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hello

I am just learning the residential hvac trade. when new homes are built where i live, a central exhaust fan collects all stale air from house and vents it. code dictates that when the...

hello

i would like to know if someone could shoot me a schematic to allow central exhaust to work independantly from the central air unit.

i believe that when the cent exhst comes on, it...

hello;

i work in the residential industry as a service tech and i am moving into learning installations of furnaces, ac, etc.

i am looking for an easy to follow book for learning sheet metal...

HELLO

i am looking for a really good training book resource for troubleshooting furnaces and their repairs

any recommendations?

thanks

I was wondering if other than the manufacturer websites if anyone knows

if of a site that would allow me to find out product known issues for furnaces and ac. for the various brand names and...

Hello:

I was wondering if anyone can clarify for me what happens in certain situations with refrigerant for things like subcooling, superheat, and approach.

I read books etc but beyond knowing...

hello:

I have trouble picturing schematically how heat/cool anticipators work.

I know heat turns of prematurely, cool turns on prematurely, but if the resistors are loads, how does their power...

Hello:

I am an apprentice for residential hvac and was using a cd troubleshooting
simulation on my computer.

The symptom was: no cool, fan runs continuously, compressor not running

you then...

I inspect heat exchangers everyday on carrier weathermakers
wav070 etc. and I have found cracks in just about every one.
up here in Can, there is a law suit on against carrier for using substandard...

any good books on flue gas analysis or dvd or cds?

don

there are alot of old and new fan motors out there and i was wondering what is a good range for cfm for:

cooling speed, low and high fire fan speeds, as well as the continuous low speed fan for...

any schematics out there to show how this is done?

don

Hello:

I am looking for a simple wiring diagram and explanation for how a lock out relay works pertaining to refrigeration and air conditioning.

thanks in advance

don

Hello:

Is there a good reference out there such as a book or website that outlines simptoms and proceedures to check furnace motors for electrical problems?

thanks in advance

don

Residential A/C units have historically been set-up as
400 CFM per Ton.

Variable speed Norm for Humid climate is 350 CFM/ ton
( a.k.a. LOW Speed)
------------------------ Arid -------- is...

this is very helpful.

just to make sure I understand, after calculating the cfm at each tap, I can somewhat safely assume it is a correct setting if the temp rise falls within mid range of the...

Hello:


I was wondering is there a guideline for checking for cfm for the various wires representing the various speeds attainable for residential furnaces ( heating and cooling speeds)

eg:...

Hello:

I am studying split phase motors and I notice that T leads are brought out on some of these motors and some of them the leads are not.

On these fractional hp motors where the leads are...

I am a student and I was wondering if anyone could provide diagrams of how to identify the terminals on the boards of fractional hp split phase, capaciter start, etc motors

thanks

don

Hello:

I am a residential hvac apprentice currently in school for my first level, and I was just wondering what the effects of leaking suction and or discharge valves have on the low and or high...

do flame sensors rust?
what gives the difference in micro amps other than the fact that it is dirty, the length meby? what kind of reading can
you expect from a longer one than from shorter ones?

I'm looking for furnace and ac training material such as a cd or online training course for resid. furnaces and air cond. Any good ones out there you can recommend?

thanks in advance

What is the best way to test a flame sensor to deturmine if it needs replacing? Also the same on the old electronic ignition model of furnaces?

hello:

I would like to learn how to accurately size a home for central air and or furnace.

Is there an equasion or how is this done? Is it done by sq footage and also can you give other factors...

Hello:

I would appreciate it if someone could send me a link or news paper article story of a tragic accident that occured as a result of a cracked heat exchanger in a residential furnace.
...