3
P12
: SETTING OF COLLECTOR PUMP SPEED
This parameter can be selected by the ‘menu’ key
and permits
to set the data which will control the speed of the collector
pumps connected to OUT1 and OUT2.
The working principle which regulates solar collector pump
speed variation is very much linked to the need to keep the
difference in temperature between the solar collector and the
boiler as constant as possible (T).
Since it is a well-known fact that as incidental solar radiation
increases
the T also tends to increase
one way of decreasing
the T whilst maintaining incidental solar radiation constant is
to reduce the amount of time that the
ƀ
uid transits within the
collector
or rather to increase
ƀ
uid transit speed
by increasing
the number of solar collector pump rotational speed.
WARNING!
This parameter is available only for version with variable
collector pump speed.
OUT 1 e OUT 2 are semiconductor solid state relays
suitable to drive the speed of a circulation pump. In
case they are used to drive other electric devices (i.e.
motorized valves) P12, %MN1 and/or %MN2 must be
set to 100% (maximum speed).
Using the P12 parameter it is possible to set both the minimum
work speed of the solar collector pump as a percentage and
the variation in temperature required to increase solar collector
pump speed by 1
in relation to the T (INC parameter).
The power unit is delivered already set for an optimal
operation.
The preset data can only be changed by quali
ſ
ed staff.
AFTER SELECTIN
)
PARAMETER P12 PRESS
T
*
E ‘
‘ KEY.
j
PRESS ‘
‘ TO C
*
AN
)
E T
*
E SELECTED PARAMETER;
T
*
E PARAMETER
9
ILL START
$
LINKIN
)
.
j
PRESS ARRO
9
S ‘
S
‘ and ‘
T
‘ TO CYCLICALLY SCROLL
COLLECTOR PUMP PARAMETERS:
MINIMUM SPEED OUT 1 IN
‘
MN1 3
‘
MINIMUM SPEED OUT 2 IN
‘
MN2 3
‘
INCREASE 1
‘ INC 2.
u
C ‘
j