5
B 242 - XTE 602 Eng. C1
22.11.10 AM
REV. 02
We reserve the right to make changes witout notice
COSTER
C
= correction curve origin
T°f
= desired flow temperature
T°f
de
= design winter flow temperature
T°o
de
= design winter outside temperature
T°f
max
= maximum limit winter flow
T°f
min
= minimum limit winter flow
t°o
= outside temperature
• design outside temperature , used for calculation of winter heat losses from building and
depends on the climatic zone in which building is situated.
Note :
appears in the setting of both the heating zones controlled but the value is common
to both.
• design flow temperature , used for determining thermal requirements of heating zones (eg:
radiators = 70 °C ; fan coils = 80 °C ; panels = 40 °C).
• heating curve origin = winter flow temperature with outside temperature of 20 °C
The flow temperature required by controller depends also on value of ambient temperature required
by operating mode Normal , Setback , Frostprot (pa / – adjustment of curve).
12.
3
Origin of heating curve
The conventional point of origin of the heating curve (+ 20 °C flow at 20 °C with + 20 °C outside) can
be adjusted by an increase in the flow temperature (Max. + 20 °C).
The adjustment may be necessary to avoid possible unbalances in the output of the heat emitters
with high outside temperatures (intermediate seasons).
D e s i g n O u t s i d e
T e m p : – 5 . 0 c
23.
2 -
24.
2
D e s i g n F l o w
T e m p : 7 0 . 0 c
23.
3 -
24.
3
C u r v e O r i g i n T O 2 0
F l o w T : 2 0 . 0 c
23.
4 -
24.
4
11. OPERATION
XTE 602 is a digital controller with microprocessor for :
– compensated control, with or without ambient authority, of two heating zones. Three-wire control
of motorised valves and On-Off control of circulation pumps.
– the acquistion of status and / or alarms regarding plant components
To configure the controller, please see “18. SEQUENCE OF DISPLAY PAGES”
12. HEATING ZONE
12.
1
Type of installation
The controller must be configured according to the type of heating zones controlled:
• Type heat emitters : RADIATORS
PANELS
FAN COILS
12.
2
Heating control curve
For each heating zone controlled, the flow temperature requested by the controller (detector B1 and
B5) is adjusted according to the outside temperture (detector B2 or value transmitted via C-Ring)
and to the heating control curve .
The controller compares the actual value of the flow temperature with the corresponding one on the
curve, and, in the event of a difference, regulates with PI control action (pre-set proportional band
Pb and integral time It), the motorised valve to eliminate it.
The heating control curve , having reference to to a desired ambient temperature of 20 °C, is esta-
blished, for each heating zone, by :
H e a t E m i t t e r s
R A D I A T O R S
23.
1 -
24.
1
