BAC VXI 9 Operating And Maintenance Instructions Manual Download Page 19 | Manualshive

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Model

Minimum flow

(l/s)

Appr. minimum heat load

(kW)

VXI 9

3.5

7

VXI 18

3.5

15

VXI 27

3.5

20

VXI 36

3.5

30

VXI 50

5.0

45

VXI 70

7.0

60

VXI-C72

7.0

60

VXI 95

8.0

100

VXI-C108

8.0

90

VXI 144

13.0

150

VXI 145

8.0

150

VXI 180

11.0

130

VXI 190

16.0

200

VXI 215

13.0

220

VXI 288

26.0

280

VXI 290

16.0

280

VXI 360

22.0

250

VXI 430

26.0

420

Minimum requirements for water flow and heat load

W W W . B A L T I M O R E A I R C O I L . E U

19

4 Cold Weather Operations

4 Cold Weather Operations

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Summary of Contents for VXI 9

Page 1: ...VXI Closed Circuit Cooling Towers OPERATING AND MAINTENANCE INSTRUCTIONS MVXIv22EN ...

Page 2: ...gnized Codes of Practice such as EUROVENT 9 5 6 ACOP HSC L8 Guide des bonnes pratiques Legionella et tours aéroréfrigérantes etc Water sampling test results and corrective actions should be recorded in the cooling system logbook For more specific recommendations on keeping your cooling system efficient and safe contact your local BAC Balticare service provider or representative Name e mail and pho...

Page 3: ...depends on applied code of practice Notes 1 Water treatment and auxiliary equipment integrated in the cooling system may require additions to the table above Contact suppliers for recommended actions and their required frequency 2 Recommended service intervals are for typical installations Different environmental conditions may dictate more frequent servicing 3 When operating in ambient temperatur...

Page 4: ... 14 Passivation 14 Overflow connection 15 4 Cold Weather Operations 16 About cold weather operation 16 Protection against sump water freezing 16 Capacity control 16 Protection against coil freezing 17 5 Maintenance Procedure 20 Checks and adjustments 20 Inspections and corrective actions 26 Lubrication 30 Cleaning procedures 31 6 Comprehensive Maintenance 33 About comprehensive maintenance 33 Prol...

Page 5: ... Spray nozzles 6 Spray branches 7 Fan housing 8 Fan screen 9 Forward curved centrifugal fans 10 Air inlet vanes not shown 11 Fan shaft Bearings 12 Motor base adjusting screw 13 Fan motor Drive 14 Strainer 15 Adjustable float 16 Man size access door 17 Water make up valve 18 Fan discharge cowl not shown 19 Coil outlet connection 20 Coil inlet connection 21 Spray water pump VXI 1 ...

Page 6: ... for an ambient temperature range from 25 C to 40 C Design pressure max 10 bar Fluid inlet temperature max 82 C Fluid outlet temperature min 10 C Fluids circulated through the inside of the coils must be compatible with the coil construction material ie black steel for hot dip galvanized coils stainless steel AISI 304L or 316L options galvanized steel for cleanable coil option Maximum spray pressu...

Page 7: ...ystem volume per year If the annual make up of the closed system is greater than 15 yearly or if highly corrosive water such as water with very low hardness or alkalinity is used it is recommended to consider alternative stainless steel material or implement a proper water treatment program to prevent steel corrosion Stainless steel coil are available to cool corrosive fluids or water and ethylene...

Page 8: ...with extra care to prevent accidents CAUTION Do not cover units with PVC eliminators with a plastic tarpaulin Temperature increase due to sun radiation could deform the eliminators AUTHORIZED PERSONNEL The operation maintenance and repair of this equipment should be undertaken only by personnel authorized and qualified to do so All such personnel should be thoroughly familiar with the equipment th...

Page 9: ...ment of refrigerants if applicable oil and other parts must be done with respect to the environment whilst protecting workers from potential risks related to exposure to harmful substances National and regional legislation for material disposal and protection of workers should be taken into account with regard to Appropriate handling of construction and maintenance materials when dismantling the u...

Page 10: ...e event of any such defect BAC will repair or provide a replacement For more details please refer to the Limitation of Warranties applicable to and in effect at the time of the sale purchase of these products You can find these terms and conditions on the reverse side of your order acknowledgement form and your invoice W W W B A L T I M O R E A I R C O I L E U 10 ...

Page 11: ...e thereafter Moreover there must be an ongoing programme of monitoring in place to ensure the water treatment system is maintaining the water quality within the control guidelines Check and adjustments of blow down depends on the blow down device actual in use To prevent excessive build up of impurities in the circulating water a small amount of water must be bled from the system at a rate to be d...

Page 12: ...lowed provided the sum of chlorides sulfates parameters does not exceed 650 mg l for Baltibond SST304L Baltiplus protection pH 6 5 to 9 0 pH during initial passivation Below 8 2 Total hardness as CaCO3 50 to 600 mg l Total alkalinity as CaCO3 500 mg l max Total dissolved solids 1500 mg l max Conductivity 2400 µS cm Chlorides 250 mg l max Sulfates 250 mg l max Total suspended solids 25 mg l max Chl...

Page 13: ...tration of sulphates is allowed provided the sum of chlorides sulphates parameters does not exceed 650 mg l for SST304L and 1500 mg l for SST316L For Ozone water treatment application Stainless steel 316L execution is required Ozone levels are to be maintained to 0 2 ppm 0 1 ppm for at least 90 of the time with absolute maximum peaks of 0 5 ppm Cycles of concentration are the ratio of the dissolve...

Page 14: ...s which may cause corrosion Preferably the water treatment chemicals should be fed into the cooling system at the discharge of the recirculation pump The chemicals should not be fed in concentrated form nor batch fed directly into the cold water sump of the evaporative cooling equipment 3 BAC specifically discourages acid dosing as mean of scale control unless under certain strict circumstances fo...

Page 15: ... secondary approach is to conduct a chemical passivation using inorganic phosphate or film forming passivation agents Consult your water treatment specialist for specific recommendation Overflow connection A slight loss of water through the overflow on forced draft units is normal when the fans are in operation since the unit is in overpressure and some saturated air will be blown out to the unit ...

Page 16: ...h from wet to dry operation as the sump water is protected at all times For dry operation applications ensure that make up water line is shut off and make up valve completely drained Thermostats for electrical sump heaters for this equipment are set to maintain a sump water temperature of 4 C CAUTION Switch off heaters when the sump is drained Capacity control In addition to protecting the sump wa...

Page 17: ...ect the pump from running dry in case of make up failure or extreme water loss The status of the alarm can be checked prior to pump start up but should not be considered during the first minute after start up since activation of the pump can cause a water level drop that might trigger the alarm Normal make up will stabilize the water level after a short period of time In case the low level alarm s...

Page 18: ...w If the process load is extremely light or shut off it may be necessary to apply an auxiliary heat load during freezing conditions Consult your local BAC Balticare representative for advice if these conditions cannot be met Draining of the coil s is not recommended as a normal method of freeze protection unless the coil s are constructed from stainless steel or are of the cleanable type For stand...

Page 19: ...2 7 0 60 VXI 95 8 0 100 VXI C108 8 0 90 VXI 144 13 0 150 VXI 145 8 0 150 VXI 180 11 0 130 VXI 190 16 0 200 VXI 215 13 0 220 VXI 288 26 0 280 VXI 290 16 0 280 VXI 360 22 0 250 VXI 430 26 0 420 Minimum requirements for water flow and heat load W W W B A L T I M O R E A I R C O I L E U 19 4 Cold Weather Operations 4 Cold Weather Operations ...

Page 20: ...er the basin has been flushed the strainers should be removed cleaned and replaced before refilling the basin with fresh water CAUTION Do not use acid to clean the strainers Remote Basin The water level in the basin of equipment designed for remote basin operation is a function of the circulating water flow rate water outlet connection size quantity and location and outlet piping size and configur...

Page 21: ...0 430 VXI C72 VXI C108 430 VXI 180 360 460 VXI 144 215 288 430 350 Operating heights To check the operating level proceed as follows 1 Shut off fan s but keep pump s running 2 Remove circular access door next to make up connection 3 Measure height from sump bottom to water level and compare with face value from table 4 Check valve for leakage and replace valve if necessary 5 Check that float arm c...

Page 22: ...push float ball under Under normal load conditions this setting should produce the correct operating level At low load conditions the operating level will rise and needs to be adjusted The unit basin should be closely monitored and water level adjusted as necessary during the first 24 hours of operation BLOW DOWN In case of a continuous blow down with a metering valve in the bleed line ensure that...

Page 23: ...justment screw which extends through the bottom frame angle Check belt tension as follows 1 Shut off fan s 2 Rotate the fan sheave half a turn to evenly distribute the tension in the belt before measuring 3 Check belt tension by verifying both following conditions The deflection amounts 10 mm m free belt length see figure below The deflection force required is between the minimum and maximum value...

Page 24: ...ensioned re tighten the locking nuts on the motor base adjusting screws There should be no chirp or squeal when the fan motor is started DRIVE ALIGNMENT Proper drive alignment ensures maximum belt life Alignment is checked for standard drives after correct belt tensioning by placing a straight edge across both sheaves as shown in the Figure below When the drives are properly aligned the gap measur...

Page 25: ...and pumps must rotate in the correct direction which is indicated by arrows on the equipment Check proper functioning as follows 1 Stop fan s and pump s 2 Turn the fan by hand to ensure rotation without obstruction Remove obstruction if present 3 Start the pump s and check for the proper rotation as indicated by the arrow on the pump cover If rotation is wrong stop pump and correct electrical wiri...

Page 26: ... VXI 215 Fan cycling results in only on off operation For these units all fans need to operate simultaneously The following models have two upper sections and one or two fan motors per upper section VXI 288 VXI 360 VXI 430 Fan cycling results in only on off operation For these units all fans need to operate simultaneously per upper section UNUSUAL NOISE AND VIBRATIONS Unusual noise and or vibratio...

Page 27: ...agents Cleaning coils by spraying them with water may remove large deposits but do little to remove pollutants Removing dirt and salts requires a detergent to break the bond between the soil and the surface of the heat exchanger However if water spray is applied the water pressure must never exceed 2 bar and the water jet must never be applied at an angle to the surface of the fin but only in para...

Page 28: ...not applicable for coil models with standard pumps 3 Remove the eliminators 4 Check to see if the nozzles are producing the spray pattern shown in figure s below 5 Shut off pump s and clean water distribution from dirt and debris Ensure spray branches and nozzles are in place and clean Replace damaged or missing nozzles 6 Install eliminators and ensure they fit tightly with no gaps 7 Start fan s a...

Page 29: ...y for proper operation and replaced if necessary ELECTRIC WATER LEVEL CONTROL PACKAGE OPTIONAL The electric water level control package optional maintains a constant water level in the cold water sump independent of cooling load changes and water supply pressure variations Ensure every six months that all components valve float switches are operational and clean During commissioning the tower shou...

Page 30: ...s at the seal In particular when extended lubrication lines are fitted ensure that ALL old grease is removed and that new grease is leaving the seal For grease products see table below MOTOR BEARINGS Motors with frame size 200L 30kW have grease fittings l grease intervals twice a year unless otherwise shown on the nameplate of the motor l grease products see below The bearings should be lubricated...

Page 31: ... brush and soap water and install 11 Close drain and open make up supply Fill system up to overflow level with clean water DISINFECTION Disinfection of your cooling system may be needed in case of high concentration of aerobic bacteria and or Legionella Disinfection is also recommended for evaporative cooling systems with known or suspected high bacteriological levels prior to a cleaning procedure...

Page 32: ...A proper regularly monitored biocide programme reduces the need for cleaning and disinfection actions significantly W W W B A L T I M O R E A I R C O I L E U 32 ...

Page 33: ...y or an operational risk which may occur when non authorised parts are used Prolonged outdoor stay Should the unit s be stored outside prior to installation and or start up for approximately one month shelf life or longer or stored in severe climates it is imperative that certain actions be performed by the installing contractor in order to maintain the unit in as shipped condition These actions i...

Page 34: ...frigérantes Ministères de l Emploi et de la Solidarité Ministère de l Economie des Finances et de l Industrie Ministère de l Environnement Juin 2001 54p Voorkom Legionellose Minsterie van de Vlaamse Gemeenschap December 2002 77p Legionnaires Disease The Control of Legionella Bacteria in Water Systems Health Safety Commission 2000 62p Hygienische Anforderungen an raumlufttechnische Anlagen VDI 6022...

Page 35: ...W W W B A L T I M O R E A I R C O I L E U ...

Page 36: ...W W W B A L T I M O R E A I R C O I L E U ...

Page 37: ...W W W B A L T I M O R E A I R C O I L E U ...

Page 38: ...RAGE EVAPORATIVE CONDENSERS HYBRID PRODUCTS PARTS EQUIPMENTS SERVICES www BaltimoreAircoil eu info BaltimoreAircoil eu Please refer to our website for local contact details Industriepark Zone A B 2220 Heist op den Berg Belgium Baltimore Aircoil International nv ...

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