19
We reserve the right to make changes without notice
COSTER
19. PREHEATING OR DEW POINT CONTROL
The function is only enabled if detector B4 is connected.
It can be used for the following purposes:
• PREHEATING
= preheater battery unit control according
to humidification condensation temperature through
duct mounting detector B4, installed downstream of
the humidification unit.
• DEW POINT= Dehumification value compensation to
limit dew buildup on swimming pool windows – detector
B4 should be placed so that it adheres to the glass
19.
1
Preheating temperature control
If detector B3 or detectors B1 and B3 are connected, the
controller calculates preheating temp. T
°
pre according to
the following:
– Condensation curve calculated on the basis of room
temp.( t
°
r) and room humidity ( h%a) actual
values
– Minimum value
– Manual adjustment in
if applicable
The controller calculates the dew point temp. T
°
dp according
to the following:
– Minimum value
– Manual adjustment in
if applicable
The controller compares preheating temp. T
°
pre with the temp. measured by detector B4, and
calculates the load value for Preheating
Qpre according to deviation detected.
19.
2
Swimming pool windows dew point temperature control
The controller calculates the dew point temp. T
°
dp according to the following:
– Condensation curve calculated on the basis of room
temp.(t
°
r) and room humidity (h%a) actual
values
– Minimum value
– Manual adjustment in
if appliable
The controller compares dew point temp. T
°
dp with the temp. measured by
detector B4, and calculates the reduction of the value requested for
Dehumidification
H%Dehu according to deviation detected.
P r e h e a t i n g T .
M i n i mum :
1 0 . 0 c
M0.
11
Dewp o i n t
T .
M i n i mum :
1 0 . 0 c
M0.
11
P r e h e a t i ng T .
Ca l c .
: 1 6 . 0 c
±
0 . 0
M0.
12
Dewpo i n t
T .
Ca l c .
: 1 6 . 0 c
±
0 . 0
M0.
12
De humi d i f i c a t i on
Compe n s a t . :
±
0 . 0
M0.
10
De t e c t o r s L a y o u t
– – – 4 – – – –
M2.
1
20. SPECIAL CONTROL
20.
1
Auxiliary heater battery unit control
If the system includes an auxiliary heater battery unit to supplement
the Heating load, one of the outputs Y1, Y2 or Y3 can be assigned
the AUX. HEA.
function.
Load Qaux cascades from load Qhea.
20.
2
Heat pump control
If the Air Handling Unit is composed of a direct-exchange, one of
the outputs Y1 or Y2 can be assigned the HT.P.HEA
.
winter function.
Load QH.pmp replicates load Qhea exactly, the only difference
being that when outside temp. drops below the value T
°
o
min,
load
QH.pmp is cancelled.
Y.. -W i n : HT . P . HEA
Y.. - Sum: COOL I NG
M2.
7.9
Y.. -W i n : AUX . HEA .
Y.. - Sum: AUX . HEA .
M2.
7.9.11
M1.
19
M i n i m . Ou t s i d e T .
He a t Pump
:
– – c
P r e h e a t i n g T .
M i n i mum :
1 0 . 0 c
M0.
11
P r e h e a t i n g T .
Ca l c .
: 1 6 . 0 c
±
0 . 0
M0.
12
Us e d e t e c t o r
B4
PREHEAT I NG
M2.
4
M2.
4
Us e d e t e c t o r
B4
DEWPOI NT
Us e d e t e c t o r
B4
PREHEAT I NG
M2.
4
Us e d e t e c t o r
B4
DEWPOI NT
T
°
pre
–
+
0%
100%
50%
Q
Pre
t
°
pre
Pb
pre
–
+
0%
100%
H%
Deum
t
°
dp
Bp
rv
T
°
dp
H%
Deum
0%
100%
T
°
Hea
Pb
Aux
50%
–
+
t
°
Q
Hea
Pb
Hea
Q
Aux
0%
100%
50%
–
+
t
°
o
1
°
C
T
°
o
min
Q
Hea
Q
H.pmp
50%
100%
0%
Q
Hea
T
°
pre
T
°
dp
25
°
15
°
5
°
20
°
10
°
30
°
20% 30% 40% 50%
60% 70% 80% 90%
h%
r
t
°
r
6
°
10
°
15
°
20
°
25
°
30
°
35
°
t
°
r
T
°
min
