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How large does the area of the space required to service an HVAC or water heating unit in the attic have to be?

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There is no "mandatory" space requirement other enough to allow access to all areas of the unit. But, as a restoration contractor for many years, I do not recommend placing an AC or water heater in an attic. I have cleaned up many messes when an AC drain line clogged and overflowed the drain pan damaging insulation, drywall, and even flooring in the rooms below it. I also answered an emergency call one evening when an old water heater fell through a ceiling. Put these units somewhere other than the attic.

Posted on Nov 07, 2014

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There is no pat answer for that. There are many different sizes and the space requirements are usually included with the installation instructions, The seller should be able to provide the specifications to you so that you can compare different units.before you buy.

Posted on Nov 07, 2014

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Electric tank water heater is in attic. When outdoor temps are high it doesn't work. Why?


Hi Jan:
Really interesting............
A puzzle I've never encountered before.
I'm a retired Contractor and Building and Plumbing Inspector so can offer an answer based on experience.
- In hot weather, attics get REALLY hot.
- An attic is an unusual location for a hot water tank.
- A thermostat senses the temperature of the water in the tank and determines when it needs to be heated.
- I would be suspicious that in your installation, the temperature in your attic is higher than the "high limit" for your water heater.
To phrase it another way, since the attic temperature is really high, and the tank thermostat is in the attic, it "thinks" that the water is already at the required temperature.
The only real "fix" that I could suggest would be to locate the hot water tank in the moderated temperature area of the dwelling.
Hope this helps.
I would appreciate your letting me know by comment to this post if that is the problem.
Cheers, and thanks for the puzzle.

Apr 24, 2016 | Water Water Heaters

1 Answer

How large does the service area have to be in an attic for an HVAC or water heating system?


If you can get it in there and hooked up it will work . Check your local building codes, some give detailed requirements as to size and area conditions.

Nov 07, 2014 | Heating & Cooling

1 Answer

House air conditioning replacement


Since you can't buy refrigerant, without an EPA license - you're not really going to do more than install a package unit or "window shaker". 12,000 BTUs = 1Ton. The type of insulation in walls, attic floor and the type space under the lowest cooled space, window size and number all come into play. Additionally, you don't want too much A/C, because doing that will cool the space too quickly - and not remove the humidity. That will leave the area feeling uncomfortably clammy. Your pro HVAC contractor can do this for you right the first time.

May 28, 2014 | Computers & Internet

1 Answer

Does the water heater produce radiant heat to the exterior of the unit


1) No.
NO.
Do NOT store combustibles close to a water heater, fireplace, or any source of ignition, including HVAC, space heater, microwave, appliance, etc.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#bang

2) Tankless water heaters do not have FVIR safety features found in tank-type gas water heaters rated less than 60,000 BTU.

3) Tankless water heaters draw large amounts of air into combustion chamber from surrounding room, and this air feeds directly into the burner flame with no barrier.

4) If flammable vapors enter tankless, then it can cause fire, explosion, conflagration.

5) Read product manual and safe a life.

Feb 07, 2013 | Noritz N-0751M Residential Gas Tankless...

1 Answer

Had three 50-gal American Standard water heaters installed Dec. 2009 Two upstairs in attic, one downstairs at ground level. Attic location used because heaters being replaced were up there. Upstairs...


Plumber is right.
Problem is not amount of air in attic. Problem is how hot the air is.
Oxygen molecules separate apart in very hot air and pilot light goes out since there is not enough oxygen density to support combustion.
http://waterheatertimer.org/images/Water-heater-in-attic-800.jpg
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf

More ventilation is needed.
Plumber is not ventilating expert, and not responsible for attic ventilation that builder failed to install. Plumber should do a survey of location before installation to make sure gasoline vapors are not stored nearby, but summer attic ventilation is gray area until more general-public folks become aware of problem. Hotter summers temperatures will spread that information.

Hire local home center to install roof vents AND soffit vents.
Note: You also need soffit vents.
Remember a vent on the roof is like sucking air out of a coke bottle. The roof vent is no good unless air can also enter the attic from another vent located in the soffit.

Another solution is electric water heater for very hot locations.
Or install solar-assisted water heater.
http://www.hotwater.com/products/residential/cirrex_solar.html

Jul 28, 2011 | American Standard 40 G Natural Gas Water...

1 Answer

I'm just looking for a 2nd opinion on whether or not I have a bad compressor or if it is just the starter relay on a 25HNA624A300 Carrier infinity unit. Just so everyone knows I have already hired an...


First, I would not advise anyone to use water around electricity!!!, And what you are doing by hoseing down the condenser coil is transferring more heat, what it sounds like is that the unit is to small for the space you are trying to cool, rule of thumb is one ton of air (12,000 BTU) to every 450 square ft of space. So a 16000 sq ft home would require a 4 ton A/C system.
Also, the unit will work harder in the daytime , during the hottest part of the day, because there is more heat load on the unit. Check your insulation in your attic.
Some other causes of this problem are low on charge, or a leak in your system, will also get worse as your system will go flat.
A dirty condenser coil, you can turn off Electricity to unit , spray down coil w/ 409 cleaner and hose off, then turn back on, a dirty coil will stop transfer of heat and make your system work harder.
A dirty air filter will also cut down on cooling, if you can't get air into the system, you can't get it out!!
Start w/ your filter, then wash your coil (outside coil) called the condenser, again make sure power is off first!!
If you still have a problem, call a service tech, preferably not the guy who told you to water it!!
HOPE THIS HELPS!!

Jun 14, 2011 | Carrier 38BRC036 Air Conditioner

1 Answer

What is hvac


Hi, Hvac that i know is (Heating, Ventilating, and Air Conditioning) refers to technology of indoor or automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).

HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with temperature and humidity, as well as "fresh air" from outdoors.

Heating, ventilating, and air conditioning is based on inventions and discoveries made by Nikolay Lvov, Michael Faraday, Willis Carrier, Reuben Trane, James Joule, William Rankine, Sadi Carnot, and many others.

The invention of the components of HVAC systems went hand-in-hand with the industrial revolution, and new methods of modernization, higher efficiency, and system control are constantly introduced by companies and inventors all over the world. The three central functions of heating, ventilating, and air-conditioning are interrelated, providing thermal comfort, acceptable indoor air quality, within reasonable installation, operation, and maintenance costs. HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces. How air is delivered to, and removed from spaces is known as room air distribution.[1]

In modern buildings the design, installation, and control systems of these functions are integrated into one or more HVAC systems. For very small buildings, contractors normally "size" and select HVAC systems and equipment. For larger buildings, building services designers and engineers, such as mechanical, architectural, or building services engineers analyze, design, and specify the HVAC systems, and specialty mechanical contractors build and commission them. Building permits and code-compliance inspections of the installations are normally required for all sizes of buildings.[citation needed]

The HVAC industry is a worldwide enterprise, with career opportunities including operation and maintenance, system design and construction, equipment manufacturing and sales, and in education and research. The HVAC industry had been historically regulated by the manufacturers of HVAC equipment, but Regulating and Standards organizations such as HARDI, ASHRAE, SMACNA, ACCA, Uniform Mechanical Code, International Mechanical Code, and AMCA have been established to support the industry and encourage high standards and achievement.


Hope is the one your talking about.

Fill free to pass your comment...

Feb 14, 2011 | Cell Phones

1 Answer

A/c unit not cooling house weatherking model #12AJA3601


I use a spray nozzel on my water hose to clean out the oustide coil. You can go to a local Hvac parts store and get a cleaning gun and foam to clean the coil. I just use my water hose and sprayer with arm and hammer baking soda.

Jun 03, 2010 | Weather King 12AJA4201AH Air Conditioner

1 Answer

Rudd 2.5 combo ac/heat unit


This could be due to a freon leak or the condenser unit needs cleaning also the evaporator in the attic should also be cleaned and inspected. If cold sweat is not seen outside on the large line going into the outside unit I believe you may have a freon leak. Sea Breeze

Aug 27, 2009 | Ruud UAMB Air Conditioner

1 Answer

Unit makes noise, but no air is coming out of vents


check the unit in attic for iced up and outdoor unit you may notice ice on lines or connecting tubing and in attic also-------- if so turn unit off at thermostat and leave fan switch on the thermostat to on while sytem switch is off
should be nothing running but the indoor fan
will have to thaw if it is iced up for a while couple hrs. a guess
you will know when it is thawed as your airflow will begin to come back

check your air filter to be sure it is clean
suggestion only-- keep your house thermostat set at 70 degrees or above
you may have developed a refrigerant leak (freon) which would require a hvac service tech to verify.
if it was iced you can turn all back on and try again once you have good airflow again.
or if your system has not been serviced lately? might be a good time to have it serviced?

Jun 21, 2009 | Heating & Cooling

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