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

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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.

Posted on Nov 10, 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

2 Answers

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


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.

Nov 07, 2014 | Heating & Cooling

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

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

Goodman GMPH075-4 Heater with new louder noise & strange smell


The burning smell could be anything inside the furnace blower compartment. Most all the controls are located there. Me not being there is it hard to say what it it and what to replace. I would start by removing blower compartment cover and inspecting the wires and controls. Look for any bad connections. If it was transformer it would have already burnt up. Goodman has a fuse on there controlls in case of shorts, Limit controls in case of unit over heating. If you cannot visably see anything wrong it would be a good idea to call a service tech to check heat exchanger. I would have it checked anyway. James

Mar 26, 2010 | Heating & Cooling

3 Answers

Frigidair HVAC not cooling; Believe its a emergency heat problem


the switch is on your thermostat - look for something that says "system" or "Em heat, heat, off, cool" switch it to "cool" and enjoy. If that doesn't work, call a HVAC service tech. You could have bigger problems than just the system switch. Good luck

Sep 05, 2009 | Frigidaire FAS185N2 Air Conditioner

1 Answer

Need attic insulation for ladder area


Buy some styrofoam panels at the hardware store. They're usually 2"x2'X4" and they only cost a few dollars. Also get a small tube of construction adhesive. Stick them to the top side. Styrofoam if one of the best insulators you can but. I have it on the inside, of my metal basement door. In the winter, when the temperature drops to 10 °, my cellarway maintains about 65°.
!/16" thick styrofoam protesct your hand from 170° coffee.

Aug 11, 2009 | Hand Tools

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

1 Answer

There's a Frigidaire heating and cooling unit in the attic, and the thermostat is a White Rodgers (programmable). Air is blowing, but it is not HOT, though the thermostat is set at a high temperature....


Unless you have and oil fired furnace, there is not a "reset" button. Most likely, the problem will need to be investigated and addressed by a qualified service technician due to the general complexity of HVAC equipment and a plethera of different possible individual problems that could cause your issue.

Jun 19, 2008 | Heating & Cooling

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