Breezair RPA 400 - 1500 Series Maintenance Manual - MCS

Breezair RPA 400 - 1500 SeriesMaintenance Manual

Table of ContentsITEMRegular Maintenance is essential forMaximum EfficiencyEnd of Season MaintenancePre-Season MaintenanceReplacing the Filter PadsTroubleshootingPAGE11223, 4

1REGULAR MAINTENANCE IS ESSENTIAL FORMAXIMUM EFFICIENCYTo ensure that your Breezair Evaporative Air Conditioner remains in first classworking condition for many years, it should be thoroughly serviced twice a year.A service should be performed at the end of the summer season and prior tothe commencement of the next summer season, by an authorised BreezairService Agent.HEALTH REGULATIONSPlease note that some State Regulations require that Evaporative Air Conditionersused for Commercial purposes are to be serviced at Three ( 3 ) Monthly Intervals.Owners of Commercial Air Conditioners should contact the Health Authority in theirState for servicing guidelines.LUBRICATION - ALL MODELSBearings on electric motors and water pumps are sealed for life and do not requirelubrication. The same applies to the fan shaft bearings on the RPA400-RPA900.RPA1000 - RPA1500 fan shafts are fitted with plummer blocks with grease nipples,lubricate at regular intervals, depending on frequency of use.End of Season MaintenanceTurn off the water supply.Remove cooling pad frames.Turn off the power at the isolating switch inside cabinet, or on the corner pillar.Hose both sides of the cooling pad frames to remove dust, salts pollen etc.WARNING! Do not use high water pressure when cleaning Chillcel ® pads-Damage may occur.If cooling pads are deteriorating replace as required.Check and clean the water distributor channels.Empty the water reservoir (tank) through the outlet provided.Thoroughly clean the reservoir.Do not replace the outlet. If fitted with a drain shut off valve, leave open.Ensure that water is not carrying over onto the motor.Check the fan blades are tight.Check Pulleys and Belts for wear.Check alignment and tensioning.Replace or adjust if necessary.Switch on Isolating switch and refit pad frames.

2Pre-Season MaintenanceRemove the cooling pad frames.Turn off the Isolating switch.Replace drain outlet removed at the end of the season maintenance, or close thedrain shut off valve if fitted.Turn on the water supply.Check the float valve assembly for correct operation and setting of water level.Switch on the Isolating switch.Refit the pad frames.Run air conditioner for a period of time, check pads for a uniform saturation of water.Check the bleed off rate and set using the table on page 6 as a guide.Replacing the Filter PadsIf, during your Pre-Season or End of Season maintenance you determine that thecooling pads need replacing, you will be able to purchase replacements from yourlocal Breezair Dealer.REPLACING THE PADS IS AS FOLLOWSSwitch off the air conditioner.Remove the cooling pad frames from the air conditioner by turning the black latchat the top of the pads, tilting the pad outwards and lifting.Remove the rivets from the top of the frame, lift off the top frame, the water trayand pad will lift out.Using a high pressure spray nozzle on a garden hose, wash any dirt and saltdeposits from the louvre grille and frames.Place the new pad into the frame and secure as before. When replacing pads withAspen woodwool, ensure that the woodwool is distributed evenly throughout theframe and any protruding strands are pushed back in. Particular attention shouldbe paid to the corners and edges so that air cannot bypass the pad.Spray the assembly with water to rinse any dust or loose material from the frames,then install into air conditioner.Switch the COOL control ‘ON’, and check that the trough in the upper part of thepad is filling, and allowing the water to drain through the holes in the trough.NOTE! New cooling pads can take some time to become conditioned anduniformly saturated when water is first applied. A characteristic odour ofwet timber may be experienced during this period.

3TROUBLESHOOTINGPROBLEM PROBABLE CAUSE SUGGESTED REMEDYInadequate Cooling Insufficient air discharge openings. Make sure adequate openingsInadequate exhaust for area beingare provided to exhaust thecooled, causing high humidity andincoming cool air, open windows,discomfort.doors etc.Undersized air conditioner.Clogged or dirty cooling pads.Ducts blocked or collapsedDry pads or lack of water whilethe air conditioner is operating.Excessive Ambient Humidity.See also top of page.Fan running backwards.Fan running too slow.Belt slipping.Replace with larger model.Clean or replace pads.Repair DuctsCheck water distribution systemfor obstructions. Check pump isoperating.On days during summer when theambient humidity is high, the airconditioner will not work aseffectively as on drier days. Thereis no remedy except to shut thepump off.Reconnect the incoming mainsfor correct rotation.Check motor amps. If belowrating plate specification, adjustmotor pulley to increase fan speed.Tighten belt. Replace belt if worn.Fan fails to start. Circuit breaker tripped or fuse blown. Reset or replace.Overload tripped.Power not turned ONLoose electrical connections.Faulty control switch.Motor burned out.Low supply voltage.Reset.Turn power ONCheck all connections.Replace.Replace.Consult with local Electrical authority.Motor overheats and Incorrect setting on current overloads. Reset overloads to correct setting.stops on overload.Wrong size motor.Fit correct size motor.Fan speed too high.Adjust motor pulley until the motorcurrent is equal or below thatspecified on the motor rating plate.Belt slipping or wearing Belt loose. Tighten belt.excessively.Pulleys out of line.Align pulleys.Worn belts.Worn pulleys.Replace belts.Replace pulleys.Pump fails to operate. Pump motor failure. Replace complete pump.Incorrect wiring of pump.Loose electrical connections.Pump control switch faulty.Correct pump wiring.Tighten connections.Replace pump control switch.

4TROUBLESHOOTING (Cont.)PROBLEM PROBABLE CAUSE SUGGESTED REMEDYPump runs but does not Insufficient water in tank causing Adjust float level to increase watercirculate water or pads pump to suck air. depth.lack water.Pump strainer clogged or dirty.Clean strainer.Blocked water supply tubing.Blocked water distributor at topof pad frames.Clean the tubing.Clean out the water trough.Continuous overflow of Incorrect float valve adjustment. Adjust float valve.waterInlet valve not sealingReplace valveNoisy air conditioner. Fan rubbing on housing. Reposition fan.Fan out of balance due to dirt,bent blade, etc.Air conditioner delivering more airthan required.Belt “squelching”.Belt “squealing”.Inadequate sized ducts or grilles.Loose water distribution connections.Clean fan, adjust blades ifpossible: Replace fan.Adjust any baffles or balance flowto reduce airflow.Adjust alignment of motor andpulleys.Tighten belt by adjusting motorplatform. Replace belt.Increase grille sizes.Tighten all connections.Water being thrown into Break in water distribution system. Replace any cracked or brokenthe area being cooled.tubing.Cooling pads not properly installedinto pad frames, or sagging.Old cooling pads have developed‘thin’ spots.Cooling pad fibre sticking through nettingcausing water to be sucked off pad.Too much water to pads.Ensure cooling pads are correctlyinstalled.Replace with new cooling pads.Remove any fibres protrudingthrough netting.Check Restrictor Tap setting.Unpleasant odor. Air-conditioner located near the source Relocate the Air-conditioner orof unpleasant odor.remove the odor source.New Pads fittedAlgae in tank water.Will go after short time.Drain tank and clean thoroughly, fillwith fresh water and install new pads.Pad remains wet after shutdown. Allow fan to run for a further 10minutes after pump has been shutoff.Formation of white High mineral content in water supply. Increase the bleed rate.deposits in tank andon pads.Information extracted from Booklet 601540/h.