Coaire CNCM10 Installation Operation & Maintenance - User Manual

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Non-Cycling

Refrigerate

Air Dryers

Installation & Operation

Maintenance

Manual

Models

CNCM10 CNCM18

CNCMIOM 01-02 Rev. REL

Model

Number:

Serial

Number:

FILL

COMPLETELY

INSTALLATION

Coaire Technologies Corporation

12226 Coast Drive, Whittier, CA 90601

◊

TEL.(562)463-3935

◊

(562)463-4928

website: www.coaire.com

■

e-mail: sales@coaire.com/support@coaire.com

Printed in U.S.A. FORM CM-AD03

FEB. 2002

STATEMENT OF WARRANTY TERMS & CONDITIONS

COAIRE’s refrigerated air dryers are warranted to be free of defects in materials and workmanship under proper use,
installation, and application. This warranty shall be for a period of 15 months from date of shipment from our factory
or other stocking facilities or 12 months from date of installation. Proof of installation date will be required. All dryers
outside the U.S. and Canada carry a parts only warranty.

ALL FREIGHT DAMAGE CLAIMS ARE NOT THE RESPONSIBILITY OF THE MANUFACTURER AND ARE NOT
COVERED UNDER WARRANTY AS ALL PRODUCTS ARE SHIPPED F.O.B. SHIPPER.

PLEASE DIRECT ALL FREIGHT CLAIMS TO THE SHIPPER IN QUESTION.

MAINTENANCE AND ADJUSTMENTS

ADJUSTMENTS TO THE HOT GAS AND MAINTENANCE OF FLOAT AND AUTOMATIC DRAINS AND
CONDENSER COILS ARE CONSIDERED TO BE ROUTINE MAINTENANCE AND THEREFORE NON-
WARRANTABLE ITEMS AND ARE THE SOLE RESPONSIBILITY OF THE END USER. CONSULT THE
INSTALLATION, OPERATION AND MAINTENANCE MANUAL FOR THE ADJUSTMENT AND MAINTENANCE
PROCEDURES.

This warranty does not apply to any unit damaged by accident, modification, misuse, negligence, or misapplication.
Damage to heat exchangers by exposure to ammonia, any other corrosive substance or sub-freezing environment
will be considered misuse.

Any refrigerated dryer part or material found defective will be repaired, replaced or refunded, at the sellers option free
of charge, provided that COAIRE is notified within the above stated warranty period.

All returns of allegedly

defective equipment must have prior written authorization.

Said authorization may be obtained through our

refrigerated dryer service department. All refrigerated dryers, parts, materials must be returned

freight prepaid to

the

Manufacturer’s factory within 30 days of return authorization date. Any shipment returned to the factory collect will be
refused.

If an item is found to be warrantable, the repaired item or replacement will be returned normal ground freight prepaid
within the continental United States and Canada. Expedited shipment costs are the responsibility of the requestor.

Any replacement part or material is warranted only to the extent of the remaining warranty period of the dryer or to
the extent as provided by the supplier, whichever is longer.

Identification Plate

The identification plate is located on the back of the dryer and shows all the primary data of the machine. Upon
installation, fill in the table on the previous page with all the data shown on the identification plate. This data should
always be referred to when calling the manufacturer or distributor.
The removal or alteration of the identification plate will void the warranty rights.

DISCLAIMER

The warranty does not cover any responsibility or liability for direct or indirect damages to persons, or equipment
caused by improper usage or maintenance, and is limited to manufacturing defects only. Refer to COAIRE Warranty
policy manual for travel, mileage and special charge considerations. The warranty will be immediately voided if there
are changes or alterations to the dryer.

WHO TO CONTACT IF YOU HAVE A WARRANTY CLAIM:

COAIRE

Technologies,

Corporation

Phone

(562)

463-3935

Fax

(562) 463-4928

All freight damage claims should be filed within 15 working days and should be directed to the carrier.

TABLE OF CONTENTS

SAFETY RULES

1.1

Explanation of Convention Symbols Used in This Manual

1.2 Warnings
1.3

Proper Use of the Dryer

INSTALLATION

2.1

Transporting the Unit

2.2 Installation

site

2.3 Installation

layout

2.4

Connection to the Compressed Air System

2.5

Connection to the Main Power

2.6 Condensate

Drain

3. START

3.1 Preliminary

Operations

3.2

Initial Start Up

3.3

Operation and Shut-down

4. TECHNICAL

SPECIFICATIONS

4.1

Technical Specifications -CNCM10 & CNCM18 (115/1/60)

4.2

Technical Specifications- CNCM10 & CNCM18 (230/1/60)

TECHNICAL DESCRIPTION

5.1 Operation
5.2 Flow

diagram

5.3 Refrigeration

Compressor

5.4 Condenser
5.5 Filter

Drier

5.6 Capillary

Tube

5.7 Evaporator
5.8

Hot Gas By-pass Solenoid Valve

5.9 Air-to-Air

Exchanger

5.10 Condensate

separator

5.11

DMC5 Air Dryer Controller

5.12

Electric Schematic -CNCM10 & CNCM18

MAINTENANCE AND SPARE PARTS

6.1 Maintenance

Schedule

6.2 Replacement

Parts

TROUBLESHOOTING

7.1 Troubleshooting

EXPLODED VIEW OF THE DRYER COMPONENTS

8.1

Table of components - Exploded view -CNCM1 & CNCM18

1.1 DEFINITION OF THE SAFETY SYMBOLS

Carefully read instruction manual before attempting any service or maintenance procedures on the dryer.

Caution warning sign. Risk of danger or possibility of damage to equipment, if related text is not followed properly.

Electrical hazard. Warning message indicates practices or procedures that could result in personal injury or fatality if not
followed correctly.

Danger hazard. Part or system under pressure.

Danger hazard. High temperature conditions exist during operation of system. Avoid contact until system or component
has dissipated heat.

Danger hazard. Treated air is not suitable for breathing purposes, serious injury or fatality may result if precautions are
not followed.

Danger hazard: In case of fire, use an approved fire extinguisher, Water is not an acceptable means in cases of
electrical fire

Danger hazard. Do not operate equipment with panels removed.

Maintenance or control operation to be performed by qualified personnel only

ARIA

AIR

LUFT

AIR

Compressed air inlet connection point.

ARIA

AIR

LUFT

AIR

Compressed air outlet connection point.

Condensate drain connection point.

Operations that can be performed by the operator of the machine, if qualified

NOTE :

Text that specifies items of note to be taken into account, does not involve safety precautions.

In designing this unit a lot of care has been devoted to environmental protection:

•

CFC free refrigerants

•

CFC free insulation parts

•

Energy saving design

•

Limited acoustic emission

•

Dryer and relevant packaging composed of recyclable materials

This symbol requests that the user heed environmental considerations and abide with suggestions annotated with this
symbol.

Experienced and trained personnel familiar with national and local codes, capable to perform the needed activities, identify and

avoid possible dangerous situations while handling, installing, using and servicing the machine.

Ensuring compliance to all

statutory regulations

1.2 WARNINGS

Compressed air is a highly hazardous energy source.
Never work on the dryer with pressure in the system.
Never point the compressed air or the condensate drain outlet hoses towards anybody.
The user is responsible for the proper installation of the dryer. Failure to follow instructions given in the “Installation” chapter will void
the warranty. Improper installation can create dangerous situations for personnel and/or damages to the machine could occur.

Only qualified personnel are authorized to service electrically powered devices. Before attempting maintenance, the
following conditions must be satisfied :
Ensure that main power is off, machine is locked out, tagged for service and power cannot be restored during service
operations.

Ensure that valves are shut and the air circuit is at atmospheric pressure. De-pressurize the dryer.

Warranty does not apply to any unit damaged by accident, modification, misuse, negligence or misapplication.
Unauthorized alterations will immediately void the warranty.

In case of fire, use an approved fire extinguisher, Water is not an acceptable means in cases of electrical fire.

1.3 PROPER USE OF THE DRYER

This dryer has been designed, manufactured and tested for the purpose of separating the humidity normally contained in
compressed air. Any other use has to be considered improper.
The Manufacturer will not be responsible for any problem arising from improper use; the user will responsible for any
resulting damage.
Moreover, the correct use requires the adherence to the installation instructions, specifically:

•

Voltage and frequency of the main power.

•

Pressure, temperature and flow-rate of the inlet air.

•

Ambient temperature

This dryer is supplied tested and fully assembled. The only operation left to the user is the piping connections to the
compressed air system in compliance with the instructions given in the following chapters.

The purpose of the machine is the removal of water and residual oil vapor present in compressed air. The dried air
cannot be used for respiration purposes or for operations leading to direct contact with food products.
This dryer is nor suitable for the treatment of dirty air or of air containing solid particles.

2.1 TRANSPORTING THE UNIT

Check for visible loss or damage, if no visible damage is found place the unit near to the installation point and unpack the
contents.

•

Always keep the dryer in the upright vertical position. Damage to components could result if unit is laid on it’s side or if

placed upside down.

•

Store machine in a clean, dry environment, do not expose to severe weather environments.

The packaging materials are recyclable. Dispose of material in compliance with the rules and regulations in force in the
destination country.

2.2 INSTALLATION SITE

Failure to install dryer in the proper ambient conditions will affect the dryer’s ability to condense refrigerant gas.
This can cause higher loads on the compressor, loss of dryer efficiency and performance, overheated condenser
fan motors, electrical component failure and dryer failure due to the following: compressor loss, fan motor failure
and electrical component failure. Failures of this type will affect warranty considerations.
Do not install dryer in an environment of corrosive chemicals, explosive gasses, poisonous gasses, steam heat,
areas of high ambient conditions or extreme dust and dirt.

In case of fire, use an approved fire extinguisher, Water is not an acceptable means in cases of electrical fire.

Minimal installation requirements:

•

Select a clean dry room, free from dust, and protected from atmospheric disturbances.

•

The supporting plate must be smooth, horizontal and able to hold the weight of the dryer.

•

Minimum ambient temperatures 34°F see the data plate for maximum temperature.

•

Allow at least 16 inches of clearance on each side of the dryer for proper ventilation and to facilitate

maintenance operations.

The dryer doesn't require to be fixed to the supporting surface. Locks will be required for special installations
(on brackets, hanging, etc.).

2.3 INSTALLATION LAYOUT

Air compressor

Final filter

Aftercooler

Dryer

Condensate separator

By-pass group (optional)

Pre-Filter

Condensate drain

Compressed air receiver

Correction factor for inlet air pressure changes:
Inlet

air

pressure

psig

60 70 85 100 115 130 140 155 170 200 232

Factor

0.70 0.85 0.93 1.00 1.06 1.11 1.15 1.18 1.21 1.25 1.28

Correction factor for ambient temperature changes:
Ambient temperature

ºF

100

110

115

Factor

1.09 1.06 1.00 0.90 0.83

Correction factor for inlet air temperature changes:
Air temperature

ºF

100

110

115

Factor

1.15 1.00 0.82 0.75

Correction factor for DewPoint changes:
DewPoint

ºF

38 40 44 47 50

Factor

1.00 1.05 1.10 1.15 1.20

OUT

2.4 CONNECTION TO THE COMPRESSED AIR SYSTEM

Operations to be performed by qualified personnel only. Never work on compressed air piping under pressure.
The user is responsible to ensure that the dryer will never be operated with pressure exceeding the maximum

pressure rating on the unit data tag. Over pressurizing the dryer could be dangerous for both the operator and the
machine

The air temperature and the scfm entering the dryer must comply with the limits reported on the data nameplate. The

system connecting piping must be kept free from dust, rust, chips and other impurities, and must be consistent with

the flow-rate of the dryer.

In order to perform maintenance operations, it recommended that by-pass piping be installed, as shown in illustration

1.1.

Illustration 1.1

Particular measures have been taken to reduce the amount of vibration that could occur during the operation.
Therefore, we recommend the use of connecting pipes that are able to insulate the vibration. (Flexible hoses,
vibration damping fittings, etc.)

2.5 Electrical Connections

Qualified personnel should carry out connections to the main power. Be sure to check the local codes in
your area.

Before connecting the unit to the electrical supply, verify the data nameplate for the proper electrical information.
Voltage tolerance is +/- 5%.

115/1/60 dryers are supplied with a standard North American power cord and plug assembly (two poles and a
ground.

230/1/60 dryers are supplied with a standard North American power cord and plug assembly (two poles and a
ground. Be sure to provide the proper fuses or breakers based on the data tag information located on the back of the
unit. The main power receptacle must be protected with a thermal overload relay

∆

n+0.03A), rated to the power

consumption of the dryer (refer to data nameplate for nominal values). The power supply cord must meet or exceed
ratings for the total amp draw of the unit.

Connect to a properly grounded outlet. Improper connection of the equipment-grounding conductor can result in risk
of electric shock. Do not use adapters on the plug receptacle- if it will fit the outlet, have a proper outlet installed by a
qualified electrician.

2.6 CONDENSATE DRAIN

Discharge is at system pressure. Drain line should be secured.
Never point the condensate drain line towards anybody.

The dryer comes with a flexible plastic drain tube (1/4”in diameter and 60in long) for the connection to suitable drain.
Removal of the condensate occurs through a solenoid valve protected with a mechanical filter. In order to avoid
clogging of the solenoid valve, the condensate from the cyclone separator is previously filtered, than discharged. An
adjustable electronic timer operates the solenoid valve coil.
The drain cannot be connected to pressurized systems.

Condensate may contain oil. Comply with applicable laws concerning disposal.
A water-oil separator should be installed before the air inlet to the dryer for the purpose of removing
condensate drainage coming from compressors, dryers, tanks, filters, etc.

DRYER

INLET

OUTLET

DRYER

FROM

COMPRESSOR

OF USE

TO POINT

3.1 PRELIMINARY OPERATION

Verify that the operating parameters match with the nominal values reported on the data nameplate of the dryer
(voltage, frequency, air pressure, air temperature, ambient temperature, etc.).

This dryer has been thoroughly tested, packaged and inspected prior to shipment. Nevertheless, the unit could be
damaged during transportation, check the integrity of the dryer during initial start-up and monitor operation during the
first hours of operation.

Qualified personnel must perform the initial start-up.
When installing and operating this equipment, comply with all

National Electrical Code and any applicable

federal, state and local codes.

3.2 INITIAL START-UP

This procedure should be followed on initial start-up, after periods of extended shutdown or following
maintenance procedures.
Qualified personnel must perform the start-up.

Sequence of operations:

•

Ensure all steps of the “Installation” chapter have been followed.

•

Confirm that all piping and electrical connections are proper..

•

Ensure condensate drain lines are properly fastened and connected to a suitable drain system.

•

If a by-pass is installed around the dryer, close the inlet and outlet isolation valves, open the by-pass valve.

•

Verify that the manual valve mounted on condensate drain circuit is open.

•

Remove all packaging and other material that could obstruct the area around the dryer.

•

Turn on the main power to the unit

•

Move the rocker “

ON/OFF

” switch to the “

ON”

position (in the on position the switch should be illuminated).

•

Compare amp draw to nominal values on the data nameplate.

•

Verify the operation of the condensate drain circuit - wait for first activation.

•

Allow the dryer temperature to stabilize at the pre-set value.

•

Slowly open the air inlet valve.

•

Slowly open the air outlet valve.

•

Slowly close the central by-pass valve of the system

•

Check the piping for air leakage.

3.3 START-UP AND SHUT DOWN

Operation :

•

Check the condenser for cleanliness.

•

Verify power to the system.

•

Move the rocker “

ON/OFF

” switch to the “

ON”

position.

•

Turn on the air compressor.

Switching off :

•

Switch off the air compressor.

•

After few minutes, Move the rocker “

ON/OFF

” switch of the dryer to the “OFF” position.

During the operation, the refrigeration compressor and the condenser unit fan will run continuously.
The dryer must remain ON whenever compressed air is being used, even if the air compressor only loads
intermittently.

OUTLET

INLET

Sortie

Entrée

4.1 TECHNICAL SPECIFICATIONS CNC18-CNC75 (115/1/60)

D R Y E R M O D E L

CNCM10

CNCM18

Air flow rate at nominal condition

[scfm]

[Nl/min]

[Nm

/h]

285

425

Pressure DewPoint at nominal condition

[°F - °C]

38 – 3.3

Nominal ambient temperature

[°F - °C]

100 - 37.8

Max. ambient temperature

[°F - °C]

115 – 45

Min. ambient temperature

[°F - °C]

34 – 1

Nominal inlet air temperature

[°F - °C]

100 - 37.8

Max. inlet air temperature

[°F - °C]

115 – 45

Nominal inlet air pressure

[psig – barg]

100 - 6.9

Max. inlet air pressure

[psig - barg]

232 – 16

Max. outlet air pressure drop -

∆

[psi – bar]

4.4 - 0.3

Inlet-outlet air connection

Copper pipe OD 3/8 in. (9.52 mm)

Refrigerant type

R134.a (HFC) - CH

F-CF

Refrigerant charging

[oz – g]

6.1/8 - 175

12.3/8 - 350

Cooling air capacity

[cfm - m

/h]

120 - 200

200 - 340

Power supply

[Phase/V/Hz]

115/1/60

Nominal electric consumption

[A]

2.2

3.0

Max. electric consumption

[A]

2.9

4.2

Compressor power

[HP]

1/8

1/5

Weight

[lbs - kg]

62 - 28

68 - 31

Max. noise level

< 70 dbA at 40in (1m)

The nominal condition refers to an ambient temperature of 100°F with inlet air at 100 psig and 100°F

Inches mm
A 14.562  370
B 17.625  449
C 17.437  443
D 2.500

E 1.375

F 2.00 51
G 2.750

H 15.562  395
I 1.062  27
J 2.437  62
K .375

L 1.00 26
M .562

1-Rocker On/Off Switch-Illuminated
2-Power Supply Cord
3-Condensate Drain

OUTLET

INLET

Sortie

Entrée

4.2 TECHNICAL SPECIFICATIONS CNC18-CNC75 (230/1/60)

D R Y E R M O D E L

CNCM10

CNCM18

Air flow rate at nominal condition

[scfm]

[Nl/min]

[Nm

/h]

285

425

Pressure DewPoint at nominal condition

[°F - °C]

38 – 3.3

Nominal ambient temperature

[°F - °C]

100 - 37.8

Max. ambient temperature

[°F - °C]

115 – 45

Min. ambient temperature

[°F - °C]

34 – 1

Nominal inlet air temperature

[°F - °C]

100 - 37.8

Max. inlet air temperature

[°F - °C]

115 – 45

Nominal inlet air pressure

[psig – barg]

100 - 6.9

Max. inlet air pressure

[psig - barg]

232 – 16

Max. outlet air pressure drop -

∆

[psi – bar]

4.4 - 0.3

Inlet-outlet air connection

Copper pipe OD 3/8 in. (9.52 mm)

Refrigerant type

R134.a (HFC) - CH

F-CF

Refrigerant charging

[oz – g]

6.1/8 - 175

12.3/8 - 350

Cooling air capacity

[cfm - m

/h]

120 - 200

200 - 340

Power supply

[Phase/V/Hz]

230/1/60

Nominal electric consumption

[A]

1.1

1.4

Max. electric consumption

[A]

1.5

1.7

Compressor power

[HP]

1/8

1/5

Weight

[lbs - kg]

62 - 28

68 - 31

Max. noise level

< 70 dbA at 40in (1m)

The nominal condition refers to an ambient temperature of 100°F with inlet air at 100 psig and 100°F

Inches mm
A 14.562  370
B 17.625  449
C 17.437  443
D 2.500

E 1.375

F 2.00 51
G 2.750

H 15.562  395
I 1.062  27
J 2.437  62
K .375

L 1.00 26
M .562

1-Rocker On/Off Switch-Illuminated
2-Power Supply Cord
3-Condensate Drain

5.1 OPERATION

Operating principal-

The dryer models described in this manual operate all on the same principal. The hot moisture laden air enters an

air to air heat exchanger. The air then goes through the evaporator, also known as the air to refrigerant heat exchanger. The
temperature of the air is reduced to approximately 35-39 degrees Fahrenheit, causing water vapor to condense to liquid. The liquid is
continuously coalesced and collected in the separator for removal by the condensate drain. The cool moisture free air then passes back
through the air to air heat exchanger to be reheated to within fifteen degrees of the incoming air temperature as it exits the dryer.

Refrigerant circuit

- Refrigerant (R-134a) gas is cycled through the compressor and exits at high pressure to an air condenser where

heat is removed causing the refrigerant to condense to a high pressure liquid state. The liquid is forced through a metering device
(capillary tube) where the resulting pressure drop allows the refrigerant to boil off at a predetermined temperature. Low pressure liquid
refrigerant enters the heat exchanger where heat from the incoming air is transferred causing the refrigerant to boil, the resulting phase
change produces a low pressure, low temperature gas. The low pressure gas is returned to the compressor, where it is re-
compressed and begins the cycle again. During those periods when the compressed air load is reduced the excess refrigerant is by-
passed automatically back to the compressor via the hot gas by-pass valve circuit.

5.5 AIR/REFRIGERANT FLOW DIAGRAM CNCM10-CNCM18

ELE

Refrigeration compressor

Condensate separator

Condenser unit

Condensate drain valve/strainer

Solid filter drier

10 Condensate drain solenoid valve

Capillary tube

11 Condenser unit fan

Evaporator - Air-to-refrigerant heat exchanger

12 Electronic controller – DMC5

Hot gas by-pass solenoid valve

13 DewPoint temperature probe

Air-to-air heat exchanger

14 By-pass system (optional)

Air flow direction

Refrigerant flow direction

5.3 REFRIGERATION COMPRESSOR

The refrigeration compressor is the pump of the system where the gas coming from the evaporator (low pressure side) is compressed up
to the condensation pressure (high pressure side). The compressors utilized are manufactured by primary companies and are designed
for applications where high compression ratios and wide temperature changes are present.
The fully sealed construction is perfectly gas tight, so ensuring high-energy efficiency and long useful life. Dumping springs supports the
pumping unit, in order to consistently reduce the acoustic emission and the vibration diffusion.
The electric motor is cooled by the aspirated refrigerating gas, which goes through the coils before reaching the compression cylinders.
The thermal protection protects the compressor from over heating and over currents. The protection is automatically restored as soon as
the nominal temperature conditions are reached.

5.4 CONDENSER UNIT

The condenser is the element in which the gas coming from the compressor is cooled down and condensed becoming a liquid.
Mechanically, a copper tubing circuit (with the gas flowing inside) forms it immersed in an aluminum fin package. The cooling operation
occurs via a high efficiency fan, which, in applying pressure on the air contained within the dryer, forces it into the fin package. It’s
mandatory that the temperature of the ambient air will not exceed the nominal values. It is also important

TO KEEP THE UNIT FREE

FORM DUST AND OTHER IMPURITIES

5.5 FILTER DRIER

Traces of humidity and slag can accumulate inside the refrigeration circuit, or long periods of use can produce sludge, could limit the
lubrication of the compressor and clog the expansion valve or capillary tube.
The function of the filter drier, located before the capillary tubing, is to stop the impurities, avoiding their circulation within the system.

5.6 CAPILLARY TUBE

It consists of a piece of reduced cross section copper tubing located between the condenser and the evaporator and acts as a metering
device to reduce the pressure of the refrigerant. Reduction of pressure is a function of the temperature to be reached within the
evaporator: the smaller the capillary tube outlet pressure, the lower the evaporation temperature.

The length and interior diameter of the capillary tubing is accurately sized with the performance to be reached by the dryer; no
maintenance or adjustment is necessary.

5.7 EVAPORATOR

Also called an air-refrigerant exchanger. The liquid refrigerant formed in the condenser is evaporated in this part of the circuit. In the
evaporation phase the refrigerant side of the evaporator tends to absorb heat from the compressed air present in the other side of the
exchanger. The evaporator is immersed in the cabinet base of the dryer and insulated with non-CFC expanded insulating foam. The part
is entirely constructed in copper and the cooler goes in the opposite direction to the air, thus contributing to limited pressure loss and to
provide efficient thermal exchange.

5.8 HOT GAS BY-PASS SOLENOID VALVE

This valve is located between the pressure side of the compressor and the terminal side of the evaporator.
Its purpose is to avoid conditions of low thermal charge in the dryer (low air flow or relatively cold air)
The temperature inside the evaporators will drop below 32ºF. Temperature below 32ºF would eventually allow the formation of ice inside
the evaporator, with the consequent blockage of air flow and, in the worst of the cases, the rupture of the evaporator itself. The DMC11
Controller activates the coil of the solenoid valve.

5.9 AIR-TO-AIR EXCHANGER

The purpose of this exchanger is the transmission of the heat of the incoming air to the exiting cold air. The benefits of this solution are
basically twofold: the incoming air is partially cooled down. Therefore the chilling system can be sized for a lower thermal drop, thus
allowing a 40-50% energy saving; moreover, cool air will never reach the compressed air circuit and condensate will not form on the
external surface of the piping.

5.10 CONDENSATE SEPARATOR

The cold air exiting the evaporator circulates into the centrifugal type condensate separator. By means of a winged diaphragm, the
incoming air attains a high-speed rotary motion. Therefore, due the centrifugal force, the condensed particles are projected onto the
lateral surface and then migrate to the bottom, which acts as an accumulation reservoir for the separated condensate and is expelled by
the drain solenoid valve at regular intervals. The resulting condensate free air exits the separator and is driven into the air-to-air
exchanger.
The centrifugal type separator offers the advantage of high efficiency, even with variable flow-rates. It doesn’t require maintenance, it
does not clog and it is able to separate solid particles as well.

5.11 DMC5 AIR DRYER CONTROLLER

4 5

2 3

°C

- +

COM

B D

PROBE

DIPS

Trimmer

The DMC5 Air Dryer Controller controls the operation of the dryer, and allows
adjustment to the operating parameters. A temperature-dependent semiconductor
probe located at the end of the evaporator controls the hot-gas solenoid valve
activation. An electronic timer drives the condensate drain solenoid valve at regular
intervals.

The DMC5 Air Dryer Controller is preset to factory specifications for typical use. The
following parameters can be changed to meet specific user requirements:

The parameters which can be set up are the following :

SET-POINT SET-UP

Set-Point is the activation temperature of the hot-gas by-pass solenoid valve.
Factory specification for Set Point is 37.4 to 39.2 °F (3 to 4 °C), with a fix hysteresis -

∆

t - equal to 0.9 °F (0.5 ºC). The hot gas by-pass

solenoid valve is activated when the temperature falls below 37.4 to 39.2 °F (3 to 4 °C) and deactivated when the temperature rises over
38.3 to 40.1 °F (3.5 to 4.5 °C).

To adjust the Set Point perform the following steps:

•

Put a thermometer in the vacant copper well near the similar copper well that houses the DMC probe (insert the thermometer to the

bottom of the copper well).

•

Remove the air flow and switch ON the dryer and wait a few minutes.

•

Using a small screw driver rotate the set-point adjusting trimmer so the hot gas solenoid valve coil energizes at a temperature

between 37.4 and 39.2 °F (from 3 to 4 °C). By rotating the trimmer clockwise, the set-point will increase up to a top value of approx.
50°F (10°C); by rotating the trimmer counter clockwise, the set-point will decrease down to a minimum value of approx 32°F (0°C).

NOTE: TO BE PERFORMED BY AUTHORIZED PERSONNEL ONLY! WARRANTY WILL BE VOIDED IF DONE INCORRECTLY.

DRAINING TIME SET-UP

There are two adjustable parameters related to drain timing:

•

- condensate drain solenoid valve activation duration time.

•

OFF

- Interval time between activation of the condensate drain solenoid valve.

To modify these two times, simply move the 6 micro-switches (DIPS) following the schedule below:

OFF

- pause time

- activation time

DIPS

D+E+F

D+E

D+F

E+F

F E D C B A

Time

[sec]

210 180 150 90 30 60 120 1

DIPS A, B & C adjust activation time (T

DIPS D, E & F adjust pause time (T

OFF

); pause time can be cumulated (i.e. DIPS E+F, D+F, D+E and D+E+F).

Standard setting: DIP B and E set to ON equal to T

= 2 sec and T

OFF

= 60 sec. Drain solenoid valve will be activated 2 seconds every

60 seconds.

5.21 ELECTRICAL SCHEMATIC CNCM10 & CNCM18

Air Dryer Controller

EVB

COM

Sonde

EVD

DMC5

PROBE

PO
WE
R

Pui
ssa
nce

Legend:

: Rocker On/Off switch

: Condenser fan motor

: Refrigeration compressor

: DMC5 probe

: Compressor start-up relay

EVB

: Hot gas by-pass solenoid valve

: Compressor electric motor

EVD

: Condensate drain solenoid valve

: Compressor thermal protection

6.1 MAINTENANCE SCHEDULE

Only qualified personnel should perform maintenance operations.
Prior to performing any maintenance or service, be sure that:

•

Ensure that the power is off and the unit is at atmospheric pressure.

•

Main power circuit breaker is in the off position per lock out/tag out procedures.

•

Ensure that maintenance personnel have read and understand the safety and operations instructions in
this manual.

High temperature conditions exist during operation of system. Avoid contact until system or component
has dissipated heat.

DAILY

•

Verify that the DewPoint displayed on the DMC11 is correct.

•

Check the proper operation of the condensate drain system.

•

Inspect the condenser for cleanliness.

EVERY 200 HOURS OR MONTHLY

•

Blow entire unit out with compressed air (Max. 30 psig - 2 barg)

•

Blow condenser coils out with compressed air.

•

Close the manual condensate drain valve, remove the mechanical filter and clean it with compressed air
and a brush. Reinstall the filter, make sure it is tight, and open the manual valve.

•

Verify operation of the machine.

EVERY 1000 HOURS OR YEARLY

•

Tighten all electrical connections. Look for broken, cracked or bare wires.

•

Inspect refrigeration circuit for signs of oil and refrigerant leakage.

•

Measure and record amperage. Verify that readings are within acceptable parameters as listed in
specification table.

•

Inspect condensate drain flexible hoses, and replace if necessary.

•

Verify operation of the machine

6.2 REPLACEMENT PARTS

= Suggested spare part.

D E S C R I P T I O N P a r t

N u m b e r

C N C M 1 0
1 1 5 / 1 / 6 0

C N C M 1 8
1 1 5 / 1 / 6 0

C N C M 1 0
2 3 0 / 1 / 6 0

C N C M 1 8
2 3 0 / 1 / 6 0

Refrigeration compressor

5015135001

Refrigeration compressor

5015135005

Refrigeration compressor

5015110001

Refrigeration compressor

5015110004

Fan motor

5210135005

Fan motor

5210135010

Fan motor

5215000010

Fan blade

5215000005

Fan blade

5215000019

Fan grid

5225000010

DMC5 Air Dryer Controller 115V

5620130105

DMC5 Air Dryer Controller 230V

DMC5 Probe

5625NNN005

Lighted main switch

5450SZN010

Condensate drain valve/strainer

64355MN012

Condensate drain solenoid valve – body

64320FF005

Condensate drain solenoid valve – coil 115V

64N22MM035

Condensate drain solenoid valve – coil 230V

64N22MM005

By-pass solenoid valve - body

64120SS005

By-pass solenoid valve – coil 115V

64N22MM055

By-pass solenoid valve – coil 230V

64N22MM060

NOTE: When ordering a replacement part, have information from data nameplate available.

7.1 TROUBLESHOOTING

Only qualified personnel should perform maintenance operations.
Prior to performing any maintenance or service, be sure that:

•

Ensure that the power is off and the unit is at atmospheric pressure.

•

Main power circuit breaker is in the off position per lock out/tag out procedures.

•

Ensure that maintenance personnel have read and understand the safety and operations instructions in
this manual.

•

High temperature conditions exist during operation of system. Avoid contact until system or component
has dissipated heat.

SYMPTOM

POSSIBLE CAUSE - SUGGESTED ACTION

The machine doesn't start.

Check inlet power.

Verify electric wiring connections.

Check continuity of On/Off switch

The compressor doesn’t work.

Activation of the internal thermal protection - wait for 30 minutes, then retry.

Verify the electric wiring.

Replace the internal thermal protection.

If present, replace the start-up relay.

If present, replace the start-up capacitor.

If present, replace the run capacitor.

If the compressor doesn’t work yet, replace it.

The condenser fan doesn’t work.

Verify the electric wiring.

If the fan still doesn’t work, replace it.

DewPoint too high.

The dryer is off - switch it on.

The compressor doesn’t work - see specific point.

The condenser fan doesn’t work - see specific point.

The inlet air is too hot - restore the nominal conditions.

The inlet air flow rate is higher than the rate of the dryer - reduce the flow rate -

restore the normal conditions.

The ambient temperature is too high or the room ventilation is insufficient -

provide proper ventilation.

The set-point of the DMC5 is too high - see paragraph SET-UP of the DMC5.

The condenser is dirty - clean it.

The dryer doesn’t drain the condensate - see specific point.

There is a leak in the refrigeration circuit - contact a certified refrigeration

technician

DewPoint too low.

Verify wiring of the DMC5.

Verify wiring of the DMC5 probe

Verify wiring of the hot gas by pass solenoid valve.

The electric coil of the hot gas by-pass solenoid valve may have burned out –
test resistance/ replace it.

The probe of the DMC5 does not properly detect the temperature of the
evaporator – push the probe until it reaches the bottom of the measurement
well.

The set-point of the DMC5 is very low - see paragraph SET-UP of the DMC5.

DMC5 Air Dryer Controller doesn’t work - replace it.

The hot gas solenoid valve is blocked - contact a certified refrigeration
technician.

Excessive pressure drop within the

dryer.

The DewPoint is too low - the condensate is frozen and blocks air flow - see

specific point.

Check for throttling the flexible connection hoses.

The condensate is not draining

Verify the electric wiring.

The condensate drain mechanical filter is clogged - remove and clean it.

The drain solenoid valve is jammed - remove and clean it.

The electrical coil on the condensate drain solenoid valve may be burned out- test

resistance/replace it.

DMC5 doesn’t work - replace it.

The DewPoint is too low - the condensate is frozen - see specific point.

The dryer continuously drains

condensate.

The drain solenoid valve is jammed - remove and clean it.

Verify the electric wiring.

DMC5 doesn’t work - replace it.

Water within the line.

The dryer is off - switch it on.

Untreated air flows through the by-pass unit (if installed) - close the by-pass.

The dryer doesn’t drain condensate - see specific point.

DewPoint too high - see specific point.

8.1 TABLE OF COMPONENTS - EXPLODED VIEW –CNCM10 & CNCM18

The components table given below refers to the relevant exploded views attached to this manual.

Heat exchanger group

Cabinet - Front panel

Refrigeration compressor

Cabinet - Rear panel

Condenser unit

Cabinet - Cover panel

Condenser unit fan

Cabinet - Lateral panel

Solid filter dryer

Inlet/Outlet connections

Hot gas by-pass solenoid valve

Rocker switch-Illuminated

Condensate drain valve/strainer

DMC5 Air Dryer Controller

Condensate drain solenoid valve

DewPoint copper tube immersion well

For complete line of additional product information, please contact your local COAIRE

distributor.

DISTRIBUTED BY

COAIRE Technologies reverse the right to make changes, at any time without notice

as a result of our commitment to continuous improvement.

Coaire Technologies Corporation

12226 Coast Drive, Whittier, CA 90601

◊

TEL.(562)463-3935

◊

(562)463-4928

website: www.coaire.com

■

e-mail: sales@coaire.com/support@coaire.com

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