Lowveld Cooling and Engineering Pty Ltd blog


  • New Premises

    We will be moving into our new premises in 16 Industria Street, Industria, Polokwane as of the 1st of August 2018, please feel free to pop in and view our new site and meet our local staff.

    Lawrence

     

    Meet our local team Lawrence Isaac with Ravi at the controls. 

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  • Polokwane - Service team operating in Polokwane

    Great news as of today 23 May 2018 we have an active service team in Polokwane - for any transport refrigeration - tail lift - cold or freezer room - Solar - new equipment or repairs related queries please contact us on 072 349 6618 "24/7"

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  • We are expanding

    We are expanding, our new office will be opened soon - The count down has started

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  • Bid or Buy

    Dew to problems maintaining or online store with Bid or Buy we have decided to provisionally stop using Bid or Buy's site for sales. Our online store on our website will now carry all of our items we sell online

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  • Helpless Help Lines

    Have you lately tried to contact a corporate company for information? 

    07:30 Google the company and department required, contact details from department A to Z displayed eventually you identify the department with the closest matching description - 08:00 Phone answered by an automated system giving you options once again 1 to 6 and none of the options are relevant to your inquire - 08:30 back to the internet and you now select a different department also closely matching your requirements - 08:45 Dial the new contact number and once again the same automated message with the same options sounds off in your ear - 08:50 Select option 6 "General Inquiries" a pleasant friendly voice answers the phone rattling of the company line and T&C's 09:00 I get the chance to discus my inquiry and immediately the reaction is "WHAT" I then proceed to relay my inquiry once again with the following  "The line is breaking I can't hear you" followed by "hold on" crackly music starts playing and at 09:15 the dreaded disconnect tone starts ringing in my ears. - 09:17 redial the number go through the same sequence and eventually the new help agent says "Yes sir I know who you must talk to hold on and I will put you through to the right department" two minutes go by with the phone ringing and then the call is terminated once again - 09:40 Phone the call center again same story again however this time the help agent gives me two alternative numbers to phone, he then proceeded to put me through to the department he said would be able to assist me. No answer once again - 10:00 Phoned the alternative numbers supplied the help agent, the first number does not exist and the second just rings and rings.

    I have now tried the email route and hope to get the information required, Corporate Companies may as well do away with Call Centers.

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  • Our products are now available on Bid or Buy

    Our products are now available on Bid or Buy

    In order to give you more options we have now launched on Bid or Buy please go and look at our store here  http://www.bidorbuy.co.za/seller/1768243/LC&E_Sales 

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  • Keep equipment running efficiently - Service

    If an owner expects his refrigeration equipment to perform reliably for many years, preventive maintenance is a necessity.

    When equipment constantly breaks down or doesn’t perform to expectations, it’s often because there has never been any preventive maintenance — only emergency service. Remember, equipment is only as good as the service performed on it.

    All mechanical equipment needs periodic service to keep it in the best operating condition. Good service can mean the difference between a few mechanical malfunctions or continuous problems.

    The following is a guide to developing a comprehensive preventive maintenance program.

    To properly maintain a system, all the major components should be included in the maintenance schedule. These include the evaporator(s), compressor unit, and condenser.

    For this article, only air-cooled condensing units will be discussed. Units with water-cooled condensers or towers require specific inspection methods, but the other components of those systems can be considered within the context of this article.

    Evaporators

    Check the evaporators monthly for proper defrosting. Ice accumulation on the evaporator coil can cause inefficiencies in the operation of the system, and can be detrimental to the coil surface itself.

    Every six months:

    1. Tighten all electrical connections in the electrical panel.

    Check for frayed wiring insulation and corroded terminals, and make certain all spade connections are tight.

    2. Check fan motors and blades.

    Do the blades turn freely? Check the blades for unusual wear patterns or stress fractures. Clean the surface of each fan blade. Replace any worn blades and tighten the fan set screws.

    On motors with lubrication fittings, apply the correct lubricant. Replace any motor that is hard to rotate or has worn bearings.

    3. Check all defrost heaters.

    Make certain heaters are in the correct position for maximum heat transfer to the evaporator coil. Follow the manufacturer’s recommendations.

    Check each heater for correct amp draw.

    Check the voltage at each heater terminal.

    Make certain the heater terminals are in good condition.

    4. Clean the drain pan and check for proper drainage.

    All foreign material should be removed from the drain pan. The pan should drain freely.

    The drain line should be free-draining with visible slope away from the evaporator.

    Check the drain line heater in applications below freezing.

    5. Clean the evaporator coil surface.

    The coil should be washed periodically to remove dust and other foreign materials that might have been drawn into the fins. A commercial-grade cleaning foam can be used. Follow the label directions of the appropriate cleaner to clean refrigerant coils.

     

    Compressor Units

    Every six months:

    1. Tighten all electrical connections.

    Check for frayed wiring insulation and corroded terminals. Replace damaged wiring.

    Make certain all spade connections are tight.

    2. Check all electrical components.

    Electrical contactors should be inspected closely for worn and pitted contact points. The points should be cleaned and polished. Check for any discoloration in the conductors, which may indicate a loose wire or a dangerous overcurrent condition. Any foreign material found in the contactor should be removed.

    Inspect the defrost timer motor. Clean the contact points and lubricate the gears of the clock. Make certain the entire clock mechanism rotates freely.

    Check all relays for worn points; replace relay if necessary.

    Check the electrical connections inside the compressor electrical box.

    3. Check the operation of the control system.

    Check all pressure controls for proper operation and setpoints.

    Check the safety controls. Make certain the oil safety and high pressure controls are functioning.

    Check the operation of the room temperature thermostat. Make certain the liquid line solenoid valve closes completely and the compressor pumps down and cycles off.

    4. Check the oil level in the compressor.

    The oil level should be at or between one-third and two-thirds of the sight glass.

    Check the operation of the crankcase heater.

    5. Check the operation of the defrost controls.

    Under most conditions, the timer should initiate the defrost. Make certain the defrost termination temperature control stops the defrost cycle and allows the evaporator fans approximately 2 min of delay time before restart.

    6. Check the condition of refrigerant line insulation.

    Open, torn, or waterlogged insulation provides little benefit to the system. If the insulation is in poor condition, replace it.

    7. Check for the proper refrigerant level in the system.

    The liquid line sight glass should be clear and full of liquid refrigerant during normal operation. If not, find and repair the leak, then charge enough refrigerant into the system to maintain a clear sight glass.

    8. Check the system superheat at the condensing unit.

    Suction superheat should be checked at the compressor as follows.

    a) Measure the suction pressure at the suction service valve of the compressor and determine the saturation temperature corresponding to this pressure from a temperature-pressure chart.

    b) Measure the suction temperature of the suction line about 1 ft back from the compres-sor using an accurate ther-mometer.

    c) Subtract the saturated temperature from the actual suction line temperature. The difference is superheat.

    Too low a suction superheat can result in liquid being returned to the compressor. This causes dilution of the oil and eventual failure of the bearings, rings or, possibly, valve failure.

    Too high a suction superheat will result in excessive discharge temperatures, which cause the oil to break down and result in piston ring wear and piston and cylinder wall damage.

    For maximum system capacity, suction superheat should be kept as low as practical. (Heatcraft recommends the superheat at the compressor be no lower than 30°F.) If adjustments to the suction superheat need to be made, the expansion valve at the evaporator should be adjusted. Follow the manufacturer’s recommendations.

    9. Check all capillary and super hose lines for signs of wear.

    Make certain all capillary and super hose lines are secure and do not rub against objects that can cause refrigerant leaks.

    10. Replace all missing valve caps and unit covers.

    Condensers

    Every six months (sooner if local conditions cause clogging or fouling of air passages through the finned surface), perform the following:

    1. The condenser coil should be cleaned and washed.

    Clean periodically with a brush, vacuum cleaner, pressurized water, or commercially available coil cleaning foam. If a foam cleaner is used, it should not be acid based. Follow the label directions of the appropriate cleaner.

    2. Check the operation of the condenser fans.

    Check that each fan freely rotates.

    Tighten all fan set screws.

    Check the fan blades for signs of stress or other wear features. If any unusual wear is seen, replace the blade.

    Lubricate the motors if applicable. (Most condenser motors are permanently sealed and do not require lubricating.) Replace any motor that is worn.

    Important: Fill out a maintenance log and leave it with the owner or with the equipment after each periodic inspection. This log should be available for future reference. It is also advisable to retain a copy of the operating parameters at the time of the inspection.

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  • Why Solar

    Why Solar

    1. Solar Power Is Good for the Environment - And Us!

    The most common known benefit concerning solar power is, that it is a clean, green source of energy, that pollutes less than almost every other source of energy. Solar power doesn’t produce greenhouse gasses and it doesn’t pollute water or any other part of nature. Other than that, solar power is almost self sufficient, and only requires a little water to work.

    2. Solar Power Makes You Independent of Electricity Prices

    The price for electricity usually differs through the day, being more expensive in the middle of the day and in the early evening. Because power plants create a relatively steady output of electricity, the prices rise and fall throughout the day, based on the before mentioned change in demand. With solar power, you can avoid this rise in price, and get cheap energy all day.

    3. Solar Power Causes Use for Underutilized Land

    Most countries have a lot of land, particularly away from the big cities and capitals, which is used for nothing. With solar power, we can actually make use of this underutilized land, while we generate great value. In this way we don’t have to use spaces, that are more appropriate for other things

    4. Solar Power Causes Less Electricity Loss

    The longer energy has to be transported, the more energy is wasted on the way. If you have your source of energy on your roof, you (and the rest of us) will lose a lot less energy, than we do right now.

    5. Solar Power Improves Grid Security

    When we have a lot of people generating energy with solar power, we are less likely to experience blackouts. Each house with solar cells on it, functions as a small power plant, which provides us with a great grid security, in cause of human-caused or natural disasters.

    6. Solar Power Is Domestic

    When you use coal, oil, or natural gasses to generate your electricity, you usually make use of energy from another part of the world. If you would like to benefit your national economy, it is a good idea to use solar power, because electricity from your own solar panels are domestic.

    7. Solar Power Creates Jobs and Economic Growth

    The most of the costs towards solar power comes from the installment of solar panels and solar cells, and it is that money, that pay for other peoples salaries. The more people who choose to make use of solar power, the more people we need to install and maintain the solar panels, which helps our mutual national economy.

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