"Compatible Thermostat " , posted Tue 16 Aug 13:50

I have a Carrier Premium Non-Programmable thermostat. I'm pretty sure that it is 1 stage cooling and 2 stage heating. Will a P474-1050 Totaline programmable thermostat work in it's place? I really ... read more

dmiles2000

"Air temp " , posted Tue 16 Aug 11:41

Hello,I was wondering what the air temp difference across the indoor coil should be, is there a "rule of thumb" to use for a guide?The unit I have istalled is a 1.5 ton, the pressures ... read more

Mr Freeze

"tonnage " , posted Tue 16 Aug 11:19

have system 3.5 for compressor 5 for air handler. have been told so many things from so few companies, don't know what to do. have been told i need 5 ton comp and 5 ton handler for 2600 sq home, ft. m ... read more

ynotc100

"need wiring help " , posted Mon 15 Aug 20:43

I am trying to update my old Janitrol HPT18-60 to a programmable Honeywell T8112. It was wired Y-yellow, G-green, R-red, O-orange, W2-white, E-black, C-blue and there was a tan wire folded behind the ... read more

DiV

"new HVAC install " , posted Mon 15 Aug 20:22:

i need to compare this units Carrier: 38 TZA 036 vs 38 ETG 036 vs 38 TSA 036 outdoor condensing unit 3 ton ,what is the SEER, and which is better. I want this Carrier furnace 58 MVP100, ... read more

GYURI

"Need expert suggestion of new HVAC install " , posted Mon 15 Aug 20:13

Hi I want to install in 50 yr old home single story ranch , with half finish basmenet 1500 sqft+500 sq.ft basmnt . new HVAC system with new sheetmetal ductwork.The old system is radiant wate ... read more

GYURI

"have central heat want a/c added " , posted Mon 15 Aug 15:56

Have a cape cod style home, it has forced air heat but no a/c. Saw a trane 5 ton 2 yr old for sale on a demolition house, (owner - who is an a/c man - building new/better on same site)dem ... read more

camille

"drum noise " , posted Mon 15 Aug 12:21

For the past 2 months I hear a drum type of noise on a set interval (2-3 seconds) from my home air conditioning system. The A/C works just fine and blows cool air. The unit is only 2 years old. Any id ... read more

mmirheyd

"Installation Instructions " , posted Mon 15 Aug 10:49

I have had a HVAC Company (Oliver Heating and Cooling) poorly installed the following items in my home.They came out, spiked the job, and have not been paid a dime.When I complained about the ... read more

Taken4aRide

"help me please " , posted Sun 14 Aug 23:37

i live in a mobile home i have a coleman evcon furnace but do not know what ac unit whyen i turn either on a alarm sounds and saying its my atticc fan where do i look for this ? Or is it something ... read more

1dakota1

"New unit, compressor, or fan " , posted Sun 14 Aug 18:00

Here is my situation now. I have a 7 year old 3 ton 10 seer Rheem unit with 80% gas backup furnace. last year I had several people out checking the freon because of icing. The all said the same thing ... read more

mwhite

"RHEEM Classic IX Icing Problems " , posted Sun 14 Aug 13:18

I have had my heatpump's outside unit serviced once already this summer with icing problems where I would not get any cold air but the outside unit had ice on the pipes. The service guy said all it ne ... read more

dmb560

"409A -> R12 ? " , posted Sun 14 Aug 09:12

I replaced R12 with 409A in refrigerations, so what about AC unit? Could that be possible? ... read more

beginner

"6 wire comfortmaker to honeywell CT3200A " , posted Sat 13 Aug 21:29

I need help wiring a new thermostat in my house. I got a Honeywell CT3200A to replace an old 6 wire Comfortmaker t-stat, but the new one doesn't wire up the same. W1=White ... read more

hammerhead78

"Need Help Please: Compressor Cutting Out " , posted Sat 13 Aug 12:43

Glad I found the site. Searched for answers, decided to post a question. I'll try to be as specific as possible.Tempstar "5000" series dual zone heat pumps circa 1995. The upstairs unit is ... read more

jocko

"steam heating system " , posted Sat 13 Aug 07:51

What cause banging noise in a steam heating system? Is it the most upper floor valve is not openning up at the radiator? Or is it the water is stuck in the piping somewhere? I haven't have a chance ... read more

beginner

"Replacing BAYSTAT239 with Climatouch C3 " , posted Fri 12 Aug 19:31

Hello all !I am replacing a Trane BAYSTAT239 thermostat with a Climatouch C3 which I just purchased. The unit outside is a Trane High Efficiency XE 800. Based on other entires I have reviewe ... read more

lhanna

"ok everyone-lets not all chime in at once... " , posted Fri 12 Aug 13:12

any thoughts on where someone might find this piece of artwork? The one on the panel is faded so bad its isnt ledgeable. Any information will be appreciated as Carrier's site is useless. ... read more

blind electrici

"Lennox outdoor blower fan locked up " , posted Fri 12 Aug 12:26

Hi, I was wondering if I could get an estimate of repair cost for a locked up outdoor unit blower fan motor on a Lennox Model #10ACB30-9P. The unit is only 7 years old and all the outdoor unit ... read more

fyrmnk

"Carrier A/C " , posted Fri 12 Aug 10:51

Need wiring schematic for Carrier 50dg006300 a/c unit. ... read more

blind electrici

"why does the evaporator pressure drop " , posted Fri 12 Aug 09:44:

I cannot seem to get my head around what causes the evaporator pressure to drop as the air which is being cooled also drops.I thought that the system was designed to have a set pressure in the Eva ... read more

jhammond601

"Carrier AC keeps shuting off on a pressure sw " , posted Fri 12 Aug 07:53

Early in the morning and later at night when it is a relativly light load the AC unit has tripped off on pressure switch( 5 flashes on LED). I would have to guess on low pressure since the 2 switches ... read more

jshanab

"P+I+D " , posted Thu 11 Aug 23:09

can anyone explain in laymans term what is prop, P+I and PID control thanks ... read more

jbmendoza

"hvac book " , posted Thu 11 Aug 22:55

hello im searching for a good HVAC book i will use as companion in troubleshooting and repair please recommend, i heard that the handbook by sheng kwan or wan, is it a good book? ... read more

jbmendoza

"Hot Water Heater " , posted Thu 11 Aug 20:27

I hope I can post a question regarding hot water heaters. I have a problem with an AO Smith high efficincy hot water gas heater. The pilot light keeps going out on me, but at random times. The pilo ... read more

Gilson

"Freon Leak " , posted Wed 10 Aug 23:55

I have a Rheem 80 Plus 5 ton unit and it appears every month I lose all the Freon. We pressure tested the entire system to 200psi for approximately 15 mins then sucted the lines for another 15 or 20 m ... read more

ejohn90472

"trane XL19i " , posted Wed 10 Aug 18:14

I am building a new house and using trane XL19i. Is there a thermostat that comes with these units? If not, which type/model should I use? ... read more

charlieb

"New to the board... " , posted Wed 10 Aug 10:22

Hello all, just wanted to say "hi". I own and operate a HVACR business in Little Rock, AR. This looks like a very interesting site and I look forward to spending some time with you all. Sam ... read more

SScoulter

"Hvac training?? " , posted Tue 9 Aug 19:32

im currently employed as a electrican/instrument tech in a local plant and am interested in learning the in and outs HVAC to possibly change jobs in the future... or start a business.....is there any ... read more

bullbag

"Armstrong ultra 80 blower starts and stops " , posted Tue 9 Aug 07:41

My upstairs unit located in the attic, has a problem where the blower fan starts the stops it does this several times before it stays started. Going in the attic I can hear a relay engage, the blowere ... read more

jvmiller99

"Trane Furance Blow Motor Help " , posted Sun 7 Aug 19:58:

I have a Trane furance /Heat pump and the blower motor stays running. I have replaced the thermostat and every once in a while it will operate fine at times the blower motor will continue to run. I ha ... read more

aajd11

"car AC? " , posted Sun 7 Aug 19:02

This is the first time I am looking at a car AC. It is a 12 yrs. old car and never been to an accident. I know I need a 609 to work on automobile AC. I am just curious how compressor works in a car. ... read more

beginner

"Heat Pumps " , posted Sun 7 Aug 17:56

Ripping out a heat pump and putting in regular A/C unit and coil......any special procedures to take that anyone knows of? ... read more

Mike Excel

"Bryant 90 plus " , posted Sun 7 Aug 17:18

I was changing the t-stat and now i have a code 24 it is secondary voltage fuse is open check for short circuit in secondary voltage (24v) wiring including thermostat leads disconnect thermostat leads ... read more

tick

"Bryant 90 plus " , posted Sun 7 Aug 17:13

... read more

tick

"AC Blower bearings noisy, how difficult to fx " , posted Sun 7 Aug 11:38

This morning the HVAC blower strated making a rumbling noise. It sounds like one of the brearings is deteriorating.It looks like the blower slides out the front of the furnace (Carrier 9200).< ... read more

jskene

"Compresor kicks off and on constantly " , posted Sun 7 Aug 09:30

My AC was working but over time it slowly started to blow out warmer air. My Neighbor installs new AC units so he came over to charge my system. He told us it was low on pressure and charged the sys ... read more

jbhockey2

"Compressor tries to start while running " , posted Sun 7 Aug 09:08

We recently had the fan motor and capacitor replaced on our Lennox Air Conditioner and added a hard start kit. Yesterday, we noticed that the compressor seems to try and restart itself while it is al ... read more

eriu

"Bryant Combo Unit - No operation " , posted Sat 6 Aug 11:24

I have an older 584A Bryant combination heat/ac "rooftop" unit. A few nights ago the unit stopped functioning (blower, ac, and heat). Checked for 24v at the contactor and nothing. Pulled the secondary ... read more

mikelb5

"Need recommendation-new gas furance/AC unit " , posted Fri 5 Aug 21:29

My 12 yo AC system w/ gas furnaces need replacing - 2 zones in house currently w/ Rudd "drum furnace"-told only made for 1 year and I got the jackpot! AC not working upstairs so not pleasant on 100+ ... read more

Momof3boys