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Got a call today rtu not running.Checked voltages out and found 3 amp fuse control circuit fuse blown.replaced fuse and fuse blow again.Pushed contactor for compressor in manually to listen to...

Had to do a start up on a chiller and found that the contractor used to shut down the chiller last year took out all of the control circuit fuses (8) disconnected the outdoor sensor on the terminal...

It may not matter but you know the standard 4 or 5 are the same 99 percent of the time.Ant mechanic can go to the cs terminal block to figure out the wiring but lets face it,as I stated my post was...

posted this on residential but more of a commercial problem.I am finding that the blue and orange control circuit wires are constantly being swapped for second stage cooling and heating.wondering if...

I have noticed that on quite a few thermostats that there has been second stage cooling sometimes is using the blue wire and sometimes an orange wire and the same goes for second stage heat.Talked to...

does anyone know if the tool that i use to remove schrader valves for 1/4 fittings can be used for auto r-143 fittings if I remove the quick disconnect or is there a special tool for auto. this is...

can anyone site me from the code all the places cold air returns arent allowed. I know the kitchen is one how about the others

doc what year did the rheem start using the spark ignition?I have a ten year old rheem with hsi

roc I had a feeling it might be a firestat but trust me I looked for a reset until the cows came home.My biggest concern was that there were relays on the board, I wasnt sure if a relay was working...

i was stumped because i was getting 24 volts at the unit on the roof but couldnt jump it out at the thermostat even i was getting 24 volts at r on the therm.i couldnt jump out w or y at the therm but...

worked on a air handler yesterday and unit ran in heat mode when jumped out at the unit control circuit but not at the thermostat.Had power at the thermostat and jumped thr r and w terminals but no...

control tech you nailed it.When i got to work at 600am I had it working by 610.If i knew you i would by you a sixpack,but I dont so thanks

i have the fan code at 2-0 which according to the literature is fan operation only when theres a call for heat or cooling.Im going to double check though and i appreciate your time and info

installed a honeywell 3700d series 2000 thermostat on a rtu and I cant get the fan to stay on auto.Checked all the wiring ,ran the thermostat in test mode ,checked out,made sure the codes were...

Stryder you beat me to the punch.people dont realize that these enthalpy boards last only a couple of years and then they get sticker shock when it comes time for replacement

it sounds like bad valves .just wondering do you hear the valve when it gets energized?

I understand the trane tru sense monitors are a pos.I remember alot of positive feedbach on the bacharach monitors.We're looking to replace our trane pos and wander if any feedback on these. thanks...

these are filtered monitors from trane. tru sense monitor didnt have time today to check the floor drains but thats and interesting idea.thanks for taking the time to reply

anyone experience trouble with their refrigerant monitors constantly sending off alarms?had the company come out and change the filters and calibrate it but still keep getting false alarms like 1-6...

just a guess but you might want to check the oat as well as the enthalpy control.the manual tells you that the enthalpy controls are expected to be changed every couple years. i agree with mardoman...

i was responsible for removing the equipment. i just wanted a certification that the unit was either recovered or empty.i know even though i"m certified i cant tag it without a recovery unit...

hey guys help me out.i do hvac work for the usps and on one job involved disposing of an air handler with 10 pounds of r-22.since they dont want to be bothered keeping records for refrigerant use and...

yes, the square d literature says to check the thystors

has anyone have any experience troubleshooting the altistart soft start motor starters from square d?seems if you put the disconncet off and on too fast the fault light comes on and its shot.did the...

i"m a vet and i would only get preference on non skilled jobs.here in south jersey only 2 people passed the building equipment mechanic test.they want you to know welding, hvac,...