BREWHA Equipment Co Ltd. BIAC, User Manual

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BIAC User Manual Installation
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step 15).
15. A valve should be installed either to the top (outlet) port on the pump, or to
the inlet port on the Mash Colander (shown in picture below), whichever is easier
to access. Install the Mash Colander 90° hose barb to the inside port on the Mash
Colander and attach a short hose (60–90cm/2–3’) to direct the wort back into the
top of the Mash Colander. Slip the hose float over the end of the hose to keep it
from sinking down into the mash. When recirculating wort (out the bottom of the
fermenter and into the top of the Colander), it is important to throttle (partially
close) the valve on the Mash Colander so the pump doesn’t withdraw wort too
quickly (never throttle on the inlet side of the pump as this can wreck the pump by
causing it to overheat). If the pump withdraws wort too quickly, three things can
happen; first, it creates a pressure differential which pushes the grain down inside
the Colander, plugging the false bottom, leading to a ‘stuck mash’ where the wort
cannot flow at all. Second, the wort will drop so low that the element is exposed
and could melt/damage the element. Third, the pump can be damaged if ran dry.
The wort level should stay almost constant throughout the mash period—if it starts
to rise, the pump is moving wort too fast so close the downstream valve further. If
wort is not passing through the Colander at all, the mash might be stuck and need
to be stirred up again and the filter bed reformed; if your mash sticks a lot, try a
larger crush size—1–1.1mm/0.042–0.048” is recommended—or use rice hulls mixed
in with the grain). Also, adding grain slowly (to let the larger pieces settle first and
form a naturally porous bed), adding dark malt last (it tends to crush finer and is
therefore best located near the top of the grain bed), not mixing near the bottom of
the Colander (can pack grain into the openings of the false bottom), not overmixing,
and not using the pump for the first 10-15 minutes of the mash can all help
improve the flow through a grain bed. Consult Table D in the ‘Mashing’ section of
the ‘Brewing’ pages of this manual for suggested flow/recirculation rates. The pump
can move liquid much faster than recommended so the recirculation rate should be
throttled back considerably during mash and vorlauf. Always keep the feed water
level at least 60cm/2’ above the pump to provide sufficient pressure, and if the
pump starts ‘screeching’, turn it off immediately or it may be damaged.
Installation for other accessories can be see on the website’s Accessory/product
pages, and a list of brewery items not supplied by BREWHA can be seen on the
website at: https://brewhaequipment.com/pages/what-else-is-needed-for-my-
brewery
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