My Cozy Heater sized and installed by professional will not heat
I have the 9,000 BTU Unit that was insatalled by American Ideal Heating & Cooling and I cannot get the room to heat to more then 57 degrees! When I went on the Cozy website, sized the room for their Vented Gas Heaters, going on the high end calculates to needing 9,856 BTU's to heat this room. The thing runs 24/7 non stop and hits a high of 57 degrees period? The installer told me based on his calculations I only needed a 5,000 btu unit, I am lost and very frustrated right now. Room measures 22' x 8' x 8' which comes to 1,408 Cubic Ft. The insulation Factor is (1) Temperature zone is (5) even though I used (7) in my calculations because it has been colder then usual. Unless I get some answers, I am to the point of seeking legal representation on this one!!
Re: My Cozy Heater sized and installed by professional...
I'm assuming your heater is the little Cozy direct vent wall furnace, your room calculations are correct, and at 57 degrees your main burner is constantly on. If so, it sounds as if you have too low a flame which can be caused by a main burner jet with an undersized orifice (like a propane one that got in the wrong assembly line) or obstructed by dirt, inadequate gas pressure, or a main gas valve that is not fully opening.
Open the pilot light inspection door and look at the main burner flame height. If it is less than 2 inches or so, check out the three possibilities above. If the flame is very yellow and wandering around lazily, check the air intake on your vent cap for obstruction.
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Last month, I had this exact same issue where my temperature was not matching the set point on my heating system. I called an HVAC specialist and had it looked at. The issue turned out to be due to the fact that I always kept the heater on, instead of just on auto. These types of malfunctions seem to happen when people continually blast their heat or AC. Kelowna Heating Air Conditioning Services
Btu's are no longer used as size measurement in air conditioners
it is now kvw
reference can be found on line but quickly
9000 btu is equal to 2.5 and 32000 btu is around 7.5
if you have a knowledgable salesman that is honest they will be able to convert the rates for you
Well if it's considered an unsafe situation, please, for your own safety, hire you own experienced expert for a second opinion. Get the results in writing, and if it shows an issue that can be resolved exists, present it to the home owner and ask for a refund off the rent. If that unit has a cracking, creaking to it, probably just the metal heat exchanger expanding and contracting. It's a new unit with new noises, and may take time to get used to. Now if its a louder bang or piping sound, there may be an intermittent issue that needs to be addressed.
First off - the 'rule of thumb' is 600' per ton of Air Conditioning. In other words your old unit is a 2 ton unit. So - 2 tons x 600' = 1200'. As you can see if you install the 2.5 ton unit - you will be installing a AC that 'could' cool a 1500 sq ft house (2.5 x 600' =1500 sq ft.). Slightly more than what you need; and the 3.5 ton unit is 'way to big,' (3.5 x 600' = 2100 sq ft.).
Note: fyi - many in the AC business will sometimes refer to tonnage in btu's, i.e. 1 ton = 12000 btu - hence a '2 ton unit' can also be referred to as a 24000 btu unit and vice versa.
So... from the above - you can easily see that "2 tons" of Air conditioning is what is required to cool the 'average' home of 1100 sq ft. "roughly speaking."
Note: it is always best to have a professional 'size' your cooling/heating needs.
One of your questions was could you 'mix tonnage?'
The answer is 'usually you don't mix the tonnage of your outside/inside units.' However, professionals sometimes do (mix the tonnage) in certain situations, and installing a 2.5 ton outside unit with an existing 2 ton inside unit is often done, however, there are some 'tech issues' here and - I would "again" recommend that you call a Service Tech to help you with the sizing/mixing of your cooling/heating needs.
The disc is doing its job, saving your life! If the heat exchanger gets too hot this disc is the safety. Find out how hot the heat exchanger is getting and what the disc is rated for. Check that there is air flowing over the heat exchanger keeping it from over heating. If your vent was installed incorrectly it could be keeping too much heat inside the furnace not allowing it to escape to the outside.