Viessmann BWT 241.A Series, Installation And Service Instructions Manual

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41
Message and safety connections
Terminals
Function Explanation
F1 Heat pump control unit
fuse 6.3 A (slow)
X3.1 Phase switched. Via control unit ON/OFF switch.
Note
Observe the total load (1000 W) of all con-
nected components.
X3.3
X3.4 Flow limiter, well circuit. Floating contact required:
■ Closed: Heat pump in operation
■ Open: Heat pump shut down
■ Breaking capacity 230 V, 0.15 A
Connect on site; remove jumper when con-
necting.
X3.6
X3.7
G
Power-OFF (factory-fitted
jumper). Floating contact required:
■ Closed: Heat pump in operation
■ Open: Heat pump shut down
■ Breaking capacity 230 V, 0.15 A
Connect on site; remove jumper when con-
necting.
Note
■ No parameters need to be set.
■ The compressor is "forced" off as soon
as the contact opens.
■ The supply voltage to the relevant func-
tion component is switched off by the
power-OFF contact signal.
■ For the instantaneous heating water
heater, the stages to be switched off can
be selected (parameter "Output for
instant. heating water heater at
power-OFF 790A").
■ For further information regarding power-
OFF, see chapter "Power supply".
Installation sequence
Electrical connection
(cont.)
5601 598 GB
Installation