TROX VFL CAV Controllers Instruction Manual
- June 12, 2024
- TROX
Table of Contents
TROX VFL CAV Controllers
Product Information
- Product Name: Type VFL Volume Flow Limiter
- Manufacturer: TROX GmbH
- Address: Heinrich-Trox-Platz 47504 Neukirchen-Vluyn Germany
- Phone: +49 (0) 2845 2020
- Fax: +49 (0) 2845 202265
- Email: trox@trox.de
- Website: http://www.troxtechnik.com
Product Usage Instructions
The Type VFL volume flow limiter is used for the balancing of volume flow rates in ventilation systems. It prevents the volume flow rate from exceeding the setpoint and maintains the flow rate even if the pressure keeps fluctuating.
Important Notes:
- Do not use CAV controllers in extract air systems in commercial kitchens unless the extract air has been cleaned as much as possible with high-efficiency aerosol separators; see VDI 2052.
- Installation in humid rooms, areas with potentially explosive atmospheres, or rooms with dust-laden or aggressive air has to be assessed beforehand because it depends on the actual conditions on site.
Contact TROX Technical Service
To ensure that your request is processed as quickly as possible, please
provide the following information:
- Product name
- TROX order number
- Delivery date
- Brief description of the fault
Online: http://www.troxtechnik.com
Phone: +49 2845 202-400
Qualified Staff
HVAC technicians are individuals who have sufficient professional or
technical training, knowledge, and actual experience to enable them to work on
HVAC systems, understand anypotential hazards related to the work under
consideration, an recognize and avoid any risks involved.
Personal Protective Equipment
Personal protective equipment must be worn for any work in order to reduce
health or safety hazards to the minimum. The appropriate protective equipment
for a job must be worn for as long as the job takes.
- Industrial safety helmet
- Safety shoes protect the feet against crushing, falling parts,
and slipping on slippery ground.
Limitation of Liability
The information in this manual has been compiled with reference to the
applicable standards and guidelines, the state of the art, and the
manufacturer’s expertise and experience of many years. The manufacturer does
not accept any liability for damages resulting from:
Assembly instructions
TROX GmbH
Heinrich-Trox-Platz 47504 Neukirchen-Vluyn Germany
Phone: +49 (0) 2845 2020
Fax: +49 (0) 2845 202265
E-mail: trox@trox.de http://www.troxtechnik.com
CAV controllers
VFL
Product overview
Fig. 1: Volume flow limiter Type VFL
- Damper blade
- Bellows inlet
- Bellows
- Crossbar
- Volume flow rate scale Ä Fig. 5
Important notes
Information on the installation manual
This manual enables operating or service personnel to correctly install the
product described below and to use it safely and efficiently.
It is essential that these individuals read and fully understand this manual
before starting any work. The basic prerequisite for safe working is to comply
with the safety notes and all instructions in this manual.
The local regulations for health and safety at work and general safety
regulations also apply.
Correct use
The Type VFL volume flow limiter is used for the balancing of volume flow
rates in ventilation systems. VFL prevents the volume flow rate from exceeding
the setpoint and maintains the flow rate even if the pressure keeps
fluctuating.
Do not use CAV controllers in extract air systems in commercial kitchens
unless the extract air has been cleaned as much as possible with high-
efficiency aerosol separators; see VDI 2052.
Installation in humid rooms, areas with potentially explosive atmospheres or
rooms with dust-laden or aggressive air has to be assessed beforehand because
it depends on the actual conditions on site.
TROX Technical Service
To ensure that your request is processed as quickly as possible, please keep
the following information ready:
- Product name
- TROX order number
- Delivery date
- Brief description of the fault
Online www.troxtechnik.com
Phone +49 2845 202-400
Qualified staff
HVAC technician
HVAC technicians are individuals who have sufficient professional or technical
training in the field they are working in to enable them to carry out their
assigned duties at the level of responsibility allocated to them and in
compliance with the relevant guidelines, safety regulations and instructions.
HVAC technicians are individuals who have in-depth knowledge and skills
related to HVAC sys-tems; they are also responsible for the professional
completion of the work under consideration.
HVAC technicians are individuals who have sufficient professional or technical
training, knowledge and actual experience to enable them to work on HVAC
systems, understand any potential hazards related to the work under
consideration, and recog-nise and avoid any risks involved.
Personal protective equipment
Personal protective equipment must be worn for any work in order to reduce
health or safety haz-ards to the minimum.
The appropriate protective equipment for a job must be worn for as long as the
job takes.
Industrial safety helmet
Industrial safety helmets protect the head from falling objects, suspended
loads, and the effects of striking the head against stationary objects.
Protective gloves 
Protective gloves protect hands from friction, abrasions, punctures, deep cuts, and direct contact with hot surfaces.
Safety shoes 
Safety shoes protect the feet against crushing, falling parts, and slipping on slippery ground.
Limitation of liability
The information in this manual has been compiled with reference to the applicable standards and guidelines, the state of the art, and our expertise and experience of many years.
The manufacturer does not accept any liability for damages resulting from:
- Non-compliance with this manual
- Incorrect use
- Operation or handling by untrained individuals
- Unauthorized modifications
The actual scope of delivery may differ from the information in this manual for special constructions, additional order options or as a result of recent technical changes.
Transport and storage
Delivery check
Upon delivery, carefully remove the packaging and check the unit for transport
damage and complete-ness. In case of any damage or an incomplete ship-ment,
contact the shipping company and your sup-plier immediately. Put the product
back into its packaging after the delivery check to protect it from dust and
contamination.
Fixing and installation material
Fixing and installation material is not part of the supply package (unless
stated otherwise), but has to be provided by others; it has to be suitable for
the installation situation.
Transport on site
CAUTION!
Danger of injury from sharp edges, sharp corners and thin sheet metal parts!
Sharp edges, sharp corners and thin sheet metal parts may cause cuts or
grazes.
- Be careful when carrying out any work.
- Wear protective gloves, safety shoes and a hard hat.
Please note:
- Be careful when unloading or moving the product, and pay attention to the symbols and information on the packaging.
- If possible, take the product in its transport packaging up to the installation location.
- Use only lifting and transport gear designed for the required load.
- Always secure the load against tipping and falling.
- Do not move bulky items just by yourself. Get help to prevent injuries and damage.
Storage
Please note:
- Store the product only in its original packaging
- Protect the product from the effects of weather
- Protect the product from humidity, dust and contamination
- Storage temperature: -10 °C to 50 °C.
- Relative humidity: 95% max., no condensation
Packaging
Properly dispose of packaging material.
Technical data
| Nominal sizes | 80 – 250 mm |
|---|---|
| Volume flow rate range | 4 – 212 l/s or 14 – 764 m³/h |
| Volume flow rate control range | < 20 – 100% of the nominal volume flow rate |
| Volume flow rate accuracy | approx. ± 10% of the nominal volume flow rate |
| Minimum differential pressure | 30 Pa |
| Maximum differential pressure | 300 Pa |
| Operating temperature | 10 – 50 °C |
Dimensions and weight
Fig. 2: VFL
Product-specific data for VFL** Nominal size| ØD [mm]| L
[mm]| m [kg]**
---|---|---|---
80| 78| 86| 0.10
100| 98| 100| 0.15
125| 122| 118| 0.25
160| 156| 148| 0.40
200| 196| 175| 0.50
250| 246| 220| 0.70
Installation
Installation orientation
- The airflow direction is critical.
- The installation orientation is not critical.
Upstream conditions
The volume flow rate accuracy of CAV controllers applies to a straight
upstream section of the duct. Bends, junctions or a narrowing or widening of
the duct cause turbulence that may affect volume flow rate measurement.
Depending on the respective installation situation, information on the
straight duct section upstream of the control unit must be observed.
Duct connections, e.g. branches off the main duct, must comply with EN 1505.
Fig. 3: Bend
A bend with a curvature radius of at least 1D – without an additional straight duct section upstream of the CAV controller – has only a negligible effect on the volume flow rate accuracy
Fig. 4: Junction
A junction causes strong turbulence. The stated volume flow rate accuracy Δ can only be achieved with a straight duct section of at least 1.5D upstream. If there is no straight upstream section, the control may not be stable, even with a perfo-rated plate.
Note: If you intend to install a shut-off damper upstream of the CAV controller, be sure to install the damper in Wird vor dem KVS-Regler in Anströmrichtung eine Absperrklappe eingebaut, ist darauf zu achten, dass die Absperrklappe so einge-baut wird das deren Klappenachse gegenüber der Klappenachse des KVS-Reglers um 90° verdreht angeordnet ist.
Setting the flow rate setpoint
Tool:
Torx T9 screwdriver (by others) 
Fig. 5: Setting the flow rate setpoint
- Use the Torx screwdriver to set the required volume flow rate setpoint on the scale (Ä sticker).
Fig. 6: Covering the slotted hole - Cover the slotted hole with the provided clear sticker; this is required to improve the acoustic properties.
Installing the CAV controller
Personnel:
- HVAC technician
Protective equipment:
- Industrial safety helmet
- Protective gloves
- Safety shoes
Before you install the product, take suitable precautions to protect air distribution components from contamination during installation (VDI 6022). If this is not possible, at least cover the product or take other precautions to protect it from contamination. In this case you have to ensure that the product cannot be started. Ensure that all components are clean before you install them. If necessary, clean them thoroughly. If you have to interrupt the installation procedure, protect all openings from the ingress of dust or moisture.
For installation please note:
- The installed product must be accessible for maintenance and service.
Be careful to not damage the controller accidentally:
- Handle the controller with care.
- Lift the controller only by lifting the entire casing.
- Do not lift the controller by holding the damper blade, the rotary knob or the actuator.
Fig. 7: Installing VFL
-
Set the flow rate setpoint before you install the controller, Ä ‘Setting the flow rate set-point’ on page 6
-
Insert VFL (Fig. 7/1) into the duct (Fig. 7/3).
The arrow indicates the correct airflow direction. (Fig. 7/2) . -
Push the duct sections together.
-
Use the provided stickers to indicate the position of the controllers. You can write on the stickers and affix them to the duct for people to see (Fig. 7/4)
Maintenance and cleaning
Maintenance
It is the system owner’s duty to set up a maintenance schedule, taking the
actual operating conditions (contamination, operating time etc.) of the
ventilation system into consideration.
Important: Do not lubricate the bearings of the damper blade.
Maintenance jobs to be carried out regularly:
- Visually check the controller for contamination, damage and corrosion. Remove contamination; if the controller has been damaged, or if there is any corrosion, replace the controller.
- Check the fixing of the controller and of the connected ductwork.
Cleaning
Please note
- The cleaning intervals given in the VDI 6022 standard apply.
- Clean surfaces with a damp cloth.
- Use only common household cleaners, do not use any aggressive cleaning agents.
- Do not use cleaning agents that contain chlorine.
CAV controllers VFL
References
Read User Manual Online (PDF format)
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