Chiller confusion..

[grey_fox]

Hey Mordrake,

So the temperature shown on the thermometer is the correct figure? To 'sync' the chiller to the tank's temp, all I will need to do is press the '+-' simultaneously and then have the -1 degree corrected?

One more question I have about the resun chiller.

I have set the desired temperature at 27 degrees on the chiller, however this morning I saw the tank's thermometer showing 28 degrees and the chiller at 29 degrees, I'm wondering why the chiller is not kicking in. Anything that I am doing wrong here?

[grey_fox]

My digital themometer is also 1 degree lower than my chiller external thermometer and I thrust my chiller thermometer more. The chiller external thermometer is an add on modification and i feel it is rather more accurate and sensitive to measure tank water temperature. What is the brand of your digital thermometer?? It may depend on the location of the thermometer being placed- top or bottom? And also whether there is enough circulation to even out the temperature of the water in the tank.

By the way, greyfox, after you added on the pump, does it improve the speed of chilling and off period?

Hey Zenscape, the thermometer I am using is the JBJ submersed thermometer. I do not have an external thermostat and the +1 degree that I am seeing is from the chiller itself.

The thermometer is being placed in the middle of the tank and my water flow is via a modified (longer than usual) rainbar located at the bottom back of the tank.

Having the external pump added, the temperature drops pretty fast for my 5 footer, I can acheive a drop by 1 degree ever 20-30 minutes.

[mordrake]

Hey Mordrake,

So the temperature shown on the thermometer is the correct figure? To 'sync' the chiller to the tank's temp, all I will need to do is press the '+-' simultaneously and then have the -1 degree corrected?

One more question I have about the resun chiller.

I have set the desired temperature at 27 degrees on the chiller, however this morning I saw the tank's thermometer showing 28 degrees and the chiller at 29 degrees, I'm wondering why the chiller is not kicking in. Anything that I am doing wrong here?

i think is press either the + or - button until you see the C0 flashing.

my CL450 is set at 28C with -1C differential.
the chiller kickin sometimes at 29, sometimes 30C... maybe due to rounding?
the kick in/out range should be +-1C if i'm not wrong... wait i go back check the manual

[grey_fox]

Hey Mordrake,

I've uploaded the manual http://www.aquaticquotient.com/forum...ad.php?t=21125 and have copied out the instructions. Will try to set it up when I am home later today

Just to be sure, the chiller will only kick in if the temperature detected is +1 to 2 degrees?

If there is tolerenace between the temperature indicated on the digital display and the actual water temperature, you can rectify the temperature by following the steps below:

1. Press "SET" for ten seconds, then "CA" will jump onto the digital display, indicating that the rectifying function is in a ready state.

2. Press "+" (increase) or "-" (reduce) until the figure indicated on the digital display equals to the tolerance intended to eliminate (tolerance CA = Actual water temperature displayed temperature).

3. After your operation is stopped for ten seconds, the digital display will show actual water temperature.

[zenscape]

Hey Zenscape, the thermometer I am using is the JBJ submersed thermometer. I do not have an external thermostat and the +1 degree that I am seeing is from the chiller itself.

The thermometer is being placed in the middle of the tank and my water flow is via a modified (longer than usual) rainbar located at the bottom back of the tank.

Having the external pump added, the temperature drops pretty fast for my 5 footer, I can acheive a drop by 1 degree ever 20-30 minutes.

To cool 1 degree over 20-30mins is pretty fast for a 5 footer. Did you time the speed before using the pump?

[hii]

Hi grey fox

Resun original thermostat is no very accurate about measuring the actual temp from the tank. The probe is located near the coil and normally the reading show temperature which is lower than your tank temperature. you need to calibrate it to get better temp reading while compare to you digital temp.

If you want more accurate temp than modify your chiller thermostat to take temp from tank (install an external thermostat on your chiller and disable the original themorstat). The external normally come with 1 decimal point temp reading...like those used in artica, teco chiller. Don't ask me how to modify cause I really don't know ... call Derrick and he can help you solve it.

Lastly resun chiller thermostat is +-2 degree... mean u set 25 it will kick in when reading show 27 and stop when it reach 25.

[grey_fox]

To cool 1 degree over 20-30mins is pretty fast for a 5 footer. Did you time the speed before using the pump?

Hey Zenscape, don't quite get what you mean by time the speed before using the pump.

I switched on the pump and shortly thereafter the chiller, total time to bring that 1 degree down was 20-30 minutes.

[hii]

To cool 1 degree over 20-30mins is pretty fast for a 5 footer. Did you time the speed before using the pump?

1 deg for 30 mins is not fast ... cause it took about 45 mins to cool down 2 deg for my 5ft and after 30++ mins it kick in again....it might be same apply to grey fox.

especially nowadays temp going up already...resun C0500 will be the best for 5ft.

[grey_fox]

Hi grey fox

Resun original thermostat is no very accurate about measuring the actual temp from the tank. The probe is located near the coil and normally the reading show temperature which is lower than your tank temperature. you need to calibrate it to get better temp reading while compare to you digital temp.

If you want more accurate temp than modify your chiller thermostat to take temp from tank (install an external thermostat on your chiller and disable the original themorstat). The external normally come with 1 decimal point temp reading...like those used in artica, teco chiller. Don't ask me how to modify cause I really don't know ... call Derrick and he can help you solve it.

Lastly resun chiller thermostat is +-2 degree... mean u set 25 it will kick in when reading show 27 and stop when it reach 25.

I will probably calibrate the chiller to the tank's thermometer as that has a decimal point and seems to be pretty acurate. I intend to install an external thermostat soon enough.

Hmm so if I set it at 27, it should kick in at 29. Will experiment more when I'm home. sucks to be in the office when you know you want to fiddle with you tank.

By the way, who is Derrick (nickname?) would like to get some pointers on how to install/rig up the external thermostat.

[mordrake]

checked manual.

chiller will kickin at temp+2C.

to set the differential, press SET for 10sec and you will see CA flashing on the panel.

CA = temp in tank - chiller temp

recommended flowrate for cl650, at least 1800l/hr

[grey_fox]

Thanks Mordrake.

The Eheim pump I am using now is 2,400l/hr.

[spinex]

The calibration will run off after 3-4 mths. For my case i lazy to calibrate on my CL300.

Previously i set my CL300 at 25 degree. Usually it kick it when tank temp is 25.5-26 degree and cool to 25 degree. Quite accurate to me.

After 3-4 mths my chiller kill in only when my tanks is 26-26.5 range. Think the calibration of the thermostat need to be done again and anyway i can't be bothered.

I set the CL300 temp to be 24 degree. Now when tanks temperature is 25.3-25.8 range it will kick in and cool to 25 degree.

[grey_fox]

OK, I've calibrated the chiller to reflect my tank's temperature, I have also set the kick-in temperature at 26 degrees. I set the CA to "-3", setting it to "-2" would reflect the chiller as +1 degree more than the tank's thermometer.

Last night at 1+am when I went to the gents, I saw the tank's temperature at 27.1 degrees however the chiller still shows 26 degrees. This morning before work, the tank's temperature was at 27.8 degrees and the chiller's temperature at 27 degrees.

So now I am wondering if the calibration is off by 0.5 or more degrees? Sad fact is that the resun chiller does not have a decimal point... besides getting a external thermostat, how else can the calibration be done?

[hii]

no worry just set it to -2 is enough. the thermostat itself no accurate already so keep adjust also waste time and cause more trouble to you.

[grey_fox]

Hey hii, so I should set the CA back to "-2" instead of "-3"?

[mordrake]

i set mine at -1

before:

tank temp : 27
chiller : 28

now:

tank temp : 27
chiller temp : 27

correct?

[hii]

ya. the lower value u set the more different temp between chiller and tank. Me also set to -2.

[hii]

i set mine at -1

before:

tank temp : 27
chiller : 28

now:

tank temp : 27
chiller temp : 27

correct?

Neither correct or wrong...every chiller need to calibrate differently base on their tank temp with the thermostat temp.

[grey_fox]

i set mine at -1

before:

tank temp : 27
chiller : 28

now:

tank temp : 27
chiller temp : 27

correct?

OK, mines a bit funny.

before

(CA @ -2)
tank temp: 27
chiller temp: 28

(CA @ -3)
tank temp: 27.1
chiller temp: 26

Should I increase it from -3 to -1? or am I confusing myself? Simply put, I want my tank to cool down to 26. If I set it to -2 and the set temperature to 27.

tank temp: 28
chiller temp: 29

Chiller will kick in > reduce the tank temp from 28 to 26 and will reflect as 29 to 27 on the chiller.

Then again, I think I should use -1, makes more sense.

If -2 gives me a difference of +1 from the chiller & tank's temp, then -1 should give me +0 difference.

correct?

[zenscape]

Hi Greyfox, sorry if i had confused you. I thought you might have run your chiller before you purchased the pump. If so, did you time the chiller running time without the pump?

Hii- i need 20 to 25 mins for a 1/3HP to cool down 0.8 degree for a 90 Gallon tank even though my chiller is 2 capacity higher than the one recommended for the volume of water.

Comparably, Greyfox and yours is obviously faster in chilling time for 2 degree difference.

But i find it strange that for 2 degrees your chiller will kick in again after 30 minutes. Given the current ambient temperature, my chiller will only kick in on average 1.25- 1.5hr for 0.8 degree difference. Do you place your chiller in cabinet?