Basic HVAC Controls - learn hvacr
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Date: 2023-11-17
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Comments and reviews: 23
Kevin
Wonderful overview, and greatly appreciated!
I can't help but think from a facilities management perspective about all the tenants who constantly complain of indoor comfort issues and how difficult it is to effectively interact with them with appropriate feedback. Disgruntled tenant personnel, Human Resources, tenant unions, Realtor lease agents and others look for and intentionally filter out technical answers in order to hold building maintenance personnel accountable for their personal issues even when the building is working properly. It is almost always a female on male complaint! It drives the occupancy culture towards the negative and it can be professionally threatening for the technical building maintenance personnel.
How do you handle that?
reply
Wonderful overview, and greatly appreciated!
I can't help but think from a facilities management perspective about all the tenants who constantly complain of indoor comfort issues and how difficult it is to effectively interact with them with appropriate feedback. Disgruntled tenant personnel, Human Resources, tenant unions, Realtor lease agents and others look for and intentionally filter out technical answers in order to hold building maintenance personnel accountable for their personal issues even when the building is working properly. It is almost always a female on male complaint! It drives the occupancy culture towards the negative and it can be professionally threatening for the technical building maintenance personnel.
How do you handle that?
reply
Warrens
While you were explaining the dead band I started thinking about PID loops. I was surprised you didnt mention it. Many controllers for industrial heating applications have PID built into them. After years of working with these controllers I still find them very confusing. I usually just put them in auto tune and hope for the best. If the temperature will not hold steady its a nightmare trying to evaluate which parameter to change and by how much. Once I got them tuned properly I entered the parameters in a spreadsheet for future reference just in case the controller failed. Awesome video!
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While you were explaining the dead band I started thinking about PID loops. I was surprised you didnt mention it. Many controllers for industrial heating applications have PID built into them. After years of working with these controllers I still find them very confusing. I usually just put them in auto tune and hope for the best. If the temperature will not hold steady its a nightmare trying to evaluate which parameter to change and by how much. Once I got them tuned properly I entered the parameters in a spreadsheet for future reference just in case the controller failed. Awesome video!
reply
Nolife
I recently had the need to design such a controlled circuit to improve the unfamous little chinese CO2 laser; ) and I will probably have to plan something similar for an automatic watering system for the garden eventually pushing the fun up to an android app to overwatch and set some parameters and collect data over period of time. Maybe next summer. Anyway, nice video!
reply
I recently had the need to design such a controlled circuit to improve the unfamous little chinese CO2 laser; ) and I will probably have to plan something similar for an automatic watering system for the garden eventually pushing the fun up to an android app to overwatch and set some parameters and collect data over period of time. Maybe next summer. Anyway, nice video!
reply
Mister
I'm a technician on an automated tram system (3-car) that has 2 independent HVAC units per car. The refrigerant compressor operates on 3 phase 575 vac, along with the condenser system/fans. The evaporator / blower fan system is 120 vac. The control board on the HVAC unit is 110 vac and 24 vdc for contactors and relays.
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I'm a technician on an automated tram system (3-car) that has 2 independent HVAC units per car. The refrigerant compressor operates on 3 phase 575 vac, along with the condenser system/fans. The evaporator / blower fan system is 120 vac. The control board on the HVAC unit is 110 vac and 24 vdc for contactors and relays.
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Jim
I'm an electrician by trade, I've worked with many different types of HVAC systems the biggest was an Ammonia system. very large industrial operation with massive tanks and huge rooftop chilling towers. Ofcourse all the way down to residential systems and window units.
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I'm an electrician by trade, I've worked with many different types of HVAC systems the biggest was an Ammonia system. very large industrial operation with massive tanks and huge rooftop chilling towers. Ofcourse all the way down to residential systems and window units.
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Kenneth
Nicely put together. Follow up maybe insulation types, installation and impact on HVAC/comfort/energy use ($)/equipment loading over time.
Well, off the clean the contact on my old bimetallic mercury switch. lol. amazing how accurate and durable these were!
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Nicely put together. Follow up maybe insulation types, installation and impact on HVAC/comfort/energy use ($)/equipment loading over time.
Well, off the clean the contact on my old bimetallic mercury switch. lol. amazing how accurate and durable these were!
reply
Dopey
i have a trinity ti 150 boiler with 3 zones--seems when the basement zone comes on the boiler goes full out to 240 yet if the main floor goes on the boiler stays at 50 & takes forever? I assume its settings? I looked at the manual it shows nothing about it: (
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i have a trinity ti 150 boiler with 3 zones--seems when the basement zone comes on the boiler goes full out to 240 yet if the main floor goes on the boiler stays at 50 & takes forever? I assume its settings? I looked at the manual it shows nothing about it: (
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Balkans
Hi guys does anyone know a good book that explains how machinerys and equipment work in a site, like cooling towers, chillers, ahu, pdu, ups etc. I am a mechanical engineer and I want to learn how all machinerys and equipment work and their components
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Hi guys does anyone know a good book that explains how machinerys and equipment work in a site, like cooling towers, chillers, ahu, pdu, ups etc. I am a mechanical engineer and I want to learn how all machinerys and equipment work and their components
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Jason
I work with many BMS, EMS, BAS systems. From Trane, Allerton, Niagara, Honeywell and many more. Thank god for the front end to monitor and help in performing diagnosis. Lots of Digital/ Binary and Analog inputs and outputs. 4-20ma or 0-10v DC controls
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I work with many BMS, EMS, BAS systems. From Trane, Allerton, Niagara, Honeywell and many more. Thank god for the front end to monitor and help in performing diagnosis. Lots of Digital/ Binary and Analog inputs and outputs. 4-20ma or 0-10v DC controls
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Luis
Amazing work as always was surprised you did not mention 3 way valves on those controls. I know there an older way but I had to change several and had to eliminate some once the building was switched over a variable speed pump system
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Amazing work as always was surprised you did not mention 3 way valves on those controls. I know there an older way but I had to change several and had to eliminate some once the building was switched over a variable speed pump system
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Michael
As a college professor who teaches HVAC, thank you so much for all your work. Lessons that would take me hours to explain are summed up by you in 9 minutes, with better retention by the students.
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As a college professor who teaches HVAC, thank you so much for all your work. Lessons that would take me hours to explain are summed up by you in 9 minutes, with better retention by the students.
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M-Cycle
There is a kind of air conditioning which does not need almost any controls. There is no compressor and refrigerant in water evaporative air conditioners, no moving parts and high pressure.
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There is a kind of air conditioning which does not need almost any controls. There is no compressor and refrigerant in water evaporative air conditioners, no moving parts and high pressure.
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Maher
For the questions in the video stated my answers are as following:
A-Residential Apartment.
B-To control the AHU via Programmable Controllers DDC.
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For the questions in the video stated my answers are as following:
A-Residential Apartment.
B-To control the AHU via Programmable Controllers DDC.
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Hedwig
I built one of it in my house, not large as a PLC unit (small as my keyboard) but still can control my temperature in my house!
(Cost around 500USD)
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I built one of it in my house, not large as a PLC unit (small as my keyboard) but still can control my temperature in my house!
(Cost around 500USD)
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khurram
If a reservoir water level is low, the signal could come back to the CPU to start the pumps so that water gets pumped from the Dam into the reservoir
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If a reservoir water level is low, the signal could come back to the CPU to start the pumps so that water gets pumped from the Dam into the reservoir
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prakash
can you please make a video on internal and external tev working in ac plant and why POSV is required for controlling flow of refrigerant?
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can you please make a video on internal and external tev working in ac plant and why POSV is required for controlling flow of refrigerant?
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Saman
instructive info thanks for the effort. but the circulation pump from the gas boiler it should be placed in the other/suction side.
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instructive info thanks for the effort. but the circulation pump from the gas boiler it should be placed in the other/suction side.
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Nate
Used to deliver HVAC commercial and residential systems, and parts. Pretty familiar with most parts, never installed any though.
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Used to deliver HVAC commercial and residential systems, and parts. Pretty familiar with most parts, never installed any though.
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education
Why use Gas for heating? When you can use heat pump that so much efficient and better and cheaper and doesn't pollute.
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Why use Gas for heating? When you can use heat pump that so much efficient and better and cheaper and doesn't pollute.
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Grumpy
I'm a controls tech by trade. We primarily deal with Schneider systems and work on mostly HVAC, lighting and access.
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I'm a controls tech by trade. We primarily deal with Schneider systems and work on mostly HVAC, lighting and access.
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Qk
Can anyone please answer my question, can we replaced water to any other low boiling liquid in central heating system?
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Can anyone please answer my question, can we replaced water to any other low boiling liquid in central heating system?
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Rocky
AC/heat pump heating and cooling with inverter variable speed bidirectional pumps save lot of energy and cost.
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AC/heat pump heating and cooling with inverter variable speed bidirectional pumps save lot of energy and cost.
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Space
Problem in HVAC system
Other company employees: need an technician
Engineering company employees:
reply
Problem in HVAC system
Other company employees: need an technician
Engineering company employees:
reply
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