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Installation and maintenance manual
Closed circuit evaporative cooler
Axial type
Serie RAA
W-Tech S.r.l.
Via Moglio, 18/2 - 40037 Sasso Marconi - (BO) Italy
T:
F:
+39 051 6783010
+39 051 6784941
info@w-tech.it - www.w-tech.it
Reg. Imp. BO C/F - P.Iva: 03079111203 - Rea BO 490312 - Cap. Soc. 32.000 € i.v.
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Table of Contents
Summary of Contents for W.Tech RAA Series
- Page 1 Installation and maintenance manual Closed circuit evaporative cooler Axial type Serie RAA W-Tech S.r.l. Via Moglio, 18/2 - 40037 Sasso Marconi - (BO) Italy +39 051 6783010 +39 051 6784941 info@w-tech.it - www.w-tech.it Reg. Imp. BO C/F - P.Iva: 03079111203 - Rea BO 490312 - Cap. Soc. 32.000 € i.v.
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Page 3: Table Of Contents
TABLE OF CONTENTS 1. MACHINERY DESCRIPTION General safety use General description Primary Circuit. Secondary Circuit 1.4.1 Water pumping system 1.4.2 Water distribution system Air induction system Casing and water collection basin. 2. DELIVERY AND HANDLING Delivery Method 2.1.1 Lower body 2.1.2 Middle body (if any) 2.1.3... -
Page 4: Machinery Description
& maintenance. SAFETY FIRST ! General description Closed circuit cooling towers of the RAA series are counter-flow induced draught coolers with the fluid to be cooled (primary circuit) circulating in a closed sealed loop. The fluid to be cooled pass through a coil, externally sprayed continuously with water, pumped in an open circuit (secondary circuit) from the collection water basin. -
Page 5: Casing And Water Collection Basin
Casing and water collection basin The body of the unit is manufactured in “sendzimir” galvanised steel covered with 300 g/m zinc layer. As a standard, a minimum 80µ complete paint of epoxy-polyester layer is applied on each side of the panels. The application is done by electrostatic process, completed by a further one hour stop in to the oven. -
Page 6: Delivery And Handling
2. DELIVERY AND HANDLING Delivery method All models of this series are delivered with the maximum possible elements mounted in our factory. Depending on the height of parts, the unit will be divided in order to lower the transport costs. Generally the deliveries are carried out in two or more parts. To facilitate the handling operation, the single parts are laid on a wooden pallet. -
Page 7: Installation
3. INSTALLATION Tower foundation and anchoring Our units have no needs of any special foundation. They can be placed directly onto a concrete slab or onto concrete coated ground, making sure in all cases that the anchoring is capable of resisting the operating load distributed by the tower bed-frame. They can be anchored on two steel beams, all along the basin. -
Page 8: Assembly Of The Bodies
Assembly of the bodies Before beginning the assembly on site, check that all elements delivered inside the basin have been removed. To access the basin, the bolts used to capture the angle that is used to hold the louvers panels have to be eased. Then the angle is to be removed, as well as some panels. -
Page 9: Electrical Connection
The assembly could he helped by means of pointers, which will be inserted in the holes in the lower body just before the upper one is allowed to rest on it. Please see fig. 7. Fig. 7 Electrical connection Our units are normally supplied with the electrical motors already cabled and the wires are available outside of the unit minimizing the labour on site. -
Page 10: Operations To Be Carried Out Before The Start Up
4. OPERATIONS TO BE CARRIED OUT BEFORE THE START UP Cleaning • Make sure that the distribution system is clean and that the distribution nozzles are correctly positioned and free of any kind of blockage. • Check if the water basin is completely clean, if not, clean it using water under pressure. Inspection and checking •... -
Page 11: Suspended Solids
• Ryznar index = 2 pHs - pHc between 6 and 7. Where pHs is the pH of saturation and pHc is the true level measured in the circuit. • The product of sulphates and calcium concentration in the circuit water, (both expressed in mg/l Co3 Ca), should be less than 500,000. -
Page 12: General Maintenance Instructions
7. GENERAL MAINTENANCE INSTRUCTIONS Due to the quality of these units, maintenance requirements are minimal. Nevertheless, they will be inspected fully on a monthly basis. In the same way, the entire circuit should be cleaned every year. It is advisable to carry out certain actions regularly in order to ensure that you achieve the service life and performance that these units have been designed for There are two basic areas to cover: Water recirculation system... -
Page 13: Coil
Fig. 10 7.1.6 Coil The coil has to be observed regularly. It has to be considered that this is a key element in the performance of the tower. Therefore, due to the possibilities of scaling, a monthly check is recommended and a daily purge of part of the spraying water. In the air flow system The airflow system does not require any special attention, due to its strength. -
Page 14: Preventive Maintenance Summary Chart
8.- PREVENTIVE MAINTENANCE SUMMARY CHART OPERATIONS TO BE CARRIED OUT INSPECTION FOR FOULING INSPECTION OF THE GENERAL CONDITION CLEANING AND DISINFECTION BASIN WATER LEVEL INSPECTION FOR OVERHEATING, NOISE AND VIBRATION INSPECTION FOR LEAKS TIGHTENING OF BOLTS AND ANCHORING BALANCING AND ALIGNMENT LUBRICATION (please check also the instruction manual of the suppliers) BLOWDOWN FLOW AND CONCENTRATION CYCLE CHECKING D = Every Day... -
Page 15: Troubleshooting
TROUBLESHOOTING CHART DEFECT POSSIBLE CAUSE ACTION TO BE TAKEN MOTOR ROTATES IN OPPOSITE DIRECTION Error in connection. Change two phases in the power supply to the motor. ABNORMAL VIBRATION IN MECHANICAL Fan / fan motor. Check state of blades and that they are correctly secured. Clean deposits from blades, EQUIPMENT eventually verify ice formation in winter. - Page 16 W-Tech S.r.l. Direzione e Amministrazione: Via Moglio 18/2 – 40037 Sasso Marconi (BO) – ITALY +39 051 6783010 +39 051 6784941 info@w-tech.it - www.w-tech.it...