A421ABC-02C A421 Series Electronic Temperature Control, -40 to 212 Degree F Temperature Range, Single-Pole, Double-Throw

I have 2 A419 and 1 A421. I have used them at times control a fish smoker a heating pad for seedling starting and to control the blower on a gas heater. The A419 works best for some applications as it has a differential setting that follows a set point that has to be changed often as in smoking fish and I only have to make 1 adjustment each time. The A 421 works good for a set point that remains fairly constant as in a blower control for a heater. In using both the A419 and A421 I have a contactor for the final switching heaters for smoking. It seems the sensors are interchangeable which is a nice feature as I has one fail "sF" while smoking fish so I had a spare from one of the other ones not in use.

we were having trouble with the old analog controls they had a tendency to stick now the bate minnows are very happy with the temp not fluctuating

This is a boring product, as it should be. Once I deciphered the instructions and got it wired up and configured, it's worked without any fuss. The menu system isn't the most obvious, but once you figure it out, it's acceptable. Our fridge went out and I used this to convert a wine/beer fridge which only went down to 40F. I chose this over other cheaper ones because it has an anti-short cycle mode which is important for refrigeration to keep from damaging the compressor.

Was a drop in replacement for the original. Wire position was different but labeling made it easy connect.

No real complaints works as described. The instructions are pretty difficult to understand, but once you figure it out, the unit operates as expected.

I've been using these for 8 years in an application where they switch constantly day and night. Combined with RIB relays to isolate the loads from the controllers, these have been flawless. These do exactly what they should do year after year. These harken back to a time when things were built to last and do the job they are supposed to do. It's a shame so many products fail to produce the bare minimum. I have 4 of these (actually the other 3 are pre Penn and one is pre 421 designation) running in various tasks in my house and will always go to Johnson Control (now Penn) for this application assuming they continue to build a quality product.

Just want you need

Product as advertised and very fast shipping; thank you price was great also, thanks

Great quality temperature controller. Easy to install and easy to program settings. Works well. Very accurate.

As advertised

Very good dies what its supposr to do

Easy to install

Regulation de température de panneaux solaire de piscine.