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Table of Contents
Summary of Contents for Pahwa Group Delair RD Series
- Page 2 Foreword Welcome to the Delair family ! Thank you for opting for the Delair Dryer. This manual is dedicated to the principle that industrial machinery must be understood in order that installation and operation can proceed successfully. It assumes that the machine application is proper and that appropriate Air Dryer model has been selected.
- Page 3 INDEX S NO TOPIC Introduction 1.1 About refrigeration Dryer 1.2 Principle of operation 1.3 Controls and indicators 1.4 Safety measures Installation and commissioning 2.1 Unpacking 2.2 Inspection 2.3 Installation - types 2.4 Placing the equipment 2.5 Installation 2.6 Electric connection Operation 3.1 Start up 3.2 Switching on and off...
- Page 4 INTRODUCTION This dehumidifying Refrigeration type Compressed Air Dryer consists of the following three main components : Refrigeration system Refrigeration compressor Air cooled condenser Liquid receiver Filter Dryer Automatic expansion valve Hot gas by pass valve ( as applicable ) ...
- Page 5 1.1 About RD series Compressed Air Dryer Figure 1 will help you to identify various components of the RD series Compressed Air Dryer along with various safety and controls Figure 1...
- Page 6 Microprocessor based delsmart card – Air Cooled delair FAULTS RD Aircooled Dew Point. 4 ° HIGH PRESSURE POWER ON WATER SEPARATOR COMPRESSOR HEAT - EXCHANGER OVERLOAD AUTO DRAIN EXPANSION HOT GAS VALVE BYPASS VALVE AUTO-DRAIN FAILURE SIGHT GLASS FILTER DRYER HIGH AMBIENT SYSTEM ON/OFF...
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Page 7: Principle Of Operation
1.2 Principle of Operation Compressed air to be dried is led into the Dryer through "inlet" by means of a leak proof pipe connection. This air passes through the evaporator coil in the heat exchanger. Here the air temperature is reduced to about 4 to 6°c resulting in condensation of moisture present in the air. -
Page 8: Controls And Indicators
1.3 Controls and Indicators Below figure will help you to identify the control and indicator of the Dryer The electrical consists of : Miniature Circuit Breaker (MCB) Microprocessor based delsmart card Power Supply Card (PCB) Control contactor for comp. On/Off ... - Page 9 indicates the Dryer when High pressure fault indication compressor discharge is high condition Then high pressure switch contact are open & compressor off . Indicates the Dryer when Compressor overload fault compressor Are overheating or low indication gas condition High ambient fault indication Indicates the Dryer when ambient Temperature high from the set point Auto drain failure fault indication...
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Page 10: Safety Measures
1.4 Safety measures For your safety, the RD series Compressed Air Dryer are equipped with all necessities for safety and can be operated continuously. MCB is located in the control panel box. It is help to protect Miniature circuit breaker our Dryer unit against flow overcurrent.An Overcurrent ( MCB ) (insert MCB image) can be either an overload current or a... -
Page 11: Installation And Commissioning
2 . Installation and commissioning 2.1 Unpacking Unpack the machine carefully, remove the top and side panels of the packing case. Remove the thermocol panels from around and top of the unit. Remove mounting bolts clamping down the unit to the wooden base of the packing and gently lift the machine free from the pallet. - Page 12 2.2 Inspection during pre commissioning S. no. Particulars Check cooling water inlet temp ( deg c) and pressure ( kg/cm2) Check all the electrical and mechanical connections Check incoming power supply (220 v or 415 v ac /50 hz) Check earthing vs neutral (0 to– 1v) Check setting of phase sequence relay Check the capacity of Dryer and Compressor Check all connection of air and water supply...
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Page 13: Installation Option
2.3 Installation Option Option A - Dryer ahead of Air Receive Flow through Dryer = maximum flow of compressor Inlet temperature Dryer = outlet temperature of after cooler Option B - Dryer after Air Receiver Flow through Dryer can be more than maximum flow of Compressor Inlet temperature Dryer lower than outlet temperature of After cooler Filter installation Considerations Installation proposal with Refrigeration Dryer... -
Page 14: Placing The Equipment
2.4 Placing the equipment We recommend a minimum 600 mm of space be provided for future service and proper air ventilation. Also ensure that ambient and other inlet parameters are as per design. -
Page 15: Installation
2.5 Installation Install the machine at a level solid base taking care that front and back of the machine is having free access to the ambient air. Since the efficiency of the Dryer is directly related to the ambient temperature, air inlet temperature and air pressure. -
Page 16: Electric Connection
2.6 Electric connection Voltage option 220 volt ac, single phase, 50hz Std. 415 volt ac, three phase, 50hz + n Std. 110 volt ac, single phase, 50hz Other option 415 volt ac, three phase, 50hz w/o n Other option System operating on other voltage can be supplied on request, please check the name plate for correct voltage, number of phases and frequency Wire &... -
Page 17: Operation
3. Operation 3.1 start up Initially power on led is On. Switch On and start from the system On/Off switch. The switch itself is of illuminative type. It glows and the machine starts. The air to be dried is now opened. The digital display on mimic display is showing the inner temperature which is close to the ambient at the start. - Page 18 3.2 switching on and off: Switching on: Switch on the “System On/Off” illuminating switch. Switch glows and the machine starts. 3.2.1 3.2.2 Open the inlet of process air that requires to be dried. 3.2.3 The digital display on Microprocessor based Delsmart card is showing the inlet temperature, which is close to the ambient temperature at the beginning.
- Page 19 3.4 Safety measures & improper methods of operation This refrigeration type compressed Air Dryer is provided with many safety features for protecting both the operator and the equipment as follows: 1. Prevention of electrical shock: Supply disconnection: in order to prevent risk of an electric shock, the supply to the equipment should be disconnected before opening the equipment for service/ maintenance.
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Page 20: Maintenance
4 . Maintenance Maintenance schedule of refrigeration type Dryer Drain the condensate from the moisture separator and air receiver ( figure 4.2 ) Daily Function of compressor Weekly Working of fan Mounting bolts of the compressor, condenser and vla ( figure 4.1 ) Monthly De scaling of water cooled condenser Yearly... - Page 21 Maintenance of refrigeration Dryer (air cooled) Daily Open the manual drain valve for one second every 3 hours of working so as to check if any condensates discharge itself. Normally no condensate should discharge since it is automatically being discharged through the auto drain.
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Page 22: Troubleshooting
5. Trouble shooting Symptoms Cause Remedy Unit does a) Motor line open. a) Close start or disconnect switch. not run. b) MCB burn. b) Replace MCB c) Tripped overload. c) Turn switch off , wait 15 minutes, check for overload d) Safety controls open (low oil d) Repair or replace. - Page 23 6. Relay burned a) Low or high line voltage. a) Voltage must be within 10% of voltage listed out. on identification plate. b) Incorrect running capacitor. b) Replace with proper capacitance. c) Short cycling. c) Refer to b and c. d) Wrong relay.
- Page 24 high. Note :- exit air c) Strainer/Dryer clogged. c) Replace temperature may d) Refrigerant shortage. d) Repair leak and recharge. very due to remote e) Dirty condenser. e) Blow out with compressed air. location of sensor f) Air in system f) Check reason, recharge.
- Page 25 Annexure-i...
- Page 26 Notes Special features: _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ Remarks: ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________...
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Page 27: Contact Details
CONTACT DETAILS Regional Service Center : North East Delair India Pvt. Ltd. Delair India Pvt. Ltd. 21-C, Sector – 18, 168, Linton Street, 2nd floor Gurgaon – 122015 Kolkata – 700014 Contact : Kartik Rai Contact: D.Bhowmick Phone : 0124-4091129 / 130 Phone :033-64570568 Fax : 0124-4091100 Fax : 033- 22896834 / 22818450...