Primary Secondary Chilled Water System Working | BMS Training 2021

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. Primary Secondary Chilled Water System consists of Primary Loop and Secondary loop. The Primary Loop consist of constant speed primary chilled Water Pumps while the Secondary Loop consists of variable speed secondary chilled water pumps. Primary and Secondary loops in a primary-secondary chilled water system are separated by a decoupler or bypass line.
A differential pressure transmitter is used to control the speed of the secondary chilled water system.
We discussed in detailed the working/sequence of operation of the primary-secondary chilled water system. We also discussed the causes and effects of low delta T Syndrome.
-------------------------------LINKS--------------------------------------
Constant Primary Flow Chilled Water System Video:
• Chilled Water System W...
Selection of Valves and Actuators Video:
• Control Valve Selectio...
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Primary Secondary Chilled Water System
Primary Secondary Chilled Water System Working
Primary Secondary Chilled Water System SOP
Primary Secondary Chilled Water System Sequence of Operation
Primary Secondary Chilled Water Loop
Primary Secondary Chilled Water System decoupler
Primary Secondary Chilled Water Pump System
Constant Primary Variable Secondary Chilled Water
Primary Secondary Chiller Loop
Primary Secondary Chiller Water Loop
Primary Secondary Chiller
primary secondary chiller piping diagram
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Constant Primary Chilled Water System
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Chiller Plant Working Animation
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Chiller Plant Sequence of Operation
Chilled Water System how it works
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[@TechSystems]

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[@TechSystems]

If you find this video useful please *"Like"* this video. Also, do *"Subscribe"* to the channel and turn ON notifications to get new useful videos about BMS and HVAC.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@vnesmuonnam]

Thank you. Really detail.

[@libinpaulose1057]

Thanks for the detailed explanations.

[@haseebbteibet1756]

Great video

[@tushardhamne1200]

Thank ypu for this video....plz make a series of such videos.....❤️

[@whatifsenior5374]

Very informative

[@MuhammadUmair-ll4lr]

thank you so much sir

[@ShakilAadeez]

Great Work Brother!! your content quality and hard work can be seen in all the videos.

[@TechSystems]

Thank you Shakil for your valuable feedback.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@khaleelahmedshaik7857]

Sir your videos are good and provide precise information..please can you provide the control system of the chilled water district cooling on the building side..not on the district cooling provider side

[@saeedhameed9148]

thanks for making such a great video with detailed explanation I'm new stationary engineer was looking for such a informative video I look forward to watch your more videos thanks again

[@TechSystems]

Thank you for your feedback....Glad to hear that this video hepled you.

[@cad5273]

In general , where is the ideal location for installation of DPT

[@khaleelahmedshaik7857]

Sir...can the dia of bypass line shall be equal to the header pipe dia or the chiller pipe dia..please explain

[@sayyadafrid5101]

I was waiting.😀

[@TechSystems]

Here you go😊

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@user-fd7ph9vi8o]

Great work brother Keep it up You are amazing

[@TechSystems]

Thank you for valuable feedback and appreciation. It means a lot.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@asemakhtar9562]

Nice explanation brother ,,,,can you elaborate decoupler line valves and BMS connection details

[@ddfdae]

Question, does the command to start the chiller system come when a cooling/heating load is required in the building? For example, a thermostat temperature detects a higher temperature than the setpoint, this causes the actuator valves to open in the AHUs/FCU which then initiates the chiller start command?

[@TechSystems]

Salam Abdulrahman, Chiller plant is serving a large number of AHUs/FCUs and chiller start/stop command depends on the cooling load and different strategies are used. For example in constant primary CHWS chillers are commanded to start/stop based on return water temperature from the building, in primary secondary system building cooling load is usually determined by the flow in the decoupler so chillers are controlled based on that. For further details you can watch chillers related videos on my channel.

[@vinothkumarr4667]

Really so good explanation and thanks sir 🙏

[@TechSystems]

Most Welcome and Thank you for your feedback.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@realtruth3767]

Great 👍😍

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@SikinderVatturiv]

Awesome explanation

[@TechSystems]

Thanks

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@ishaqkhan7061]

how the temp become 10 degree in bypass line as supply temp is 6.7 and this water is coming through bypass so should it not be 6.7

[@muhammadtahir8635]

Great explanation Kindly explain, how to set accurate set point for differential pressure?

[@TechSystems]

Thanks Tahir. The differential pressure setpoint is provided by the TAB contractor after they perform the water balancing.

[@sayyadafrid5101]

Excellent sir.

[@TechSystems]

Thank you Sayyad.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@AKARSH696]

❣️

[@laworder6092]

Assalam u alaikum brother Abdulrahman Thank you very much for knowledge in which your are giving to the international community. I am very impressed with your teaching methodology.it would be very interesting if you add metric values and formulas to your videos like this you will gain more viewers Jazaka allah khair

[@TechSystems]

Waalikum Salam, Thank you very much for valuable feedback and suggestion. Will consider it for my future videos.

[@laworder6092]

@@TechSystems are you based here in UK?

[@TechSystems]

No I am in Saudia Arabia

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@royochola]

This guy is smart, he is strengthening my BMS knowledge everyday....

[@tmst2199]

Why are the primary and secondary loops are connected to each other?

[@TechSystems]

Primary and secondary loops are decoupled from each other using a decoupler/bypass pipe line. Decoupler line is designed such that flow in one loop shall not affect flow in the other loop. If flow in both loops is equal, in this case the decoupler line will not have any flow.In case of unequal flow in both loops, the difference will flow through the decoupler line and we can sequence the chiller on/off based on the direction and amount of the flow in decoupler.

[@thankwel]

I have a sincere question. Why are we not able to regulate the speed of individual Chiller by means of control system in a primary loop. For example, ChillerA is 1000GPM and ChillerB is 500GPM according to cooling capacity requirement of the load. Thanks for your awesome explanation.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@sirrom7997]

Sir what will happen if all actuator valves of AHUs and FCUs are closed?

[@TechSystems]

Very good question. Thanks for asking.. In this situation secondary pumps would be running in dead-head condition with no flow which is not desirable and can damage the pumps.. To avoid this situation either we can install 3-way Valves on some of the AHUs or FCUs or we can install a seprate bypass line with a control valve. To control this bypass valve BMS will monitor valve position of all AHUs and FCUs and once they are close, bypass valve will be opened. Hope I answered your question.

[@sirrom7997]

@@TechSystems thank you for the reply sir.Appreciated.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@fahadyaba8674]

I have one doubt sir, if the ch actuators getting closed then Delta P will be high or low? Can u assist me.

[@TechSystems]

Yes as AHUs and FCUs valves get close, delta P will increase which will be detected by the DDC controller and as a result it will reduce the speed of Secondary pumps to keep Delta P at the setpoint value. Hope i answered your question.

[@yeechingteh1764]

very informative video. Can you share video on variable primary system too?

[@TechSystems]

Sure. It will be uploaded soon. Stay tuned.

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@faisalkim4739]

Aslamaualaikum Brother here at my site primary loop pumps also consists VFDs.

[@imrankhan-ns3bi]

Good for knowledge 👌👌 can you make a video on how does FAS gets activated via bms

[@TechSystems]

Hello Imran, U FAS is integrated with BMS through BACnet or other protocol and BMS use FAS data to make software interlocks to shutdown HVAC equipment. Or hardwire points can also be get from smoke detector for this purpose. Will try to make video for it as requested.

[@imrankhan-ns3bi]

@@TechSystems it is very kind of you to share your knowledge!😇 also Could you tell me all the steps of FM 200 response incase of fire

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@MuhammadUmair-ll4lr]

sir can you tell me wich software use for this drawing

[@tmst2199]

I guess that would be "no."

[@vimalguna2408]

sir please explain 4 chiller and 4 primary pump and 4 secondary pump and 3 DP sensor how to secondary pumps working

[@TechSystems]

Hi Vimal concept and system working will be same with 4 chiller system, I am not aware about your project situation why 3 DP sensors are installed. Usually a single DP will be used to control the pumps speed. You may consider the value of DP sensor installed on the farthest place or as mentioned in the HVAC design.

[@vimalguna2408]

@@TechSystems sir this system feeding 25 floor residency building chilled water feeding 3 riser

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@jaganthangapandian77]

what is the abbrevation of GPM?

[@TechSystems]

Gallons per minute... It is unit of volume flow rate

[@miketheplumber448]

No it’s GPM

[@javeedhvactechnician7760]

kzbin.info/www/bejne/eavNaJ-uqN-lmck

[@tmst2199]

@@miketheplumber448 WTF? LOL