Zen HVAC is dedicated to providing HVAC Service Technicians with the information they need to get the job done. Our HVAC Troubleshooting videos are short, to the point and only give you what you need to get your customers HVAC system running. We cover everything; heat pumps, chillers, water pumps, hot water and steam boilers, rooftop units, SWUDs, humidifiers, to....you get the point, we cover it ALL! We also cover every HVAC application; residential, commercial, industrial, manufacturing, mission critical...everything. Why are we better than the others? Simple; We've been troubleshooting HVAC equipment for over 35 years. We were technicians, technical trainers, and manufacture's technical field engineers. We're also fast, our videos are under 6 minutes long. And, we add a little humor just to lighten the mood!
I have a problem, the roofing unit. I turn on cooling mode, cool work properly, then I turn on heat mode I reading my gauge , and I see 0 psi , compressor noise I shut off disconnect, i think problem it’s valve his stock ,maybei not right?
I bought a new LG window ac 110 volts 7000 btu , after installation when I turn the ac on and put on the heat mode it blow only warm air but not hot , please advise.
This is what I was looking for longtime and I found it thanks sir great explanation straight forward. Please could make video on NPSHr & NPSHa checking and calculation
Math error? Isn't the midpoint of a 4-20mA signal 12mA and 8mA (as presented). Determine Span (upper bound minus lower bound): 20 - 4 = 16 Midpoint of the range (half the span): 16 / 2 = 8 Determine Midpoint (add half the span to lower bound): 4 + 8 = 12 Or, average 20mA & 4mA and get 12mA Everything else is good.
Sir I have a question, if it is a closed loop like Chilled Water Piping. The system shows a suction and discharge pressure while it is running. If we want to know the pump head(in feet)do we have to subtract Suction from Discharge Pressure(in PSI) and multiply by 2.31, please clarify thanks
wht about the propeller size ? Does propeller diameter affect the airflows? Suppose I calculated on how much airflows (m³/s) is needed to cool down a certain system, for example a generator. Now how to select a fan out from it ? The rpm of the fan depends on the rotations of the rotor since it'll be installed on the rotor. How to calculate the proper size of the fan to make this schematic works ?
Hi, thanks for the useful training. For the purpose of my research, I am looking for an equation that I can calculate the air pressure drop due to the existence of heating/cooling coils inside the Air Handling Unit. May you please introduce me such an equation if you are aware of it?
Good info I have one for u I have a 9000 btu mini split in my bedroom just it's been in there about 2 yrs worked all through the summer I went to turn heat on the unit powers up but the blower or heat does not come on but everything every other mode works what do u think it could be the solenoid not sending power to the Head?
I got question for you! I am doing pump curves on new pumps most of the time and actual dead head pressure doesn't match with the given performance curve dead head(curve given by manufacturer)! I checked speed, and impeller size and new pump might not have worn seal or impeller. Is it possible to have air trapped in water system and it will give a wrong reading as air has low density!? its happening a lot! I am really confused and looking for solution to how to find if air in water system? or its something else causing problem! Please help me if you can. Thanks!
You're right, air would skew your readings, but that isn't the culprit if the system has a standing positive pressure and the pump isn't at the high point of the system (the air typically is at the high point/s in the system) Can you give an example suction / discharge readings and the pump data? Also, if the pump has a VFD on it, be sure it's running at 60 hertz.
