Viessmann Vitocal 350-A AWHI 351.A14, Installation And Service Instructions Manual

Page: 48 / 140

48
Plug sYS
Terminals Function Explanation
212.2
A1
Heating circuit pump for heating cir-
cuit without mixer A1/HC1
■
If a heating water buffer cylinder is installed, this
pump will be installed in addition to the secondary
pump.
■
Connect temperature limiter to restrict the maximum
temperature for underfloor heating systems (if instal-
led) in series: See the following chapter.
Connection values:
■
Output: 100 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
212.3 DHW circulation pump Connection values:
■
Output: 50 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
212.4 3-way diverter valve for heating water
buffer cylinder bypass or heat pump
in the case of dual alternative mode Connection values
■
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
Connecting a temperature limiter as a maximum temperature limiter for underfloor heating
Connecting a general temperature limiter
B
M
1~
C
B
X2.N
?
A
X1.
Fig. 47
Connecting the temperature limiter, part no. 7151 728,
7151 729
B
M
1~
C
B
sÖ
X2.N
?
A
X1.
Fig. 48
Connection
A
to con-
trol unit
Circulation pump
C
Heating circuit without mixer A1/HC1
■
Without heating water buffer cylinder 211.2 Secondary pump
■
With heating water buffer cylinder 212.2 Heating circuit pump A1/HC1
Heating circuit with mixer M2/HC2 225.1 Heating circuit pump M2/HC2
Installation sequence
Heat pump control unit electrical connections
(cont.)
5692878
Installation