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Operating instructions i have a 30 year old house with a carrier 4 hp ducted air cond system. is there any operating instructions i can download? on the controls it has EM/HT switch ? is that for a/c or heating? regards, ken

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The em switch is back up heat

Posted on Feb 02, 2008


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Carrier fb4bnb070


I know this thread is a little old but I thought the question has still been left unanswered. Tonnage is assumed. But, CFM and BTUs are exact.
If anybody wants to know the true size of their a/c or heating system you need to go where the engineers go.
http://www.ahrinet.org/Home.aspx

Consumers and contractors need to rethink their thinking when it comes to whole house heating and cooling... (Im from a hot humid area in the USA) Hot dry areas have other needs I won't.
ie... an air conditioner is no longer BTU's in a box. They have evolved into computers. computers that drive the blower motors, the expansion valves, the thermostat/controller can tell you the sub cooling, superheat, and the delta-t. Some tell you if the duct work is incorrect, static pressure against the blower. They are also not as forgiving if installed incorrectly.
Our industry is just catching on, but the consumer is untrustworthy when it comes to duct work and static pressure.
And in our high humidity market having high airflow with low static pressures removes far more humidity then a duct system installed over 10 years ago, Also, most homes lack proper return grille sizes, when the homeowner's desires are to put MERV 16 filters.
Here is a very useful link for duct and grille sizing.
http://efficientcomfort.net/Charts/Rules_and_Rules_of_Thumb_for_Duct_Systems.pdf


Carry on my friends,

P.S. a neat little read,

http://www.energyvanguard.com/blog-building-science-HERS-BPI/bid/55629/Why-Is-Air-Conditioner-Capacity-Measured-in-Tons

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visit this web site..this should be very similar to your remote.. http://www.abergas.co.nz/anytime/pdf_files/anytime48b23cc130447p314.pdf

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Well Steve

The fact that it was cold shouldn't make a difference if the service tech knew what he was doing. ok now as far as getting it to work correctly. before you start any work on this thing. please dear god make sure the power is off to it and you check it with a multi-meter. just recently i got lit up by 480 volt 3 phase. 3rd degree burns on my arm and hand and many other things. so please cut the power off at the braker. ok you want the wall mount in a central location about eye level or just under. the universal highth is 5'5 but its all up to you. another thing you can do is change your remote to an all electronic one. you can pick one up for as little as 15$ most are simple though some can be a pain. also make sure that both the evap coils and condenser coils are clean. ensure that all fans are working corectly and that your compressor is pumping right. unless your pretty AC savvy you will have to have a tech come back out. the bad thing about AC systems is its never just one thing. good luck hoped this helped you


Jason

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The model numbers change.You have a 3 ton system.The make and model that you replace it with is not nearly as important as a quality install.Do your homework on picking a contractor that you can trust.Have them do a load calculation to make sure a 3ton system is right for your house.13 seer is the minimum you can get.You need to weigh the projected annual savings of higher seer units against the added cost of having them installed.Again,get a contractor you trust and go with the best warranty.None were stupid questions.

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