Trox VFC series User Manual

2
Operating manual
TROX air terminal units
Type VFC volume ow controllers
VFC
Area of application
TROX VFC series volume ow controllers are mechanical
system-powered controllers for controlling the airow in
constant and variable air volume systems.
3 variants of the volume ow controllers are available:
• Constant volume ow rate
• 
min
- 
max
switching
Actuator with potentiometers (type E01, E02)
Actuator with mechanical stops (type M01, M02)
• Variable volume ow rate,
Actuator with potentiometers (type E03)
The set ow rate must always be set by the customer on site.
The setting is made without adjustment devices.
Each volume ow controller has a sticker with a characteristic
for determining the volume ow rate. One or two settings
are read o and transferred to the rotary knob or actuator
(potentiometer or mechanical stops).
Operating modes
• Constant volume ow rate
The volume ow controller keeps the set ow rate constant
independently of the duct pressure.
• Variable volume ow rate
The volume ow controller keeps a variable set ow rate
constant independently of the duct pressure. For this
purpose, the volume ow controller receives a control
variable from a room temperature controller or air quality
controller, a set point adjuster or a DDC outstation. The
control variable is a 0 to 10 V DC voltage signal.
• 
min
- 
max
switching
The volume ow controller works with two setpoint values
that are switched over using switches or relays provided by
the customer.
General information
Correct use
The volume ow controllers are suitable for use in ventilation
and air conditioning systems. Particular conditions can
restrict the functioning capacity and must be taken into
account during the design stage:
• Use of VFC series volume ow controller in aircraft is not
permitted.
• In systems with aggressive air, only air terminal units made
of plastic should be used, subject to extensive tests for
suitability.
• Galvanised sheet steel units must not be installed in
contaminated environments (e.g. acetic acid).
• The controller and actuator do not contain any parts that
can be exchanged or repaired by the user.
• The actuator contains electronic components therefore
must be separated from domestic waste. When disposed
of, local up to date regulations must be complied with.
• The mechanical components of VFC series volume ow
controllers are maintenance-free.
• Sticky constituents of the air, in particular in association
with u, can lead to impairment or failure of the regulation
function.
Safety notes
Danger!
Danger of electric shock! Do not touch any live
components! Electrical equipment carries a
dangerous electrical voltage.
• Only skilled qualified electricians are allowed to
work on the electrical system.
• Switch off the power supply before working on
any electrical equipment.
• Safety transformers must be used.
• Installation should only be carried out by specialists.
The normal rules of site working, in particular the health
and safety regulations must be complied with.
• For installation, wiring, and commissioning observe
the recognised technical regulations, especially safety
and accident prevention regulations.
• Due to the danger of injury on edges and burrs, transport
and installation may only be performed while wearing
gloves.
• Install the units prociently with suspension points
and secure with locknuts. Only load the suspension points
with the units' own weight. Adjacent components and
connecting ducts must be supported separately.
• Only use units with ATEX approval for rooms containing
a potentially explosive atmosphere.

Trox VFC series Specifications

General

Brand	Trox
Model	VFC series
Category	Controller
Language	English