Republish "Right Hand Or Left Hand HVAC Coils - How Do I Choose?"

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<h1>Right Hand Or Left Hand HVAC Coils - How Do I Choose?</h1>

HVAC Coil manufacturers can over emphasize the need to designate
left or right hand. The different reference points used can be
intimidating and confusing. Often times, it just doesn't
matter.

Do you need to specify a 
left or 
right handed steam HVAC coil?
 Not generally. Most steam HVAC coils are universal. Steam
coils are normally 1 or 2 rows deep. This allows you to reverse the
piping connections. The supply connection must be on top and the
return connection must be on the bottom. Return connections on
steam coils need to be as low as possible for proper condensation
removal. As long as you have the return connection lower than the
supply connection, it does not matter if you have a right handed or
left handed steam HVAC coil.

Do hot water HVAC coils need to be 
left or 
right handed?
 Hot water and steam coils are almost identical since both are
typically only 1 or 2 rows deep. The major difference is the supply
and return feed. If possible, feed the bottom connection and return
the top connection. This helps promote the removal of air that can
get trapped in the HVAC coil.

Which HVAC coils 
require a 'hand' designation?
 Cooling coils that are larger than 2 rows require a hand
designation. All coils except steam coils should be installed in a
counter-flow arrangement. This is particularly true for HVAC coils
with three rows or more. Counter-flow refers to the direction of
the air across 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.

A detailed explanation of counter-flow:
 A HVAC coil is an air to fluid heat exchanger. Air is
traveling on the outside of the tubes and fluid is traveling on the
inside of the tubes. The most important principle in designing any
heat exchanger is put the air and the fluid in a counter-flow
arrangement. This means that the air and water travel in opposite
directions through the heat exchanger. You always want the water,
refrigerant or steam entering on the side of the exchanger where
the air is leaving. This means that as the air goes from left to
right, the fluid is traveling from right to left. All coils are
tested in counter-flow arrangements and it provides maximum
efficiency. You can lose 15% of the capacity when a HVAC coil is
piped backwards. This is the primary reason why deeper HVAC coils
are designated as right or left hand. Counter-flow has negligible
effect on 1-2 row coils.

How to reference left or right hand?
 When you stand in front of a coil, the connections will
either be on the right or the left side. This is what they mean by
"hand" connections. Most manufacturers determine left and right
while facing the entering airside of the HVAC coil. A few
manufacturers determine left and right while facing the entering
airside of the coil (the air hitting you in the face) When facing
the end of the coil with the pipe stubs, the supply connection
should always be at the bottom, leaving air side of the coil. The
return connections should always be at the top entering air side of
the coil.

Is there a proper hand for replacement coils?
 When you are 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, hand designation is not
important. The HVAC coil is either bottom right / top left or
bottom left / top right. The most important factor with
replacements is to match what was there, unless you realize the
original coil was not piped in a counter-flow arrangement. This is
a great situation, you can share your expertise with your customer
and show them how to save money!
In summary, hand designation isn't a difficult concept, but many

<a target="_new" href="http://store.h-mac.com/hvaccoils.html">HVAC
coil</a> manufacturers make it seem more difficult than it needs to
be.

<div>Author Info 
This article was provided by H-Mac Systems, Inc. H-Mac Systems,
Inc. is the place to purchase residential, commercial and
industrial heating, ventilating, and air conditioning equipment
(HVAC Products) for your home, garage, workshop, or industrial
facility. Visit them online at 
<a target="_new" href="http://store.h-mac.com/">http://store.h-mac.com/</a>
</div>

Article Source: <a href="http://www.innoarticles.com" title="Your #1 Source For Quality Articles">InnoArticles.com</a>
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Republish "Right Hand Or Left Hand HVAC Coils - How Do I Choose?"

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