Installation and Operation Manual Installation, Operation, and Service Information Aircel High Inlet Temperature Refrigerated Air Dryer Models DHT-20, 40, 50, 75, 100, and 125 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.
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.
High Inlet Temperature Refrigerated Air Dryer Contents Safety Statements................................................... 2 Data Sheet.............................................................. 3 Refrigerated Dryer Serial Plate Label..................... 4 Refrigerant Safety Precautions............................... 5 Design Parameters.................................................. 6 Description............................................................ 6 System...................................
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.
High Inlet Temperature Refrigerated Air Dryer Refrigerant Safety Precautions Refrigerant First Aid Recommendations CAUTION! Inhalation, Skin, & Eye Irritant • Use proper safety and protective equipment, including chemical safety goggles or face shield and impervious gloves when handling refrigerants. • Exercise care to ensure that liquid refrigerant does not come in contact with your skin or eyes. • DO NOT SMOKE.
Aircel DHT Series - Models 20 - 125 Design Parameters Type of dryer: Refrigerated Power supply: 115, 230 Volt / single phase / 60Hz Refrigerant type: R-134A Chemical Composition: HFC Parameter Description Air Pressure (PSIG) Air Inlet Temperature (°F) Ambient Temperature (°F) Suction Gauge Reading (psig) Discharge Gauge Reading (psig) Evaporator Temperature (°F) Optimum Maximum Minimum 150-175 200 80 100-180 200 40 75 100 32 28-40 60 28 160-250 350 80 38-42 60 33 Description System A br
High Inlet Temperature Refrigerated Air Dryer Refrigeration Circuit Refrigerant is cycled through a closed loop system commonly known as high pressure and low pressure. Refrigerant is compressed by the compressor to a gas with high temperature and high pressure, which then travels to the condenser (air/water cooled) to drop the temperature and change from gas to liquid.
Aircel DHT Series - Models 20 - 125 air inlet air outlet separation cell stainless steel mist eliminator air to refrigerant heat exchanger incoming air pre-cooler / heater exiting air air refrigerant inlet refrigerant refrigerant outlet Typical Schematic Flow Diagram (40 - 125 scfm rated models) 8
High Inlet Temperature Refrigerated Air Dryer Purpose and Intended Use Inspection on Arrival High inlet temperature refrigerated air dryers are designed for the purpose of removing moisture from the compressed air by using mechanical refrigeration and providing dew points as low as (48° F- 50° F). These dryers are used to protect industrial compressed air systems, machinery, and tools.
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 tipover. WARNING! 2. Use clevis connectors, not hooks, on lifting slings. • 3. Only lift unit under support frame/base by using the fork lift openings provided. Do not lift by piping. Follow proper lock out/tag out procedures before performing service or maintenance work.
High Inlet Temperature Refrigerated Air Dryer Installation 1. Locate unit on a level foundation. Dryer should be mounted on a suitably structured flat and level floor or base that is free from vibration. 2. Install unit to provide adequate clearance for maintenance services. Dryer and accompanying filters (optional) should be installed with at least 2 to 5 feet clearance from the adjoining walls to provide easy access for routine maintenance and adequate air flow across the condensing coil. 3.
Aircel DHT Series - Models 20 - 125 Typical Installation Typical Installation 12
High Inlet Temperature Refrigerated Air Dryer Preliminary Start-Up Checklist Notice: For all models, wait at least 6 hours after transporting or moving of dryer system before starting the dryers. Turn the main power switch to the dryer on, but do not turn the dryer on/off switch to the on position until 6 hours have passed. The power indicating light will be on. 1. Check that the inlet and outlet connections are the correct size and pressure rating, and tightened securely. 2.
Aircel DHT Series - Models 20 - 125 Air Cooled Condenser Requirements has been completed, the compressed air outlet valve on the high inlet temperature refrigerated air dryer system can now be slowly opened to supply clean dry compressed air to the facility. 10. After start-up and approximately one month of service, check that all piping and fittings are tight and free of leaks. Notices: • Models with the hot gas by-pass valves and expansion valves are preset at the factory for the desired dew point.
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.
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 manual back cover. Daily Maintenance With the dryer on-line: Refrigerated air dryers require very little maintenance for satisfactory operation. Good performance can be expected if the following routine maintenance steps are taken.
High Inlet Temperature Refrigerated Air Dryer Filter Element Replacement Hot Gas By-Pass Adjustment 1. Depressurize the air system to release the compressed air from the air dryer. Notice: Shutting down the air compressor will not depressurize the air dryer unit. Close air line valves before and after dryer and then depressurize unit. Depressurize dryer by pushing the test button on the dryer system drain until there is no more pressure in the dryer system.
Aircel DHT Series - Models 20 - 125 Troubleshooting Electrical WARNING! • • • Before any service or maintenance work is performed on the high inlet temperature series refrigerated air dryer system, disconnect power supply and lock out power supply and depressurize system before performing maintenance or service work. • Make certain that the dryer is connected to proper power supply in accordance with electrical diagram provided.
High Inlet Temperature Refrigerated Air Dryer gas by-pass valve (or constant expansion valve) to lower refrigerant pressure to required settings. WARNING! 2. Low refrigerant readings generally indicate: Before any service or maintenance work is performed on the high inlet temperature series refrigerated air dryer system, disconnect power supply and lock out power supply and depressurize system before performing maintenance or service work.
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 dryer from upstream. Check drains on after cooler or air compressor. Inlet compressed air Check inlet air temperature and adjust to meet temperature to dryer too specifications of dryer system.
High Inlet Temperature Refrigerated Air Dryer Problem Probable Cause Water downstream and Refrigeration compressor dryer system not working short cycles and cannot properly or not working maintain suction pressure, (Cont). dryer undersized. Low air pressure downstream or high pressure drop across the dryer system. Notice: To confirm freeze-up, shut system off for 20 min and allow to thaw. Air pressure in line should come back to normal pressure. Remedy Check airflow (cfm) and dryer capacity.
Aircel DHT Series - Models 20 - 125 Troubleshooting Table, continued Problem Probable Cause Low air pressure Failed or short circuited downstream due to timer on drain. continuous air flow through the moisture drain line. 22 Replace timer drain. Failed drain solenoid. Replace timer drain. Solenoid valve stuck open. Reference the “timer drain stuck open” troubleshooting section below. Noise or vibration coming System dropped during from refrigerated air dryer shipping causing system.
High Inlet Temperature Refrigerated Air Dryer Problem Probable Cause High Refrigeration Circuit Refrigeration condenser Head Pressure coil fouled or dirty or air (compressor is overloaded flow blocked. and gauge is reading out of recommended pressure range). Condenser fan motor not working properly or faulty. Low Refrigeration Circuit Head Pressure (gauge is reading out of recommended pressure range). Remedy Clean / blow off condensing coil of dirt or debris from the inside out.
Aircel DHT Series - Models 20 - 125 Compressed air temperature to refrigeration dryer too low. The inlet compressed air temperature must be higher than 40° F. If compressed air temperature is lower than 40° F, turn refrigerated air dryer off. Air may pass through the dryer under this condition, once the compressed air temperature has increased to 44° F the dryer must be turned back on to avoid a high refrigerant pressure situation or isolate the dryer from the compressed air stream.
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%; Trichlorofluoromethane, 0.0005-2.0%; 1,1,2-Trichloro-1,1,2-trifluoroethane, 0.0005-2.0%; Tetrafluoroethane, 0.0005-2.
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.
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.
Aircel DHT Series - Models 20 - 125 Refrigerant Material Safety Data Sheet, continued 1,1,2-TRICHLORO-1,1,2TRIFLUOROETHANE (continued): LC50 (Inhalation-Mouse) 260 gm/m3/2 hours: Behavioral: somnolence (general depressed activity), ataxia; Lungs, Thorax, or Respiration: cyanosis LC50 (Inhalation-Rabbit) 59,500 ppm/2 hours: Sense Organs and Special Senses (Eye): effect, not otherwise specified; Behavioral: excitement; Lungs, Thorax, or Respiration: respiratory stimulation LC50 (Inhalation-Guinea Pig) >12 pp
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: SARA 302 (40 CFR 355, Appendix A) SARA 304 (40 CFR Table 302.4) SARA 313 (40 CFR 372.
Aircel DHT Series - Models 20 - 125 Wiring Diagram, SCFM Rated 20 to 50 Models: 1 Phase, 120 Volt, 60 Hz 30
High Inlet Temperature Refrigerated Air Dryer Wiring Diagram, SCFM Rated 75 to 100 Models: 1 Phase, 120 Volt, 60 Hz 31
Aircel DHT Series - Models 20 - 125 Wiring Diagram, SCFM Rated 125 Model: 1 Phase, 208/230 Volt, 60 Hz 32
High Inlet Temperature Refrigerated Air Dryer Service Notes Date Service Performed Notes 33
Aircel DHT Series - Models 20 - 125 Service Notes, continued Date 34 Service Performed Notes
High Inlet Temperature Refrigerated Air Dryer Service Notes, continued Date Service Performed Notes 35
Aircel Compressed Air & Gas Warranty Aircel warrants that its Standard Refrigerated Air Dryers are free from defects in materials and workmanship for two years from the date of invoice. Warranty coverage for this time period will be parts and labor for the first year and parts only for the second. Custom engineered products, desiccant dryers, chillers and nitrogen generators are warranted to be free from defects in materials and workmanship for one year from date of invoice.
