P32-EN – Subject to technical changes 04.11
46
“Functions” Menu Overview
9.7 Circulation control function “CIRCU”
Description
: When you have long hot water pipes, the
water needs to run for a while before it comes out hot
at the tap. This wastes precious drinking water.
You can remedy the situation with an additional water pipe,
called a circulation pipe, which circulates the drinking
water until it reaches its target temperature at the tap.
The factory settings ensure that you can immediately
get hot water from the tap when you need it.
• “OPERAT”
: Do not change the “Time” controller mode
for the circulation pump. The “Time” controller mode
controls the circulation pump using a time-dependent
temperature controller. Hot water is immediately avail-
able at the tap at the times that you set. Outside of
those time windows, the circulation pump is always
switched off.
• “T.CR.ACT”
: The current temperature of the drinking
water in the circulation return pipe.
• “T.CR.NOM”
: Target temperature, corresponds to
T.WW.NOM.
The pump switches on when:
a) One of the time blocks is active
and
b) the circulation sensor S11 has cooled to less than the
target temperature “T.CR.NOM” by the value “DIFF.ON”.
Example
: According to the factory settings, “DIFF.ON” =
-12 K, “DIFF.OFF” = -9.0 K and “T.CR.NOM” = 48°C.
At: “T.CR.ACT” = 48 – 12 = 36°C, the circulation pump
switches on, and at: “T.CR.ACT” = 48 – 9 = 39°C, it
switches back off.
• “TIME PROG.”
: You can set time windows to control the
circulation pump here. Outside of these times, the pump
will not operate and circulation will not take place.
Possible settings
:
Menu overview “CIRCULATION”
Menu, plain text
Factory
Own
setting
Setting
1 2 3 4 5 6 7 8 9 10 11 12 13 14
CIRCULATION
DES.: CIRCU
FUNCTION STATUS:
INPUT VARIABLE:
OUTPUT VARIABLE:
OPERAT.: Time
Time
CIRCU. RETURN:
T.CR.ACT: 36°C
T.CR.NOM: 48°C
48
–
TIME PROG:
DIFF.ON: -12 K
-12
DIFF.OFF: -9.0 K
-9.0
In the circulation menu (
top right figure
), select the
parameter you require and press the rotary wheel.
Then turn the rotary wheel until it displays the value
you require. Pressing the rotary wheel saves the value.
(Some parameters can only be changed in the
“Technician” operating mode.)
Setting the circulation times: Entering values
Three blocks are available, each with three time windows.
All the days of the week are selected at the factory, and
the standby times are entered as in
figure on right
.
Change the times as described on
page 43
under
“Setting
auxiliary heating times for the hot water buffer”
.
You can save energy by limiting the circulation
times.
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TIME PROG. CIRCU.
* 10
ABORT
00.10 - 00.00h
00.00 - 00.00h
00.00 - 00.00h
Mo Tu We Th Fr Sa Su
At the pointer position
is where you read or set
the start time for the circulation time window
