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D 215 - RTR 684 C2 Eng. 14.06.00

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COSTER

13.2 Control with primary detector (B1 or B3) & flow detector (B2)

RTR 684 compares temperature measured by detector B1 or B3 with desired temperature of current

programme T°d and calculates

desired flow temperature

T°fd in relation to difference measured

and parameters set. :

•

Prop band : – – . – c

= proportional band Pb in ± °C of primary

control

•

Integ time : – – m

= integral time in minutes of primary control.

•

Min : – – c Max : – – C

= minimum and maximum limits of flow temp.:

establish range of proportional band of primary control (22.

9 - 22.13).

The controller compares temperature measured by flow detector B2 with value calculated T°fd and

adopts control action Y1 or E1 in relation to difference measured and parameters set.

•

Prop band : – – . – c

= proportional band Pbf in ± °C of flow control

•

Diff : – – . – c

= On-Off differential of stage ∆t° of flow control

13.3 Control output Y1

The control output of the primary control Y1 (1-2 ; 3-4) can be :

• Control :

MODULATING

= control valve by three-wire modulating actuator

ON-OFF DIFF

= On-Off control in two stages

MODULATING ,

enter :

– complete run time (open/closed) of valve actuator ; indispensable for correct control operation.

– dead band Db of modulating action : NARROW ; MEDIUM ; WIDE.

If ON-OFF DIFF, enter if necessary for electric device controlled :

– minimum start time of On-Off control

– minimum stop time of On-Off control

13.

4 Operating mode

You can set five temperatures

Desired Primary temp

1 ... 5

to be used in creating the four programmes of timed events 24HOUR 1 ... 4

PRI

which in turn are used for creating the 7-day programme 7DAY PRI.

It is possible to programme the operation of the primary control according to the requirements of

the zones :

–

7DAY PRI

= operation with timed events using 7-day prog.

– 24HOUR 1 …4 PRI

= operation with timed events using one of four 24-hour progs.

– TEMP 1…5

= continuous operation using one of five desired temperatures.

– OFF

= always Off

when in place of programme appears :

–

REMOTE TEMP 1…4

= remote control R is in “Temperature 1 ... 4” position.

–

REMOTE OFF

= remote control R is in “Off” position.

The current

operational mode

depends on the programme set.

Con t r o l :

MODULAT I NG

22.1

Ac t ua tor run t ime

630sec

22.2 - 22.8

Minimum star t

time : 60s

22.6 - 22.16

Minimum stop

time : 60s

22.7 - 22.17

Prop band : 10 . 0c

Integ time: 10m

22.9 - 22.13

Con t r o l f l ow

Min: 1c Max:99c

22.11 - 22.15

Flow temp

Prop band : 10 . 0c

22.10

Dead band

NARROW

22.4 - 22.12

Flow temp

Di f f :10.0c

22.14

Con t r o l :

MODULAT I NG

22.1

Con t r o l :

ON-OFF DI FF

22.1

19.2

Pri:------------

24HOUR 1 PR IMARY

Des i r ed Pr imar y

temp 1 20.0c

20.1 - 20.5

t°

T°

–

T°f

max.

T°f

min.

T°

∆t°

off

–

∆t°

off

E1.

t°f

T°f

t°

100%

–

50%

T°

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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