A Few Jobs From One Site

[@cjohns28]

With the newer version 4 uc8 boards, they will go into a lockout if a fault repeatedly happens and will stay in lockout even if the unit is power cycled. You clear the lockout by holding down the SW3 button for around 10 second’s. The older version 2 uc8 a lockout could be cleared by a power cycle. I only found this out when I asked temperzone why the newer uc8’s get stuck in lockout. I changed so many because I thought they were faulty 😂 Keep up the good work mate!

[@hvacraustralia]

Oh ok, that’s very handy to know! Thanks for that mate, definitely going into the memory bank (phone notes 😂). Haha it would catch people out when previously all you had to do was power cycle.

[@BrisBrad888]

Best way ive found to remove silicone is mini wire brush attachment for your impact. Brings it back like new in seconds.

[@hvacraustralia]

Thanks for the tip! I’ll need to grab one from Bunnings.

[@CodyHVAC]

I don’t understand your doing pressure test then using ur gas tester to check for leaks?

[@hvacraustralia]

I filmed this a while ago so my memory of this isn’t great, but the unit would have had some refrigerant left in the system. Usually if that’s the case, I’ll pump up with nitrogen, test my leak detector again the Schrader to confirm it picks up the refrigerant and then go looking. If it’s completely flat you need to get either trace gas or add a bit of refrigerant and then nitrogen.

[@CodyHVAC]

@@hvacraustralia thanks for the reply, love the videos too mate. What do you think about using an ultrasonic leak detector instead?

[@hvacraustralia]

Thank mate, glad you’re enjoying them. I’ve never had the opportunity to use one before. I’d love to get my hands on one someday to try them out. Have you used one?

[@CodyHVAC]

@ not yet mate but would also like to get one. Would work well I reckon for using pressure testing with nitrogen to find a leak

[@alijabbour1]

Hey man im a fellow fridgie from melbourne, does your leak detector work on nitrogen iv honestly never heard of that? can you clarify

[@hvacraustralia]

Hey mate. No it won’t pick up straight nitrogen, but the system had a little refrigerant in it so I was just increasing the pressure so my leak defector could get a hit off that. It’s just the fieldpiece IR leak detector.

[@alijabbour1]

@@hvacraustralia Ahhh i See, i always assumed the nitro would push the refrigerant away and that the gas could not mix with it

[@hvacraustralia]

I haven’t had issues using nitro.

[@thanktheknife]

yeah it mixes with gas. I sometimes add a little r134a vapor. Then add in my nitro charge. Electronic leak detector will have far better chance of picking up a leak. Works well on R-32 systems as electronic leak detectors

[@alijabbour1]

@@thanktheknife thats a interesting tip, iv got a fujitsu 9kw i installed 7 years ago and its got a leak that i spent 2 days searching for and cant find for the life of me

[@MentalLapse09]

Sikaflex for roof penos all the way! I had a mhi 8kw unit do the exact same thing, threw a code, i pulled the gas out, weighed it, yep low on gas. I pumped it up and tried to find a leak, i couldn't find anything. Its pressure stayed at constant, so i changed the schrader as that was the only thing i didnt check. 3 months later, same fault, i couldn't believe it. I pumped it up to max operating pressure 2200kpa from memory when i was diagnosing it, it held, no leaks found. In the end it was pair coil with pin holes in it, but i couldn't find it, it vacced down fine. Head fuck.

[@hvacraustralia]

Damn, what a pain in the arse! Do you remember the brand of pair coil? It’s weird they throw a fault code too. Mine form memory was relating to a PCB issue. I go back to this site regularly and it’s still working so definitely no board issue 😂

[@tonymontana897]

It seems paired coil these days is becoming so crap it's becoming a liability. So sick of this made in china rubbish. Manufacturers should be ashamed of themselves for the scam they engage in to make everything as cheap as possible. We used to enjoy Crane Enfield and Kembla copper and never batted an eyelid in terms of quality. It was the best in the world.