Refrigerant dryers

FD (VSD)+ series (1250-4000 l/s, 2648-4238 cfm)

 Complete protection for
your application
Compressed air entering the air net is always saturated. When it cools, the
moisture will condense, causing damage to your air system and finished
products. By removing moisture from compressed air with a pressure
dewpoint (PDP) as low as +3°C / +37°F, our FD (VSD)+ refrigerant dryers
significantly reduce system failures, production downtime and costly repairs.

The FD (VSD)+ range has been designed in order to be fully integrated into an
Atlas Copco smart AIR solution.

FD+
Superior performance
FD (VSD)+ refrigerant dryers are designed in-house, tested
using the most stringent methods and manufactured on a
highly advanced, lean production line. They meet or
exceed the international standards for compressed air
purity and are tested according to ISO 7183:2007.

Maximum energy efficiency

In the case of refrigerant dryers, the energy efficiency is
defined by the internal pressure drop (that is the
difference between the pressure of the compressed air at
the dryer inlet and outlet) and the electrical power
consumed by the dryer. The key for designing refrigerant
dryers is therefore to keep the pressure drop as low as
possible, and to develop technologies that allow the
removal of moisture from the compressed air in the most
efficient way

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Energy efficiency
A unique combination of high-efficiency components, smart unit design and an advanced control system enables you to achieve
average energy savings of 50%. With an FD (VSD)+ refrigerant dryer you can maximize your energy savings from the first minute of
operation.

VSD: driving down your energy cost

Over 35% of the dryer’s lifecycle cost is taken up by
the energy it consumes. To cut your energy costs,
we offer FD (VSD)+ dryers with Variable Speed Drive
(VSD) technology. VSD leads to major energy
savings, reducing the consumption of energy
producing fuels and protecting the environment
for future generations.

In almost every production environment,

compressed air flow fluctuates depending on
different factors (time of the day, week or even
months). In addition to fluctuation of compressed
air flow, operational temperatures such as ambient
and compressed air temperatures may vary. VSD
technology allows the FD VSD+ dryers not only to
save energy at full load, but also to save a
significant amount of energy at partial load or
under lighter working conditions.

Legend
3 = Fixed speed dryers
2 = Energy savings with VSD dryers
1 = VSD dryers

FD+
Low pressure drop
The lower the internal pressure drop of the dryer,
the lower the pressure that you need to achieve
with the air compressor, and the less energy the air
compressor consumes. We have therefore put
considerable efforts into minimizing pressure drop
of the FD (VSD)+ dryer.

Our FD (VSD)+ dryers are designed to have a very

low internal pressure drop below 0.2 bar / 2.9 psi,
and the lowest power consumption.

Components designed for efficiency

The heat exchanger has been designed to reduce
the pressure drop and increases the performance
of the dryer.

The R410a refrigerant makes the FD+ dryers

impressively efficient in terms of power
consumption.

Electronic no loss drains account for zero waste of

compressed air during the draining process.

Our state-of-the art controller uses a saver cycle

control. Increasing energy efficiency due to smart
regulation based on the dryer load. It also uses a
flow switch. This means when there is no
compressed air demand, no energy will be
consumed.

By using a scroll refrigerant compressor this unit

consumes an average of 30% less power than
reciprocating technology refrigerant compressor.

The electronic hot gas bypas valves are controlled

by the Elektronikon® unit for the most efficient unit
regulation.

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 Low total cost of ownership
A unique combination of high-efficiency
components, smart unit design and an advanced
control system enables you to achieve average
energy savings of 50%. With an FD (VSD)+
refrigerant dryer you can maximize your energy
savings from the first minute of operation.

A step ahead in monitoring and

controls
A step ahead in monitoring and controls

It is not only components using cutting edge

technology that define the ultimate energy
efficiency of the FD (VSD)+ dryers, it is also how
these components are sized and regulated during
operation.

FD (VSD)+ dryers are equipped with the

Elektronikon® Mk5 touch unit controller. As this is
the same unit controller used for our air
compressors, it allows an FD (VSD)+ dryer to
communicate with an air compressor and avoid
energy losses.

The Elektronikon® unit controller is specially

designed to maximize the performance of your FD
(VSD)+ refrigerant dryer under a variety of
conditions. It provides you with increased energy
efficiency, lower energy consumption and reduced
maintenance times. In addition, you – and your
entire air system – experience less stress!

FD+
Reliability

Heat exchanger Elektronikon

Minimum pressure drop and maximum heat transfer The Elektronikon® unit controller is specially designed to
efficiency design. maximize the performance of your FD (VSD)+ refrigerant
Removal of nearly 100% condensate by mechanical dryer under a variety of conditions. It provides you with
separator increased energy efficiency, lower energy consumption
No consumables and reduced maintenance times.

7
 Variable Speed Drive technology Refrigerant control valves
Atlas Copco's FD VSD+ dryers are designed to provide the Traditionally refrigerant dryers are equipped with a
most efficient refrigeration cycle. The functionality of the mechanical expansion valve and an ON/OFF solenoid
FD VSD+ dryers allows to efficiently communicate with the valve in the hot gas bypass line. FD (VSD)+ dryers are
Atlas Copco air compressor and to take proactive action. equipped with new electronic valves. Electronic valves
This means it can shut down and start up when necessary, lead to a whole new level of reliability and efficiency. The
resulting in reduction of the energy consumption. electronic valves use proportional valve control, which will
increase the valve's life time and increase dew point
The refrigerant compressor motor and variable speed stability.
drive are sourced from the same sub-supplier and
recommended to work together.

Electronic cooling water regulation valve

Refrigerant compressor The electronic cooling water regulation valves ensure an
optimum condensing temperature by regulating and
A high-efficiency scroll refrigerant compressor consumes controlling the flow of the cooling water. This allows for a
on average 30% less power than dryers operating with a stable dew point and optimum operation efficiency.
reciprocating refrigerant compressor.
The FD (VSD)+ refrigerant compressor is accurately sized
for best performance with the lowest energy consumption
possible. Electronic drains
• Simplified connection of the drain to the heat
Highly efficient R410a refrigerant. Zero ozone depletion
exchanger(s)
and low CO2 equivalent.
• The control algorithm is specifically designed to avoid
clogging of the drain and to increase reliability.

Condenser
Oversized robust design with easy to clean shell & tube Robust base frame
design. The condenser ensures a reliable long lifetime and
The robust base frame design adds to the reliability of the
with optimal performance.
unit. The FD+ also comes with forklift slots that allows for
easy relocation when needed.

FD+
Installation
Smart AIR Solutions, are a complete air or gas solution designed to provide our customers with the lowest life cycle costs for their
equipment.

1. Compressors
Often people buy the same size compressor, but to
optimize the system it’s better to make a combination of
different size compressors, technologies and controls.

9
 3. Refrigerant dryers
Refrigerant dryers will dry the air until 3°C PDP.

4. Air treatment portfolio

Atlas Copco has a wide air treatment portfolio that
matches your needs. Our portfolio ranges from removing
water, oil and dust from your compressed air to
generating Oxygen and Nitrogen on site.

2. Central controller
Having a central controller reduces the average pressure
band.
It also reduces the operating pressure of your machines.
• By reducing the pressure by 1 bar (or 14.5 psi), your
energy usage lowers by 7%.
• By reducing the pressure by 1 bar (or 14.5 psi) decreases
air leakages by 13%.
Multiple embedded functions in the Optimizer 4.0 in
which pressure, capacity and speed can be regulated.

Legend
A = Net pressure
B = Average pressure
C = Min. system pressure

smart AIR solutions

A compressor is only one component in the bigger
picture of a smart AIR solution. Only a complete
compressed air system is an energy-efficient
solution. We designed a range of class-leading
compressed air products, fully optimized to work
better together. A smart AIR solution is the most
efficient and reliable combination of a compressor
with our air and gas equipment. This solution can
include dryers, filters, controllers, energy recovery
systems, nitrogen or oxygen generators, air
receivers, coolers or boosters specified to your
needs.

FD+
Flowchart
Working principle Air cooled version FD+ series

1. Air-to-air part of the heat exchanger 3. Integrated water separator

Incoming compressed air is cooled down by the outgoing The moisture is collected and evacuated by the electronic
dry cold compressed air. zero loss drain.

2. Air-to-refrigerant part of the heat 4. Refrigerant compressor

exchanger: The refrigerant compressor compresses the gaseous
The compressed air is cooled to the required dewpoint by refrigerant to a higher pressure.
the refrigerant. The water vapor condenses into water
droplets.

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 5. Electronic hot gas bypass valve 8. Refrigerant filter
The electronic hot gas bypass valve prevents the heat The refrigerant filter protects the entire system from water
exchanger from freezing at lower load conditions. and solid particles.

6. Refrigerant condenser 9. Electronic thermostatic expansion

The refrigerant condenser cools the refrigerant so that it
valve
changes from a gas to a liquid. The electronic thermostatic expansion valve further
reduces the pressure which cools the refrigerant.

7. EC fans (air cooled versions):

The EC fans (air cooled versions) generate required flow of
10. Liquid separator
the cooling air. The liquid separator ensures that only gaseous refrigerant
enters the compressor.

FD+
Options
Optimize your system

Scope of supply

Air
Inlet and outlet DIN/ANSI flanges
treatment
Heat exchanger with integrated water separator
Flow switch
Zero loss condensate drains
Refrigerant
Scroll compressor (R410a refrigerant)
circuit
Electronic hot gas bypass valve
Electronic thermostatic expansion valve
Air/water cooled condenser
EC fans (air cooled units)
Electronic water regulation valve (water cooled units)
Refrigerant filter
Refrigerant liquid separator
Unit
Variable Speed Drive
control
Elektronikon® control and monitoring system
Integrated control panel
IP54 protection
Voltage-free contacts for remote alarm and warning signals
Framework Base frame with forklift slots
Independent unit canopy
Our user-friendly data monitoring system gives you remote insight into your compressed air installation. It helps to predict possible developing
SMARTLINK
problems and even shows you the potential for optimization and energy saving.

Additional features and options

46°C / 115°F
ambient
Special version with more cooling power, allowing for operation at high ambient temperature without de-rating the dryers capacity.
temperature
version
Cooling air pre- Plastic mesh pre-filter protects the unit from pollution that could reduce the dryer’s energy efficiency and interrupt its operation. Add-on
filter design of the pre-filter allows it to perform maintenance (cleaning) while the dryer remains in operation.
Reduce installation cost, save space and improve energy efficiency of the overall compressed air installation with our low pressure drop
Compressed air
filters. Filters are sized for the operation with 100% compressed air flow of the refrigerant dryer and can be connected to the unit controller to
inlet filtration
monitor the pressure drop status.
Anchor pads Easy solution in case you need to bolt the unit to the surface it is installed on.

13
Options
Optimize your system

Additional features and options

Customized Protection against aggressive environments, sea water cooling circuit, adaptation for outdoor operation, approvals for marine applications… These
solutions are just some of the ways we can make the FD (VSD)+ refrigerant dryer suit your installation requirement in the most efficient way.

FD+
Technical specifications
Data from the FD+ series.

FD 1250-2000+ (50 Hz)

Inlet flow In/outlet connections filter size R410a amount CO2 equivalent
TYPE Design ambient temp.
l/s m³/h cfm DIN PN16/ANSI 150# PD+ / UD+ kg ton
Aircooled
FD 1250+ 40°C (104°F) 1250 4500 2648.6 1400+F 11 22.968
FD 1250+ 46°C (115°F) 1250 4500 2648.6 1400+F 9.5 19.863
FD 1500+ 40°C (104°F) 1500 5400 3178.32 1800+F 10 20.88
FD 1500+ 46°C (115°F) 1500 5400 3178.32 1800+F 12.5 26.1
DN150/6 inch
FD 1750+ 40°C (104°F) 1750 6300 3708.04 1800+F 10.5 21.924
FD1750+ 46°C (115°F) 1750 6300 3708.04 1800+F 13 27.144
FD 2000+ 40°C (104°F) 2000 7200 4237.76 2200+F 12 25.056
FD 2000+ 46°C (115°F) 2000 7200 4237.76 2200+F 14 29.232
Water cooled
FD 1250+ 40°C (104°F) 1250 4500 2648.6 1400+F 12 25.056
FD 1250+ 46°C (115°F) 1250 4500 2648.6 1400+F 12 25.056
FD 1500+ 40°C (104°F) 1500 5400 3178.32 1800+F 11.5 24.012
FD 1500+ 46°C (115°F) 1500 5400 3178.32 1800+F 11.5 24.012
DN150/6 inch
FD 1750+ 40°C (104°F) 1750 6300 3708.04 1800+F 13 27.144
FD 1750+ 46°C (115°F) 1750 6300 3708.04 1800+F 13 27.144
FD 2000+ 40°C (104°F) 2000 7200 4237.76 2200+F 13 27.144
FD 2000+ 46°C (115°F) 2000 7200 4237.76 2200+F 13 27.144

FD 1250-2000+ (60 Hz)

Rated capacity In/outlet connections filter size R410a amount CO2 equivalent
Type Design ambient temp.
l/s m³/h cfm DIN PN16/ANSI 150# PD+ / UD+ kg ton
Aircooled
FD 1250+ 40°C (104°F) 1250 4500 2648.6 1400+F 11 22.968
FD 1250+ 46°C (115°F) 1250 4500 2648.6 1400+F 10.5 21.924
FD 1500+ 40°C (104°F) 1500 5400 3178.32 1800+F 11.4 23.8032
FD 1500+ 46°C (115°F) 1500 5400 3178.32 1800+F 12.5 26.1
DN150/6 inch
FD 1750+ 40°C (104°F) 1750 6300 3708.04 1800+F 10.5 21.924
FD 1750+ 46°C (115°F) 1750 6300 3708.04 1800+F 13 27.144
FD 2000+ 40°C (104°F) 2000 7200 4237.76 2200+F 10.5 21.924
FD 2000+ 46°C (115°F) 2000 7200 4237.76 2200+F 13 27.144
Water cooled
FD 1250+ 40°C (104°F) 1250 4500 2648.6 DN150/6 inch 1400+F 11 22.968

15
Technical specifications
Data from the FD+ series.

FD 1250-2000+ (60 Hz)

Rated capacity In/outlet connections filter size R410a amount CO2 equivalent
Type Design ambient temp.
l/s m³/h cfm DIN PN16/ANSI 150# PD+ / UD+ kg ton
FD 1250+ 46°C (115°F) 1250 4500 2648.6 1400+F 11 22.968
FD 1500+ 40°C (104°F) 1500 5400 3178.32 1800+F 12 25.056
FD 1500+ 46°C (115°F) 1500 5400 3178.32 1800+F 12 25.056
FD 1750+ 40°C (104°F) 1750 6300 3708.04 DN150/6 inch 1800+F 13.5 28.188
FD 1750+ 46°C (115°F) 1750 6300 3708.04 1800+F 13.5 28.188
FD 2000+ 40°C (104°F) 2000 7200 4237.76 2200+F 13 27.144
FD 2000+ 46°C (115°F) 2000 7200 4237.76 2200+F 13 27.144

FD 1250-4000 VSD+

Inlet flow In/outlet connections Filter size R410a amount CO2 equivalent
TYPE Design ambient temp.
l/s m³/h cfm DIN PN16/ANSI 150# PD+ / UD+ kg ton
Aircooled
FD 1250 VSD+ 40°C (104°F) 1250 4500 2648.6 1400+F 9.5 19.836
FD 1250 VSD+ 46°C (115°F) 1250 4500 2648.6 1400+F 9.5 19.836
FD 1500 VSD+ 40°C (104°F) 1500 5400 3178.32 1800+F 10 20.88
FD 1500 VSD+ 46°C (115°F) 1500 5400 3178.32 1800+F 13 27.144
FD 1750 VSD+ 40°C (104°F) 1750 6300 3708.04 DN150/6 inch 1800+F 10.5 21.924
FD 1750 VSD+ 46°C (115°F) 1750 6300 3708.04 1800+F 13.5 28.188
FD 2000 VSD+ 40°C (104°F) 2000 7200 4237.76 2200+F 10.5 21.924
FD 2000 VSD+ 46°C (115°F) 2000 7200 4237.76 2200+F 13.5 28.188
FD 2400 VSD+ 40°C (104°F) 2000 7200 4237.76 2200+F 13 27.144
FD 3000 VSD+ 40°C (104°F) 3000 10800 6356.64 3000+F 19.5 40.716
DN200/8 inch
FD 4000 VSD+ 40°C (104°F) 4000 14400 8475.52 4000+F 21 43.848
Watercooled
FD 1250 VSD+ 46°C (115°F) 1250 4500 2648.6 1400+F 12 25.056
FD 1500 VSD+ 46°C (115°F) 1500 5400 3178.32 1800+F 13 27.144
FD 1750 VSD+ 46°C (115°F) 1750 6300 3708.04 DN150/6 inch 1800+F 12.5 26.1
FD 2000 VSD+ 46°C (115°F) 2000 7200 4237.76 2200+F 13 27.144
FD 2400 VSD+ 46°C (115°F) 2000 7200 4237.76 2200+F 13 27.144
FD 3000 VSD+ 46°C (115°F) 3000 10800 6356.64 3000+F 16.5 34.452
DN200/8 inch
FD 4000 VSD+ 46°C (115°F) 4000 14400 8475.52 4000+F 21 43.848

FD+
Technical specifications
Data from the FD+ series.

Dimensions

Dimensions in mm dimensions in inch

TYPE
L W H L W H
Air cooled (50/60Hz)
FD 1250-2000+ 1474 1579 2295 58.0 90.4 67.9
Water cooled (50/60 Hz)
FD 1250-2000+ 1474 1579 1725 58.0 62.2 67.9
VSD - Air cooled
FD 1250-2400 VSD+ 1474 1579 2295 58.0 62.2 90.4
FD 3000-4000 VSD+ 2502 1581 2295 98.5 62.2 90.4
VSD - Water cooled
FD 1250-2400 VSD+ 1474 1579 1725 58.0 62.2 67.9
FD 3000-4000 VSD+ 2502 1581 1736 98.5 62.2 68.3

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 Notes

FD+
19
 Atlas Copco AB

Reg. no: 556014-2720

www.atlascopco.com
Phone: +46 8 743 80 00
(publ) SE-105 23 Stockholm, Sweden

20
2935 0754 00 © 2020, Atlas Copco Airpower NV, Belgium. All rights reserved. Designs and specifications are subject to change without notice or obligation. Read all safety instructions in the manual before
usage.