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@@Deenibayanoriginal To control temperature and humidity by using a PLC you need to have a software downloaded on to the PLC and the PLC should have analog imputs and outputs . If your AHU have a heating ,cooling heat exchanger and humififier controlled by valves driven by actuators and your heat exchangers are using lycol or water then the PLC will control the T and RH by instructing the heat exchanger actuators to alow the heat exchangers to heat and cool acordingly to the setpoints . If you are using DX coil then you ca have as well capacity control etc . The humidity control is done by tne PLC only if the AHU is equipt with proper heat exchangers and actuators or other form of capacity control valves . You can act directly on compressors or gas boilers to control the heating cooling and RH considering that you also have a humidifier fitted in to your system .There are many ways to build a RH % control . Please watch my other videos about the RH% control .

@@TechnicalChallenger sir in our ahu there is only chilled water valve and hot water valve and by using this I have to control rh and temperature

Can you suggest me how can I make a ladder logic in my plc

@@Deenibayanoriginal Dear Friend Are uou familiar with laddr logic ? What PLC or BMS are you using

@@TechnicalChallenger sir I'm using delta plc and analog card for analog signals

Yes you can

Please be more explicit

When pump start the return pressure is lower that the flow pressure . The presurizatiin unit follows the return pressure .When the pump is not running the only pressure difference is in between the lower and any higher point where the pressure is taken . When the pump is running the heating agent is on dynamic state . The presurisatiin unit is monitoring the retun pressure .

Also the presurissatiin unit show 1.5 bars and the return PRV is set at 2 bars . The flow PRV is set at 3 bars .

Thank you sir . I am also learning and I am still hands in tools. I am just sharing with my fellows engineers the daily issus I have when running trough HVAC systems .

At least an emotion have been born .Nothing happen if the potentiality remain just potentiality . Kindness makes an engineer more human .

Tx

Are you in HVAC Business ?

Test the plug Test the power supply on PCB Test the fuse on PCB If the fuse on PCB is damaged then check the PCB Resistance or unplug from PCB the Water Pump The Compressor and the Fan .Replace the PCB fuse and see if lights up when you plug it in .If yes then test the fan ,the water pump and the fan .see witch one is blowing the fuse .

@@TechnicalChallenger Thank you! Have a nice day👍🏻

Poi e de invatat putin Au o arhitectura si un algoritm mai diferit de alte systeme dar e ok . Eu nu fac programare acuma . Am lasat programare ca mi a mancat viata . M am apucat de managemet in industria farmaceutica

You have to cut the compressor seal port and to charge it there . For that you need to atach a valve to the compressor port . Then you use a scale ti charge the system after you vacum it of course .

Did the compressor luse the oil or the refrigerant . If you have a heat pump dryer then there is more likely to lose the refrigerant rather than the oil . Unless you break the compressor pipes and and yrn it up side down or run it lond ours with broken pipes .

Do you have a email to send the pictures?

@@petrisoralexandru3461 Suna ma 07956487538

Check the pressure vessel inside the boiler and see if it is faulty or ifnit is correct presurised . See if the temperature is gowing above 90’C

They are before and abive the pump . Pump can not have flow in both sides The pump is pushing the liquid and the liquid is returning to the pump . So you have flow and return .

On a close circuit you have only ine pipe technicaly speaking and the pressure DP is governed by the Pump and flow restriction only when pump is running and the fluid is on dinamic state . When in static state the DP is also giverned by tue building hight but that is apolying inly in vertical pipes . Every 10m you gain aprox one Bar .

Thank you for your observation . I enjoy challanges !

Dear Frind You can attach to the module to PT 100 probes and then the free voltage relays will do the job to any connected circuit . I am not familiar with the module but geting trough its PDF it os stright forward .

Dear Friend Call me I will explain 07956487538

Dear Sir Pressurisation unit does not require calculation Please look trough my other videos . The heating installation meed calculation And the hight of the installation meed to be considered too

Thank you for your good words Life is harsh sometime . I came in UK a while ago and I slept on the streets . I could not speak english . I had no money I have instead a big heart . I put this information on You Tube to help my colleagues and fellow technicians around the world . Thank you again for your words and I hope you will find your way to have a great life .

Yes you write but in that case I would not a stop button in series .

If you remove the heat pump cover make sure you will put it back properly . Pay attention to the capillary tube that link the condenser from the evaporator . Also clean the condensate water pump . The internal filter need to be cleaned too. The wires need to be fixed back on their locker .The spinning cylinder will cut them or will rub the insulation and make a short circuit . Inside near the opening door on the lower side there are two parallel metals blades that are sensing the humidity of the clothing.Clean them too . The two parallel blades are short-circuited by the clothing moisture and as long as the PCB will receive the signal back trough the short circuited blades the drier will continue its cycle . Good luck .

I think this a brilliant video. Also you describe the fancy very well. I can identify with your outlook on managerial positions too. Your English is very good, certainly better than my Hungarian.

I have acquired a Grundig (Beko/Arcoelectric based) heat pump dryer. I was told “it doesn’t heat” so I intend to do a full strip down and decontamination of all the parts and see what happens. I also plan to check compressor start/run relay and overload (assuming it is an AC compressor like in a standard fridge). I will report back what happens. Thanks again for taking the time to post your thoughts.

If you intend to strip it I suggest to check first the dryer running protocol . First try to see if the heat pumping cycle stars . To do that you have to throw a wheat towel or something so the two metal blades that are near the door panel on the frame will be touched by the wheat cloth . The resistive short circuit sent to the PCB will initiate the heat pumping cycle . If you will wait and you will here the compressor buzzing just wait for about 5 minute .The back plate on to the back of the drier where the hot and dryer air moves from the heat pump in to the tumble dryer’s cylinder must get hot . If that is getting hot then you must clean the filters to allow the air to circulate free trough the installation . If that back cover remain cold and you can here the compressor running then the system could lose the refrigerant . Refrigerant can be 134a R600 or you will find the type on the Drier Label. If the heat exchanger is aluminium i can show you how to solder it safely not to melt the pipes . If the compressor does not start then check the Capacitor and the starting relay and the compressor,s SCR. Then have a direct try from a 230VAC power source .I mean a cable connected direct to L N E and see for 10 seconds if the compressor is running . Good look .

Dear Sir I have more videos about pressurisation units and boiler systems . If you will scroll trough my videos you will find more information . I did not really targeted expansion tanks systems as they are too simple . If you will dean with vented systems that imply expansion tanks make sure the tanks will be fitted at a reasonable hight so there will be enough pressure in to the system Send me your e mail to see what can I do .

Yes it is . They are both keeping the pressure in control but they are different features . One in open vented an the other one is closed circuit

Check the ionisation probe or the flame quality . If the ionisation probe have an issue then the unit will cut the flame automatically . Try to clean it first Also try to clean the connection of the wire Make shore the earth is well connected

How can check the ionisation probe ? Without flame how much be the resistor, and with flame?

@@maxxam5162 normally that is half rectified wave . You could see that in the oscilloscope . Did you cleaned the probe and the connections ? Make sure you have the appropriate distance between ionisation probe and earth

@@maxxam5162 07956487538

Hi Arron I am Mihai John If you are the Arron I know then I am happy that I could help . If not I am happy any way . Kind regards

@@TechnicalChallenger hello mate- how are you

I am ok . Working Hard . Just like u . 07956487538 You can buzz me anytime if you need help . I miss the old times !

@@TechnicalChallenger will try give you a call tomorrow- when I get 10 minutes 👍

I respect your kindness sir !

Thank you I wish I was more explicit but english is my second language and I am struggling a bit .

The presurisation unit is just to make sure the pressure loss is compensate . The water quantity pushed in to the system should be very small unless there is a nasty leak . Technically speaking the efect of the injected water is not to be considered when talking about temperature .

Yes you are very right . Thank you for that observation . I made this video explaining only the issues that could be generated by the inappropriate settings . Technically speaking you are perfect right . To segregate the system you need valves . Make sense . What can I say . I am privileged to met people with eagle eyes like you . Al my respect.

Appreciate you feedback Thank you for you kindness

Dear Sir I am not smarter than you The earth is lager than us and plenty for all of us to learn I just want to share my pain with my fellow colleagues.

There i a book about calculations and designs . That is the easy part . The concept is the hardest .I can gave to you some guidance .

I think it's pretty obvious he's not a HVAC Designer.

@@hvacdesignsolutions Dear Sir HVAC designer ? Heating ventilation and Air conditioning designer ? I respect your opinion about me . I just try to help as much as I can . I am working in control philosophy but I can help you with the design .the problem os that I do everything for free in my own time and the calculation is irrelevant at this point . Once you will know what you want then I can involve some formulas to help . Gas ,water ,air ,heat load ,air change rates or differential pressure cascade are subject to a complex approach . So could you please tell me how can I help you ? We do not have to be stingy .We can support each other to navigate trough this life .to make it better . 😀

Good question .Thank you . Because a chiller is usually a cooling system the pressurisation unit will work with an inverted value. When the chiller is off the water is worm and the water pressure in to the system is related directly to the water temperature . You must fill the water circuit on chiller with a maximum pressure allowed by the system . Make sure that you are below the PRV set point . The pressure on the chillers water circuit will drop when the chiller will cool the water . We all know that the water shrink until is freezing .When it is freezing the the water volume is increased again but this is just a basic side explanation . The pressurisation should be set to support the water pressure drop when the water is cooling down . The pressure vessel should be carefully chosen to provide the appropriate elasticity for the system . Technically YES The pressurisation work the same but the pressure in to the system will work in opposite to a boiler system as the water is losing the heat when chiller is working so it is obvious that it will loose the pressure . If the system elasticity is not well calculated the pressurisation will compensate the low pressure when chiller is running and the PRV will eliminate the water when the chiller will rest in night time . If the chiller runs continuously and the variation of temperature is zero then the pressure variation will be zero and the pressure vessel will be good only when the chiller will be turned off . Hope that helps . With respect . Mihai John