Viessmann B2TF - Connecting the Circulation Pump to P2; Floating Switching Contact Connection; Checking the CAN Bus Terminator Switch Setting

22
Connecting the circulation pump to P2
B
A
1~
M
Fig. 13
A
Circulation pump
B
Plug P2 on HMU heat management unit
Possible functions:
■
Heating circuit pump for heating circuit without mixer
A1 in connection with low loss header and heating
circuits with mixer
■
DHW circulation pump
Connect DHW circulation pumps with standalone
functions directly to the 230 V∼ supply.
Information on priority of connection options:
■
If heating circuit pump for heating circuit without
mixer A1 is installed:
Connect heating circuit pump to output P2.
Then connect DHW circulation pump to an EM-P1
extension (accessories).
■
If no heating circuit pump for heating circuit without
mixer A1 is connected:
Connect DHW circulation pump to output P2.
The function is selected in the commissioning assistant
by selecting the connected component.
Specification
Rated current 1 A
Rated voltage 230 V ~
Floating switching contact connection
Connection at plug lH
One of the following functions can be connected:
■
External demand
■
External blocking
■
DHW circulation pump external demand (pushbutton
function, pump runs for 5 min). Not for
Vitodens 222-W.
■
Room temperature controller (room thermostat)
In conjunction with operating mode Continuous oper-
ation with room temperature controller (not for
Vitodens 3xx)
■
External heating circuit hook-up (if installed), see
page 111
Not for Vitodens 3xx.
A
lH
N
?
1
L
Fig. 14
A
Floating contact
Assigning functions in the commissioning assis-
tant
See commissioning assistant in "Commissioning".
Checking the CAN bus terminator switch setting
The CAN bus resistor is switched using switch A
in
the wiring chamber.
Installation sequence
Electrical connections (cont.)
6151778
Installation