Viessmann Vitocal 252-A Series - Page 74

74
Functions Switching contacts Explanation
143.2 143.3 143.4 143.5
External blocking X — — — External blocking of refrigerant circuit and instantane-
ous heating water heater
143.2
A
143.1
A
Floating contact (on site)
Heating/cooling
circuits tempera-
ture limiter 1
X — — — Temperature limiter to restrict the maximum tempera-
ture of underfloor heating circuits
143.2 143.3
A
B
143.1
A
Temperature limiter heating/cooling circuit 1
B
Temperature limiter heating/cooling circuit 2
Temperature lim-
iter heating/cool-
ing circuit 2
— X — —
Electrical connections
Electrical connection of the indoor unit (cont.)
6222080
Installation