Table of Contents
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Installation,
Operation, and
Service Information
Patent Number for DHT-50 to 125:
6,691,428
Throughout this manual,
signal words are present
to advise of safety
precautions and/or
standard practices. Obey these
signal words as defined below:
DANGER! - indicates an
imminently hazardous
situation which, if not
avoided, will result in death
or serious injury.
WARNING! - indicates a
potentially hazardous
situation which, if not
avoided, could result in
death or serious injury.
CAUTION! - indicates a
potentially hazardous
situation which, if not
avoided, may result in
minor or moderate injury.
Notice: - used to address
practices not related to
personal injury.
Illustrations are for reference
only, as actual product may vary.
Installation
and Operation Manual
Aircel
High Inlet Temperature Refrigerated Air Dryer
Models DHT-20, 40, 50, 75, 100, and 125
This manual is property of the owner. Leave with the unit when set-up and
start-up are complete. Aircel LLC. reserves the right to change design and
specifications without prior notice.
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Table of Contents
Troubleshooting
Related Manuals for Aircel DHT-20
Summary of Contents for Aircel DHT-20
- Page 1 This manual is property of the owner. Leave with the unit when set-up and start-up are complete. Aircel LLC. reserves the right to change design and specifications without prior notice. Illustrations are for reference...
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Page 2: Safety Statements
Aircel DHT Series - Models 20 - 125 WARNING! General Safety Procedures • Improper installation, operation, service or maintenance may contribute to conditions in the work area or facility that could result in personal injury and product or property damage. Check that all equipment is properly selected and sized for the intended use. • Consult and comply with national and local codes relating to fire or explosion and all other appropriate codes when determining the location and operation of this equipment. -
Page 3: Table Of Contents
High Inlet Temperature Refrigerated Air Dryer Contents Safety Statements ..........2 Shut-Down Procedures ........15 Data Sheet ............. 3 Shut-Down Emergency ....... 15 Refrigerated Dryer Serial Plate Label ....4 Short-Term Shut-Down ......15 Refrigerant Safety Precautions ......5 Service Information ..........16 Design Parameters ..........6 Maintenance..........16 Description............6 Troubleshooting ..........18 System ............6 Electrical ........... 18 Refrigeration Circuit ........ -
Page 4: Refrigerated Dryer Serial Plate Label
Aircel DHT Series - Models 20 - 125 Refrigerated Dryer Serial Plate Label For Mfg Personnel: Affix Label Here if Data Sheet on pg. 3 was not completed. -
Page 5: Refrigerant Safety Precautions
High Inlet Temperature Refrigerated Air Dryer Refrigerant Safety Precautions Refrigerant First Aid Recommendations Inhalation CAUTION! If high concentrations are inhaled, immediately Inhalation, Skin, & Eye Irritant remove individual from affected area to an area with a fresh air supply. Keep individual calm. • Use proper safety and protective If not breathing, give artificial respiration or if equipment, including chemical having difficulty breathing, give oxygen and call for safety goggles or face shield and... -
Page 6: Design Parameters
Aircel DHT Series - Models 20 - 125 Design Parameters Type of dryer: Refrigerated Hot saturated air enters the air-to-air heat exchanger of the High Inlet Temperature Power supply: 115, 230 Volt / single phase / 60Hz Refrigerated Air Dryer and is precooled by the Refrigerant type: R-134A outgoing dry air. Precooling saves energy by reducing the heat load on the dryer’s compressor. Chemical Composition: HFC The cool saturated air enters the air-to-refrigerant heat exchanger where air temperature is lowered Parameter Optimum Maximum Minimum to the 48 to 50°F range. This dramatic temperature Description drop condenses water and oil. The mixture of cold air and condensation then Air Pressure... -
Page 7: Refrigeration Circuit
High Inlet Temperature Refrigerated Air Dryer Refrigeration Circuit Refrigerant is cycled through a closed loop heat exchanger, where it is pre-cooled by outgoing system commonly known as high pressure and air from the air-to-refrigerant heat exchanger. low pressure. Refrigerant is compressed by the This energy saving heat exchanger provides compressor to a gas with high temperature and several advantages, such as a reduction of the heat high pressure, which then travels to the condenser load imposed on the refrigerant compressor and (air/water cooled) to drop the temperature and condenser, providing more energy to the outlet air,... - Page 8 Aircel DHT Series - Models 20 - 125 air inlet air outlet separation cell stainless steel mist eliminator air to refrigerant incoming air heat exchanger pre-cooler / heater exiting air refrigerant refrigerant inlet refrigerant outlet Typical Schematic Flow Diagram (40 - 125 scfm rated models)
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Page 9: Purpose And Intended Use
High Inlet Temperature Refrigerated Air Dryer Purpose and Intended Use Inspection on Arrival High inlet temperature refrigerated air dryers are All high inlet temperature series dryers are tested designed for the purpose of removing moisture and operated before shipment. However, shipping from the compressed air by using mechanical vibration may cause damage such as loosening of refrigeration and providing dew points as low as certain parts. -
Page 10: Lifting Information
Aircel DHT Series - Models 20 - 125 Lifting Information Installation Codes and Procedures 1. Use all lifting points provided. Special care must be used when lifting the dryer to prevent tip- over. WARNING! 2. Use clevis connectors, not hooks, on lifting slings. • Follow proper lock out/tag out procedures before performing 3. Only lift unit under support frame/base by using service or maintenance work. -
Page 11: Installation
High Inlet Temperature Refrigerated Air Dryer Installation 1. Locate unit on a level foundation. Dryer should sized by a qualified electrician and comply with be mounted on a suitably structured flat and all applicable national and local codes. Our level floor or base that is free from vibration. company is not liable for any code violations, component damage, downtime or consequential 2. -
Page 12: Typical Installation
Aircel DHT Series - Models 20 - 125 Typical Installation Typical Installation... -
Page 13: Preliminary Start-Up Checklist
High Inlet Temperature Refrigerated Air Dryer Preliminary Start-Up Checklist Notice: For all models, wait at least 6 hours least fifteen (15) minutes to allow stabilization after transporting or moving of dryer system of the system. Verify the following: before starting the dryers. Turn the main power a. The dryer is designed to run continually switch to the dryer on, but do not turn and should not be cycling on and off with the dryer on/off switch to the on the air compressor. -
Page 14: Automatic Drain Valve Adjustments
Aircel DHT Series - Models 20 - 125 Air Cooled Condenser Requirements Cooling air must be drawn from a clean source to has been completed, the compressed air outlet reduce dust and dirt accumulation on the condenser valve on the high inlet temperature refrigerated coils. Air temperature should not exceed 100°F air dryer system can now be slowly opened to (38°C). -
Page 15: Shut-Down Procedures
High Inlet Temperature Refrigerated Air Dryer Shut-Down Procedures WARNING! • To avoid possible hazard or injury, the operator should be fully familiar with the high inlet temperature series refrigerated air dryer system and its operation. • When the system is shutdown and power removed, lock out power supply and depressurize system before performing maintenance or service work to avoid injury to personnel or property damage. -
Page 16: Service Information
Aircel DHT Series - Models 20 - 125 Service Information To reach a field service technician or for technical support, please call the number listed on the Daily manual back cover. With the dryer on-line: Maintenance • Verify the operating pressure, temperature, and Refrigerated air dryers require very little flow rate are correct and conform to those listed maintenance for satisfactory operation. Good... - Page 17 High Inlet Temperature Refrigerated Air Dryer Filter Element Replacement Hot Gas By-Pass Adjustment 1. Depressurize the air system to release Check the refrigerant suction pressure gauge for the compressed air from the air dryer. operation, if it requires adjustments perform the Notice: Shutting down the air compressor will following steps: not depressurize the air dryer unit. 1. Do not turn off the dryer. Adjust only when no Close air line valves before and after air is passing through dryer.
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Page 18: Troubleshooting
Aircel DHT Series - Models 20 - 125 Troubleshooting Electrical • Make certain that the dryer is connected WARNING! to proper power supply in accordance with electrical diagram provided. • Before any service or maintenance • Check electrical breaker/fuse disconnect to work is performed on the high inlet determine if there is electrical power to the unit. temperature series refrigerated air • A quick check should determine if the power... -
Page 19: Condensate Removal
High Inlet Temperature Refrigerated Air Dryer gas by-pass valve (or constant expansion valve) to lower refrigerant pressure to WARNING! required settings. 2. Low refrigerant readings generally indicate: Before any service or maintenance • Low ambient temperature - Provide ambient work is performed on the high inlet temperatures above 15°F. temperature series refrigerated air dryer system, disconnect power supply and • Refrigerant control setting too low - Adjust lock out power supply and depressurize hot gas by-pass valve (or constant expansion... -
Page 20: Troubleshooting Table
Aircel DHT Series - Models 20 - 125 Troubleshooting Table Problem Probable Cause Remedy Water downstream Failed or short circuited timer Replace timer drain. of dryer system or no on drain. discharge from separator/ filter. Failed drain solenoid. Replace timer drain. Bulk liquid entering the Check drains on after cooler or air compressor. - Page 21 High Inlet Temperature Refrigerated Air Dryer Problem Probable Cause Remedy Water downstream and Refrigeration compressor Check airflow (cfm) and dryer capacity. Reduce dryer system not working short cycles and cannot airflow through dryer or replace with a larger properly or not working maintain suction pressure, rated cfm dryer. (Cont). dryer undersized. Shorted fan motor Check fan motor with ohmmeter and refer to winding.
- Page 22 Aircel DHT Series - Models 20 - 125 Troubleshooting Table, continued Problem Probable Cause Remedy Low air pressure Failed or short circuited Replace timer drain. downstream due to timer on drain. continuous air flow through the moisture drain line. Failed drain solenoid. Replace timer drain. Solenoid valve stuck open. Reference the “timer drain stuck open” troubleshooting section below. Noise or vibration coming...
- Page 23 High Inlet Temperature Refrigerated Air Dryer Problem Probable Cause Remedy High Refrigeration Circuit Refrigeration condenser Clean / blow off condensing coil of dirt or Head Pressure coil fouled or dirty or air debris from the inside out. Clear area in front of (compressor is overloaded flow blocked. condensing coil of any items blocking airflow to and gauge is reading out coil.
- Page 24 Aircel DHT Series - Models 20 - 125 Compressed air The inlet compressed air temperature must be temperature to higher than 40° F. If compressed air temperature refrigeration dryer is lower than 40° F, turn refrigerated air dryer too low. off. Air may pass through the dryer under this condition, once the compressed air temperature has increased to 44°...
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Page 25: Appendix
High Inlet Temperature Refrigerated Air Dryer Appendix Refrigerant Material Safety Data Sheet MATERIAL SAFETY DATA SHEET Prepared to U.S. OSHA, CMA, ANSI and Canadian WHMIS Standards 1. PRODUCT IDENTIFICATION CHEMICAL NAME; CLASS: NON-FLAMMABLE GAS MIXTURE Containing One of the Following Components in a Nitrogen or Air Balance Gas: Dichlorodifluoromethane, 0.0005-2.0%;... - Page 26 Aircel DHT Series - Models 20 - 125 Refrigerant Material Safety Data Sheet, continued 3. HAZARD IDENTIFICATION EMERGENCY OVERVIEW: This gas mixture is a colorless, odorless gas. Releases of this gas mixture for which Nitrogen is the balance gas may produce oxygen-deficient atmospheres (especially in confined spaces or other poorly-ventilated environments); individuals in such atmospheres may be asphyxiated.
- Page 27 High Inlet Temperature Refrigerated Air Dryer 8. EXPOSURE CONTROLS - PERSONAL PROTECTION VENTILATION AND ENGINEERING CONTROLS: No special ventilation systems or engineering controls are needed under normal circumstances of use. As with all chemicals, use this gas mixture in well-ventilated areas. If this gas mixture is used in a poorly-ventilated area, install automatic monitoring equipment to detect the levels of Phosphine and Oxygen.
- Page 28 Aircel DHT Series - Models 20 - 125 Refrigerant Material Safety Data Sheet, continued 11. TOXICOLOGICAL INFORMATION 1,1,2-TRICHLORO-1,1,2- Bladder: other changes urine Biochemical: Enzyme inhibition, TRIFLUOROETHANE (continued): composition; Nutritional Gross induction, or change in blood or tissue (Inhalation-Mouse) 260 gm/m /2 hours: Metabolic: weight loss or decreased...
- Page 29 High Inlet Temperature Refrigerated Air Dryer 15. REGULATORY INFORMATION ADDITIONAL U.S. REGULATIONS: U.S. SARA REPORTING REQUIREMENTS : This gas mixture is subject to the reporting requirements of Sections 302, 304, and 313 of Title III of the Superfund Amendments and Reauthorization Act, as follows: COMPOUND SARA 302 SARA 304 SARA 313...
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Page 30: Wiring Diagram
Aircel DHT Series - Models 20 - 125 Wiring Diagram, SCFM Rated 20 to 50 Models: 1 Phase, 120 Volt, 60 Hz... - Page 31 High Inlet Temperature Refrigerated Air Dryer Wiring Diagram, SCFM Rated 75 to 100 Models: 1 Phase, 120 Volt, 60 Hz...
- Page 32 Aircel DHT Series - Models 20 - 125 Wiring Diagram, SCFM Rated 125 Model: 1 Phase, 208/230 Volt, 60 Hz...
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Page 33: Service Notes
High Inlet Temperature Refrigerated Air Dryer Service Notes Date Service Performed Notes... - Page 34 Aircel DHT Series - Models 20 - 125 Service Notes, continued Date Service Performed Notes...
- Page 35 High Inlet Temperature Refrigerated Air Dryer Service Notes, continued Date Service Performed Notes...
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Page 36: Warranty
Aircel operation and maintenance manuals are not covered under warranty. Once Aircel has been given adequate opportunity to remedy any defects in material or workmanship in accordance with Aircel Warranty Policy and Procedures, Aircel retains the sole option to accept return of the goods, with freight paid by the purchaser, and to refund the purchase price for the goods after confirming the goods are returned undamaged and in usable condition. Such a refund will be the full...
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