Connection Of On-Site Control Units To Ea1 Extension In Single Boiler Systems - Viessmann VITOCROSSAL 200 Type CM2 Technical Manual

Control units
(cont.)
External control with a modulating burner
A
9
B4 S3 T2 T1 N L
41
E
A Plug to the control unit
B Burner base load
(floating contact for switching 230 V~)

Connection of on-site control units to EA1 extension in single boiler systems

Control via 0 – 10 V input:
External demand via 0 – 10 V input
Connection to the 0 – 10 V input on the EA1 extension.
In conjunction with a two-stage or modulating burner.
Code "01:1" for single boiler system (delivered condition).
[{{] 0-10V aBJ
+ - S P Ö
­
U
+
The 0 - 10 V hook-up provides an additional set boiler water temper-
ature:
0 - 1 V is taken as "no default for set boiler water temperature".
≙ Set value 10 °C
1 V
≙ Set value 100 °C
10 V
VIESMANN
88
B
90
T6 T7 T8
f-] fÖ
A
L N N L
C T6, T7: Reduce burner output (modulation controller closed)
(floating contact for switching 230 V~)
D T6, T8: Increase burner output (modulation controller open)
(floating contact for switching 230 V~)
E Plug to the burner
Contact B at plug aBÖ closed
Burner on (base load). The on-
site modulation controller regu-
lates the load-dependent modu-
lation. The boiler water tempera-
ture is restricted by the electronic
maximum temperature limiter.
C
D
The set default range can be changed in code 1E:
≙ Set value 30 °C
1 V
10 V ≙ Set value 120 °C
Note
Ensure DC separation between the negative pole and the earth con-
ductor of the on-site voltage source.
Digital data inputs DE1 to DE3
Functions:
■ External blocking
■ External blocking with fault message input
■ Fault message input
The hooked-up contacts must correspond to safety category II.
Input function assignment
Select the input functions via the codes on the boiler control unit:
■ DE1: Coding address "5d"
■ DE2: Coding address "5E"
■ DE3: Coding address "5F"
Set flow temperature for external demand
■ The set flow temperature can be selected with code 9b.
Contact B at plug aBÖ open
Burner off.
Gas condensing boilers