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Certification for VRF in high ambients

UAE: Eurovent Certita Certification has added high ambient temperature conditions to its certification programme for VRF air conditioning systems. 


Now, product that is tailormade for the Middle East market can be certified to display their performance in hot or very hot climatic environments.

The amended VRF certification programme certifies according to ISO 15042 and accommodates units with an outdoor unit capacity up to 100kW at 50 or 60 Hz, with up to 8 indoor units (ducted horizontal, cassette, wall mounted, ceiling suspended).

All units will be tested at T1 (35°C), T3 (46°C), and T4 (48°C), and will undergo an operability test at 52°C.

Eurovent Middle East MD Markus Lattner said the programme had been developed specifically for the region. “As a regional association, it is important to us to increase the visibility of the Middle East internationally and the understanding for the harsh environment under which we and our equipment operate. With the addition of high ambient conditions, this programme provides the market with an excellent tool to assess product performances based on region-specific testing. It even accommodates the higher requirements of Kuwait,” he said.

AirCo Pakistan | Operations and Maintenance

Maintaining VRF units of world reknown brands: Daikin, Trane, Hisense,  LG, Hitachi etc.

Revised HFC charge remains a long way from implementation

Implementing recently approved amendments to increase the hydrocarbon charge size for refrigerant allowed in cooling cabinets may take some time to be implemented in the UK, Martyn Cooper of FETA has said.

Mr Cooper has warned that despite some industry interest in adopting the new charge sizes, the process of implementing changes safely into EU and UK law would be complex and “convoluted”. However, the process is viewed as being vital to build up industry awareness and capability for the safe handling of different types of products with some level of flammability, he said.

A proposal put forward to the International Electrotechnical Commission (IEC) to increase the amount of HFCS was approved for plug-in applications this month after previously being narrowly rejected by voting members in April.

A vote by Malaysian representatives at the IEC against the revised edition of the IEC 60335-2-89 standard was ultimately rejected due to a procedural matter.

The publication of the standard is expected soon and will allow for the new charge sizes to be implemented imminently, according to the IEC. However, countries and a number of regions such as the EU will need to amend the standards to their own laws. These will then need to be passed into legislation.

Martin Cooper said that the process of safely defining new standards based on these charge limits was not something that could be rushed, even with market interest in expanding the applications for hydrocarbons in cooling.

He said, “This is going to be a very convoluted process and will take some time. Ultimately, we are talking about safety.”

Mr Cooper noted that part of the complexity of the process was ongoing industry concerns – even among some FETA members – over a number of details there were yet to be finalised over the safety aspects of any increased charge size.

A significant amount of work with stakeholders and FETA members was now needed both at EU and UK level to ensure clear standards and industry awareness was in place, he added.

The new charge size approved for hydrocarbon as defined under IEC 60335-2-89 has been increased to 500g from 150g. The increase is even higher in the case of lower flammability gas (A2Ls) – from 150g to 1.2kg. A2L charge is defined separately under the standard.

Mr Cooper said the process of approving these charge sizes was an important step to help the meet EU targets to curb reliance on higher GWP products under the F-Gas Regulation by finding viable alternatives to reduce the industry’s carbon emissions from cooling. This remained the case even with the additional work required to fully ensure safety, he added.

New era for flammables labelling

FETA noted that efforts to introduce the amended charge sizes were being introduced alongside other important changes to EU chemical labelling regulations. Mr Cooper said the changes were expected to give a more nuanced approach to detailing the level of flammability in a gas cylinder.

He said that refrigerant with both lower and higher flammability had previously used the same labelling. However, with lower flammability products being separately classed to the H-221 labelling standard, there was now a clear differentiation between the product’s lower flammability compared to the qualities of A3 gas.

Over the next year or so, Mr Cooper said he expected new cylinder labels to become noticeable on the market. The labels would reflect what he called a “spectrum of flammability” concerning the risks and safety measures needed to handle each type of gas based on its respective level of flammability

Air Conditioning Pakistan

Airconditioning in Pakistan can be challenging when it comes to finding a professional service provider. At AirCo Services Pakistan we install and maintain your units keeping international standards in consideration. Our technicians have worked in markets across the globe and with world reknown brands like Daikin, LG, Midea, Gree, Mitsubishi, Toshiba, Hisense, Haier.

We have a dedicated team for VRV units, VRF technology is complicated and requires skilled tools and workmanship to install, commission and maintain the air conditioning units. Airco Pakistan can provide complete services and is fully equipped to solve any HVAC related problems.

For complete technical, operational and maintenance solutions please send us an email on:

Our website:

Providing services across Pakistan.

Representatives in Lahore, Karachi and Islamabad.

Flammable refrigerant limits approved in recount

SWITZERLAND: In a remarkable recount, the IEC has now voted to accept a new standard which will increase the flammable refrigerant charge limit in air conditioning and refrigeration equipment.

There has been no official confirmation as yet, but it appears that Malaysia’s “no” vote on proposals to amend the 60335-2-89 standard has been ruled out as it did not follow voting procedures.

Last month, the Final Draft International Standard (FDIS) vote at the International Electrotechnical Commission (IEC) was defeated by just one vote. The nine opposing votes from the 35 nations voting, meant that the proposal could not enacted as it exceeded the maximum limit of 25%.

It was later found that Malaysia, one of those who voted against, did not include any technical justification as required by IEC directives clause 2.7.3. When this was pointed out to the IEC, Malaysia’s vote was rejected.

The amendment to the IEC 60335-2-89 standard has been in development since 2014. The long-awaited changes, if finally ratified, will see A3 refrigerant charge sizes increase to 500g and A2L refrigerants to 1.2kg.

For services: Contact Airco Pakistan, send an email to

Air Balancing: 11 Ways to Avoid Hot and Cold Spots


Air balancing will improve air circulation, increase energy efficiency and enhance the overall performance of your air conditioning and heating system. For a homeowner, it means delivering the right amount of air (hot or cold) to each room making your home more comfortable.

Air balancing for a HVAC technician is the process of testing and adjusting your system using their skill and tools of the trade. They look at your intake and output and adjust accordingly.

Rob Falke, President, National Comfort Institute — an HVAC-based training company, adds “balancing is the single-most important step that can be taken to assure your systems produce comfort and operate efficiently.”

In this article, I’ll share ways you can do-it-yourself to adjust (balance) your airflow for comfort. Then, I’ll share ways that may require a HVAC professional and I’ll help you understand how a technician will go about actually balancing a residential system.

What is Air Balancing?

Air balancing is the process that involves modifying your existing HVAC system to make sure that air is evenly distributed throughout the home. All zones will have the correct amount of heat transfer.

11 Tips on Balancing the Temperatures in Your Home

It’s time to avoid those pesky hot and cold spots and uneven temperatures.  I broke it down into easy, do-it-yourself tips, to harder may need some skill, to it’s time to contact a professional.

  1. Close or Open Your Register
  2. Try a 2 Degree Offset
  3. Check Filters for Cleanliness
  4. Install Window Coverings to Prevent Heat
  5. Avoid Placing Electronic Equipment Near Thermostat
  6. Prevent Airflow Restrictions
  7. Place Thermostat Fan Setting to “ON”
  8. Fix Your Duct Work
  9. Check and Adjust the System’s Blower Fan Speed
  10. Install Extra Return Ducts if Necessary
  11. Use Two Air Handlers

Do it yourself…

1. Close or Open Your Register

Simple yet effective. You have the ability to move the damper blade. It will restrict air flow in the room. But, don’t completely close the vents, it could cause other issues to your HVAC system.

During warm weather temperatures, open registers on your upper floor and partially close registers on first floor and / or your basement. During cold temperatures, reverse the process.

Sierra Air Conditioning put together a handy guide to get your system properly balanced for each season. Try this process first:

Step 1: Set your thermostat to 76-78 degrees. (ideal range to start testing)

Step 2: Leave the temperature alone for at least 24 hours.

Step 3: In areas that are too cool, adjust the vents to allow for less air flow.

Step 4: Adjust in small increments to feel what works for your comfort.

Step 5: Re-check your adjustments (24 hours later) to feel if you reached the desired temperature.

Step 6: Continue until you reach your ideal temperature.

2. Try a 2 Degree Offset

If you’re in a two-story home and have two thermostats, set the temperatures to have a 2 degree off-set.

Here’s what I mean…

Set the thermostat at a 2 degree difference for the floors. For example, upstairs could be set at 74 degrees and downstairs at 72. This will help with uneven temperatures.

3. Check Filters for Cleanliness

There are numerous reasons to keep your filters clean…

  • Improves your air quality – cleaning the debris that builds up on your filters will aid with the flow of air.
  • Increases the efficiency of your furnace – reduced air flow through your heating and cooling system can cause your heat exchange to overheat and shut off too quickly. Keep the filter clean and it will aid in the efficiency of your furnace.
  • Extend the life of your HVAC system – would you believe the most common reason a HVAC breaks down is due to a dirty filter? A dirty filter makes your system work harder causing it to overheat.
  • Help keep energy costs down – Heating your home uses more energy and costs more money than any other system in your home — typically making up about 42% of your utility bill. If your filter is not clogged your system will run more efficient. This alone will help keep your energy costs down. When you regularly change your filter, you can save from 5 to 15% on your bills.

4. Install Window Coverings to Prevent Heat

Your windows will impact the comfort level in each room. Windows without drapes, blinds, shades etc. can heat up a room faster before a thermostat has the time to turn on and add relief.

Window coverings can make a difference in the overall appeal and comfort level. They also can help improve energy efficiency. In cooling seasons, about 76% of sunlight that falls on standard double-pane windows enters to become heat.

5. Avoid Placing Electronic Equipment Near Thermostat

Electronic equipment creates a lot of heat and can really affect your comfort. Nowadays with the addition of large screen TV’s and computers, the distribution of heat in the room can change and may require adjustments to your vents.

This is typically noticed if you have a room air conditioner. The thermostat can pick up heat from appliances which can also cause your A/C to operate longer.

6. Prevent Airflow Restrictions

Do not cover registers with furniture or items that will restrict air flow. When you block a vent with furniture your system has to work harder. Vents are there to supply free flow of air.

Here’s a quick fix from Integrity Air:

“Your vents need 18 inches of space. Rearrange your furniture and hem your curtains so you can provide them with the air flow they need. If you have no other choice, get a magnetic air deflector so that the air blows away from the nearby furniture.”

Deflectors can redirect the air flow keeping the intended air circulation.

7. Place Thermostat Fan Setting to “ON”

Your fan setting can have an impact on your indoor air quality and comfort level. Most systems have two fan settings: On and Auto.

By utilizing the “ON” setting, the fan will blow continuously which will filter and always be replacing your indoor air. This in turn, will keep the air steady. In using the auto position, your air can become more stagnant.

Both come with pros and cons. When flipping to the On setting, you may see an increase in your utility bill.

Bonus Do-it-Yourself tips…

Watch as Dave Mars, Columbia Water & Light describes the importance of balanced air flow in a heating and cooling system.

Making sure your vents are working properly and preventing leaks in ducts will help save money and energy.

Next up: Not so do-it yourself air balancing tips…

8. Fix Your Duct Work

Fix any duct work damage and or defects. Problems with the duct work can cause uneven distribution.

If the duct air flow system is out of balance you will find that when heating, some rooms are not warm enough while others are too cool. While in air conditioning mode, you’ll find similarly that some rooms are not cool enough while others are too warm.

Depending on your skill you could:

  • fix loose duct joints by refitting and sealing the junction.
  • look for ductwork with sharp turns
  • insulate or seal the ducts

Always best to contact a HVAC professional.

9. Check and Adjust the System’s Blower Fan Speed

Switching the fan speed can be easy if you know what you are doing.

Hunker gives a step by step tutorial, “How to change air handler fan speed” from disconnecting the power to testing the unit.

The steps include…

  • disconnecting the power
  • locating the blower motor and wiring
  • identifying the speed wires
  • changing the active speed wire
  • testing your HVAC system

10. Install Extra Return Ducts if Necessary

“A second return duct can lower static pressure if the airflow bottleneck is on the return side.”

Blake Shurtz, Greiner wrote an informative article on Adding a Second Return is Almost Always a Good Idea.

11. Use Two Air Handlers

“If a single air handler is used for both heating and cooling, a basement located air handler will have an easier time pushing warm air up into higher floors of the home than it will pushing cool air up into the same spaces during the cooling season.

(Warm air rises through a building by convection while heavier cool air tends to fall).

Increased fan speed for cooling operation or booster fans may help. To avoid this problem some HVAC designs use two air handlers, placing the second unit in the attic or ceiling above the uppermost floor.”

Air balancing is a method of testing your heating and cooling system to spot any problems that are causing uneven airflow or negative air pressure. By doing this, every room in your home will be as comfortable as possible with the equipment you have.

To check the air balance, HVAC technicians will need to test your system’s performance.

“Find the tonnage or heating output to determine required system airflow. Divide the total system airflow so each room has its share. This can be done using Manual J or one of several estimating techniques, including calculating air changes.”

That’s just the start at where a HVAC expert will begin.

An air technician runs diagnostic tests on your ductwork and other systems. They run a TAB – testing, adjusting and balancing.

Some of the air flow tips are easy and can be done today.

Chemours works with Carrier on long-term refrigerant options

USA: Chemours says it is working with Carrier Transicold in Europe to adopt one of its long-term low GWP alternatives for transport refrigeration.

Carrier Transicold Europe, located in Rueil-Malmaison, France, is planning to replace R452A in transport refrigeration in 2021. Although R452A has only been offered by Carrier as a lower GWP alternative to R404A since 2015, its GWP of 2140 means it was never going to be a viable long-term solution.

Chemours Opteon XL range of refrigerants currently includes R454C (Opteon XL20) and R454A (Opteon XL40) as potential replacements for R404A. Both are “mildly flammable A2L refrigerants.

With a GWP of 146, R454C is the lowest GWP Opteon replacement for R404A and R22 in new equipment designs. It is a blend of 78.5% of the HFO R1234yf and 21.5% R32.

R454A is also made up of the same components, but with a higher proportion of R32. This is said to give it a greater overall performance and higher cooling capacity, but with a higher GWP of 238.

Chemours says it is actively engaged with Carrier Transicold Europe in working closely with regulatory and research groups to support the use of its Opteon XL refrigerants through proper equipment design and training based on applicable codes and standards. 

Stressing the importance of transport refrigeration to the viability of the global cold chain, Chemours Fluorochemicalsvice president Diego Boeri said: “As the European F-gas regulation continues to move the HVACR industry toward more environmentally sustainable solutions, it is critical to provide lower GWP options to equipment manufacturers around the world.” 

“Carrier is committed to providing efficient, sustainable solutions for its customers,” said Bertrand Gueguen, President, International Truck Trailer, Carrier Transicold. “The selection of a low-GWP refrigerant is the next logical step in the evolution of our industry,” said Bertrand Gueguen, president, international truck trailer, Carrier Transicold.

Carrier Transicold has previously stated its commitment to CO2 as the optimum refrigerant alternative for R134a in its container refrigeration units.

Bathroom Exhaust Fans: A Homeowners Guide


This guide has everything you need to know about your bathroom exhaust fans.


Types and costs.

And resources that cover everything related to bathroom fans.

In other words:

It’s a one-stop-shop for homeowners looking to understand, purchase, and install their bathroom fans. From safety to odor control, there are many reasons why having bathroom exhaust fans in your home are an essential necessity.

Continue reading “Bathroom Exhaust Fans: A Homeowners Guide”

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