16
E 121 - DTU 614
C2 Eng.
04.07.01
We reserve the right to make changes without notice
COSTER
20. FROSTPROTECTION TEMPERATURE CONTROL
The function is only enabled if detector B7 is connected .
The controller compares the set antifreeze temp. with the temp. measured
by detector B7, and calculates the
Qaf
load value
according to the deviation
detected and the PI parameters.
The
Qaf
load value acts in priority with the
Qpre
load or
Qhea
load.
If the controller has turned off the
Mp
pump, when the
Qaf
load value exceeds the 10% value the
controller turns it on again, and turns it off when it drops to 0%.
If the controller has turned on the
Mv
fan, when the
Qaf
load value reaches the 100% value the
controller turns the fan off, and cancels the
Ys
air damper control signal (closing) ; when it drops to
0%, the controller turns on the fan and restores the air damper control signal.
De s . F r o s t p :
7 . 0 c
Ac t . F r o s t p : 3 5 . 0 c
M0.
14
21. HEAT PUMP CONTROL
If the Air Handling Unit is composed of a direct-exchange heat
pump, output Y 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
T
°
o
min
value
,
load
QH.pmp
is cancelled.
Y -W i n : HEATPUMP
Y - Sum: COOL I NG
M3.
5
M2.
17
M i n i m . Ou t sid e T .
He a t . p ump
:
– – c
De t e c t o r s L a y o u t
– – – – – – 7 –
M3.
1
T
°
af
–
+
0%
100%
50%
Q
af
t
°
af
Pb
af
0%
100%
50%
–
+
t
°
o
1
°
C
T
°
o
min
Q
Hea
Q
Hea.P.Cal
50%
100%
0%
Q
Hea
