Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 40

Installation sequence
Electrical connection
Plug
sYS
Terminals Function
212.3 DHW circulation pump
212.4 3-way diverter valve for heating water
buffer cylinder bypass or heat pump
in the case of dual alternative mode
Connecting a temperature limiter as a maximum temperature limiter for underfloor heating
Connecting a general temperature limiter
X2.N
X1.
?
A
B
M
C
1~
Fig. 37
Heating circuit without mixer A1/HC1
Without heating water buffer cylinder
■
With heating water buffer cylinder
■
Heating circuit with mixer M2/HC2
Connecting the temperature limiter, part no. 7151 728,
7151 729 to the mixer extension kit
B
A
N
?
sÖ
B
sÖ
M
C
1~
Fig. 39
Connect plug to the extension kit.
A sÖ
Temperature limiter
B
Heating circuit pump M3/HC3
C
40
(cont.)
B
Connection
trol unit
211.2
212.2
225.1
Explanation
Connection values
Output: 50 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connection values
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connecting the temperature limiter, part no. 7151 728,
7151 729
B
X2.N
X1.
?
A
B
M
C
1~
Fig. 38
to con- Circulation pump
A
Secondary pump
Heating circuit pump A1/HC1
Heating circuit pump M2/HC2
sÖ
C