chiller kick on very often

[tansh]

Hi,currently my resun cl650 chiller turn on for 5min every 10min to temp set at 26deg.I notice that some other chiller run shorted time but off longer time like running for 1hr off for 4-6hr.Would like to know is it because my chiller not hook up the currect way or could be some other reason.Pls refer below short detail of my current chiller setup.

3X2X2 maintank

2.5X1.5X1.5 sump tank,3 compactment

1.filter wool

2.dsb plus LR

3.reture pump,pump for skimmer,pump for chiller.

My pump for chiller is 2000l\h,1 weipro4000 pump for return and 1 weipro4000 pump for skimmer.All the pumps are place in the same compactment,could it be the heat giving out by all pumps and flow into my chiller cos kick in very often?If thats the case can i mod with external temp pro and place at the first compactment.Hope someone can advice me,many thks

[AlfaRomeo]

Make sure the in and out outlets of the chiller are not too near each other or it will be 'short-circuted'. best is intake from sump and outlet into main tank..

Barring the above problem:

The off period of the chiller depends only on your heat load and total volume of water. It is not indicative of the chillers performance. What is important is the time taken to cool the tank to its set temp..

E.g

1)Using a 1/2hp chiller with result in a 1hr off period between kick-ins

2)Using a 3hp chiller will also result in a 1hr off period between kick-ins

but

1) Takes 1 hr to cool down the tank to set temp

2) Takes 15 mins to cool down the tank to set temp

Figures quoted are for illustrations only

Best is to place all pumps externally if you can... less or minimal heat transfer to the water..

[tansh]

My intake is from sump and output to main tank,sorry miss out on my detail.Im thinking gettng a external pump to replace all my pump but not enough space cos below cabinet space cover up by my sump tank

[AlfaRomeo]

What is the delta set on your chiller?

[weileong]

could be too slowly flow rate used for chiller cos it is configured to return to main tank.

Perhaps you like to tell us what pump you using to drive your chiller?

If no space in your sump, you can use an egg crate/platform to raise the pump out of the water but use an elbow to suck in the water. However if you used this way then the flow rate will be lower.

[tansh]

What is the delta set on your chiller?

Sorry,what is dalta set mean?

I set the the temp to 26deg,when the temp shoot up to 28deg the chiller start to chill until it reach 26deg.

[AlfaRomeo]

That means that your chiller is set with a delta of 2 degrees (28-26)

Delta is generally meant as the difference between the target temp and the temp that the chiller will kick in..

[tansh]

could be too slowly flow rate used for chiller cos it is configured to return to main tank.

Perhaps you like to tell us what pump you using to drive your chiller?

If no space in your sump, you can use an egg crate/platform to raise the pump out of the water but use an elbow to suck in the water. However if you used this way then the flow rate will be lower.

Im using ATMAN 2000l\h pump for my chiller,the flow from sump to maintank seem alright to me.

Btw any suggestion what best and safe external pump should i get,i dont want later the pump get burn and caught fire

[AlfaRomeo]

Get the Eheim series... proven reliable and safe.. 1260 gives a flowrate of about 2400 l/hr and 1262 gives 3400L/hr

How high is the return cos you got to factor in the loss too.

Whats the recommended flowrate for the chiller?

[tansh]

Get the Eheim series... proven reliable and safe.. 1260 gives a flowrate of about 2400 l/hr and 1262 gives 3400L/hr

How high is the return cos you got to factor in the loss too.

Whats the recommended flowrate for the chiller?

The height from chiller to maintank around 1.5m,the recommend pump for cl650 is 1800l\h.

[Eric]

The height from chiller to maintank around 1.5m,the recommend pump for cl650 is 1800l\h.

change to an external temp. controller, ur controller is not working properly.

Eric

[tansh]

change to an external temp. controller, ur controller is not working properly.

Eric

Anyone here know how to mod external temp. controller for resun cl650 and how much,thks

[Kenji80]

Maybe your pump is not running. I have experience this when I forgot to on the pump.

[Domino]

Hi!

Think I figured out what your problem is... You are using an atman 104? You must be careful, that if your pump says 2000l/H. that is at zero loss. the pressure of your atman 104 should be 2m or 2.5m. thake away the 1.5m height loss and say at least .4m piping loss and huge losses in the chiller (I estimate close to 1m losses from measures I've caried out), you should be running at less 200/H which is way too low. You need at least 900L/H real flow rate through the chiller. If you still have your atman box, you can check the relationship between losses and flowrate on the graph on the side of the box.

the chiller will keep sensing that the water has cooled because it is moving so slow and soon after sense that i it too hot and will kick in again. I'm using a laguna utility pump 5 (5000L/H and 2.5m) as a return pump through the CL 650 chiller. It works like a charm. Cools 300L of water by one deg in less than 10 min and kicks in about once every hour or so. Real flowrate must be aroud 1000 to 1500L/H after all losses and regulating valve slightly closed.

Best is to get a better return pump and run the chiller on the same pump.

[spawns]

Yup!

[tansh]

Hi!

Think I figured out what your problem is... You are using an atman 104? You must be careful, that if your pump says 2000l/H. that is at zero loss. the pressure of your atman 104 should be 2m or 2.5m. thake away the 1.5m height loss and say at least .4m piping loss and huge losses in the chiller (I estimate close to 1m losses from measures I've caried out), you should be running at less 200/H which is way too low. You need at least 900L/H real flow rate through the chiller. If you still have your atman box, you can check the relationship between losses and flowrate on the graph on the side of the box.

the chiller will keep sensing that the water has cooled because it is moving so slow and soon after sense that i it too hot and will kick in again. I'm using a laguna utility pump 5 (5000L/H and 2.5m) as a return pump through the CL 650 chiller. It works like a charm. Cools 300L of water by one deg in less than 10 min and kicks in about once every hour or so. Real flowrate must be aroud 1000 to 1500L/H after all losses and regulating valve slightly closed.

Best is to get a better return pump and run the chiller on the same pump.

Thks for the advice,I hv check the lenght from sump to chiller is 1.8m and chiller to main tank is 1.5m,could it be the distance too far that made the flowrate under run.If I relocate my chiller to another position to shorten the length from sump to chiller like 1m and chiller to main 1.5m,will this solve the problem?

Btw,R u using external or internal pump for reture and chiller?

[Domino]

The length of your tubes matters, but it's mainly the height difference between the output noozle of the pump and the water level that matters and the number of L or U turns you've got.

The pump I'm using is internal to the sump.

You need a pump with high pressure (ie: 3 or 4m) with not so high flowrate (3000L/H) or higher flowrate (ie: 5000L/h) but lower pressure (ie: 2.5m) The end result will be the same: 1000-1500L/H florate at 1.5-2m pressure losses.

Cheers!