7
B 242 - XTE 602 Eng. C1
22.11.10 AM
REV. 02
We reserve the right to make changes witout notice
COSTER
12.
10
Operating mode and adjustment of temperature
The modes in use depend on the programmes set in
and
and can be seen on the two pages of the display :
• NORMAL
Td - -.- c
SETBACK
Td - -.- c
FLOW
Td - -.- c
FROSTPROT Td - -.- c
OFF
ECO OFF
In the NORMAL / SETBACK operating modes it is possible to adjust the value of the desired
temperature :
•
Var +
= variation of ± 3°C
12.
11
Modifying programmes by remote control
The remote control R (CDB300) can be configured to act on a single heating zone or on both heating
zones controlled :
– NO
= remote control excluded
– ZONE 1
= modifications by remote control affect only zone 1
– ZONE 2
= modifications by remote control affect only zone 2
– ZONES 1 & 2 = modifications by remote control affect both zones
The remote control permits selecting at a distance the operating programmes :
– OFF
= plant excluded
– FROSTPROT = continuous operation at desired Frostprot ambient temp.
– NORMAL
= continuous operation at desired Normal 1 ambient temp.
– SETBACK
= continuous operation at desired Setback 1 ambient temp.
– TAd +2c
= increase of 2 °C in temp. desired by mode in use
– AUTOMATIC
=operation with programme chosen for controller
12.
12
Control zone pump
The heating zone pumps can be controlled in two ways :
• MAN = Pump in continuous operation (always On)
AUT = Pumps M1 and M2 controlled according to modes in use :
– Off
: pump always Off
– Eco Off
: pump always Off
– Extension : pump always On
– Normal
: pump always On
– Setback, Frostprot & Optimum Stop :
pump Off after Optimum Stop .
Pump On when actual or calculated ambient temperature is below
calculated flow temperature
– Boosting : pump always On
– Flow
: pump always On
• Delay Off : 2 min = delay time in switching off to dissipate heat accumulated in plant
12.
13
Metering degree-days
For each zone controlled XTE 602 meters degree-days in two ways
• 20 = metering of degree-days with reference to conventional ambient temperature of 20 °C
• Amb = metering of degree-days with reference to the actual ambient temperature (with de-
tector B3 or B6) or to that calculated (without B3 or B6)
19.
4
M o d e 1 : N O R M A L
T d 2 0 . 0 c V a r + 0 . 0 c
23.
16 -
24.
16
H e a t i n g P u m p : A U T
D e l a y O f f : 3 0 m i n
19.
5
M o d e 2 : N O R M A L
T d 2 0 . 0 c V a r + 0 . 0 c
H t g 1 : - - - - - - - - - -
2 4 H O U R 1
19.
2
H t g 2 : - - - - - - - - - -
2 4 H O U R 1
19.
3
25.
4
E n a b l e R e m o t e
N O
22.
7 -
22.
8
D e g r e e - D a y s
2 0 : x x x x A m b : x x x x
13. OPTIMISATION
Start and stop at variable times so as to obtain desired ambient temperatures in coincidence with
times of start and end of occupancy.
Useful for buildings with discontinuous occupancy such as schools and offices.
The method of establishing the time of optimised start depends on the presence or not of the am-
bient detector.
13.
1
Optimisation with ambient detector
The start time, for both heating zones controlled, is established by the meeting point of the descending
curve of the actual ambient temperature, with plant OFF or in the SETBACK / FROSTPROT mode,
and the ascending curve of ambient temperature, defined by the parameter “Start inertia .”
With “Start inertia “ on AUTOMATIC : if the desired ambient temperature is obtained too soon or too
late in respect of the time required, the controller adjusts the start time for the following day by ± 15
minutes until the desired time is obtained.
13.
2
Optimisation without ambient detector
“Start inertia ” set on MANUAL : the start time is established by the controller on the basis of the
“Cooling time constant ” (23.
13 -
24.
13
)
