Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 51

Electrical connection
Plug sYA
Terminals Function
211.2 Secondary pump
1.
211.5 Cooling control
AC 3-way diverter valves for
heating water buffer cylinder
bypass in cooling mode
Plug sYS
Terminals Function
212.2 Heating circuit pump for
heating circuit without mixer
A1
(A1/HC1)
212.3 DHW circulation pump
(cont.)
Explanation
■ In systems without a heating water
buffer cylinder, no other heating circuit
pump is required (see terminal 212.2).
■ Connect temperature limiter as maxi-
mum temperature limiter for underfloor
heating circuit (if installed) in series.
Connection values
■ Output: 130 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Secondary pump connected at the fac-
tory; the temperature limiter must be
connected on site.
Connection values
■ Max. output: 10 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Connect the 3-way diverter valves for the
bypass circuit in parallel.
Explanation
■ This pump is connected in addition to
the secondary pump if a heating water
buffer cylinder is installed.
■ Connect temperature controller as a
maximum temperature limiter for un-
derfloor heating circuit (if installed) in
series (see 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
Installation sequence
51