Vollrath FlexVent User manual

©2022 The Vollrath Company L.L.C. 7/15/2022
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F S
O
INSTALLATION MANUAL

ii
Model FC-6DV | Installation Guide
© 2022 The Vollrath Company L.L.C. | Part No. 354139 | 7/12/2022
O
FlexVent™ versatile slide-in
with downdraft vent system
and fire suppression
SAFETY INFORMATION
This manual provides information for safely configuring, installing, operating, and maintaining FlexVent™. Always follow guid-
ance from the Authority Having Jurisdiction (AHJ) for regulation and code compliance.
DO NOT install or operate the unit until all safety information and instructions are thoroughly read and understood. Installation
and startup must be performed by a qualified technician. The warranty will be void if the unit is not installed correctly.
NOTE: This product is UL Recognized. UL Recognized components are incomplete in certain constructional features and
require professional installation and subsequent evaluation to relevant standards prior to commissioning.
For your safety, please observe the following precautions when installing, operating, or servicing FlexVent™.
WARNING indicates a potential hazard that can or will cause severe injury or death.
CAUTION indicates a potential hazard that can cause minor or major injury.
NOTE: indicates important information.
WARNING  HAZARDOUS VOLTAGE
• Failure to disconnect unit from electrical supply before any servicing could result in death, serious injury, or
equipment damage.
• Unit must be installed by qualified personnel in accordance with applicable codes and ordinances.
• Install and use Recognized electrical components and grounded electrical outlets matching each intended
cooking appliance’s nameplate rated voltage.
• Ensure breaker panel service, circuit breaker, and wiring is appropriate for all intended cooking appliances and
configurations.
• Do not steam clean, spray, or pour liquids on any part of the unit.
• Unit must be installed and secured level to the enclosure.
• Do not use extension cords for appliances.
• Before cleaning or maintenance, turn the unit o and disconnect the electrical supply.
• Always attend the unit when in operation.
• Do not operate the unit if damaged or malfunctioning.
WARNING  COMBUSTION & FIRE HAZARDS
• Do not attach ductwork to the Recirculating System exhaust; it is designed to prevent a fire from spreading
outside of the unit.
• Ensure all flammable substances and vapors are stored away from this unit and other appliances.
• Ceiling height must be at least 96”.
• Do not modify or in any way circumvent or defeat the Interlock Box as factory wired.
• Appliances and configurations must conform to Cooking Appliance Constraints noted in this manual.
• AHJ approvals are required for all potential appliances and configurations upon initial installation.

iii
Model FC-6DV | Installation Guide
© 2022 The Vollrath Company L.L.C. | Part No. 354139 | 7/12/2022
WARNING
• Improper installation, adjustment, alteration, service or maintenance could result in serious injury, equip-
ment or property damage, and may void the factory warranty.
• This product may contain chemicals know to the state of California to cause cancer, birth defects, or
other reproductive harm. For more information go to www.p65warnings.ca.gov.
CAUTION
• Avoid impact to the Touch Panel surface; damage may cause unit malfunction.
• Filters should not be altered in any way; damaged filters must be replaced prior to operation.
• DO NOT clean with corrosive chemicals, products containing chlorine, oven cleaners, or abrasive
cloths or cleaners.
• DO NOT alter, add attachments or modify this unit unless specified in this manual.
• Ensure the enclosure provides adequate ventilation as specified in this manual.
NOTE  UNPACKING & INSTALLATION
• Ensure there is enough space to unpack; there will be layers of protective packaging.
• Use care when unpacking to prevent the unit from tipping and being damaged.
• Immediately inspect the unit and notify the freight company if damage is present.
• Remove crating materials, stretch wrap, and packaging. The unit is secured to the pallet; it is often help-
ful to leave the unit on the pallet to facilitate moving to its fabrication location.
• Fabricators and owners are responsible for installation materials not included with purchase.
• Move the unit with appropriate equipment and adequate people to avoid injuries and unit damage.
NOTE: If the unit is removed from the pallet, move using the four mounting pads provided under the
unit. Using other areas to lift will cause damage to the unit. DAMAGE RESULTING FROM IMPROPER
HANDLING WILL VOID THE WARRANTY.
• Remove and retain the envelope that contains included hardware, labels, and documentation.

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TABLE OF CONTENTS
Safety Information .............................................................................................................................. ii-iii
Unpacking & Installation........................................................................................................................iii
Introduction ............................................................................................................................................. 6
Specifications .......................................................................................................................................... 6
Location & Clearance ............................................................................................................................. 7
Description — Main Systems................................................................................................................. 7
Basic Operation Flow Chart................................................................................................................... 7
Functional Description/Systems Overview ......................................................................................... 8
Required Parts Supplied by Installer.................................................................................................... 9
UL Conditions of Acceptability ........................................................................................................... 10
System Overview ................................................................................................................................... 11
Cabinet Constraints & Installation.......................................................................................................12
LED Lighting (Optional).........................................................................................................................13
Cooking Appliance Constraints — Electric Only................................................................................14
Induction ........................................................................................................................................16-17
Fryer ....................................................................................................................................................18
Griddle.................................................................................................................................................19
Wok .....................................................................................................................................................20
Panini/Sandwich Press ....................................................................................................................20
Appliance Nozzle Locations and Setup ..............................................................................................21
Fire Suppression System .....................................................................................................................22
Filters ......................................................................................................................................................23
Maintenance & Service Log .................................................................................................................23
Wiring Diagram & Schematic.........................................................................................................24-26
Troubleshooting ...................................................................................................................................28
Service, Repair & Warranty ..................................................................................................................29

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ITEM FC–6DV-36 MODEL FC–6DV
Dimensions 53 ⁄”W [135.9 cm] X 36 ⁄”H [93.3 cm] X 35 ⁄”D [89.2 cm]
Approximate Weight 250 lbs
Primary Material 18 Ga 300 Series Stainless Steel
Recognitions & Classifications UL 710B Recognized, UL Classified to NSF2
System CFM Lower Airflow Limit 456 CFM
Grease-Laden Effluents per NFPA 96 EPA 202 as prescribed by NFPA 96, <5 mg/m3limit
Clearance Zero Clearance Surround
INTRODUCTION
Carefully review and understand this manual thoroughly before proceeding with installation, commissioning,
and operation of FlexVent™. This unit has been designed for customized over, under, or flush counter instal-
lation in the front or back of the house as determined by the Authority Having Jurisdiction (AHJ). The unit is
UL Recognized and as such, must be completed by a fabricator in compliance with the applicable UL Certifi-
cation, the UL Conditions of Acceptability, and requirements of the AHJ.
NOTE: Full responsibility is assumed by the fabricator, installer, and owner for additional components
and preparation required for UL, NFPA, AHJ, and applicable code compliance. Appliances used with this
unit should be UL and NFPA certified by a Nationally Recognized Testing Laboratory (NRTL).
SPECIFICATIONS
35 1/8
89.2
53 1/2
135.9
35 3/4
90.8
18 1/4
46.4
36 3/4
93.3
29 5/8
75.2

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LOCATION
The space in which FlexVent™ is located is considered to be part of the kitchen. Therefore, regulations
pertaining to a commercial kitchen may apply. These include but are not limited to: fresh air, airflow, air
exchanges, floor area, and proximity to customer seating area. Location of the unit must comply with AHJ
requirements and jurisdiction codes. Total amount of grease or particle euent must be considered based
on location, room size, appliances present, and types of food being prepared. Refer to the Constraints sec-
tion for approximate appliance euents measured when utilizing this unit.
FlexVent has been evaluated for zero clearance surround installation. Ceiling height must be at least 96”.
DESCRIPTION  MAIN SYSTEMS
FlexVent™ Downdraft Recirculating Ventilation Module is for use in commercial cooking and hot food holding ap-
plications. It is primarily constructed of 18 Ga 300 Series stainless steel and consists of:
• Cooking Station that allows for versatile configuration with a variety of cooking appliances
• Ventilation Control and Interlock System
• Recirculating Filtration Ductless Hood Assembly
• Ansul® R-102 Fire Suppression System
BASIC OPERATION FLOW CHART
Vent –Basic Operation Flow Chart
Intake Shroud
Cooking Unit(s)
Particulate Filter
Charcoal Filter
Blower Motor
CONTROL
(Pressure
Sensors)
+Patm
Ventilation
Volume
Vent Duct
-Pstatic
Fire
Damper
Detector
Nozzle

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FUNCTIONAL DESCRIPTION/SYSTEMS OVERVIEW
FlexVent™ has three 165 °F fusible links arranged in a series under the Vent Hood and behind the Particulate
Filters. If any link is actuated, the Fire Suppression System is activated. In the event the Fire Suppression
System is activated (automatically or manually), power to the cooking appliance(s) and fan motor is terminated.
Negative pressure within the plenum is monitored with two pressure switches. One terminates power to the
unit if the pressure is too high (e.g., filtration is obstructed), the other terminates power if pressure is too low
(e.g., filtration wrong or missing, fan not operating properly).
Item System
Description
Components & Specs Function
ACooking
Station
• Adjustable-mount shelf
18 ⁄”D X 35 ⁄” W
• Holds up to three ap-
proved appliances no
more than 80 lbs each or
120 lbs total.
BVentilation
Control and
Interlock
System
• Touchscreen User Interface
(Vollrath® logo glows when unit has power)
• Pressure Control Box, power relay & 30-amp
circuit breaker
• Integral Interlock System
• Controls function, dis-
plays status
• Activates lighting option
• Cuts Cooking Station
outlet power if there is a
pressure error or fire.
CRecirculating
Filtration
Ductless Hood
Assembly
• Hood, plenum, and ductwork — stainless steel
• Bae type grease filters — stainless steel (2)
Item # 352035-2, UL File R37947*
• Activated carbon particulate air filters (2) Item #
352010-1*
• Recirculating fan
• Fire Damper
• Captures grease
• Filters grease particles*
• Filters small particles and
light odors*
• Interlock
DUL 300
Automated
Fire Sup-
pression
System**
Pre-plumbed
for ANSUL
R-102 wet
chemical
suppression
system
• Piping
• Plenum discharge nozzles 1W
• Fire Detection Links 165 °F, Fusible (3)
• Appliance Discharge Nozzles 1W***
• 1 ⁄ gal ANSULEX low pH Liquid Fire Suppressant
• Manual Pull
• Interlock Control Box supplied with power relay
and 30-amp circuit breaker
• Automatic and manual fire
suppression
• Distribution of suppres-
sant inside plenum, be-
hind grease filters, and for
cooking appliances
• Interlock cuts power to
unit and cooking appli-
ances if fire is detected
*Vollrath specified filters must be used as replacements to optimize performance.
**The Fire Suppression System, field installation, set-up, testing and final charging shall be provided by
an authorized ANSUL Distributor/Dealer and is the sole responsibility of the purchaser.
***Do not adjust nozzle angles; they are factory set for optimal fire suppression.

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A
B
C
D
Final product may not appear as depicted.
REQUIRED PARTS SUPPLIED BY INSTALLER
Fire Suppression System • ANSUL LT-20-R Cartridge*
• ANSUL 1 ⁄ gals of ANSULEX low pH Liquid Fire
Suppressant*
*Supplied by ANSUL Representative
Electrical • Circuit breaker box
• Circuit breakers
• Appliance outlets
• Appliance conduit and wiring, etc. for customized
configuration
Mechanical • Cabinet surround & countertop
• Ventilation cover — Separate Vollrath® purchase or
fabricator provided. Must be removable and en-
able complete access for service. The cover must
provide a minimum of 80 square inches of open
area for proper ventilation and exhaust.

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UL CONDITIONS OF ACCEPTABILITY
The following are among the considerations to be made in judging the acceptability of the table assembly:
1. The Downdraft Table is to be used in conjunction with up to three Listed commercial cooking appliances.
See “COOKING APPLIANCE CONSTRAINTS” Ills. 1-6 for specific cooking appliances that can be used and
on which shelf height. Total electrical load does not exceed 50 A for all appliances combined (based on
contactor employed). Downdraft units are marked with these details including shelf height.
2. The acceptability of the installation of the downdraft table assembly shall be determined under end-product
application. The downdraft assembly shall be adequately enclosed to render inaccessible all or any parts
of the equipment that involve a risk of electric shock or injury to persons, and preclude propagation of
flame initiated by electrical disturbances occurring within. The assembly shall meet relevant end-product
requirements, including the enclosure, accessibility of uninsulated live and/or moving parts that may involve
a risk of electric shock and fire, and/or injury to persons, respectively, spacings and segregation, grounding,
polarization, and marking requirements under the end-product application.
3. In addition, the acceptability of the use of the downdraft table assembly shall be made in conjunction with
the end-product requirements specified in the Standard for Commercial Electric Cooking Appliances, UL
197, for UL Listing (UL).
4. The acceptability of the supporting/mounting means and securement of the downdraft table assembly shall
be determined under the end-product application.
5. The downdraft assembly terminations and wiring shall be suitable, protected from damage and sharp edges,
etc., and enclosed. In addition, any flexing or movement of the leads/wiring during normal operation or any
user servicing shall be investigated and determined to be acceptable.
6. The downdraft table assembly shall be provided with suitable grounding/bonding means under the end-
product application.
7. The following tests have been conducted in accordance with UL 710B on the covered downdraft table
with griddle assembly: Power Input (Rating), Normal Temperature (Normal), Dielectric Voltage-Withstand
(Dielectric Strength), Insulation Resistance, Grounding and Bonding, Stability, Strain Relief, Push-Back Relief.
Consideration shall be given to re-conducting any of the tests above with other end-product appliances.
8. In addition to the above, the following tests have been conducted in accordance with UL 710B on the cov-
ered downdraft table with griddle assembly and fryer and hot plate: Lower Airflow Determination, Capture,
Emissions (EPA 202), Fire Extinguishment (General), and Fire Extinguishment (Griddles). Consideration shall
be given to re-conducting any of the tests above with end-product griddle paying attention to Griddle Watt,
Griddle size, Griddle max temperature, and maximum food load and throughput.
9. The end-product report shall include a detailed description of the downdraft table including specific mark-
ings for applicable cooking appliances that may be used. Also includes the details for the cooking appliance
shelf height for each appliance.
10.The covered Downdraft table assembly component is intended to be factory installed only.
11. If legs/feet or casters are not provided as part of the Recognized Component table, the supporting means
should be evaluated in the end use and Stability Test should be considered.

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SYSTEM OVERVIEW
2 FlexVent™ Versatile Slide-In with Downdraft Vent System and Fire Suppression Operator’s Manual
SYSTEM OVERVIEW
The FlexVent™ unit consists of three integrated systems:
• FlexVent Ventilation and Filtration System
• Fire Detection System
• ANSUL® R-102 Restaurant Fire Suppression System
A. Discharge Nozzles — Appliance (2)
B. Grease Filters (2)
C. Grease Tray (1)
D. Manual Pull Station
E. Fire Suppression System Arming View Window
F. 1.5 Gallon Ansulex R-102 Tank, Ansulex Fire Suppressant*
G. Electrical Outlets*
H. Pressure Control**
I. Interlock Box**
J. Circuit Breakers and Box*
K. User Control
L. Nitrogen (N) Cartridge LT-20-R*
M. ANSUL Automan Regulated Release Assembly
N. Fan Motor
O. Vent Hood
P. Plenum Assembly
Q. Damper Assembly
R. Discharge Nozzles (Duct) (2)
S. ANSUL Detector Brackets w/ Fusible Links (3)
T. Lift and Mounting Pads
*Supplied and installed separately.
**For service technician use.
D
K
B
F
J
E
C
G
H
IL
A
O
P
N
M
Q
RS
T

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32 1/2
82.6
52 1/2
133.4
53 5/8
136.2
28 7/8
73.2
TOP OF
COUNTERTOP
COUNTERTOP
BASE
DIMENSIONS RESULT IN APPLIANCE 7/8" [2.2 CM] ABOVE
COUNTERTOP. APPLIANCE OVERLAPS COUNTERTOP
APPROXIMATELY 1/2" [1.3 CM] ON ALL SIDES.
CABINET CONSTRAINTS & INSTALLATION  ZERO CLEARANCE SLIDEIN
OVER COUNTER
FLUSH WITH COUNTER
UNDER COUNTER
32 1/2
82.6
52 1/2
133.4
53 5/8
136.2
28 7/8
73.2
TOP OF
COUNTERTOP
COUNTERTOP
BASE
DIMENSIONS RESULT IN APPLIANCE 7/8" [2.2 CM] ABOVE
COUNTERTOP. APPLIANCE OVERLAPS COUNTERTOP
APPROXIMATELY 1/2" [1.3 CM] ON ALL SIDES.
34
86.4
53 5/8
136.2
29 5/8
75.2
COUNTERTOP
BASE
DIMENSIONS RESULT IN 1/8" [0.3 CM] GAP ON ALL SIDES OF
APPLIANCE.
34
86.4
52 3/8
133
53 5/8
136.2
29 7/8
75.9
BOTTOM OF
COUNTERTOP
COUNTERTOP
BASE
DIMENSIONS RESULT IN APPLIANCE UNDER COUNTERTOP.
COUNTERTOP OVERLAPS APPLIANCE APPROXIMATELY 1/2" [1.3 CM]
ON SIDES. COUNTERTOP WILL NOT OVERLAP APPLIANCE IN BACK.

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LED LIGHTING OPTIONAL
By default, the LED switch is disabled and the
switch and indicator will not be visible.
To enable the LED function:
1. With power to touch panel (Vollrath logo lit) and
main power o (no display), press and hold the
system on/o switch AND the LED on/o switch
locations simultaneously for three seconds.
on
light
system on
high pressure
dirty or wrong lter
low pressure
missing or wrong lter
main power
2. Press the LED switch to enable the LED function;
“ON” will display. Press again to disable; “OFF”
will display.
on
light
system on
high pressure
dirty or wrong lter
low pressure
missing or wrong lter
main power
3. Press Main Power switch to exit LED setup mode.
NOTE: When the control is on and the function
enabled, the switch and indicator will be visible.
4. Press the LED switch to turn lights on or off.
NOTE: An LED three-terminal connector with
three wires (L1, N, G) is provided with the unit.
The wires provide 120VAC output for a maximum
100 watt LED power supply when the LED option
is enabled and on. LEDs purchased separately.
Please refer to the wiring diagram.
on
light
system on
high pressure
dirty or wrong lter
low pressure
missing or wrong lter
main power
o
main power
light
Press
&
Hold

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COOKING APPLIANCE GENERAL CONSTRAINTS  ELECTRIC ONLY
• 80 lbs max per appliance
• 120 lbs max distributed shelf load
• Appliances must not overhang shelf
• Cooking surfaces must fall within the Euent Capture and Fire Suppression Boundaries
• 7,200 W maximum, 30 amps, 120 or 240 V
• AHJ approvals are required for all appliances and configurations
• Usable appliance space 18 1/4” D X 35 3/4” W
• Allowable grease discharge per UL 710B and NFPA 96 is 5 mg/m3(0.00018 oz/ft3). No configuration shall
exceed the total allowable discharge.
EFFLUENT CAPTURE AND FIRE
SUPPRESSION BOUNDARIES
(SHELF NOT SHOWN)

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INDUCTION HOB/HOT PLATE CONSTRAINTS  ELECTRIC ONLY
Induction HOB(s)/ Hot Plate(s) Shelf
Position
Max
Temp
Max Watts Pot/Pan
Dia. Max.
1-3 Any* 550 °F 3600/hob — 7200 total 14”
*Shelf positions are top, middle, and bottom.
COOKING
SURFACE
HEIGHT LIMIT

COOKING
SURFACE
HEIGHT LIMIT
 
COOKING
SURFACE
HEIGHT LIMIT
 

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INDUCTION HOB/HOT PLATE CONSTRAINTS  ELECTRIC ONLY (Continued)
Induction HOB(s)/ Hot Plate(s) Shelf Position Max
Temp
Max Watts Pot/Pan
Dia. Max
1-3 Any* 550 °F 3600/hob — 7200 total 14”
*Shelf positions are top, middle, and bottom.
COOKING
SURFACE
HEIGHT LIMIT
 
COOKING
SURFACE
HEIGHT LIMIT
 

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FRYER CONSTRAINTS  ELECTRIC ONLY .66 mg/m3per 15 lb vat
Fryer(s) Max Capacity Shelf Position Max
Temp
Max Watts Max Surface Oil
1-3 15 lbs oil/vat Bottom 375 °F 3600/vat —7200 total 132 sq in/vat
COOKING
SURFACE
HEIGHT LIMIT
 
COOKING
SURFACE
HEIGHT LIMIT
 
COOKING
SURFACE
HEIGHT LIMIT
 

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GRIDDLE CONSTRAINTS  ELECTRIC ONLY
2.95 mg/m3per 396 sq in cooking surface(s)
Griddle(s) Shelf Position Max Temp Max Watts Max Surface Area
1-2 Bottom 550 °F 3600 total 396 sq in
COOKING
SURFACE
HEIGHT LIMIT
 
COOKING
SURFACE
HEIGHT LIMIT

COOKING
SURFACE
HEIGHT LIMIT
 

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INDUCTION WOK CONSTRAINTS  ELECTRIC ONLY
Induction Wok(s) Shelf Position Max Temp Max Watts Max. Pan Diameter
1-2 Bottom 550 °F 3600/hob — 7200 total 14”
COOKING
SURFACE
HEIGHT LIMIT
 
SANDWICH/PANINI GRILL CONSTRAINTS  ELECTRIC ONLY
Sandwich/Panini
Press(es)
Shelf Position Max Temp Max Watts
1-3 Any* 550 °F 3600/press — 7200 total
COOKING
SURFACE
HEIGHT LIMIT
 
*Shelf positions are top, middle, and bottom.
COOKING
SURFACE
HEIGHT LIMIT
