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AHT 20-350 User Maintenance Manual

Refrigerating air dryer
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AHT 20-350
USER'S MAINTENANCE AND SPARE PARTS MANUAL
- - - - EN
EN- - - -
EN
EN
Air Cooled
ISSUE 2008_06
7425MUM020
REFRIGERATING AIR DRYER
CANADA

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  • Page 1 AHT 20-350 REFRIGERATING AIR DRYER USER’S MAINTENANCE AND SPARE PARTS MANUAL - - - - EN EN- - - - Air Cooled ISSUE 2008_06 7425MUM020 CANADA...

  • Page 2: Identification Plate

    Note, these instructions are in addition to the safety rules that apply in the country where the dryer is installed. Before packing for shipment each AHT series refrigerated air dryer undergoes a rigorous test to ensure the absence of any manufacturing faults and to demonstrate that the device can perform all the functions for which it has been designed.
  • Page 3 Refrigerant Pressure Switches P 5.13 Safety thermo-switch T 5.14 DMC14 Electronic instrument (Air Dryer Controller) 5.15 Electronic level controlled condensate drain Bekomat 31 AHT 20-100 5.16 Electronic level controlled condensate drain Bekomat 32 AHT 150-350 5.17 Maintenance BEKOMAT MAINTENANCE, TROUBLESHOOTING, DISMANTLING...

  • Page 4: Definition Of The Conventional Signs Used In This Manual

    - - - - EN EN- - - - 1.1 DEFINITION OF THE CONVENTIONAL SIGNS USED IN THIS MANUAL 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.

  • Page 5: Proper Use Of The Dryer

    - - - - EN EN- - - - 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.
  • Page 6 - - - - EN EN- - - - 1.4 INSTRUCTIONS FOR THE USE OF PRESSURE EQUIPMENT ACCORDING TO PED DIRECTIVE 97/23/EC To ensure the safe operation of pressure equipments, the user must conform strictly to the above directive and the following : 1.

  • Page 7: Installation Site

    2.4 INSTALLATION LAYOUT Air compressor - A - Condensate separator Line filter (min. 20 micron) By-pass group AHT Dryer Aftercooler Pre-Filter (FTP Series - 3 micron) - B - Alu-Dry Module Compressed air tank Final filter Condensate drain In case of heavily polluted inlet air (ISO 8573.1 class 4.-.4 or worse quality), we recommend the additional...

  • Page 8: Correction Factors

    Example: Example: The procedure here is to list the operating An AHT 150 has a nominal duty of 150 scfm conditions and then to locate the corresponding (255 m /h). What is the maximum allowable flow numerical factors:...

  • Page 9: Connection To The Compressed Air System

    In order to perform maintenance operations, it recommended that a dryer by-pass system be installed as shown in the following illustration. A [in - mm] Dryer Ø [ AHT 20-50 1/2” 3 1/2“ - 90 AHT 75 1”...

  • Page 10: Electrical Connections

    - - - - EN EN- - - - 2.7 ELECTRICAL CONNECTIONS Qualified personnel should carry out connecting unit to the main power. Be sure to check the local codes in your area. Before connecting the unit to the electrical supply, verify the identification plate for the proper electrical information.

  • Page 11: First Start-Up

    - - - - EN EN- - - - 3.2 FIRST START-UP This procedure should be followed on first start-up, after periods of extended shutdown or following maintenance procedures. Qualified personnel must perform the start-up. Sequence of operations (refer to paragraph 5.1 Control Panel) : •...
  • Page 12 - - - - EN EN- - - - 4.1 TECHNICAL SPECIFICATIONS AHT 20-150 -1 (115/1/60)
  • Page 13 - - - - EN EN- - - - 4.2 TECHNICAL SPECIFICATIONS AHT 20-350 -2 (230/1/60)

  • Page 14: Control Panel

    - - - - EN EN- - - - 5.1 CONTROL PANEL The control panel illustrated below is the only dryer-operator interface. AHT 20 - 75 DMC14 AHT 100 - 350 DMC 14 °C °F Main switch Air and refrigerating gas flow diagram Electronic control instrument DMC14 5.2 OPERATION...

  • Page 15: Flow Diagram (Air-Cooled)

    Bekomat drainer Refrigerant Fan pressure-switch P … Refrigerating compressor Aftercooler Hot Gas By-pass Valve Aftercooler fan (AHT 75-350) Condenser (Air-Cooled) Pre-Filter (3 micron) Compressed air flow direction Refrigerating gas flow direction 5.4 REFRIGERATING COMPRESSOR The refrigerating compressor is the pump in the system, gas coming from the evaporator (low pressure side) is compressed up to the condensation pressure (high pressure side).

  • Page 16: Filter Drier

    The cooling operation occurs via a high efficiency axial ventilator which, in applying pressure on the air contained within the dryer, forces it into the blades package. In models AHT 20-50 the aftercooler is combined with the dryer’s condenser, thus forming just one heat exchanger battery, cooled by just one high efficiency axial fan.

  • Page 17: Hot Gas By-Pass Valve

    - - - - EN EN- - - - 5.11 HOT GAS BY-PASS VALVE This valve injects part of the hot gas (taken from the discharge side of the compressor) in the pipe between the evaporator and the suction side of the compressor, keeping the evaporation temperature/pressure constant at approx. 36° F (+2 ° C). This injection prevents the formation of ice inside the dryer evaporator at every load condition.

  • Page 18: Set-Up (Programming)

    - - - - EN EN- - - - 5.14 DMC14 ELECTRONIC INSTRUMENT (AIR DRYER CONTROLLER) Button - access the set-up. DMC 14 Button - Exit programming / decrease value. °C °F Button - Value increment. - Dryer in alarm status. ●...
  • Page 19 ATTENTION! These BEKOMAT condensate drains have been specially designed for the use in a refrigerant dryer AHT. Any Installation in other compressed air treatment units or the exchange against a different drain brand may lead to malfunction. Do not exceed the max. operating pressure (see type plate)! MAKE SURE WHEN THE DRYER STARTS THE UPSTREAM VALVE IS OPEN.
  • Page 20 ATTENTION! These BEKOMAT condensate drains have been specially designed for the use in a refrigerant dryer AHT. Any installation in other compressed air treatment units or the exchange against a different drain brand may lead to malfunction. Do not exceed the max. operating pressure (see type plate)! MAKE SURE WHEN THE DRYER STARTS THE UPSTREAM VALVE IS OPEN.
  • Page 21 - - - - EN EN- - - - MEMBRANE FUNCTION OF BEKOMAT 32 AHT 150-350 TROUBLESHOOTING BEKOMAT 32 AHT150-350 The detection of defects should be carried out by qualified personnel. SYMPTOM POSSIBLE CAUSE - SUGGESTED ACTION Power-LED no Check for mains failure.
  • Page 22 (1) (type description, color of snap-fit). Reassemble the BEKOMAT with the new Service-Unit (4) in reverse order. BEKOMAT REPLACEMENT PARTS BEKOMAT 31 BEKOMAT 32 Description AHT 20-100 AHT 150-350 Service Unit XE KA31 101 XE KA32 101 Set of seals XE KA31 002...

  • Page 23: Controls And Maintenance

    - - - - EN EN- - - - 6.1 CONTROLS AND MAINTENANCE Only qualified personnel should perform troubleshooting and or maintenance operations. Prior to performing any maintenance or service, be sure that: • no part of the machine is powered and that it cannot be connected to the mains supply. •...

  • Page 24: Troubleshooting

    There is a leak in the refrigerating fluid circuit - contact a refrigeration engineer. If the fan still doesn't work, replace it. AHT 75-350- The Verify the electric wiring. Aftercooler fan If the fan still doesn't work, replace it.
  • Page 25 - - - - EN EN- - - - DewPoint too low. The fan is always ON - P pressure switch is faulty - replace it. The Hot Gas By-pass Valve is out of setting - contact a refrigeration engineer to restore the nominal setting.

  • Page 26: Dismantling Of The Dryer

    - - - - EN EN- - - - 6.3 MAINTENANCE OPERATION ON THE REFRIGERATING CIRCUIT Maintenance and service on refrigerating systems must be carried out only by certified refrigerating engineers only, according to local rules. All the refrigerant of the system must be recovered for its recycling, reclamation or destruction. DO NOT DISPOSE THE REFRIGERANT FLUID IN THE ENVIROMENT.

  • Page 27: Dryers Dimensions

    7.1.4 AHT 200-250 /AC Dryers Dimensions 7.1.5 AHT 300-350 /AC Dryers Dimensions 7.2 EXPLODED VIEW 7.2.1 Exploded view of Dryers AHT 20-50 7.2.2 Exploded view of Dryers AHT 75 7.2.3 Exploded view of Dryers AHT 100 7.2.4 Exploded view of Dryers AHT 150 7.2.5...

  • Page 28: Electric Diagrams

    PR : Temperature probe (DewPoint) PV : Pressure switch - Fan control PA : Pressure switch (high-pressure) - Compressor discharge side (AHT 300-350) PB : Pressure switch (low-pressure) - Compressor suction side (AHT 300-350) TS : Safety thermo switch (AHT 125-350)
  • Page 29 7.1.1 AHT 20-50 / AC 7.1.2 AHT 75 / AC 7.1.3 AHT 100-150 / AC...
  • Page 30 7.1.4 AHT 200-250 / AC 7.1.5 AHT 300-350 / AC...
  • Page 31 7.2.1 AHT 20-50...
  • Page 32 7.2.2 AHT 75...
  • Page 33 7.2.3 AHT 100...
  • Page 34 7.2.4 AHT 150...
  • Page 35 7.2.5 AHT 200-250...
  • Page 36 7.2.6 AHT 300-350...
  • Page 37 7.3.1 AHT 20-50 -1 (115/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA 7.3.2 AHT 20-50 -2 (230/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA...
  • Page 38 7.3.3 AHT 75-100 -1 (115/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA 7.3.4 AHT 75-100 -2 (230/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA...
  • Page 39 7.3.5 AHT 150 -1 (115/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA 7.3.6 AHT 150-250 -2 (230/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA...
  • Page 40 7.3.7 AHT 300-350 -2 (230/1/60) Air Dryer Controller 11 12 DEW-POINT ALARM max 250V 1A min 5VDC 10mA...
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  • Page 44 GRAMAGLIA (GO)

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