Cotes CRP FLEXIBLE How to use

COTES CRP/CRT INSTALLATION, OPERATING AND SERVICE HANDBOOK page 1/92
COTES CRP/CRT FLEXIBLE
How to install, set up, operate and service your
Cotes CRP/CRT Flexible dehumidifier
Cotes dehumidifier CRP/CRT
Manual number: 140729
Revision: A

COTES CRP/CRT INSTALLATION, OPERATING AND SERVICE HANDBOOK page 2/92
COTES.COM
CONTENTS
SECTION 1 / GENERAL BACKGROUND 3
ABOUT THIS HANDBOOK 3
ABOUT MANAGING HUMIDITY 5
ABOUT COTES 6
SECTION 2 / THE DEHUMIDIFIER 7
ABOUT THE COTES CRP/CRT RANGE OF DEHUMIDIFIERS 7
HOW IT WORKS 11
FEATURES AND BENEFITS 15
SECTION 3 / TECHNICAL DETAILS 17
SERIAL NUMBER/IDENTIFICATION 17
SOUND LEVEL 17
CAPACITY 18
ASSEMBLIES AND COMPONENTS 21
INCLUDED APPENDICIES AND SPECIAL NOTES 22
SECTION 4 / INSTALLATION 23
HOW TO INSTALL THIS DEHUMIDIFIER 23
HOW TO INSTALL HEAT RECOVERY UNIT 28
HOW TO COMMISSION THIS DEHUMIDIFIER 29
SECTION 5 / OPERATION 31
HOW TO OPERATE THIS DEHUMIDIFIER 31
SECTION 6 / SERVICE AND REPAIR 81
HOW TO SERVICE AND REPAIR THIS DEHUMIDIFIER 81
SECTION 7 / FORMALITIES AND GENERAL/LEGAL INFO 86
WARRANTIES 86
LEGAL NOTICES 87
EU DECLARATION OF CONFORMITY 88
HOW TO UPDATE AND IMPROVE THIS COTES DEHUMIDIFIER 90
WHO TO CONTACT 91
APPENDIX 92

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SECTION 1 / GENERAL BACKGROUND
ABOUT THIS HANDBOOK
This is the installation and service handbook for your Cotes dehumidifier.
You should read the whole handbook before installing and/or starting the dehumidifier unit for the first
time. It is important that you and your colleagues are familiar with the correct operating procedures
and all precautionary safety measures, in order to avoid any damage to the surroundings, materials
or installations, as well as to prevent any personal injury.
This handbook is mainly intended for use by technicians who install and operate this Cotes
dehumidifier unit, who carry out preventive maintenance and who replace defective parts.
Anyone using Cotes dehumidifier units, or whose responsibilities include supervising their operation,
will also benefit from reading this handbook and from consulting it as a practical help should the need
arise.
Product number for this handbook
The product number of this particular service handbook is 140729.
This is the number you need to give us if you would like to order additional copies for your staff,
colleagues or service personnel, or for technical staff from outside your company.

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SYMBOLS USED IN THIS HANDBOOK
This tells you to perform a particular action
Important to note, because items in the dehumidifier can cause injury or affect
people’s health
You need to pay special attention to this
NOTE
It is each operator’s responsibility to read and understand this manual and other information
and to employ the correct operating and maintenance procedures.

COTES CRP/CRT INSTALLATION, OPERATING AND SERVICE HANDBOOK page 5/92
ABOUT MANAGING HUMIDITY
Cotes humidity management technology –cost-effective and energy-efficient
The moisture in the air all around us has surprising –and often costly –effects on the materials,
structures and processes at the heart of virtually all business processes and industrial activity.
Cotes humidity management technologies enable you to control the levels of moisture in the air
inside any building, installation or facility, using only a bare minimum of energy.
And effective control of the basic parameters for your operations is good business.

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ABOUT COTES
World leader
Cotes is one of the world’s leading experts in the field of adsorption dehumidification, providing
technology and expertise that enable companies to achieve better control of the humidity always
present in the air.
Better management of the humidity in the air also makes it possible to improve and optimise a wide
range of industrial processes, prevent damage and corrosion in many types of structures, and reduce
energy consumption in all kinds of installations where air specifications are important.
Big benefits
Cotes dehumidification units provide exceptional advantages.
•Our know-how and experience make sure each customer gets the right equipment to tackle
all the practical needs and operating priorities associated with the specific installation
•Our units are exceptionally reliable, and can withstand even harsh treatment unusually well
•They are very easy to maintain and service
•They only use a minimum of energy in order to achieve maximum effect.
We aim to provide our customers with the most technically effective and energy-efficient solution for
the best price. This ensures the best possible return on investment, as well as peace of mind about
having made the best decision.

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SECTION 2 / THE DEHUMIDIFIER
ABOUT THE COTES CRP/CRT RANGE OF DEHUMIDIFIERS
Dehumidifiers in the CRP/CRT Flexible range are designed to remove undesirable humidity from
ambient air at normal atmospheric pressure. Typical uses can include moisture control for an
unheated store room, in a waterworks building, in a production space in which hygroscopic materials
are present.
Dehumidifiers of this kind can also be used as a part of a larger air treatment setup, in which the
dehumidifier serves as a by-pass to the main system. In such cases, the pressure in the main system
exerts an influence on the dehumidifier –and your supplier must be contacted, as this can affect the
capacity of the dehumidifier.
CRP/CRT dehumidifiers are normally placed on the floor with the rear against a wall, with due
consideration for the free space necessary to ensure easy service access.
The air to the dehumidifier must be free from solvents or other explosive components, and should be
free from pollution from solid particles, chemical substances, oil fumes and exhaust gases from diesel
engines.
The CRP and CRT ranges provide an effective choice between reducing the humidity to a much
lower level (quickly), or reducing the humidity more slowly but using less energy.
Dehumidifiers in the CRP/CRT Flexible range can be powered by different energy sources. Cotes
provides models fueled by Electricity (E), Steam (D) or Gas (G) as standard –but the use of other
energy sources or mixed-energy configurations can be designed to meet costumer request.
The last letter in the product name indicates the main source of energy used for regeneration of the
rotor material. A CRT1200E is powered by electricity, for example.

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Design priorities
The Cotes CRP/CRT Flexible range features an eye-catching modern industrial design appearance,
along with exceptional reliability.
It is designed to ensure the unhindered passage of air through the unit, which reduces
•Energy consumption
•Pressure losses
•Noise levels.
All the components, ancillary equipment and features are optimized for better performance,
exceptional service life and easy maintenance.
All components (except HR module) are mounted inside the Cotes CRP/CRT cabinet, which can be
extended to house extra components if needed.
Capacities
The Cotes CRP/CRT range currently features models with process air flows of between 2,000
m3/hour and 40,000 m3/hour. Higher air flows of up to 100,000–150,000 m3/hour are available on
request.
At process air inlet conditions of 20°C and 60% relative humidity (%RH), the capacities (the amount
of water vapour that can be removed from the air) of these CRP/CRT units are between 13 kg/hour
and >300 kg/hour. For details about a specific capacity or particular requirements, please consult
Cotes or your Cotes dealer.
Configurations
STANDARD configuration
The STANDARD configuration provides:
•High dehumidification capacity
•High energy efficiency
•Stainless steel cabinet on the outside
•Easy installation
•Low-noise running
•Low maintenance costs, reducing overall operating costs
•Easy cleaning
•Attachment of external humidity sensor (external humidity control and sensors are not
included as standard, but are available for purchase from Cotes)
•Mechanical hour counter, to keep track of how long the unit has been in operation
•Overheating alarm
•Remote start/stop option
•External fault signal and operation signal

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CAPACITY CONTROL configuration
In addition to the STANDARD configuration, the CAPACITY CONTROL configuration provides:
•Modulating capacity by a 0-10 V external signal. Can be controlled by BMS system or Cotes
controller
FLEXIBLE configuration
All dehumidifiers in the CRP/CRT Flexible range can be customised to suit a specific need –hence
the name. They are easily equipped with:
•Extra sensors –filter guard, rotor guard, temperature, dew point
•Extra filters or filters with different specifications
•Multiple heat sources
•Heating and cooling coils
•Customised control system –PLC, or signalling for BMS system
•Equipment for outdoor installation
All components are mounted inside the Cotes Flexible cabinet, which can be extended to house
extra components if needed.
Operating conditions
For the process and regeneration air inlet, the following operating conditions must be respected:
Relative humidity 0–100%
Temperature 0–35°C
Pressure Ambient ± 500 Pa
It is only possible to deviate from these ranges if such deviations were specifically mentioned when
the order was placed, and special considerations have been incorporated into the unit in order to deal
with this.
NOTE
Operating conditions for the air inlet flows must be respected.
Storage conditions
For storing the dehumidifier, the following conditions must be respected:
Relative humidity 0–90%
Temperature -20°C to 50°C

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It is only possible to deviate from these ranges if such deviations were specifically mentioned when
the order was placed, and special considerations have been incorporated into the unit in order to deal
with this.
NOTE
Storage conditions for the dehumidifier must be respected.

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HOW IT WORKS
Two flows of air
The effect of Cotes adsorption dehumidifiers basically stems from the action of two flows of air.
The drying process (1–5, black)
The incoming moisture-laden flow of air (process air) enters one side of the cabinet and gets filtered
by a process air filter. The air then passes through a slowly turning rotor whose inner surfaces are
coated with desiccant silica crystals that attract the water molecules passing through.
When the moist air passes through the rotor, water molecules are adsorbed and lodge in the pores
on the surface of the silica gel. This means the air leaves the rotor containing less moisture (humidity)
than when it entered. And because the adsorption process releases energy to the air, the
temperature increases during the process. The process air is controlled by a process air fan.
The regeneration process (1–5, blue)
The second air flow (the regeneration air) is filtered by a regeneration air filter, and heated by heating
elements to reduce its relative humidity.
On its way through the rotor, this heat evaporates the moisture previously adsorbed by the silica
crystals in the rotor. The resulting water vapour now leaves the dehumidifier in the outgoing
regeneration air. The regeneration air is controlled by a regeneration air fan.
Fans
All units in the CRP/CRT range of adsorption dehumidifiers are fitted with two fans as standard.
Cotes adsorption dehumidifiers are always configured with a certain amount of “external pressure” to
make sure that ducting does not cause a reduction in the amount of air.
For details about the fans fitted to this particular Cotes dehumidifier, see section 3.

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Filters (1)
All models of Cotes adsorption dehumidifiers are fitted with filters to remove undesirable particles or
other pollutants from the incoming process and regeneration air.
For details about the filters fitted to this particular Cotes dehumidifier, see section 3.
Heating units
Cotes CRP/CRT dehumidifiers are fitted with an electrical, steam or gas-driven heating source as
standard, to control the temperature of the regeneration air entering the unit.
For details about the heating units fitted to this particular Cotes dehumidifier, see section 3.
Heating/cooling modules
Being able to control the exact specifications of the air leaving the dehumidifier enables you to extract
maximum benefit from Cotes humidity management.
If it is important to keep the process air at a consistently high temperature, a post-heating unit can be
fitted after the adsorption rotor, as optional equipment.
A post-heating unit is normally in combination with a post-cooling coil, in order to ensure 100%
control of both relative humidity and temperature.
For details about any post-heating units fitted to this particular Cotes dehumidifier, please contact
your Cotes dealer, or Cotes.
Heat recovery unit (HR module)
Cotes adsorption dehumidifiers can be fitted with a heat exchanger to make sure that part of the
thermal energy from the regeneration air leaving the unit is extracted, and reused for preheating the
incoming regeneration air.
The heat exchanger is placed in an external box equipped with inlets and outlets for the incoming and
outgoing regeneration air. The unit is designed for positioning on top of the dehumidifier, as standard.
The heat recovery unit can save as much as 20–25% on energy consumption.

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The heat recovery unit can be fitted to any CRP/CRT dehumidifiers, but you have to install the
appropriate ducting and damper for outgoing regeneration air.
For details about the heat recovery unit fitted to this Cotes dehumidifier, please contact your Cotes
dealer, or Cotes.
Difference between CRP and CRT (between CRP6000 and CRT9000, for example)
As shown in the diagram below, CRP dehumidifiers reduce the humidity to a lower level than the
corresponding CRT units. This process means the heating source (electricity, steam or gas) has to
create a higher temperature, and a lower process air flow is required.
The CRT does not reduce the level of humidity as quickly as the CRP model, because a larger
amount of process air is warmed up to a lower temperature.
In short:
•CRP dehumidifiers: rapid reduction of humidity levels
•CRT dehumidifiers: lower energy costs

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FEATURES AND BENEFITS
Highlighted features
How customers benefit
Appearance/cabinet
Eye-catching industrial design.
Visually attractive units that can be mounted
in highly visible positions.
Outer surfaces made of stainless steel, as
standard.
Helps keep technical installations looking
modern and attractive.
Reinforces impression of quality.
Robust structure.
Longer service life.
Better return on investment.
Inner surfaces made of galvanized steel, as
standard.
Easy cleaning saves on time and manpower.
Equipment configurations inside the cabinet
All fans are mounted inside the cabinet.
Can be mounted in a wider range of positions
and structures, even where there is public
access, etc.
Easy to mount additional insulation and noise
suppression equipment.
Configurations individually customised to each
project/installation.
Key components are standardised units easily
available throughout the world.
Less downtime.
Savings on maintenance and service work.
Most effective rotor currently available
anywhere in the world.
Most humidity removed from the flow of air at
lowest cost.

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Highly durable rotor bushes.
Savings on maintenance and service work.
Greater operating efficiency.
Air flow
Available with frequency-controlled ventilator.
Savings on energy costs.
Less noise.
Access
Large door that provide rapid, easy access.
Savings on maintenance and service work.
Less downtime means greater operating
efficiency.
Filters that are easy to get out, and quick to
change.
Savings on maintenance and service work.
Greater operating efficiency.
Connectivity
Compatible with all standard electrical
voltages and frequencies
•230V/400V/440V
•50Hz/60Hz.
Savings on installation costs.
More rapid commissioning.
Modular design prepared for installation of
control systems, heaters, cooling systems,
hygrometers, sensors, etc.
Rational, cost-effective dehumidification
installations.
Maximum reliability.
Energy sources
Thermal recovery installations can be fitted.
Savings on energy costs.
Improved environmental footprint.

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SECTION 3 / TECHNICAL DETAILS
SERIAL NUMBER/IDENTIFICATION
The serial number/identification code for your particular model is located on the end of the
dehumidifier marked with A on the drawing.
SOUND LEVEL
The sound level is measured in accordance with EN292-2.
The dehumidifier is placed on the floor while the sound level is being measured. Ducts for
regeneration air and for process air/dry air are installed and led out of the measuring room.
The sound level is then measured 1 metre outside the front of the cabinet (outside the big cabinet
cover), and 1.6 metres above the floor.
See appendix 1 for sound data for this particular unit. For selecting silencers, see technical data for
fans.

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CAPACITY
The inlet conditions of the air to be dried determine how much water vapour the dehumidifier will
remove. The capacity diagram below shows how much water vapour will be removed per kg air
passing through. The nominal capacity is shown in appendix 1, however, the following procedure can
be useful when estimating the capacity at other design points.
Example, CRT:
- Inlet air conditions 20°C, 60% RH gives absolute water content Xu=7.3 g/kg
- The diagram (below) then shows dry air conditions of Xi= 2.8 g/kg
- Water vapour removed per kg air is then: (7.3 –2.8) = 4.5 g/kg
Capacity CRT3000E under these conditions:
Dry air flow (nominal) is 3000 m3/hour = (x 1.2) = 3600 kg/hour
Capacity (water vapour removed per hour) = (7200 x 4.5) = 16200 g/hour
= 389 kg/24 hours
The temperature of the dry air is higher than for the inlet air. This stems from the evaporation heat
release and the heat gain from the rotor. The temperature is shown to be 35°C.

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