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13
DOWN - When the brew lever is all the way down it closes the path which
allows water to come through the shower screen. The exhaust valve is open
which allows any pressure trapped above the coffee to be expelled. This elimi-
nates the chance of the user being sprayed with hot coffee or water under pres-
sure at the end of an extraction. This is the normal position in which the lever
should be left when the DD is not being used.
MID POSITION - At approximately the middle position the group is
open to the boiler. In this position the exhaust valve is closed and hot water
from the brew boiler can flow through the group and out the shower screen. If
the machine is plumbed, a steady flow of water can be expected. If operating
from the reservoir there will be a short-term dribble. At this time the pump is
not operating. The lever will not stay in this position on its own. The precise
location is just a little past where resistance to movement of the lever is felt.
UP - When the lever is moved all the way up the group is open to the boiler
and the pump is engaged. This position is used at times such as when for brew-
ing espresso, cleaning the shower screen with a short flush, or backflushing.
Brew Lever
The brew lever moves through a range with no real “stops” other than at the two extremes of all the way
upwards and all the way down. But there are three functional positions:
NOTE: The low-water lamp will not light if the user has selected the to plumb the machine and has
defeated the low water warning system by tightening the screw in the middle of the reservoir’s
platform. This is explained in Chapter 11.
19


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