dh

domnick hunter

COMPRESSED AIR DRYERS

PERSLUCHTDROGERS ● DRUCKLUFTTROCKNER
SÉCHEURS D’AIR COMPRIMÉ ● PAINEILMAKUIVAIMET
TRYCKLUFTSTORKARE ● LUFTTØRKERE FOR KOMPRIMERT LUFT
TRYKLUFTTØRREANLÆG ● ΞHPANTHPEΣ ΠEΠIEΣMENOY AEPA
SECADORES DE AIRE COMPRIMIDO ● SECADORES DE AR COMPRIMIDO
ESSICCATORI PER ARIA COMPRESSA

Instruction Manual
Handleiding ● Bedienungsanleitung ● Manuel op ratoire ● K ytt opas
Bruksanvisning ● Instruksjonsh ndbok ● Brugsvejledning ● Eγχειρίδιο χειρισµού
Manual de instrucciones ● Manual de Instru es ● Manuale di istruzioni

GB NL D F SU SV NO DK HE ES PO IT
English 1
Nederlands 15
Deutsch 29
Français 43
Suomi 57
Svenska 71
Norsk 85
Dansk 99
Eλληνιxά 113
Español 127
Português 141
Italiani 155
WARNING!

Do not operate the dryer until the instructions in this manual have been read and understood by
all personnel concerned.

When handling, installing or operating, personnel must employ safe engineering practices and observe all
related regulations, health and safety procedures, and legal requirements for safety.

Most accidents that occur during the operation and maintenance of machinery are the result of failure to
observe basic safety rules and procedures. Accidents can be avoided by recognising that any machinery
is potentially hazardous.

domnick hunter can not anticipate every possible circumstance which may represent a potential hazard.

The WARNINGS in this manual cover the most known potential hazards, but by definition cannot be all
inclusive. If the dryer user employs an operating procedure, item of equipment or a method of working
which is not specifically recommended by domnick hunter the user must ensure that the dryer will not
be damaged or made a potential hazard to persons or property.

IMPORTANT

Caution: Power
Risk of Electric Shock

Attention

PLEASE NOTE THAT YOUR WARRANTY MAY BE INVALIDATED IF THE EQUIPMENT HAS NOT
BEEN INSTALLED, COMMISSIONED AND MAINTAINED BY domnick hunter OR A domnick hunter
APPROVED AGENT.

1
INDEX

1.0 Introduction 3

2.0 Installation 4

3.0 Start-up and Operation 9

4.0 Maintenance 11

5.0 Spare Parts 12

6.0 Troubleshooting 13

2
INTRODUCTION

The PNEUDRI MiDAS range of compressed air dryers are designed to remove
moisture from compressed air by utilising state of the art technology to obtain
dewpoints of -40°C PDP and by appropriate de-rating -70°C PDP.

PNEUDRI MiDAS dryers have been designed to require minimal maintenance and
can be installed virtually anywhere.

The PNEUDRI MiDAS dryer consists of upper and lower head assemblies joined
together with an aluminium extrusion containing twin internal chambers. The upper
head assembly contains inlet and outlet manifolds, pre-filter and autodrain. The lower
head assembly contains two exhaust valves and a passive shuttle ball valve.
Contained in each internal chamber is a combination desiccant / after-filter cartridge.
During operation one chamber is on-line (drying) while the other is regenerating, using
the Pressure Swing Adsorption (PSA) process.

Pressure Swing Adsorption (PSA)

A small percentage of dried air is taken from the dryer outlet flow and is used to
regenerate the saturated chamber by expanding the dried air from line pressure to
atmospheric pressure. During this process, the moisture is physically removed from
the regenerating chamber and vented to atmosphere through the exhaust.

3
2.0 INSTALLATION (refer to figure 1)

2.1 ESSENTIAL INFORMATION

Care must be taken to ensure that the dryer is not subject to flows (even peaks) in
excess of the dryers rated capacity, e.g. dryers downstream of an air receiver have
increased potential to be overflowed.

The dryer can be installed free standing, secured to the floor via the fastening points
provided in the base or secured to a wall using optional brackets.

The control enclosure (A) must be at the bottom and the dryer must be installed
vertical and level.

Two inlet and two outlet connections are available at the top of the dryer to enable
connection from either left or right. Unused connections (B) and (C) must be sealed
with the threaded plugs provided. Suitable rated pipe and connections must be used
for the installation. All pipework must be secure and safely positioned.

The purge flow is factory set for 6 bar g (87 psi g) minimum operating pressure.
Should the minimum pressure requirement be different, the purge flow must be reset
by a domnick hunter engineer or a domnick hunter approved agent.

Ensure the dryer is electrically connected to a supply suitable for the unit. See wiring
diagram printed in 2.3 Electrical Details.

1. Filtration
A 0.01 micron pre-filter is contained within the upper head assembly. 1 micron after-
filters are integral within desiccant cartridges screwed into inserts in the upper head
assembly. Filters must be maintained by domnick hunter or a domnick hunter
approved agent.

2. By-pass Line (D)

A by-pass line, 3/8" BSP or NPT * (D) ensures complete safety during maintenance
and enables a continuous supply of compressed air to be maintained if required. It
should be remembered that air bypassing the dryer is dirty untreated air.

3. Valves (E, F, G)
Isolation valves, 3/8" BSP or NPT * are recommended on the inlet (E), outlet (F) and
bypass (G) lines at the positions indicated in Figure 1.

* When ordering, the thread type must be specified.

4
2.2 TECHNICAL SPECIFICATION

Operating Specification

Parameter Minimum Maximum Nominal

Inlet Pressure 4.0 bar g (58 psi g) 12.0 bar g (175 psi g) 7.0 bar g (102 psi g)

Parameter Minimum Maximum Nom inal

Inlet Temperature 1.5˚C (35˚F) 50˚C (122˚F) 35˚C (95˚F)

Electrical Specification

Dryer Model Voltage Supply Supply Need Electrical Approval

50 Hz 230 V 1 phase CE
60 Hz 115V 1 phase CSA/UL

General Specification

Inlet Flowrate
DAS 1 3 cfm 5.1 m3/hr
DAS 2 5 cfm 8.5 m3/hr
DAS 3 8 cfm 13.6 m3/hr
DAS 4 10 cfm 17.0 m3/hr
DAS 5 13cfm 22.1 m3/hr
DAS 6 15 cfm 25.5 m3/hr
DAS 7 20 cfm 34.0 m3/hr

Outlet Dewpoint -40 ˚C (-40˚F) Optional –70˚C (-100˚F)

Environmental Protection IP65 (NEMA4)
Noise Level <70 dB(A)
Dryer Weights
DAS 1 11 Kgs 24.3 lbs
DAS 2 13 Kgs 28.7 lbs
DAS 3 16 Kgs 35.3 lbs
DAS 4 18 Kgs 39.7 lbs
DAS 5 20 Kgs 44.1 lbs
DAS 6 23 Kgs 50.7 lbs
DAS 7 28 Kgs 61.7 lbs

Note: All flow rates referenced at 20˚C (68˚F) , 7 bar g (102 psi g)

5
2.3 ELECTRICAL DETAILS

Only competent qualified electricians must work on dryer circuitry.

Check the rating plate for power supply requirements.

Correct isolator switches must be provided at a safe and accessible point near to the
dryer.

The dryer must be provided with a live, neutral and earth ground.

Connect power to the dryer (via the mains cable gland *) at the fused terminal block
mounted on the small base plate located under the enclosure. Four screws retain the
base plate.

A T500mA fuse is fitted as standard.

230V,50/60Hz
230V, 50Hz
115V,
115V, 60HzHz
50/60

T500mA
Brown Live
Earth ground

Blue Neutral

*For CSA / NPT dryers, the cable gland is replaced by a conduit entry aperture.

6
2.4 INSTALLATION PROPOSAL

Figure 1
H

Orange Red
! Orange
✓ Green

3/8”BSP or NPT

KEY
(A) Control Box (E) Inlet Valve
(B) Optional Inlet (F) Outlet Valve
(C) Optional Outlet (G) By-pass Valve
(D) By-pass Line (H) Display Unit

7
2.5 RUNNING THE DRYER WITH A MINIMUM PRESSURE ABOVE 7 BAR

If the dryer is to be run with a minimum pressure of 7 Bar g (102psig) an alteration to

the timer board is required.

To carry out the alteration,ensure the electrical supply is isolated, lie the dryer on its
back, to gain access to the control base. Remove the large plate to gain access to the
timer board. Move electric jumper from Position 1 to Position 2, as shown.

Position 1
Dryers running below
7 Bar g (102psig)

Position 2
Dryers running above
7 Bar g (102psig)

8
2.5 ACCESSORIES

Remote Alarm Display kit

Part Number: DASRDK

Wall Mounting Bracket Kit

Option 1 Option 2
Part Number: DASMB1 Part Number: DASMB2

9
3.0 START-UP AND OPERATION
3.1 INTIAL STARTUP

Ensure a suitable supply of compressed air between 4 bar g (58 psi g) and 12 bar g
(175 psi g) pressure is available and check that the dryer cannot be overflowed. Inlet
temperature must be between 1.5°C (35°F) to 50°C (122°F) at all times.

IMPORTANT NOTE
Ensure all valves are opened and closed gradually.

Proceed as follows: (Refer to figure 1)

3.2 WITHOUT THE BY-PASS LINE (D)

Close inlet (E) and outlet (F) valves.

Introduce air to the dryer by gradually turning the inlet valve (E) until fully open.

Allow dryer to fully pressurise, then gradually open the outlet valve (F).

Switch on the electrical isolator, the yellow ‘power on’ LED and the green ‘correct
operation’ LED will illuminate and the dryer will commence cycling. The dryer is now
on stream.

3.3 USING THE BY-PASS LINE (D)

With the inlet (E) and outlet (F) valves closed and the by-pass (G) valve open,
introduce air to the dryer by gradually turning inlet valve (E) until fully open.

Allow the dryer to fully pressurise, then open the outlet valve (F) while simultaneously
closing the by-pass valve (G).

Switch on the electrical isolator, the yellow ‘power on’ LED and the green ‘correct
operation’ LED will illuminate and the dryer will commence cycling. The dryer is now
on stream.

3.4 NORMAL OPERATION

Following the start-up procedure the operation of the dryer is fully automatic and
requires no further attention until shut down.
The yellow ‘power on’ LED and the green ‘correct operation’ LED should be illuminated
continuously.

Power On
* !
✓ * Correct Operation

10
The dryer contains two desiccant chambers, while one chamber is drying the
compressed air (adsorption), the other chamber is simultaneously undergoing
regeneration (desorption). At a predetermined time both exhaust valves close and
repressurisation begins. Every three minutes the chambers are reversed in function,
this is the changeover point. Changeover is characterised by an immediate venting of
compressed air from the chamber entering regeneration.
The dryer can be shut down at any point in its cycle and when restarted will enter an
automatic repressurisation stage. After repressurisation the cycle will commence at
the point at which it stopped.

NB
If power is switched on, the dryer will enter an automatic repressurisation stage at the
point at which it stopped.

3.5 SHUT-DOWN PROCEDURE

To Depressurize the Dryer

Prior to isolating the electrical supply close the outlet valve (F) while simultaneously
opening the by-pass valve (G) if fitted. Close the inlet valve (E). The dryer will now be
isolated from mains pressure. Cycle the dryer for a minimum of 3 minutes to ensure
the dryer vents and is completely depressurized. When the dryer is completely
depressurized, isolate the electrical supply.

NB
The by-pass valve (G) should only be opened if the dryer is undergoing maintenance.

11
4.0 MAINTENANCE

Daily
• Ensure the yellow ‘power on’ LED and the green ‘correct operation’ LED are
illuminated.

Weekly
• Check dryer seals, fittings and pipe work for air leaks.
• Ensure correct operation of inlet filtration condensate drainage.

The Combination desiccant / after-filter cartridges have a finite life dependent upon
operating conditions.
Cartridge status is indicated

Power On
* !
✓
* Cartridge Wear

Cartridges will require changing in 500 hours.

! *
Power On
* Service Required

Cartridges require changing and audible alarm will sound every 6 seconds.

NOTE: Temporary resetting of the alarm to prevent nuisance noise is possible after
alarm has sounded for the first time. This is done by depressing once the reset button
located inside the control enclosure, accessed by removing the black insert on the
side. The alarm will be muted for a 24 hour interval until the dryer has been serviced
and the reset sequence completed.

Servicing of the dryer must only be carried out by domnick hunter personnel or trained
domnick hunter service agents.

12
5.0 SPARE PARTS LIST

Genuine domnick hunter Service kits must only be used when servicing the dryer.

Dryer Model Spares Kit Part Numbers

DAS 1 DASMK1
DAS 2 DASMK2
DAS 3 DASMK3
DAS 4 DASMK4
DAS 5 DASMK5
DAS 6 DASMK6
DAS 7 DASMK7

X2

13
6.0 TROUBLESHOOTING
Problem Indication Probable Cause Remedy

Poor Dewpoint N/A Entrained Water Check pre-filtration and pre-filtration drains

Excessive air flow demand Check actual flow against rated flow of dryer
Check for recent additions to air system

Inlet pressure too low Check against technical specification

Excessive inlet air Check against technical specification

temperature

Insufficient purge air flow Factory set for 6 barg (87 psi g) system pressure

Exhaust silencers blocked Change by domnick hunter trained personnel

Contaminated desiccant Eliminate source of contamination. Desiccant

change by domnick hunter trained personnel

Cartridges not fitted Check and fit cartridges

Electrical Fault Power LED ‘OFF’ Hardware fault Contact domnick hunter customer service

Failure to purge No depressurisation Purge valve blocked or shut domnick hunter trained personnel to adjust
and poor dewpoint Exhaust silencer blocked Change by domnick hunter trained personnel

Outlet air flow Downstream No air supply to the Check compressor air supply to dryer
stops pressure drops dryer Check all pipework and fittings for leaks

Constant Erratic air flow from Damaged valve Change by domnick hunter trained personnel
depressurisation exhaust

Reference to Known Misuse

Filters
• Opening inlet valve too quickly, causing initial high differential pressure across
filter element.

Inlet / outlet head

• Pipe diameter too small
• Pipework unsupported
• Inlet pipework taken from low point of manifold range allowing bulk water
intrusion into the dryer.

Electric control box

• Incorrect wiring configuration by user or incorrect supply voltage.
• No fuse fitted or fuse blown.

Additional items
• Use of non-recommended components.
• Untrained, unauthorised maintenance / installation personnel used.
• Subsequent increase in air consumption without relation to dryer flow capacity.
• Purging of pneumatic system and dryer with cleaning agents that have the
potential to damage desiccant material.
• Covers removed or loose during operation.
• Cartridges and filter / autodrain not changed when red LED is illuminated.
LED failure.

14
 DECLARATION OF CONFORMITY
98/37/EC (1992 - SI3073)
GB
Name of manufacturer or supplier:
domnick hunter ltd.

Full postal address including country of origin

Dukesway, TVTE, Gateshead, Tyne & Wear
England

Place of issue : Gateshead

Description of product : DESICCANT AIR DRYER

Name, type or model, batch or serial number

DAS 1, DAS 2, DAS 3, DAS 4 - Complies with Article 3: section 3.3 of 97/23/EC
DAS 5, DAS 6, DAS7 - Module A of 97/23/EC

Directives used
98/37/EC, 89/336/EEC, 73/23/EEC, 93/68/EEC, 92/31/EEC, 97/23/EC (as above)
Standards used, including number, title, issue date and other related documents
Generally in accordance with ASMEVIII div 1 : 1995
up to and including 1996 addenda
EN292-1:1991 & EN292-2:1991, EN50081-2:1994, EN50081-1:1992, EN50082-1:1998 &
EN50082-2:1995, EN61010-1:1993.

Name of authorised representitive

A.Bishop

Position of authorised representitive

Quality Manager - Industrial

Full postal address if different from above

AS ABOVE

Declaration
I declare that as the authorised representitive, the above information in relation to the supply /
manufacture of this product, is in conformity with the standards and other related documents
following the provisions of the above Directives

Signature of authorised representitive

15