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Right Hand Or Left Hand HVAC Coils – How Do I Choose?
HVAC coil manufacturers may overemphasize the need for left- or right-handed designation. The different reference points used can be intimidating and confusing. Often, it doesn’t matter.
You must specify one the rest Or right Steam HVAC coils by hand?
Not in general. Most steam HVAC coils are universal. Steam coils are usually 1 or 2 rows deep. This allows you to reverse the piping connection. The supply connection must be at the top and the return connection must be at the bottom. The return connection on the steam coil must be as short as possible to remove proper condensation. As long as you have the return connection shorter than the supply connection, it doesn’t matter if you have a right-handed or left-handed steam HVAC coil.
Hot water must be HVAC coils the rest Or right By hand?
Hot water and steam coils are almost identical in that both are usually only 1 or 2 rows deep. The main difference is the supply and return feed. If possible, feed the lower connection and return the upper connection. This helps remove air trapped in the HVAC coil.
Which HVAC coils necessary A ‘hand’ designation?
Cooling coils larger than 2 rows require manual designation. All coils except steam coils should be installed in counter-flow arrangement. This is especially true for HVAC coils with three rows or more. Counter-flow is the direction of air on the fins relative to the fluid in the tubes. A counter-flow arrangement will produce the most capacity. Using a chilled water cooling coil as an example, the coldest water entering the coil should be cooling the coldest air leaving the coil. See below for a more detailed explanation of counter-flow.
Detailed explanation of counter-flow:
An HVAC coil is an air to liquid heat exchanger. Air is traveling on the outside of the tube and liquid is traveling on the inside of the tube. The most important principle in designing any heat exchanger is to keep the air and fluid in a counter-flow arrangement. This means air and water travel in opposite directions through the heat exchanger. Water, refrigerant or steam always wants to enter the side of the exchanger leaving the air. This means that while air is moving from left to right, liquid is moving from right to left. All coils are tested in a counter-flow arrangement to provide maximum efficiency. When the HVAC coil is piped backwards you can lose up to 15% efficiency. This is the primary reason why deep HVAC coils are designated right- or left-handed. Counter-flow has negligible effect on 1-2 row coils.
How to refer left or right hand?
When you stand in front of the coil, the connections will be on the right or left side. This is what “hands” means. Most manufacturers specify the left and right facing airside of the HVAC coil inlet. Some manufacturers specify left and right when facing the airside entering the coil (the air hits you in the face) When facing the end of the coil with pipe stubs, the supply connection should always be at the bottom, leaving the air side and the coil return connection should always be at the top of the airside entry of the coil.
Is it the right hand to replace the coil?
When you’re replacing a chilled water coil, the connections are almost always on the bottom right and top left. Once you determine the supply and return feeds, the arm designation is not important. The HVAC coil is either bottom right/top left or bottom left/top right. The most important factor with a replacement is to match what’s there, unless you realize that the original coil was not piped in a counter-flow arrangement. This is a great situation, you can share your expertise with your customers and show them how to save money!
In summary, arm designation is not a difficult concept, but many HVAC coil manufacturers find it more difficult than necessary.
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