Viessmann VITOCAL 350-A Installation And Service Instructions Manual page 53

Electrical connections: Heat pump control unit
Plug
sYA
Terminals Function
211.1 Fan
211.2 Secondary pump
211.3 Control of instantaneous heating wa-
ter heater, stage 1
1.
r
211.4 Circulation pump for cylinder heating
Plug sYS
Terminals Function
212.2 Heating circuit pump for heating cir-
cuit without mixer A1/HC1
A1
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
(cont.)
Explanation
Connection values:
Output: 200 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
In systems without a heating water buffer cylinder, no
■
other heating circuit pump is required (see terminal
212.2).
Connect the temperature limiter to restrict the maxi-
■
mum temperature for underfloor heating systems (if
installed) in series (see the following chapter).
Connection values:
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Connection values:
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
See installation instructions for instantaneous heating
water heater and switching module.
Connection values:
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Explanation
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
■
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
■
Installation sequence
53