12
E 136 - XTA 624 C1 Eng. 22.11.10 AM REV. 02
We reserve the right to make changes without notice
COSTER
20. SEASON SWITCHING
The controller switches the action of output Y1 and Y2 depending on the choice:
NO; WINTER; SUMMER; BY cs CONTROL; BY cs + c1 CONTROL; AUTOM. BASED ON OUTSIDE
TEMP.; AUTOM. BASED ON SEASON;
• Without season switching :
– the action of output
Y is according to setting in
– output D-E1 can be used for Remote Control On-Off
with D-E1 closed: outputs Y1, Y2 controlling
with D-E1 open: outputs Y1, Y2 closing
• Manual season switching through display:
Winter: – the action of output Y1, Y2 is according to setting in
Summer : – the action of output Y1, Y2 is according to setting in
• Season switching according to position of season switch cs (D-E1-E2).
– with D-E1 closed and D-E2 open: action of output Y1, Y2 on Winter
– with D-E1 open and D-E2 closed: action of output Y1, Y2 on Summer
S e a s o n S w i t c h i n g
N O
M2.2
S e a s o n S w i t c h i n g
W I N T E R
M2.2
Y .. - W i n : XXXXXXXX
Y .. - S u m :
M2.4.6
S e a s o n S w i t c h i n g
S U M M E R
M2.2
Y .. - W i n :
Y .. - S u m : XXXXXXXX
M2.4.6
Y .. - : XXXXXXXX
M2.4.6
19. OUTPUT Ys
Output Ys with 0...10 V– control signal can be used for:
• AIR DAMPER TEMP. = Temp. comparison air damper control
RECUPERATOR = Heat recuperator control
19.
1 Air damper control through temperature comparison
Whenever actual outside temperature t°r exceeds the target
T°rHea value, the controller starts the progressive opening
of outside air through the PI feature.
Whenever actual outside temperature t°r exceeds the target
T°rCoo value, and outside temperature t°o exceeds actual
room temperature t°r, the controller shuts outside air through
the On-Off control.
19.
2 Heat recuperator control
The recuperator is off (Ys signal = 0 V–) when:
– The outside temperature value t°o is comprised between
T°rhea and T°rCoo.
The recuperator is on (Ys signal = 10 V–) when:
– The outside temperature value t°o is lower than actual
room temperature T°r and lower than the target T°rHea
value.
– The outside temperature value t°o is higher than actual
room temperature T°r and higher than the target T°rCoo
value.
A signal converter is required to transform the 0...10V– signal into an On-Off control.
19.
3 Minimum flow temperature limit
In the case shown :
When actual flow temperature t°f drops below the minimum flow value T°f
min
the controller shuts off outside air with a modulating action.
19.4 Minimum outside air
In the case shown :
The minimum amount of outside air required to ensure air circulation can be controlled in two
different ways:
– directly through the controller display
– using a minimum air positioner Rs directly connected to the air damper actuator.
Y s - C o n t r o l :
D A M P . T E M P E R A T U R E
M2.7
Y s - C o n t r o l :
R E C U P E R A T O R
M2.7
Y s - O u t s i d e a i r
M i n i m u m : x x x %
M1.9
Y s - C o n t r o l :
D A M P . T E M P E R A T U R E
M2.7
Y s - C o n t r o l :
D A M P . T E M P E R A T U R E
M2.7
H e a t i n g F l o w
M i n : 1 8 c M a x : 5 0 c
M1.4
t°o = t°r
t°o
+
0
10
–
t°o > t°r
Ys
T°rHea T°rHea
t°o = t°r
t°o < t°r
dTrec dTrecdTrec dTrec
S e a s o n S w i t c h i n g
F R . C O N T R O L s s
M3.2
S e a s o n S w i t c h i n g
F R . C O N T R O L s s + c 1
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