Whats Going To Happen To My Beer!

[lespaul]

Hi

Made an APA extract yesterday and everything went fine.

Pitched the yeast (US05) at 20 degrees and put it in the fridge with the tempmate.

ALTHOUGH I forgot last time I used it I was crash chilling so the set temp was at 1C!

I got home this morning at the fermenter was down to 9C. I've changed the temperature on it back to 18.5C, but is there anything else i can do? Pitch more yeast when it gets back up to 18?

Note to self: dont try and make beer when your in a rush...

 

[manticle]

Yeast just goes dormant when cold. It will take longer to fire but I'd wait a bit before pitching more.

 

[Kleiny]

Give it a shake to help resuspend any yeast tat may have dropped out as it comes up to temp

 

[Spartan 117]

You'll be fine. Might be worth taking the fermenter out of the fridge and let it sit at room temp to bring it up to temp a bit quicker, or if you have one slap a heat strap around it and ehat it to 18 then put it in the fridge. I don't think you'll have to pitch more yeast, check for signs of fermentation and if there are none I'd recoment making a starter for your new yeast and pitch it at 18.5C

Aaron

 

[KGB]

Let it warm up and see how it goes before re-pitching. At 9 degrees, hopefully you haven't done any harm to the yeast and there still should be plenty of goodness for them to get stuck into since its right at the start of the fermentation.

 

[Bribie G]

There is the possibility of creating petite mutants (deformed yeast cells) with a big temperature shock as described on the Danstar website:

• Temperature shock, at greater than 10C, may cause formation of petite mutants leading to long-term
or incomplete fermentation and possible formation of undesirable flavours.

I don't know what petite mutant ale tastes like but as an insurance policy I'd maybe make up a vigorous starter with a fresh pack of US-05 and hit the brew with that when it gets to 18.5 and hope that the good yeast outbreeds any mutant brain-sucking zombie yeast that might have started up B)

 

[Thirsty Boy]

petite mutants are more of a problem if you put a "warm" yeast pitch into a cold wort - shocking the yeast right when its about to try and reproduce. In this situation where you have pitched into warm wort and it has cooled down slowly overnight... not really so much of a problem.

The worst you have really done is maybe tire out your yeast a bit... they got into the nice warm wort, started to do their thing,then it got cold and the stopped, now you want them to start over - they'll be a little bleary eyed and grumpy. Warm it back up, give it a bit of a shake to give them some more oxygen and perk em up a bit. And they'll take right off.

If not, another pack of US05 isn't so expensive.

 

[lespaul]

thanks for the help!!

I had the heater belt strapped to the bottom of the fermenter and it warmed up to 18.5 relatively quickly... gave it a bit of a shake to try and float some of the yeast that might have dropped out.

Its bubbling away fine, but there is not much of Krausen. Either way it seems to be working.

If i had aerated the wort before pitching and then it was cooled, will that mean the work done aerating it wont have any effect?

 

[peas_and_corn]

You only need to aerate once, the temp here really doesn't matter, once the yeast kicked back in it would ahve done its aerobic thing like usual.