External temperature probe for Haliea 150A

[gryphon]

Can anyone advise how do I modify the Haliea 150A chiller to use an external temperature probe (thermostat)?

[gryphon]

All thanks to the help from the various bros, I have managed to modify my Haliea 150A chiller to use an external temperature probe. Just want to share with other bros who are interested in this DIY. The modification took me less that 20min.

The external temperature probe/sensor was purchased from Sim Lim Tower (NOT Sim Lim Square) B1. It is the shop near the escalator, just ask if they sell Fox temperature controllers.
Bros here have successfully used 2 similar models (same price), FN-200N's replacement temperature probe which has a long metal probe/sensor or a NTC based plastic temperature probe/sensor. I have bought the latter, picture as shown below.


First remove the front panel of the Haliea 150A chiller by pulling from the bottom of the panel.


Next use your fingers (both hands will be easier) to reach behind the display panel to locate 2 tabs and press them down and push out the front panel.




The 2 tabs which I am refering to are circled below.


You can see that there is a pair of wires (red and black) which is connected to the internal water tank's temperature probe/sensor. Disconnect the connector (circled below) and attach the external temperature probe/sensor to it (attach to the end that is connected to the display panel). To attach the external temperature probe/sensor to the connector, you can use soldering iron to solder the points together.
Note that for the NTC based plastic temperature probe/sensor, you need to connect the wire with white words to the red wire and the other plain black wire to the black wire.


You can calibrate your chiller to match your tank's temperature by pressing and hold the Up and Down arrows together. Maximium is +1.5Deg and -1.5Deg

good sharing bro

[Navanod]

Good job bro! Might be worth a sticky?

for those who don't know or don't have soldering iron, can use this wire connecter (with screw).



just expose the wire and put into the connector accordingly to bro gryphon instructions will do.

Good job bro Gryphon

[gryphon]

Thanks for all your help Alan

Originally Posted by gryphon

All thanks to the help from the various bros, I have managed to modify my Haliea 150A chiller to use an external temperature probe. Just want to share with other bros who are interested in this DIY. The modification took me less that 20min.

The external temperature probe/sensor was purchased from Sim Lim Tower (NOT Sim Lim Square) B1. It is the shop near the escalator, just ask if they sell Fox temperature controllers.
Bros here have successfully used 2 similar models (same price), FN-200N's replacement temperature probe which has a long metal probe/sensor or a NTC based plastic temperature probe/sensor. I have bought the latter, picture as shown below.


First remove the front panel of the Haliea 150A chiller by pulling from the bottom of the panel.


Next use your fingers (both hands will be easier) to reach behind the display panel to locate 2 tabs and press them down and push out the front panel.




The 2 tabs which I am refering to are circled below.


You can see that there is a pair of wires (red and black) which is connected to the internal water tank's temperature probe/sensor. Disconnect the connector (circled below) and attach the external temperature probe/sensor to it (attach to the end that is connected to the display panel). To attach the external temperature probe/sensor to the connector, you can use soldering iron to solder the points together.
Note that for the NTC based plastic temperature probe/sensor, you need to connect the wire with white words to the red wire and the other plain black wire to the black wire.


You can calibrate your chiller to match your tank's temperature by pressing and hold the Up and Down arrows together. Maximium is +1.5Deg and -1.5Deg

Wa, great job, thanks for sharing bro

Nice sharing. What is the outcome of the modification , improvement on efficiency?

Mind to share further

bro gryphon, thanks for sharing. Might be looking to mod my 150A too. What are the improvements using the external probe?

[gryphon]

Originally Posted by bigbird126

Nice sharing. What is the outcome of the modification , improvement on efficiency?

Mind to share further

Originally Posted by lizhien

bro gryphon, thanks for sharing. Might be looking to mod my 150A too. What are the improvements using the external probe?

The main reason why I mod is because I find that some time after my chiller kicks in, the chiller's temperature which measures the chiller's internal water tank actually rises before eventually dropping (suspect that the hot air is heating the water tank causing the raise in temperature). This caused my chiller to kick in longer to cool to a lower than the actual temperature.

My chiller kicks in at 25 deg (for about 45min+) and kicks out (nearly 2hrs) when its reading is at 24 deg but my tank temperature is 23 deg or lower! This gives my tank a rather big temperature difference of 25 deg to 23 deg or lower.

After mod, my chiller kicks in 30min and kicks out 1.5hr. Temperature is much more stable now between 24-25deg.

Since there are many queries on the price of the probe, just let everyone know its 2 red notes, bought at Sim Lim Tower Acez Instrument Pte Ltd, #B1-38