Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 126

Function description
External extensions (accessories)
Central fault message/feed pump/DHW circula-
aBJ
tion pump (potential-free)
Connect DHW circulation pumps with stand-
alone functions directly to the 230 V
KM BUS
aVG
Digital data inputs DE1 to DE3
The following functions can be connected alternatively:
■ External operating program changeover for each
heating circuit
External blocking
■
■ External blocking with fault message input
■ External demand with minimum boiler water temper-
ature
■ Fault message input
■ Brief operation of the DHW circulation pump
External contacts must be floating. When making the
connection, adhere to the requirements of protection
class II: 8.0 mm air and creep paths and 2.0 mm insu-
lation thickness against 'live' components.
Input function assignment
Select the input functions by means of codes in the
"General" group at the boiler control unit:
■ DE1: Coding address 3A
■ DE2: Coding address 3b
■ DE3: Coding address 3C
Assigning the operating program changeover
function to the heating circuits
Select the operating program changeover function for
the respective heating circuit via coding address d8 in
the "Heating circuit" group 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
The effect of the operating program changeover is
selected via coding address d5 in the "Heating cir-
cuit" group.
The duration of the changeover is set via coding
address F2 in the "Heating circuit" group.
Effect of external blocking function on the pumps
The effect on the internal circulation pump is selected
in coding address 3E in the "General" group.
The effect on the relevant heating circuit pump is
selected in coding address d6 in the "Heating circuit"
group.
The effect on a circulation pump for cylinder heating is
selected in coding address 5E in the "DHW" group.
126
(cont.)
∼
supply.
Effect of the external demand function on the
pumps
The effect on the internal circulation pump is selected
in coding address 3F in the "General" group.
The effect on the relevant heating circuit pump is
selected in coding address d7 in the "Heating circuit"
group.
The effect on a circulation pump for cylinder heating is
selected in coding address 5F in the "DHW" group.
DHW circulation pump runtime for brief operation
The DHW circulation pump is started by closing the
contact at DE1, DE2 or DE3 by means of a pushbut-
ton. The runtime is adjusted via coding address "3d" in
the "General" group.
Analogue input 0
The 0 10 V hook-up provides an additional set boiler
–
water temperature:
0 1 V is taken as "no set boiler water temperature
–
default".
≙
1 V Set value 10 °C
≙
10 V Set value 100 °C
Ensure DC separation between the earth conductor
and the negative pole of the on-site voltage source.
Output
aBJ
The following functions can be connected to output
aBJ :
■ Feed pump to substation
or
DHW circulation pump
■
or
Fault message facility
■
Information regarding the feed pump
Function only possible in conjunction with a heating
circuit control unit connected via LON.
Information on DHW circulation pumps
Connect DHW circulation pumps with standalone func-
tions directly to the 230 V ∼ supply.
Function assignment
Select the function of output
"36" in the "General" group at the boiler control unit.
10 V
–
via coding address
aBJ