117
Digital data inputs DE1 to DE3
The following functions can be connec-
ted alternatively:
■ External heating program changeover
for each heating circuit
■ External blocking
■ External blocking with fault message
input
■ External demand with minimum boiler
water temperature
■ Fault message input
■ Short operation of the DHW circulation
pump
The hooked-up contacts must corre-
spond to protection class II.
Input function assignment
Select the input functions via the codes
on the boiler control unit:
■ DE1: Code 3A
■ DE2: Code 3b
■ DE3: Code 3C
Assigning the heating program
changeover function to the heating
circuits
Assign the heating program changeover
function for the respective heating circuit
via code d8 at the boiler control unit:
■ Changeover via input DE1: Code d8:1
■ Changeover via input DE2: Code d8:2
■ Changeover via input DE3: Code d8:3
Select the effect of the heating program
changeover via code d5:
Set the duration of the changeover via
code F2.
Effect on the pumps of external block-
ing function
The effect on the relevant heating circuit
pump is selected with code d6.
The effect on a circulation pump for cyl-
inder heating is selected with code 5E.
Effect on the pumps of the external
demand function
The effect on the relevant heating circuit
pump is selected with code d7.
The effect on a circulation pump for cyl-
inder heating is selected with code 5F.
DHW circulation pump runtime for
brief operation
The runtime is set in code 3d.
Analogue input 0 - 10 V
The 0 - 10 V hook-up provides an addi-
tional set boiler water temperature:
0 - 1 V taken as "no default set boiler
water temperature".
1 V
≙
set value 10 °C
10 V
≙
set value 100 °C
Output
aBJ
The following functions can be connec-
ted to output
aBJ
:
■ Feed pump to substation
or
■ DHW circulation pump
or
■ Fault message facility
Function description
External extension (accessory)
(cont.)
5692 860 GB
Summary of Contents for CU3A
Page 147: ...147 5692 860 GB ...
