Product Information - Viessmann VITOCAL 300-A Installation And Service Instructions Manual

Preparing for installation

Product information

Vitocal 300-A, type AWC-I-M
Air-water heat pump with integral circulation pump (secondary pump), three-
way diverter valve, safety assembly and diaphragm expansion vessel.
Vitocal 300-A, type AW-O-M
Air-water heat pump without integral circulation pump (secondary pump) and
without three-way diverter valve. A secondary pump group (secondary pump
and circulation pump for cylinder heating) is available as an accessory.
The four red cores in the control unit must be removed for the external circula-
tion pumps to be connected (see page 79).
General information regarding electrical connection
& The total output of all components
connected directly to the control unit
(e.g. pumps, valves, message facil-
ities, contactors) must not exceed
1000 W.
If the total output ≤ 1000 W, the indi-
vidual rating of a component (e.g.
pump, valve, message facility, con-
tactor) can be greater than speci-
fied.
& If two components are connected to
the same terminal, press both cores
together into a single wire ferrule.
8
& If the compressor and/or instanta-
neous heating water heater (acces-
sories) are operated at a lower tariff
(power-OFF), provide an additional
cable for the power-OFF signal (e.g.
2
NYM 3 x 1.5 mm ) from the distribu-
tion board (meter box) to the heat
pump control unit (see page 98).
& The number of power supply cables
from the distribution board (meter
box) to the control unit and heat
pump (control panel) depends on
the system version and tariffs used.
& The KM BUS wires are interchange-
able.
For further information see control
panel (page 66), control unit
(page 70) and power supply connec-
tion (page 95).