic, underneath the house, into
the garage or into any enclosed space).
• Keep duct runs as short and straight as possible.
• Duct fittings (elbows and transitions) reduce air flow
efficiency.
• Back to back elbows and "S" turns give very poor
delivery and are not recommended.
• A short straight length of duct at the inlet of the
remote blower gives the best delivery.
• Transition to duct from the integral blower or remote
duct transition as close to the downdraft as is possible. In order of preference, use
1st. 10" round duct
2nd. 8" round duct
3rd. 3-1/4" x 14" duct
4th. 7" round duct
5th. 3-1/4" x l0" duct
6th. 6" round duct
• The use of flexible metal round duct should only be
used when no other duct fitting exists. Limit use to
short lengths and do not crush when making corners.
• Where local codes permit, plastic pipe (PVC-schedule
40 pipe or ABS pipe 7" or 8" diameter) can be used in
areas of high ground moisture and in slab floors to
eliminate future rusting.
• Use only duct work constructed of materials that are
acceptable by the applicable codes. All duct should
be 26 gauge or heavier to minimize flex due to air flow.
• The remote blowers requires a 10" or 8" diameter
round duct (depending on model) to match the inlet
ring. A transition is necessary from other duct sizes.
• Use sheet metal screws as required to support the
duct weight, and seal all joints with duct tape.
• Be certain that the duct work does not interfere with
floor joists or wall studs.
• Do not exhaust more than one vent into a single duct
run.
• Thermal breaks, such as a short section of nonmetallic duct, should be used in areas of extreme cold.
• Always use an appropriate roof or wall-cap with
damper. Laundry type wall caps should
never be used.
Step 2: Prepare Countertop Cutout
For installation with a Thermador cooktop, refer to Part A (at
left) and Figure 7 (Page 8)). For installation with another
brand of cooktop, refer to Part B (Page 9).
For all installations verify that all cutouts will clear the inside
of the front countertop support rail, and that the cooktop and
vent will be centered left to right within the cutout. Also,
make certain that the front and rear cutouts are straight and
parallel to the front edge of countertop and the rear backsplash and/or wall. Assure that the side cutouts are square
to the front and rear cutouts. All illustrations and dimensions are based on standard 24" deep by 36" high American
style base cabinets with 25" countertops.
When installing laminated or solid surface countertops such
as Surell™ and Corian®, be sure to follow the countertop
manufacturer's instructions regarding minimum corner radii,
reinforcement of corners, etc.
For overhead cabinet and cooktop side clearances
consult cooktop Installation Instructions.
A. For installation with a Thermador cooktop (Figure 7 and
Table 3)
Provide an opening in the countertop as specified in
Table 3 (Page 8). Make sure that the distance from the
front of the countertop to the front of the cutout is not
less than dimension "SB". Verify that the available flat
countertop is greater than dimensions "OW" by "OD".
Make certain that the backsplash thickness does not
exceed dimension "BT".
Page 6
TABLE 2: INSTALLATION DIMENSIONS FOR CVS2 WITH THERMADOR
COOKTOP
Cooktop CW CD OW OD SB BT, Max++
Model No. Cutout Cutout Overall Overall Minimum Backsplash
Width Depth Width Depth Set Back Thickness
30” Cooktops: Installed with CVS230
SGS304* 28-15/16 22-1/4 31 23-3/4 1-1/2 3/4
SGSX304* 28-15/16 22-1/4 31 23-3/4 1-1/2 3/4
CET304 28-3/4 22-1/8 31 23-7/8 2-1/2 0
CEP304 28-3/4 22-1/8 31 23-7/8 2-1/2 0
CEM304 28-3/4 22-1/8 31 23-7/8 2-1/2 0
36”Cooktops: Installed with CVS236
SGS365** 34-15/16 22-1/4 37 23-3/4 1-1/2 3/4
SGSX365** 34-15/16 22-1/4 37 23-3/4 1-1/2 3/4
CET365 34-3/4 22-1/8 37 23-7/8 2-1/2 0
CEP365 34-3/4 22-1/8 37 23-7/8 2-1/2 0
CEM365 34-3/4 22-1/8 37 23-7/8 2-1/2 0
45” Cooktops: Installed with CVS245
SGS456 43-15/16 22-1/4 46 23-3/4 1-1/2 3/4
SGSX456 43-15/16 22-1/4 46 23-3/4 1-1/2 3/4
CET456 43-3/4 22-1/8 46 23-7/8 2-1/2 0
CEP456 43-3/4 22-1/8 46 23-7/8 2-1/2 0
CEM456 43-3/4 22-1/8 46 23-7/8 2-1/2 0
Table 2 Notes
* Dimension "SB" is the minimum distance from the leading
edge of the counter to the leading edge of the cutout.
++Dimension "BT" is the thickness of backsplash that
provides 1/4" clearance between vent and backsplash.
Any backsplash with a curved radius where it meets the
counter will require additional clearance. Thicker
backsplashes may be used by increasing the counter
and cabinet depths.
All dimensions are in inches and are based upon a
standard 24" deep base cabinet with 25" countertop.
* * SGS and SGSX: width in table is at the widest point
(center).
Refer to cooktop Installation Instructions for complete
information prior to making any cutouts.
Clearance is provided to allow raising of the hinged main
top.
INSTALLATION WITH THERMADOR COOKTOPS WHEN SPECIFIED
2 1/4"
CVS245: 43 3/8"
CVS236: 34 3/8"
CVS230: 28 3/8"
Figure 7
Page 7
INSTALLATION WITH OTHER COOKTOPS WHERE SPECIFIED (SEE PART B)
2 1/4"
CVS245: 43 3/8"
CVS236: 34 3/8"
CVS230: 28 3/8"
Figure 8
B. FOR INSTALLATION WITH ANOTHER BRAND OF COOKTOP (Figure 8)
Have the following cooktop measurements available before
proceeding All cooktop dimensions should be verified
through measurement prior to cutting the countertop:
CCW = Cooktop Cutout Width
CCD = Cooktop Cutout Depth
COW = Cooktop Overall Width
COD = Cooktop Overall Depth
with the above dimensions confirmed, determine the cutout
size as follows:
1. Find the cutout width, (CW):
If CCW is smaller than the CVS2 cutout width then:
Installation CW
CVS230 283/8
CVS236 343/8
CVS245 433/8
If CCW is larger than the CVS2 cutout width then:
CW = CCW
See Figure 8 for CVS2 cutout widths and dimension
definitions.
2. Calculate the cutout depth, CD:
Determine the cooktop overhang (CO)
CO = (COD-CCD)/2 (Assumes front and rear cooktop
overhangs are equal) Calculate the cutout depth, (CD):
CD = COD - CO+1-7/8"
3. Determine setback (SB) distance from front of
countertop to front of cutout. SB is specified in the
installation instructions shipped with the cooktop.
4. Backsplash thickness must not exceed BT as
calculated below:
BT = 24 7/8" - OD-SB+CO
(Provides 1/8" clearance between vent and backsplash.)
A negative value for BT means countertop is too small
for the installation.
5. Verify that the available flat countertop has a width
greater than OW and a depth greater than OD.
OW depends on the installation:
CVS230: OW equals the greater of COW or 30".
CVS236: OW equals the greater of COW or 36".
CVS245: OW equals the greater of COW or 45".
OD is determined by: OD=COD+21/8".
6. Cut countertop using dims: CD, CW and SB as
defined in Figure 8.
Page 8
Countertop
Surface
Left Side
Point "P" (Center of Rear Cut-line)
Right Side
Cabinet Back
Plumb line to
intersection A-A
& B-B
Receptacle
Location
Note: Centerlines of
Adjustable Within Range
Rectangular Duct Shown
Figure 9: Cabinet Cutout for Ductwork
Cabinet Cutout Dimensions for Blower:
C D E F G
"8/36"2/141"8/71"2/151"4/39
Table 4: Cabinet Cutout Dimensions
STEP 3: Prepare Duct Cutouts in Cabinet
A. Refer to Figure 9. Drop a plumb-line from Point "P" at
the rear center of the countertop cutout. Mark this point
on the bottom of the cabinet below. Construct two
reference lines through this point: one should be parallel
to the cabinet front and directly below the rear countertop cutout (Line A-A), and the other (Line B-B) should
be at right angles to A-A.
E
Cabinet Bottom Shelf
wall studs, floor joists, utilities, or other obstructions.
C. Temporarily set intake and cooktop in place and attach
integral blower (or duct transition fitting if a remote
blower is installed). Refer to steps 6 and 7. Verify that
the duct cutouts as marked will match the hardware
installation. Adjust the duct cutout as necessary to
match hardware installation.
B. Using these reference lines as a base for the measure-
ments shown in Table 4, layout the necessary cabinet
cutouts needed to implement the planned ductwork
route. Where a range of measurements is noted,
choose a measurement that allows best clearance from
D. Remove temporarily placed hardware and make cutouts
in cabinet to accommodate ductwork installation.
E. Make all other cabinet modifications needed to provide
proper clearances for drawers or removable shelving.
Page 9
Step 4: Install Ductwork (Remote Blower,
If Used)
A. Install the ductwork and remote blower (if used) in
accordance with the ductwork routing plan developed in
Step 1.
B. Make sure that the installation complies with all installa-
tion guidelines in Table 2. Also check that the opening
where duct passes through outside wall or roof has
been properly flashed and sealed to prevent leakage.
C. If using Integral Blower, Model VTN600CV2C, proceed to
Step 5.
D. If using Remote Blower Model VTR600R or VTR1000Q,
refer to Installation Instructions with that model.
Step 5: Install Electrical Service
Check your local building codes for proper method of installation. In the U.S., if there are no applicable local codes,
this unit should be installed in accordance with the National
Electric Code ANSI/NFPA No. 70, Current Issue. (In
Canada, installation must be in accordance with the CAN 1B149.1 and .2 - Installation Codes for Gas Burning Appliances and/ or local codes).
Step 6: Mount Vent and Cooktop
A. Remove grease filters and any packing materials from
inside the intake.
B. Set the vent intake into rear of countertop opening.
Carefully lower it into position so that the flanges on the
rear sides and edges fully support the unit hanging from
the countertop.
C Hold the unit against the rear of the countertop opening,
and slide the leg brackets down to meet the bottom of
cabinet. Check and adjust for plumb, then fasten leg
brackets to cabinet with hardware provided.
D. Place the cooktop in countertop opening with the rear
edge of cooktop overlapping the front edge of the vent.
Make sure rear edge of cooktop does not bind
against front of snorkel. Follow the manufacturer's
installation instructions for installing gasket strips,
protective heat tape (if required), securing the cooktop
to the countertop and making the cooktop electrical
and/or gas connections.
The appliance must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric
shock by providing an escape wire for the electric current.
This appliance is equipped with a cord having a grounding
wire with a grounding plug. The plug must be plugged into
an outlet that is properly installed and grounded.
WARNING - Improper grounding can result in a risk of
electric shock.
Consult a qualified electrician if the grounding instructions
are not completely understood, or if doubt exists as to
whether the appliance is properly grounded.
Do not use an extension cord. If the power supply cord is
too short, have a qualified electrician install an outlet near
the appliance.
The receptacle should be located under the countertop so
that the 30 inch long power cord from the vent will reach it.
See Figure 9. The cord should be routed beneath the
appliance and away from heat generated by the cooktop.
Access should not be obstructed by blower, cabinet work,
ductwork or electrical/gas utilities for the cooktop. All power
for the vent system (including the remote blower, if used) is
supplied via the cord to the intake unit. The outlet can
usually be extended from another kitchen outlet or have its
own circuit from the main service panel.
Do not plug vent cord into receptacle until Step 8.
Page 10
Step 7: Mount Integral Blower or
Outlet Duct Transition for Remote Blower
Integral Blower VTN600CV2C (See
Figures 10 and 12 for further detail):
A. Attach blower in front of round exhaust
outlet with 4-6 (depending on configuration) #8 sheetmetal screws
B. Feed cord from blower through strain
relief.
C. Secure strain relief with screws.
D. Attach strain relief to downdraft near
junction box.
E. Connect cord to downdraft at 6 pin con-
nector
F. Connect blower to ductwork.
Figure 10 - Internal Blower
6 Pin
Connector
Remote Blower VTR600R or VTR1000Q
(See Figures 11 and 12 for further detail):
A. Remove junction box cover and connect
conduit with 5 wires from remote blower.
Hook up wires per Wiring Diagram,
Fig. 10. Replace junction box cover.
B. Attach duct transition at mounting holes
with sheetmetal screws.
C. Feed remote blower pigtail through strain
relief.
D. Attach strain relief to downdraft near
junction box.
E. Connect pigtail to downdraft at 6 pin
connector.
F. Run pigtail wires to junction box.
G. Inside junction box, connect conduit with
five wires from remote blower. Use a
conduit connector to secure.
Note: Blower and duct transition box may be
installed with duct outlet left, down or
right. Install blower or duct transition in
such a way that access panels can be
removed for service.
Internal Blower
Strain Relief
Figure 11 - Remote Blower
6 Pin Connector
Junction Box
Transition
CV2T6
Page 11
Strain Relief
Remote Blower
Pigtail
Conduit To
Remote Blower
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