Viessmann Vitocal 300-G Series Installation And Service Instructions Manual page 30

Installation sequence
Electrical connection
Terminals Function
X3.8
X3.9
Pressure switch, primary circuit
P
and/or
Frost stat
or
Jumper
X3.10 Fault message, lag heat pump in a
X3.11 cascade
or
Jumper
X3.12 "External demand" signal: External
X3.13 starting of compressor and pumps,
mixer in control mode or OPEN,
changeover of the operating status of
several system components
X3.17 Fuse F1 6.3 A (slow)
X3.18
X3.18 Heat pump control unit power supply:
Phase L1
X1.1 Earth conductor connection
X2.1 Neutral conductor connection
30
(cont.)
Explanation
Note
No parameters need to be set
■
No jumper should be installed if a power-OFF contact
■
is connected.
The compressor is "forced" off as soon as the contact
■
opens.
The power-OFF signal switches off the power supply
■
to the relevant components, subject to the power sup-
ply utility.
For the instantaneous heating water heater, the
■
stages to be switched off can be selected ("Output
for instant. heating water heater at power-OFF
790A").
The power supply for the heat pump control unit
■
2
(3 x 1.5 mm ) and the cable for the power-OFF signal
can be combined in a single 5-core cable.
In connection with Smart Grid:
Do not connect the power-OFF signal.
Do not remove jumper.
Requires floating contact:
Closed: Safety chain has continuity
■
Open: Safety chain interrupted; heat pump shut down
■
Breaking capacity 230 V~, 0.15 A
■
Connected in series if 2 safety components are instal-
■
led
Insert jumper if no safety components are instal-
■
led.
Requires floating contact:
Closed: No fault
■
Open: Fault
■
Breaking capacity 230 V~, 0.15 A
■
No jumper should be installed if a message contact is
connected.
Requires floating contact:
Closed: Demand
■
Open: No demand
■
Breaking capacity 230 V~, 2 mA
■
Note
These and further external functions (e.g. provision of
external set values) can alternatively be connected via
the external EA1 extension.
See "EA1 extension" installation instructions
Power supply 230 V~