The Tech's Tech

The Tech's Tech The Tech's Tech is an HVAC consulting company. We provide solutions by aiding the onsite tech

When figuring out what method is needed to charge a system; look at what metering device the system has. If it's an expa...
05/11/2020

When figuring out what method is needed to charge a system; look at what metering device the system has. If it's an expansion valve then subcooling is the way to charge. If you have an orafice then super heat is the only method. First remeber: you need to know your target super heat then, find out what is your actual super heat. You will need a digital sling phychrometer in order to find the target. Once you have collected to data use this chart to aid you in finding the target. If you are 1-2 degrees away from target you are good to go unless you are determined about being right on the money. Remember dont worry about trying to get right on the target if it is 1-2 up or down you are good.

04/19/2020

Remember when ohming out a compressor; if the c-r and c-s doesn't add up to what c&s is then you compressor windings are more than likely bad. If your resistances do not add up dont forget to always check each terminal to ground. If you read any resistance to ground whether is is only on one terminal the game is over and the compressor is grounded and needs to be replaced. It is always best to change the entire condensing unit if it is a bad burn out.

Nothing could be more frustrating that installing a thermostat and finding out there is a technical difficulty with it o...
04/12/2020

Nothing could be more frustrating that installing a thermostat and finding out there is a technical difficulty with it or trying to trouble shoot one that you think may not be working right. Well here is a way to test your thermostat. Which ever function is not working whether it's the cooling, heating or fan there is an easy way to test to see if the thermostat is sending or not sending a signal to bring that function on. Simply pull off the thermostat from the subbase. Test to see if 24 volts is present at the thermostat and if required a jumper in place. Now let's say the cooling was not coming on but, the indoor fan is coming on. Simply take a jumper wire and place one end on R and the end on Y. Doing this gives a signal to the condensing unit to come on. If the condenser comes on then the thermostat is not sending a 24 volt signal to the condenser and the thermostat should more than likely be changed out.

When you have an orafice as the metering device you have to charge by superheat. Never assume that the superheat will al...
04/11/2020

When you have an orafice as the metering device you have to charge by superheat. Never assume that the superheat will always be 10. This is a common mistake by some techs. First let your system run for approx 10-15 minutes. This allows the system's pressure and temperatures time to stabilize when attempting to charge or perform a seasonal check. First after system is stable find out what your target superheat is suppose to be. We use a superheat charging chart. Once your target superheat is found on the chart; find out what your actual superheat is and compare the two. If your superheat is 3-4 or more degrees higher than normal; it is likely that you could be under charged. Simply add some refrigerant and check again. Should your superheat be 3-4 degrees or more lower than the target it could mean that your System is overcharged. Simply recover some and reevaluate the superheat for charge accuracy.

04/11/2020

Remember when absolutley lost for cfm to a room calculate lxwxhx6÷60 will give you cfm. This is for a room with no extra heat load.
L= length
W=width
H=height
6= air changes per hour
÷60= to change hours to minutes.

04/11/2020

When checking why a unit will not run always use the HVAC triangle. Like the fire triangle; a fire has to have 3 things to sustain a flame: Air, heat source, and fuel. Take away one of those and a fire cant exist. When troubleshooting a unit whether it's the indoor or outdoor unit use a formula that I came up with....The HVAC Triangle. The triangle goes like this and in this order. 1: (Main power): what's the point in checking the refrigerant charge in the system if nothing's running. 2: (Control power): once you establish main power is present then check to see if you have control power or where you are loosing it at. 3: ( refrigerant ) cant cool a home down if you dont have any refrigerant in a system. Approach all trouble shooting problems this way and it will save you time on the job and getting the customer back up and running faster.

500 microns can be a very slow process so when pulling a vacuum pack your patience. Check your hoses for tightness; a lo...
04/11/2020

500 microns can be a very slow process so when pulling a vacuum pack your patience. Check your hoses for tightness; a loose gauge connection can make for a frustrating time when you realize the system can't hold a vacuum.

When installing a new unit always pressure check welds with dry nitrogen and then pull a vacuum to ensure all non conden...
04/11/2020

When installing a new unit always pressure check welds with dry nitrogen and then pull a vacuum to ensure all non condensibles are removed.

04/11/2020

This site is for technicians who are starting out in the residential HVAC field; whether young, mid or old as dirt technicians ( such as myself ) who need help time to time. I got into this field and have been for all of 32 years. My father who is my mentor has 56 years in this trade who recently retired.
So many technicians starting out in this industry especially the residential side of this trade come across a problem that stumps them time to time. It may also be on a daily basis. Problems in this industry can seem to be as complicated as wiring the space shuttle and finally realizing it was as simple as a float switch in a drain pan that kept the system off.
I started teaching HVAC 5 years ago and I am enjoying every minute of it. As the semester's would come and go; students would often call me looking for an answer on a unit they were working on. When talking with the student and several pictures of the unit they were working on later often a resolution to their problem was found. So I realized there was a need for a helping hand to be right there next to the technician starting out....A so called tech's tech.
So here recently I saw a need for technicians starting out to have a resource to turn to....whether the lead technician is having an issue with a unit not running or a technician doesn't want to keep calling the boss asking for help. I know how it feels when you hate to keep calling the boss on an issue your having trouble with. This is why The Tech's Tech was formed, to have a ready resource to help you find answers to problems. As a contractor and business owner myself the one thing I have never forgot is that...I was once in your shoes. Never stop asking questions. If you dont ask questions you won't learn.

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