Manitowoc Multiplex Beermaster 175A04, Technician'S Handbook, Page: 122 / 174

122 Part Number STH13 9/10
Problem Possible Cause To Correct
Section 1: Restriction
Too little restriction
Too much or too little restriction in a draught beer system will cause drawing
problems. If draught beer system does not have enough restriction it may
cause the following problems:
A recovery problem
simply means that the
beer is leaving the beer
line faster than the keg
can fill the line. When this
occurs it creates a
vacuum in the keg which
acts as if there was a low
pressure on the beer in
the keg. This causes the
CO
2
to come out of the
beer line causing foaming
problems. (The following
symptoms occur most
frequently during the high
volume time of day.)
When drawing one
beer, the beer
flows very fast.
Since the recovery
problem symptoms
simulate a low pressure
problem, check to make
sure that the CO
2
pressure
in the keg is flowing and
set properly.
If a pitcher is
drawn, the beer
starts clear then
starts to show
intermittent streaks
of foam followed
by all foam.
Refer to your records to
recheck your restriction
calculation for the system.
If you find your line does
not have enough
restriction, add the extra
restriction to the 3/16" end
of the beer line. If you have
no records, make up a new
beer line with the proper
restriction and replace the
existing line.
Beer draws too fast. If the
beer draws clear but too
fast and the pressure is
properly set, there may
not be enough restriction
in the system.
Beer draws clear
but foams in the
glass.
Follow the second
corrective step above.
The beer draws
too fast to satisfy
the retailer and his
help.
If the beer still flows too
fast, continue to add more
3/16" restrictor line to the
system to meet the
retailer’s needs.
Too much restriction
If a draught beer system is over restricted it may cause the following problems:
Beer draws too slow Beer draws too
slowly with little or
no head.
First, ensure that the keg is
properly tapped. Second,
ensure that the CO
2
is set
at the proper pressure and
is flowing to the keg. Check
the beer faucet to ensure
that there is no burr by the
vent hole on the inside of
the faucet.
The beer appears
to flutter or swirl
out of the faucet
causing the CO
2
to
break out of the
beer and thus
creating excess
foam.
Systematically remove 6"
of the 3/16" restrictor line
until the beer flows with a
full faucet and at a rate of
flow desired by the retailer.
STH13_Tech.book Page 122 Wednesday, September 15, 2010 3:20 PM