Omi Dd36 User manual

DIRECT EXPANSION COMPRESSED AIR DRYERS

Operators Manual

DD36

DD54

DD72

DD108

DD144

DD180

DD216

DD280

DD340

DD500

DD610

DD750

DD1000

DD1300

- EN -

CONTENTS

1. GENERAL INFORMATION

1.1 Functional description 2

1.2 Safe use of the dryer 2

2. INSTALLATION

2.1 Acceptance and transportation 3

2.2 Installation site 3

2.3Unpacking 3

2.4 Installation 4

3. START UP

3.1 Control panel 5

3.1.1 Keys function 6

3.1.2 Condensate discharge parameters programming 6

3.1.3 Anomaly warning 7

3.1.4 Remote signalling alarm 7

3.2 Before start up 7

3.3 Start up 8

4. MAINTENANCE, TROUBLESHOOTING AND DISMANTLING

4.1 Maintenance 8

4.2 Troubleshooting 9

4.3 Decommissioning 11

5. SAFETY INFORMATIONS

5.1 General safety instructions 12

5.2 Equipment nameplates values 12

5.3 Informations about remaining risk of the equipment 12

ATTACHMENTS TO THIS MANUAL

A) Refrigerant circuit

B) Electric circuit diagram

C) Technical data sheet

D) Correction factors

E) Dryer dimensions

F) Basic spare parts

- EN -

INTRODUCTION

This manual is an integral part of the dryer you bought, and must remain with the machine even if this will be resold.

It is highly recommended that the qualified*personnel for installation maintenance and/or control will fully comply with the contents

of this manual and the prevention and safety rules in force in the country where the system will be used. In this way, not only the usage

of the machine will be rational, but also the service will result cost effective.

In case your dryer will present any kind of problem, please contact your local authorizedOMI distributor.

Please note that, when necessary, the use of original spare parts will ensure efficiency and long duration to your dryer.

Due to the continuous technological evolution,OMI reserves the right to modify the specifications contained in this manual without

giving previous notice.

SYMBOLS AND LABELS USED IN THE MANUAL AND ON THE DRYER

o o o

Punto ingresso aria.

o o o

Punto uscita aria.

Read the Operators manual before attempt to start

up the machine and to perform any service

operation on the dryer.

Pay particular attention to components or systems

under pressure.

Pay particular attention to the indications preceded

by these symbols.

Pay particular attention to hot surfaces.

Installation, maintenance, and/or control operations

preceded by these symbols must be performed

exclusively by qualified personnel*.

Pay particular attention to the risk of electric shock.

Condensate drain point.

Rotation direction of the fan.

Pay particular attention to the risk of moving parts

Explosion risk.

Lifting point.

Don’t lift from this point.

Attention: Before performing any

maintenance operation on this

machine, do not forget to disconnect

the electric supply, to completely

discharge air pressure, and to refer to

the Operators manual.

* Qualified personnel must be trained and certified in accordance with local laws and regulations.

WARRANTY

The Company warrants that the equipment manufactured by it and delivered hereunder will be free of defects in material and

workmanship for a period of twelve months from the date of placing the Equipment in operation or eighteen months from the date of

shipment from the factory, whichever shall first occur. The Purchaser shall be obligated to promptly report any failure to conform to this

warranty, in writing to the Company in said period, whereupon the Company shall, at its option, correct such nonconformity, by suitable

repair to such equipment or, furnish a replacement part F.O.B. point of shipment, provided the Purchaser has stored, installed,

maintained and operated such Equipment in accordance with good industry practices and has complied with specific recommendations

of the Company. Accessories or equipment furnished by the Company, but manufactured by others, shall carry whatever warranty the

manufacturers have conveyed to the Company and which can be passed on to the Purchaser. The Company shall not be liable for any

repairs, replacements, or adjustments to the Equipment or any costs of labor performed by the Purchaser or others without Company's

prior written approval.

The effects of corrosion, erosion and normal wear and tear are specifically excluded. Performance warranties are limited to those

specifically stated within the Company's proposal. Unless responsibility for meeting such performance warranties are limited to specified

tests, the Company's obligation shall be to correct in the manner and for the period of time provided above.

THE COMPANY MAKES NO OTHER WARRANTY OR REPRESENTATION OF ANY KIND WHATSOEVER, EXPRESSED OR

IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE, ARE HERBY DISCLAIMED.

Correction by the Company of nonconformities whether patent or latent, in the manner and for the period of time provided above,

shall constitute fulfillment of all liabilities of the Company for such nonconformities whether based on contract, warranty negligence,

indemnity, strict liability or otherwise with respect to or arising out of such Equipment.

The Purchaser shall not operate Equipment which is considered to be defective, without first notifying the Company in writing of its

intention to do so. Any such use of Equipment will be at Purchaser's sole risk and liability.

Note that this isOMI standard warranty. Any warranty in force at the time of purchase of the equipment or negotiated as part of the

purchase order may take precedence over this warranty.

1. GENERAL INFORMATION

1.1 FUNCTIONAL DESCRIPTION

OMI refrigerated air dryers remove moisture from compressed air. Moisture is detrimental to pneumatically operated appliances,

controls, instruments, machinery and tools.

Compressed air enters the patented aluminum heat exchanger where it is cooled down to the dew point temperature in two different

stages: In the first air/air sector compressed inlet air is cooled thanks to the colder compressed air coming out counterflow from the

condensate separator. In the second refrigerant / air sector, compressed air temperature is further lowered to the dewpoint temperature.

During this two stages almost all the oil and water vapours contained in compressed air are condensed to liquid and successively be

separated from the compressed air in the condensate separator and drained out by the automatic drain. At this point the obtained cold

air re-enters counterflow the initial air / air exchanger and it is reheated by the inlet hot air with the consequence of energy recovering

and also reduction of the relative humidity contained in the outflowing air.

This dryer can be easily installed into various pneumatic systems in which dry air is required or desired. Please refer to Principles

of Operation for complete operating details.

The dryer comes provided with all the control, safety and adjustment devices, therefore no auxiliary devices are needed.

A system overload not exceeding the maximum operative limits can worsen the operational performance of the dryer (high

dew point), but it will not affect its safety.

The electric diagram (attachment B) shows the minimum protection degree IP 42.

Improper grounding can result in electrical shock and can cause severe injury or death.

This product must be connected to a grounded, metallic, permanent wiring system or an equipment-grounding terminal or

lead on the product.

All grounding must be performed by a qualified electrician and comply with national and local electrical codes.

In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the

electric current.

Ground must be established with a bare grounding wire sized according to the voltage and minimum branch circuit

requirements.

Ensure good bare metal contact at all grounding connection points, and ensure all connections are clean and tight.

Check grounding connections after initial installation and periodically thereafter to ensure good contact and continuity has

been maintained.

Check with a qualified electrician or service technician if the grounding instructions are not completely understood, or if in

doubt as to whether the product is properly grounded.

This dryer is designed to work only with compressed air. For a different use, please contact your

distributor OMI.

1.2 USE OF THE MACHINE IN SAFE CONDITIONS

This system has been designed and manufactured in compliance with the European safety directive in force, therefore any

installation, use and maintenance operations must be performed respecting the instructions contained in this manual.

Because an air dryer is pressurized and contains rotating parts, the same precautions should be observed as with any piece of

machinery of this type where carelessness in operation or maintenance could be hazardous to personnel. In addition to obvious safety

rules that should be followed with this type of machinery, safety precautions as listed below must be observed.

1. Only qualified personnel shall be permitted to adjust, perform maintenance or repair this air dryer.

2. Read all instructions completely before operating unit.

3. Pull main electrical disconnect switch and disconnect any separate control lines, if used, before attempting to work

or perform maintenance on the unit.

4. Do not attempt to service any part while machine is in an operational mode.

5. Do not attempt to remove any parts without first relieving the entire air system of pressure.

6. Do not attempt to remove any part of the refrigeration system without removing and containing refrigerant in

accordance with the EPA and local regulations.

7. Do not operate the dryer at pressures in excess of its rating.

8. Do not operate the dryer without guards, shields and screen in place.

9. Inspect unit daily to observe and correct any unsafe operating conditions.

2. INSTALLATION

2.1 ACCEPTANCE AND HANDLING

Upon receiving your OMI air dryer, please inspect the unit closely. If rough handling is detected, please note it on your delivery receipt,

especially if the dryer will not be uncrated immediately. Then obtain the freight carrier's signed agreement to any noted damages: this

is a precondition for any insurance claims by the customer.

It is mandatory to keep the dryer always in vertical position, as indicated by the symbols present on the packaging. For handling, use

devices having sufficient capacity for the weight of the machine.

Remove the packaging after having positioned the dryer in the installation site. For unpacking, refer to section 2.3.

Under no circumstances should any person attempt to lift heavy objects without proper lifting equipment (i.e., crane, hoist, slings or fork

truck). Lifting any unit without proper lifting equipment, may cause serious injury. Use fork lift channels where provided.

2.2 STORAGE AND INSTALLATION LOCATION

If not in use, the dryer can be stored in its packaging in a dust free and protected site between 32°F (0°C) and 120 °F (50 °C), and a

specific humidity not exceeding 90 %. Should the stocking time exceed 12 months, please contact your local OMI authorized distributor.

If the dryer is not used, it will be placed in a site with the following conditions:

The machine must be protected from atmospheric agents and not directly exposed to sun light.

A seating base flat and capable to hold the weight of the machine.

Ambient temperature complying with the nominal data of the dryer.

The dryer should be located in a clean area, without forced air draft that can affect the fan control system.

Make sure to leave sufficient clearance (20 inches, 500mm) around the dryer in order to allowan adequate cooling

of the machine and for maintenance and/or control operations.

The incoming air must be free from smoke or flammable vapours which could lead to explosion or fire risks.

2.3 UNPACKING

The packaging is made of carton or of cellophane. We recommend that you keep the original packaging for the device in case it has to

be transported to another location or sent to a service center. Dispose the various packaging materials in compliance with the relevant

rules locally in force.

unpack the device, removing the strapping from the carton. Always wear safety gloves when using scissors or other tools to cut

the straps or the cellophane;

remove the carton or the cellophane;

in case it’s necessary another handling of the device, refer to section 2.1;

remove the pallet (if present);

remove the operating manual, accessories and key from the device.

2.4 INSTALLATION

Before attempting any installation operation, make sure that

No parts of the air system are under pressure.

No parts of the system are electrically powered.

Tubing to be connected to the dryer are free of impurities.

The pipes to be connected to the dryer does not weigh on the device.

All interconnecting piping has been tightened.

After having verified the points listed above, you can proceed to the installation of the machine.

1. Connect the dryer to the compressed air lines. If not already existing, we suggest to install a by-pass allowing to

isolate the machine from the plant, thus to facilitate eventual maintenance operations.

2. Perform the electrical connection in accordance with any local laws and regulations after reviewing the dryer

electrical specifications and wiring diagram. In particular, if the power cord has no plug, install a disconnecting

device.

3. Check the condensate drainage assembly, and connect the drain flexible hose to the draining line, keeping in

mind that the condensate separated by the dryer may contain oil, therefore, in order to dispose of it in

compliance with the local rules in force, we suggest installing a water-oil separator having adequate

capacity.

4. Power the dryer after having checked that the nominal voltage and line frequency are constant and matching the

nominal values of the machine. The user must provide the installation with an adequate line protection and

a ground terminal complying with the electrical rules locally in force.

In order to optimise the use of the dryer, we suggest to place it in such a way that all the control instruments of the machine

will result easily visible.

A suitably sized prefilter must be installed before the dryer. Failure to install and maintain a proper prefilter will

void the dryer warranty. The rating for this filter must be at least 10 micron.

It is necessary for the user to install a protective device (a safety accessory) to protect the equipment under

pressure from the risk of exceeding the maximum allowable pressure (PS); it is necessary to install a protective

device to protect the equipment at high temperature from the risk of exceeding the maximum allowable

temperature.

3. START UP

Ensure that the dryer is by−passed, or there is no load on the cooler.

Switch on the main electrical isolation switch (if present). The control panel will show the message OFF, indicating that the line and

control voltages are available.

Start sequence

The dryer will initially start by pressing and holding the local ON/OFF button. The start sequence will progress only if there are no active

alarms. The compressor motor will start AFTER 120 SECONDS. The fan motor will start simultaneously with the compressor for DD280-

1000 models, after 30 seconds for smaller models.

Mod.DD1300: the fan motor is controlled only by the fan pressure switch.

Stop sequence

The dryer can be stopped locally from the control panel. After having pressed the ON/OFF switch for 1 second, the compressor and the

fan motor keep on running for further 10 seconds in order to re-balance the internal pressures. The dryer can be also stopped due to an

alarm or energy saving condition (ESA or ES2). Any alarm will de−energize the compressor, fan motor can still running, it depends on

the type of alarm (see Display indications chapter). If the shutdown is due to an alarm, a message will blink on display indicating the

reason for the shutdown. Energy saving condition (ESA or ES2) occurs when the dew point stands below the set value for a long time

in order to save energy and avoid heat exchanger freezing. This situation can happen when ambient temperature is low and there is

no compressed air load.

Variable speed fan control

A patented microprocessor allows to adjust dryer’s cooling capacity by changing the fan motor speed. If the dew point is greater than

the set value, the fan speed is increased, if the dew point is smaller than the set value, the fan velocity is decreased. The range can be

from 0 to 100% and the higher is the fan speed, the faster the fan LED blinks, you can read the exact value by pressing the UP button.

If the velocity is 100% you will read FL (Full Load). Under load standard condition the fan speed is usually at 100%, if there is no load

the fan velocity can oscillate between 0 and 20%.

In models DD280-1000, in order to adjust the greater dryer’s cooling capacity, a hot gas by-pass valve cooperates with the variable

speed system.

3.1 CONTROL PANEL

The dryers are provided with an electronic control system. All adjustments and resets can be performed by means of the digital panel

located on the front of the dryer. The control panel is composed of 5 keys (ON/OFF, TEST, SET, DOWN and UP) and a 3 digit display,

with three signalling LEDs indicated by icons (PIC 1)

PIC. 1

DISPLAY VISUALIZATION AND SIGNALLING LEDS (DD36 ÷ DD1000)

DISPLAY VISUALIZATION AND SIGNALLING LEDS (DD1300)

DISPLAY

DESCRIPTION

the unit is in ENERGY SAVING mode

the unit is ON with low load

the unit is ON with normal load

the unit is ON with normal-high load

the unit is ON with high load

LED

STATUS

DESCRIPTION

Compressor energized

Blinking

Programming mode activated

Condensate drain energized

Speed of the fan = 100%

Blinking

Speed of the fan < 100%

OFF

Fan not running

DISPLAY

DESCRIPTION

the unit is in ENERGY SAVING mode

the unit is ON with low load

the unit is ON with normal load

the unit is ON with normal-high load

the unit is ON with high load

LED

STATUS

DESCRIPTION

Compressor energized

Blinking

Programming mode activated

Condensate drain energized

Not used

3.1.1 KEYS FUNCTION

TEST: When pushed for 3 sec. during normal operation, it activates the condensate drain.

(Not used on No loss condensate drain)

SET: When pushed and released during normal operation, it displays the parameter C1.

When pushed for 10 seconds, it allows to enter the C8 and C9 condensate drain parameters programming menu (see

relevant table).

When pushed after having set new configuration values, it stores the applied modifications.

DOWN: When pushed while setting the drain set point, it decreases the displayed value of one unit per second, during the

first 10 seconds, than of one unit every 0,1 sec.

When pushed for 10 seconds during normal operation, it starts an automatic test cycle of the controller.

UP: When pushed while setting the drain set point, it increases the displayed value of one unit per second, during the first

10 seconds, than of one unit every 0,1 sec.

ON / OFF: Pressed, it activates or deactivates the dryer. When the dryer is deactivated, the display shows OFF.

NOTE: when the controller is in the OFF position, some parts of the dryer may still be energized. Therefore, for

safety purposes, disconnect the electrical power before performing any operation on the machine.

3.1.2 CONDENSATE DISCHARGE PARAMETERS PROGRAMMING

Push the SET key for 10 seconds to enter the parameters configuration menu: the display will show in sequence the

set point value, the code of the first modifiable parameter (C8) and its value).

Only if strictly necessary, use the UP and/or DOWN keys to change the displayed parameter value.

Press the SET key to store the previously changed parameter value or to browse the parameters without changing

them.

15 seconds after the last performed operation, the controller will return automatically to the normal operation mode.

PARAMETER

DESCRIPTION

RANGE

DEFAULT SET VALUE

Delay between condensate

discharges

1 ÷ 240 (min)

Time required for condensate

discharge

1 ÷ 240 (sec)

DD36-180

DD216

DD280-1300

NOTE: Changes entered for timing valueswill be effective onlyafter exiting the programming, while changes to other variables

will be immediately effective.

Please remember that eventual changes to the configuration parameters of the machine could negatively affect its efficiency.

Thus, changes have to be performed by a person familiar with the operation of the dryer.

WARNING FOR USER:IT’S FORBIDDEN TO ATTEMPT TO MODIFY THE OTHER CONFIGURATION PARAMETERS

OF THE ELECTRONIC CONTROLLER WITHOUT AUTHORIZATION AND COLLABORATION OFOMI’S

AUTHORIZED DISTRIBUTOR.

3.1.3 DISPLAY INDICATIONS

The controller is capable of recognizing certain types of anomalies in the drying circuit. In such cases, a message will blink on the

display, alternated to the current dew point value.

MESSAGE

(BLINKING)

CAUSE

OUTPUTS

ACTIONS

HtA

High dew point value

(delayed alarm)

Alarm output ON

Refrig. Compressor output OFF

Fan output ON

Drain cycle standard

Resettable by switching off the

dryer.

If problem persists call your local

OMI distributor.

Ht2

Very high dew point value

(immediate alarm)

PF1

Interruption or short circuit on the

PTC probe input line

Alarm output ON

Refrig. Compressor output OFF

Fan output OFF

Drain cycle standard

Resettable by switching off the

dryer. May require replacing the

faulty probe.

If problem persists call your local

OMI distributor.

ESA

The automatic Energy saving

mode activated due to low load

Alarm output OFF

Refrig. Compressor output OFF

Fan output OFF

Drain cycle standard

No action necessary.

Automatic Reset

ES2

ASt

Activated after repeated alarms

Alarm output ON

Refrig. Compressor output OFF

Fan output ON

Drain cycle standard

Call your local OMI distributor.

Note: PF1 has priority on all other messages.

3.1.4 REMOTE SIGNALING ALARM (OPTIONAL)

The dryer control board is equipped with a dry contact for a remote alarm signal. This is normally open

contact: when an alarm is detected, this contact is closed.

Proceed as follows to activate a remote alarm output:

1. The User must review the diagram below.

2. Disconnect the dryer from electrical power supply, remove cover and left side panel.

3. Connect the alarm circuit to the terminal blocks (See PIC.2).

4. Replace cover, left side panel and reconnect power.

Alarm Output relays electric features:

Max. 250VAC / 3A –AC 15 (Amp. Inductive)

PIC.2

The activation of the above function is at the User’s discretion. The User will purchase all necessary installation material.

Any operation which needs access to the dryer must be carried out by qualified personnel.

3.2 BEFORE START UP

Before starting the machine, make sure that all operating parameters correspond to the nominal data.

The dryer is supplied already tested and preset for normal operation, and it doesn’t require any calibration. Nevertheless,

it’s necessary to check the operating performances during the first working hours.

3.3 START UP

The operations specified below must be performed after the first start up and at each start up after a prolonged inactive

period of time due to maintenance operations, or any other reason.

1. Make sure that all instructions contained in chapters INSTALLATION SITE and INSTALLATION have been

observed.

2. Ensure dryer by-pass is open and air inlet/outlet valves closed. (if existing).

3. Activate power supply and press the ON/OFF switch on the control panel for at least 1 second.

(note there is a 2 minute delay before the dryer will start after the dryer is turned on).

Only on DD1300

- Turn main power switch on position 1.

- Wait for 8 hours before starting the dryer

(the warranty is not valid if this procedure is not respected).

IF THE UNIT FAILS TO START MAKE SURE THAT PHASES ARE CONNECTED CORRECTLY.

4. Wait 5 to 10 minutes until machine has achieved its standard operating parameters.

5. Slowly open the air outlet valve and successively open the air inlet valve.

6. If existent, close the air by-pass valve.

7. Check if the condensate drain is working properly.

8. Check if all connecting pipes are properly tightened and fixed.

Before disconnecting the dryer from electrical power supply, use ON/OFF switch to stop the dryer.

Otherwise wait 10 minutes before switching the dryer on again, in order to allow freon pressure

to rebalance.

4. MAINTENANCE, TROUBLESHOOTING AND DECOMMISSIONING

4.1 MAINTENANCE

Attention! Perform pressure test with inert gases only (helium, nitrogen).

Before attempting any maintenance operation, make sure that:

1. No parts of the system are under pressure.

2. No parts of the system are electrically powered.

WEEKLY OR EVERY 40 HOURS OF OPERATION

Verify the temperature on the control panel display is acceptable.

Visually check if the condensate is drained regularly.

Clean the filter mesh of the condensate drain system.

MONTHLY OR EVERY 200 HOURS OF OPERATION

Clean the condenser with compressed air, taking care not to damage the condenser fins..

At the end of the above mentioned operations, check if the dryer is working properly.

Check the condition of any filters installed with the dryer. Replace elements as needed.

YEARLY OR EVERY 2000 HOURS OF OPERATION

Check if the flexible tube used for condensate drainage is damaged and replace it if necessary.

Check if all connecting pipes are properly tightened and fixed.

At the end of the above mentioned operations, check if the dryer is working properly.

EVERY 24 MONTHS OR EVERY 4000 HOURS OF OPERATION (Mod. DD1300)

Replace the fan pressure switch.

In case of replacement of one or more components of the device, disposed it along the eventual

packaging of the replacement part, as reported in the point 4.3.

4.2 TROUBLESHOOTING

NOTE: FOLLOWING BEHAVIORS ARE NORMAL CHARACTERISTIC OF OPERATION AND NOT TROUBLES

Variable speed of the fan.

Display of message ESA and ES2 in case of operation without load or low load.

A 2 minute delay for dryer to start after pressing the on/off switch.

Troubleshooting and eventual control and/or maintenance operations must be performed by qualified

personnel.

For maintaining the refrigerating circuit of the machine, contact a refrigeration engineer.

TROUBLE

DISPLAY

POSSIBLE CAUSE

REMEDY

WATER IN THE SYSTEM

Control panel

display is

blank

No power in the line.

Restore the power in the line.

DD1300

Phases connected incorrectly.

Connect the phases correctly.

Problems with cabling.

Check cabling; if the trouble persists, replace it.

Problems with the electronic control board.

Check the electronic control board; if the trouble persists,

replace it.

The dryer is off.

Turn it on by pressing the ON/OFF switch for 1 second.

Dryer in stand-by.

Wait 2 minutes after the dryer is switched on.

Compressed air inlet/outlet inverted.

Check if the compressed air inlet/outlet is connected

properly.

The flow rate and/or temperature of the air

entering the dryer are higher than the

nominal values.

Restore the nominal conditions.

The ambient temperature is higher than the

nominal values.

Restore the nominal conditions.

The condenser is dirty.

Clean the condenser.

Condensate drain is not functioning.

Pic.3

Clean the condensate drainage system filter mesh.

Replace the coil of the drainage solenoid valve if burned.

Clean or replace the drainage solenoid valve if

clogged/jammed.

Check the C8 and C9 parameters of the electronic control

board; if the trouble persists, replace it.

The temperature control probe is positioned

improperly or faulty.

Check the probe; if the trouble persists, replace it.

DD1300

Intervention of the high pressure switch.

Reset the high pressure switch.

Problems with cabling or with the electronic

control board.

Check the cabling and the electronic control board, if the

trouble persists, replace them.

Activation of compressor’s internal thermal

protection.

Wait one hour and check again. If the fault persists: stop

dryer and call your localOMI distributor.

Problems with the electrical components of

the compressor.

Check the electrical components of the compressor.

Defective compressor.

Replace the compressor.

The flow rate and/or temperature of the air

entering the dryer are higher than the

nominal values.

Restore the nominal conditions.

The ambient temperature is higher than the

nominal values.

Restore the nominal conditions.

The condenser is dirty.

Clean the condenser.

The temperature control probe is positioned

improperly or faulty.

Check the probe; if the trouble persists, replace it.

Fan pressure switch defective or burned out

(if present).

Turn off the dryer and call your localOMI distributor.

High pressure switch defective or burned out

(if present).

Turn off the dryer and call your localOMI distributor.

Gas leakage in the refrigerating circuit.

Turn off the dryer and call your localOMI distributor.

Defective fan.

Replace the fan.

Protection fuse burned out (if present).

Replace the fuse.

TROUBLE

DISPLAY

POSSIBLE CAUSE

REMEDY

WATER IN THE

SYSTEM

The temperature control probe is

positioned improperly or faulty.

Check the probe; if the trouble persists, replace it.

Gas leakage in the refrigerating

circuit without load.

Turn off the dryer and call your localOMI distributor.

The temperature control probe is

positioned improperly or faulty.

Check the probe; if the trouble persists, replace it.

Series of alarms very close to each

other.

Call your localOMI distributor.

LOW PRESSURE IN THE LINE

Ice formation in the evaporator.

Check the probe; if the trouble persists, replace it.

Check the electronic control board; if the trouble persists,

replace it.

Contact our Service Centre to check the gas charge.

Clog.

Check if the compressed air inlet/outlet is connected properly.

Check if the connecting tubing is clogged; in case proceed

accordingly.

Check if any valves are closed.

Check the condition of any filter.

Air flows continuously through the

condensate drainage.

Drainage solenoid valve jammed, clean or replace it.

Verify the condensate drainage times set on the electronic control

board (C8 and C9).

Check the signal from the control board: if it is continuous,

replace the control board.

IMPORTANT:

The temperature control probe is extremely delicate. Do not remove the probe from its position. In case of any kind of

problem, please contact your localOMI distributor

Pic.3 drain solenoid valve

When it is necessary:

Clean the mesh filter of the

condensate drainage system.

Clean the filter mesh.

Filter mesh

Cleaning of the drain solenoid valve

4.3 DECOMMISSIONING

All work on the dryer may only be carried out by specialist personnel!

Follow this procedure if you need to shut down the dryer:

Stop the device and permanently isolate it from the electricity mains;

Disconnect the power cable;

Take pressure off the air circuit;

Empty the tank and the internal cooling medium circuits;

If the device has to be dispatched, use the original or similar packaging and keep the device in an up-right position.

Before carrying out any work on the electrical parts, make sure that the main switch interrupts the electricity supply to the

dryer and then affix appropriate warning signs to avoid the machine being reconnected to the electricity mains!

Please consult the contents and the safety instructions in the relevant sections of these instructions for details of the correct

handling and storage of the chiller. Remove any residual cooling medium from the dryer in a manner appropriate to its

properties and in accordance with the legislation in force.

If the device has to be demolished: Never open the sealed cooling assembly (compressor, evaporator and condenser) if

there may be any refrigerant or lubricating oil present!

Send the chiller to an approved waste disposal company in accordance with current environmental protection legislation.

The other materials/waste constituents must be treated in line with the provisions of the valid legislation.

5. SAFETY INFORMATION

5.1 General safety instruction

SAFETY INFORMATION

This dryer has been designed and manufactured in accordance with the European safety directive

2006/42/EU Machine Directive

2006/95/EU Low tension Directive

2004/108/EU Electromagnetical compatibility Directive

2014/68/EU PED Directive

According to PED Directive, this plant is supplied with safety devices on the frigorific circuit, calibrated according to the

under mentioned specifications.

The working life of such equipments is expected between 10 and 20 years.

Any installation, use and maintenance operations must be done according to the instructions contained in this manual and

in accordance to the national rules.

Any cleaning/maintenance operation which needs access to the dryer must be carried out by qualified and export personnel

who must be aware of all necessary precautions.

The machine has been designed and manufactured to be used in conformity to the following specifications.

In case of different use of the machine or not in conformity to this manual, the Manufacturer can’t be accused of any

responsibility.

5.2 Equipment nameplate values

(Nameplate values extracted from Calculation data sheet)

Fluid

Circuit Side

Press. Max. Amm.

Safety devices set

Work. Temp

Design Temp

MAWP

"PS" (bar rel)

(bar rel)

(°C)

Freon HFC

(R507, R407c, R134a, R404a)

Ambient 55°C

Ambient 45°C

See ATTACHMENTS

TO THIS MANUAL

C) Technical data

sheet

R134a R407c

R404a, R507

Low press. -LP

min -10°

min -15°

High Press. -HP

max +120°

High Press. WATER -HP

Compressed air

Compress. Air Side

min 0

(Customer care)

min 0°

min -15°

max. 16

max +60°

Ambient air

Ventilation side

Atm.

( Not Appl.)

min 5°

min -15°

max +55°

max. +55°

* - Safety Pressure switch Cat IV PED, Manual reset

Welding Joints Coefficient

0,7

(Table 5.6-1)

Tickness allowance

( For copper )

(Not required for surfaces in contact with freon - EN 14276-1)

( For carbon steel )

Manufacturer design code 717.0012.01.00

Essential Safety Requirements ON10.0010.09

Manufacturer Working Procedure PO 08.2

Assembly classification according 2014/68/EU See Declaration of Conformity

Evaluation Module according 2014/68/EU See Declaration of Conformity

PED Notified Body number See Declaration of Conformity

5.3 Information about remaining risks of the equipment

Fire:

This equipment, in accordance to EN-378-2, isn’t supplied with freon drain safety valve.

In case of fire it is preferable to use fire extinguishers or extinction systems basically composed of powder or foam or carbon dioxide: it is possible to

cool the equipment thanks to nebulized water.

Avoid the massive use of water because, in case of freon gas leak, the chemical reaction can cause caustic effects, even if small.

In any case it is necessary to cool down the ambient and/or the equipment’s temperature and before any intervention wait until the temperature has

been reduced.

Therefore it is preferable to insert this equipment into the Fire Prevention and Factory Safety Plan.

Arrange adequate actions capable to prevent and fight the possible risk.

Dispersion of freon gas in the ambient:

the refrigerant means is toxic only if inhaled at high concentration: it is necessary to provide an adequate ventilation in the room where the equipment

is installed.