Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 73

Electrical connections in the heat pump control...
Plug sYA
Terminals Function
211.5 Cooling control
NC function control (natural
cooling)
NC/AC
Plug sYS
Terminals Function
212.1 Cooling control
AC function (active cooling)
AC AC
212.2 Heating circuit pump for
heating circuit without mixer
A1
(A1)
212.3 DHW circulation pump
212.4 Solar circuit pump with high
limit safety cut-out (max.
95 °C) for DHW cylinder
(only with internal solar con-
trol function)
Installation sequence
Explanation
Circuit on site
Connection values
■ Output: 10 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Explanation
Circuit on site
Connection values
■ Output: 10 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
■ This pump is installed in addition to the
secondary pump if a heating water
buffer cylinder is connected.
■ Connect temperature limiter as maxi-
mum temperature limiter for underfloor
heating circuit (if installed) in series
(see the following chapter)
Connection values
■ Output: 100 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Connect on site.
Connection values
■ Output: 50 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Connect on site.
Connection values
■ Output: 130 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Connect on site, connecting high limit
safety cut-out in series with solar circuit
pump.
(cont.)
73