Cotes C35 Service manual

COTES C35 OPERATING AND SERVICE HANDBOOK page 1/71
COTES ALL ROUND
C35
How to install, set up, operate and service your
Cotes dehumidifier
Cotes dehumidifier C35E/C35D/C35C
Manual number: 140712
Revision: O.2

COTES C35 OPERATING AND SERVICE HANDBOOK page 2/71
COTES.COM

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CONTENTS
SECTION 1 / GENERAL BACKGROUND 5
ABOUT THIS HANDBOOK 5
ABOUT COTES 7
SECTION 2 / THE DEHUMIDIFIER 8
ABOUT THE COTES C35 RANGE OF DEHUMIDIFIERS 8
HOW IT WORKS 12
FEATURES AND BENEFITS 16
SECTION 3 / TECHNICAL DETAILS 18
SERIAL NUMBER/IDENTIFICATION 18
SPECIFICATIONS 19
ASSEMBLIES AND COMPONENTS 26
SOUND LEVELS 30
SECTION 4 / INSTALLATION 31
HOW TO INSTALL A C35 DEHUMIDIFIER 31
ADDITIONAL INFORMATION FOR A C35C DEHUMIDIFIER (COLD STORE MODEL) 35
HOW TO COMMISSION THIS DEHUMIDIFIER 37
SECTION 5 / OPERATION 40
HOW TO OPERATE WITH BASIC-PLR BASED DEHUMIDIFIER 40
HOW TO OPERATE WITH PLC BASED DEHUMIDIFIER 44
SECTION 6 / SERVICE AND REPAIR 48
HOW TO SERVICE AND REPAIR THIS DEHUMIDIFIER 48
SECTION 7 / CONDENSATION OR HEAT RECOVERY UNIT 58
RECOMMENDED COMBINATIONS OF DEHUMIDIFIERS AND MODULES 58
SPECIFICATIONS, ASSEMBLIES AND COMPONENTS 59
HOW TO INSTALL A CONDENSATION UNIT OR HEAT RECOVERY UNIT 62
HOW TO ADJUST THE AIR FLOW WITH THE HR MODULE 65
SECTION 8 / FORMALITIES AND GENERAL/LEGAL INFO 67
WARRANTIES 67
LEGAL NOTICES 68

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EU DECLARATION OF CONFORMITY 69
HOW TO UPDATE AND IMPROVE THIS COTES DEHUMIDIFIER 70
WHOM TO CONTACT 71
ELECTRICAL DIAGRAMS APPENDIX

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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 140712.
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.

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ABOUT COTES
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.
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 C35 RANGE OF DEHUMIDIFIERS
The Cotes C35 range of dehumidifiers is designed and configured for a wide range of industrial uses.
Prominent among these is humidity management in storage facilities and basement areas, in water
works and in many kinds of process industry in which stable, well-controlled air conditions are crucial.
C35E units are specifically configured to minimise the overall energy consumption of the
dehumidification process, whereas C35D units are configured to make sure the air flow is as dry as
possible. C35C units are specially designed to operate inside cold storage facilities.
The dehumidifiers in the C35 range are designed for easy cleaning, with configuration options that
include cooling/heating coils and/or a heat recovery module and a condensation module and
additional filters, if needed.
Design priorities
The Cotes C35 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 optimised for better performance,
exceptional service life and ease of maintenance.
Capacities
The Cotes C35 range currently features models with air volumes of between 405 m3/hour and 1,000
m3/hour.
At process air inlet conditions of 20°C and 60% relative humidity (%RH), the capacities (the amount
of water which can be removed from the air) of these units are between 3.3 kg/hour and 5.6 kg/hour.
At process air inlet conditions from -25°C to -18°C and 95% relative humidity (%RH), the capacities
(the amount of water which can be removed from the air) of these units are between 0.3 kg/hour and
0.9 kg/hour.

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Configuration priorities
The Cotes C35 range is available with four different control configurations –Configuration-A,
Configuration-B, Configuration-C and Configuration-D.
Control configuration-A is stripped down to a minimum of features and is therefore not equipped with
a PLC screen interface.
Configuration-A/ BASIC PLR
The Configuration-A provides:
•High dehumidification capacity
•High energy efficiency
•Stainless steel cabinet
•Easy installation
•Low-noise running
•Low maintenance costs, reducing the overall operating cost
•Easy cleaning
•Hour counter, to keep track of how long the unit has been in operation
•Attachment of external humidity sensor (external humidify control and sensors are not
included as standard, but are available for purchase from Cotes)
•Over-heating alarm
•Remote start/stop option
•External fault signal and operation signal
Configuration-B
In addition to the Configuration-A features, the Configuration-B provides:
•Attachment of one external humidity sensor
•3.5-inch touch display
•Service indication, to keep track of any need for maintenance
•Hour counter, to keep track of how long the unit and components has been in operation
•Mechanical service alarm for rotor and filters
•Control of regeneration air fan, making installation easier
•Capacity control / modulating heat control
•Measuring and controlling dew point temperature
•Datalogging for keeping track of conditions in the space where the unit is installed
•Timer program
•Network connectivity (optional)
•Monitoring and control via smartphone app (optional)
•Monitoring and control by Cotes service centre (optional)

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Configuration-C
In addition to the Configuration-B features, the Configuration-C provides:
•Control of process air fan, making installation easier
•Monitoring and control of air flows [m3/hour]
•Energy-saving program, for situations where energy consumption is the prime consideration
•Low-noise program, for situations where silence is the prime consideration
•CUSTOM program, for situation where dehumidifier parameters needs to be controlled
Configuration-D
In addition to the Configuration-C features, the Configuration-D provides:
•Accurate control of humidity level, whether % relative humidity or specific humidity [g/kg]
•Continuous measurement of capacity
•Detailed energy-saving program, for situations where energy consumption is the prime
consideration
Intended use of dehumidifier
The dehumidifier is designed for dehumidifying/conditioning atmospheric air only –filtered with at
least a G4 filter. Unless specifically stated in the manual or in a separate agreement with Cotes or a
Cotes dealer, this dehumidifier must not be used for the following purposes:
•Conditioning gases other than atmospheric air at ambient pressure
•Conditioning air contaminated with any chemical or other aggressive/corrosive elements
including salt (sodium chloride)
•Conditioning explosive or flammable air –including using the dehumidifier in ATEX-
classified zones.
The unit is intended for use in residential, commercial and industrial environments.
Operating conditions –standard models (E and D)
For the process and regeneration air inlet, the following operating conditions must be respected:
Relative humidity 0–100%
Temperature 0–40°C
Pressure Ambient ± 100 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.
Depending on configuration the actual sensor range may be limited to 5-100 %.

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Operating conditions –Cold store models (C)
For the process and regeneration air inlet, the following operating conditions must be respected:
Relative humidity 0–100%
Temperature process -25 - 0°C (can be used up to 40 C)
Temperature regeneration -25 - 40°C
Pressure Ambient ± 100 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
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 (A to E)
The incoming moisture-laden flow of air (process air) (A) enters one side of the cabinet and gets
filtered by a process air filter (B). The air then passes through a slowly turning rotor (C) 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 (E). 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 (D).
The regeneration process (F to J)
The second air flow (the regeneration air) (J) is filtered by a regeneration air filter (K), and heated by
heating elements (I) to reduce its relative humidity. On its way through the rotor (H), 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 (F). The regeneration air is
controlled by a regeneration air fan (G).

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Fans
All units in the C35 range of adsorption dehumidifiers are fitted with two fans as standard.
For the Configuration-B, the speed of the regeneration air fan can be controlled.
For the Configuration-C and Configuration-D, the flows of process air and regeneration air can be
controlled manually or automatically (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 page 28.
Filters
All models of Cotes adsorption dehumidifiers are fitted with filters to remove undesirable particles or
other pollutants from the incoming process and regeneration air.
Filters of the G4 class are fitted to Cotes C35 units as standard in order to filter the incoming process
air.
The regeneration air filter is a high-temperature resistance filter, as an additional safety precaution
should power loss occur during operation.
For details about the filters fitted to this particular Cotes dehumidifier, see page 28.
Heating units
Cotes C35 dehumidifiers are fitted with electrical heating units as standard, in order to control the
temperature of the regeneration air entering the unit.
For details about heating units fitted to this particular Cotes dehumidifier, see page 28.
Post-heating units
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.
Post-heating units can be retrofitted to C35E/C35D dehumidifiers with the Configuration-B,
Configuration-C and Configuration-D.
For details about any post-heating units fitted to this particular Cotes dehumidifier, please contact
your Cotes dealer, or Cotes.

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Pre-cooling units
Being able to control the exact specifications of the air entering the dehumidifier enables you to
extract maximum benefit from Cotes humidity management.
Cotes C35E/C35D dehumidifiers can therefore be fitted with cooling units to reduce and/or control the
temperature of the dry air entering and leaving the dehumidifier.
A cooling unit fitted before the adsorption rotor is particularly beneficial if the incoming process air is
very warm and humid. In such cases, some of the water in the air condenses and the efficiency of the
adsorption rotor increases. A cooling unit fitted before the adsorption rotor can also be an advantage
if the outgoing process air has to be especially dry.
Pre-cooling units can be retrofitted to C35E/C35D dehumidifiers with the Configuration-B,
Configuration-C and Configuration-D.
For details about any pre-cooling units fitted to this particular Cotes dehumidifier, please contact your
Cotes dealer, or Cotes.
Post-cooling unit
Cotes C35E/C35D units can be fitted with post-cooling/heating units to maintain full control of the
temperature of the dry air leaving the dehumidifier.
Post-cooling/heating units can be retrofitted to C35E/C35D dehumidifiers with the Configuration-B,
Configuration-C and Configuration-D.
For details about any cooling 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 heat recovery unit can save as much as 20–25% on energy consumption, but you have to install
the appropriate ducting and damper for outgoing regeneration air.
For details about the heat recovery unit fitted to this particular Cotes dehumidifier, please contact
your Cotes dealer, or Cotes.

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Water condensation unit (LK module)
Cotes adsorption dehumidifiers can be fitted with water condensation units in order to condense
some of the water from the regeneration air leaving the dehumidifier. This is beneficial when a
regeneration air outlet is not a good idea or cannot be fitted.
When a water condensation unit is installed, the regeneration air forms a closed circuit, using
ambient air passing through heat exchangers to cool the regeneration air to below condensation
temperature.
For details about the water condensation unit fitted to this particular Cotes dehumidifier, please
contact your Cotes dealer, or Cotes.

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FEATURES AND BENEFITS
Highlighted features
How customers benefit
Appearance/cabinet
Eye-catching industrial design appearance.
Visually attractive units that can be mounted
in highly visible positions.
Inner surfaces made of stainless steel.
Easy cleaning saves on time and manpower.
Helps keep hygiene standards high and visual
appearance good.
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.
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
* 50Hz/60Hz.
Savings on installation costs.
More rapid commissioning.
Designed for compatibility with modern PLC
and web-based control and warning systems.
Easy to control and monitor from virtually
anywhere.
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
This is the installation and service handbook for your Cotes dehumidifier.
The serial number/identification code for your particular model is located in the top of the dehumidifier
(see drawing below).
V HZ SUPPLY
KG
ITEM NO.
TYPE
NO
KW HEAT KW TOTAL
Cotes A/S
Ndr. Ringgade 70C
DK 4000 Slagelse
35133E-20
C35E-3.3 3x400V/50Hz PLC-B
YY.XXXXXX
102.0
400
50
3PH+N+PE
4.6
5.1
Serial number:
Example:
18.12345
12345 = Serial number
18 = Year of production

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SPECIFICATIONS
Please note that specifications and controls given in this handbook are in some situations
approximate.
Table 1 Technical data C35E/C35D/C35C
Type
C35E
C35D
C35C
Model
3.3
3.8
4.5
5.1
5.6
3.2
4.5
0.5
0.9
Dry air,
nominal**
m3/ho
ur
750
1000
1000
1000
1000
405
617
750
1000
Regenerati
on air,
nominal*
m3
/hour
135
135
168
202
233
135
202
96
129
External
pressure,
dry air (at
nominal air
flow)
Pa
210
210
210
210
210
210
210
210
210
External
pressure,
regeneratio
n air (at
nominal air
flow)
Pa
300
300
300
300
250
300
300
300
300
Capacity at
20ºC, 60%
relative
humidity
kg
/hour
3.3
3.8
4.5
5.1
5.6
3.2
4.5
-
Capacity at
-25ºC
/ -18ºC,
95%
relative
humidity
kg
/hour
-
0.3
/
0.5
0.4
/
0.9

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Electric
heater,
max.
kW
4.6
4.6
5.7
6.9
8.0
4.6
6.9
2.3
3.4
External
duct
heater,
max.
kW
-
1.0
Maximum
fuse
(3x230V)
A
10
(32)
10
(32)
16
(32)
16
(32)
16
(32)
10
(32)
16
(32)
Minimum
fuse
(3x230V)
A
10
(20)
10
(20)
16
(25)
16
(25)
16
(32)
10
(20)
16
(32)
10
(32)
16
(32)
Nominal
power
consumptio
n
kW
4.92
5.10
6.25
7.42
8.50
4.86
7.26
3.9
5.3
Maximum
connected
load
kW
5.10
5.40
6.50
7.70
8.80
5.10
7.70
3.9
5.3
Voltage
(3x230V)
V
400
(3x230)
Frequency
Hz
50
Ground
(3x230V)
3PH+N+PE
(3PH+PE)
Sound
level with
duct (ISO
11201)
dB(A)
53
59
59
59
59
53
53
53
59
* Adjustable in Configuration-B and fully controlled in Configuration-C and Configuration-D.
Also adjustable in Configuration-A with Reg Air Fan Kit installed.
** Fully controlled in Configuration-C and Configuration-D.