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BAC VXC Series, Operating And Maintenance Instructions Manual, Page: 23 / 34

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BAC VXC Series Operating And Maintenance Instructions Manual Download Page 23

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 wiring.

4. Start the fan(s) and check for proper rotation as indicated by the arrow on the fan housing. If rotation is wrong

stop fan(s) and contact BAC.

Forward curved centrifugal fan

MOTOR VOLTAGE AND CURRENT

Check the voltage and the current of all three legs of the fan and pump motors. The current should not exceed the

nameplate rating. After prolonged shut-down (or motor is stored with unit in kit form) the motor insulation should be

checked with a Megger insulation tester prior to restarting.
1. Insulation resistance test – minimum value should be 1 Mega Ohm (1.000.000 Ohms).
2. Thermistors, if fitted, should be checked for continuity with a multi-meter but never Megger-tested.
3. Ensure supply voltage and frequency correspond to the motor nameplate rating.
4. Ensure shaft turns freely.
5. Wire the motor in accordance with the wiring diagram as shown on the motor nameplate and/or in the motor

terminal box.

6. Turn on unit and check amp draw does not exceed nameplate rating.

If motor is stored, it should be in a clean, dry place & have the shaft rotated occasionally. Storage areas

should not be subject to vibration.

CAUTION

Rapid on-off cycling can cause the fan motor to overheat.

It is recommended that controls be set to allow a maximum of 6 on/off cycles per hour.
The following models have only one upper section and one or two fan motors:

-

VXC 357-454, VXC 495-516, VXC 562-680, VXC 715-804

-

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:

-

VXC 714-908, VXC 990-1032, VXC 1124-1360, VXC 1430-1608

-

Fan cycling results in only on-off operation.

-

For these units, all fans need to operate simultaneously per upper section.

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

23

5 Maintenance Procedure

5 Maintenance Procedure

Summary of Contents for VXC Series

Page 1: ...VXC Evaporative Condensers OPERATING AND MAINTENANCE INSTRUCTIONS MVXCv22EN ...

Page 2: ...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 phone numb...

Page 3: ...ry 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 temperatures below freezing the unit should be inspected more frequently see Cold...

Page 4: ...hemical treatment 13 Passivation 13 Overflow connection 14 4 Cold Weather Operations 15 About cold weather operation 15 Protection against sump water freezing 15 Capacity control 15 5 Maintenance Procedure 17 Checks and adjustments 17 Inspections and corrective actions 24 Lubrication 26 Cleaning procedures 27 6 Comprehensive Maintenance 29 About comprehensive maintenance 29 Prolonged outdoor stay ...

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 VXC 1 ...

Page 6: ...r semi hermetic compressors The installer must take the necessary precautions on site to safeguard the operation of these components in conjunction with the condenser coils Maximum spray pressure 14 kPa If pump s are installed by others it is recommended to install a pressure gauge at the inlet of the water distribution system At ambient temperatures above 40 C ensure spray water pump remains runn...

Page 7: ...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 the associated systems and controls and the procedures set forth in thi...

Page 8: ... of the unit and treatment 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 ...

Page 9: ...efect 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 9 2 General information 2 General information ...

Page 10: ...ust 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 determined by the water treatm...

Page 11: ...d 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 Chlorination as ...

Page 12: ...Higher concentration 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...

Page 13: ...ause 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 for open circui...

Page 14: ...H below 8 2 a 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...

Page 15: ...sump installations are best suited for a flexible switch 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...

Page 16: ...ith a time delay of maximum 30 seconds after switching off the fan s and should be activated maximum 30 seconds prior to the anticipated start of the fan s The purpose of a low level cut out switch for pump protection is to protect 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 du...

Page 17: ...t the sediment from re entering the unit system After 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 quanti...

Page 18: ...ment are indicated in the tables below Model Operating height measured from pan bottom mm VXC 14 through 135 340 VXC 150 through 205 420 VXC 221 through 265 430 VXC S288 through S1010 430 VXC C220 through C426 460 VXC 357 through 454 460 VXC 562 through 714 460 VXC 798 908 1124 through 1360 460 VXC 495 516 715 772 350 VXC 804 990 1032 350 VXC 1430 through 1608 350 W W W B A L T I M O R E A I R C O...

Page 19: ...n a threaded rod held in place by wing nuts see figure below Water make up valve assembly 1 Float ball 2 Float arm assembly 3 Float valve CAUTION Supply pressure for mechanical make up valves should be between 1 and 3 5 bar To make the initial basin water level setting fill the sump with water until 2 cm above operating level Adjust the wing nuts of the float ball so that the make up valve is comp...

Page 20: ... levels which are favourable to bacteriological growth Ensure every six months the heater thermostat is properly set and clean Also ensure that control and safety devices such as low level cut out switches are operational clean and properly incorporated into the control circuit CAUTION Sump heaters can be hot BELT TENSIONING Belt tensioning can be adjusted by changing the position of the fan motor...

Page 21: ... If belt tensioning is required please proceed as follows 1 Loosen the lock nuts on the motor base adjusting screws 2 Turn the motor base adjusting screws clockwise to tension the belt or counter clockwise to relieve belt tension During adjustment of belt tension the drives should be rotated several times by hand to evenly distribute the tension throughout the belt 3 When the belt is properly tens...

Page 22: ...ing collars can be set using the following procedure See figure below 1 Stop fan s and remove side access panel s 2 Loosen the set screw 3 Using a drift pin centre punch tap the collar in the hole provided tangentially in the direction of rotation while holding the shaft 4 Re tighten the screw 5 Close unit access door and start pump s and fan s Locking collar assembly 1 Direction of rotation 2 Dri...

Page 23: ...e and frequency correspond to the motor nameplate rating 4 Ensure shaft turns freely 5 Wire the motor in accordance with the wiring diagram as shown on the motor nameplate and or in the motor terminal box 6 Turn on unit and check amp draw does not exceed nameplate rating If motor is stored it should be in a clean dry place have the shaft rotated occasionally Storage areas should not be subject to ...

Page 24: ...g piping should be drained flushed and cleaned of slimes and other organic contamination Refill system with water and apply biocide shock treatment Check pH value and functionality of ongoing biocide treatment HEAT TRANSFER SECTION The inspection procedure is as follows 1 Shut off fan s and pump s 2 Remove the eliminators and access doors 3 Inspect the coil for obstructions damages corrosion fouli...

Page 25: ...ightly with no gaps 7 Start fan s and pump s Nozzle spray distribution type FAN SHAFT The exposed areas of the fan shaft are coated with a soft seal for added corrosion protection It is recommended that the coating be inspected for continuity quarterly or at least every 6 months Any signs of surface corrosion must be treated This involves 1 Removal of the protective coating with a suitable cleanin...

Page 26: ...wise it will not function correctly Lubrication FAN SHAFT BEARINGS The fan shaft is supported by ball bearings see figure below Under normal operating conditions the bearings should be greased every 2000 operating hours or at least every six months The bearings should be lubricated with one of the following water resistant inhibited greases or an equivalent which are good for ambient temperature r...

Page 27: ...od quality corrosion inhibiting grease such as one of those recommended for lubricating the fan shaft bearings Adjustable motor base 1 Motor base slides 2 Adjusting screw Cleaning procedures MECHANICAL CLEANING Keeping your evaporative cooling equipment and the associated system clean will maintain its efficiency and help to prevent uncontrolled bacteriological growth The recommended cleaning proc...

Page 28: ...rations or when significant alterations have been made to the cooling system Disinfection must be carried out in accordance with a proper procedure and take into account the safety of the cleaning and disinfection staff Typically disinfection is achieved using a sodium hyper chloride solution to maintain a residual value of 5 15 mg l of free chlorine and circulate this around the system for up to ...

Page 29: ... efficiency 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...

Page 30: ...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 31: ...W W W B A L T I M O R E A I R C O I L E U ...

Page 32: ...W W W B A L T I M O R E A I R C O I L E U ...

Page 33: ...W W W B A L T I M O R E A I R C O I L E U ...

Page 34: ...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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