Viessmann B2HF - Connecting the Low Loss Header Sensor ); Connecting the Cylinder Temperature Sensor; Connecting the Circulation Pump to P1 and P2; Floating Switching Contact Connection

26
Connecting the low loss header sensor )
The sensor of the low loss header is connected to the
accessory extension EM-P1 or EM-M1/MX (ADIO elec-
tronics module) respectively.
See installation instructions for extension EM-P1
or EM-M1/MX
Connecting the cylinder temperature sensor
Connect the cylinder temperature sensor to terminals 3
and 4 on external plug
C
. See page 24.
Connecting the circulation pump to P1 and P2
Note
Observe the priority of the connections.
B
A
1~
M
Fig. 16
A
Circulation pump
B
P1/P2 plug on HMU heat management unit
Possible connections to P1 and priority of connections:
1. Circulation pump for cylinder heating
2. If no circulation pump for cylinder heating is present:
Heating circuit pump for heating circuit without mixer
A1 in connection with low loss header and heating
circuits with mixer
Possible connections to P2 and priority of connections:
1. Heating circuit pump for heating circuit without mixer
A1 in connection with low loss header and heating
circuits with mixer
2. If no circulation pump for heating circuit without
mixer is present:
DHW circulation pump
Note
If a heating circuit pump for heating circuit without
mixer is installed, connect the DHW circulation
pump to the P1 extension (accessories).
Connect DHW circulation pumps with standalone
functions directly to the 230 V
∼
supply.
The function of connections P1 and P2 is selected in
the commissioning assistant by selecting the connec-
ted component in the system scheme.
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 120
Not for Vitodens 3xx.
A
lH
N
?
1
L
Fig. 17
A
Floating contact
Installation sequence
Electrical connections (cont.)
5593201
Installation