Signal Effects - Viessmann VITOTRONIC 200 Service Instructions Manual

Function description
External hook-up for heating/cooling circuits
Enabling this has the following effects on the functions
of the heat pump control unit:
■ The time programs for central heating/cooling for the
relevant heating/cooling circuit are disabled. The
other time programs are active, e.g. "Time program
DHW".
The set room temperatures for the individual heating
■
circuits are "Standard room temperature 2000,
3000, 4000".

Signal effects

Central heating/cooling is switched on permanently
regardless of the heating limit and cooling limit: See
chapters "Heating limit" and "Cooling limit".
Set flow temperatures
The set flow temperature for a heating circuit compri-
ses the heating/cooling curve set for this heating circuit
and the value set for "Standard room temperature
2000". If demands for central heating are issued by
several heating circuits at once, the highest set flow
temperature is used in the secondary circuit flow.
Power-OFF
Frequently, economy tariffs for electricity include an
agreement that the electrical supply for compressors
and instantaneous heating water heaters can be sus-
pended by the power supply utility several times each
day. The heat pump control unit receives the power-
OFF signal via terminals X3.6/X3.7 on the cross con-
nect PCB or luster terminals (floating contact required).
To safeguard the remaining functions of the heating
system during the power-OFF period, the power sup-
ply of the heat pump control unit must not be switched
off. The heat pump control unit must therefore be con-
nected to an unblockable power supply.
Connection versions
■ Without on-site load disconnect:
The compressor is shut down by the heat pump con-
trol unit. The instantaneous heating water heater (if
installed) can remain in operation ("Output for
instant. heating water heater at power-OFF
790A").
The power OFF signal is only connected to the lead
heat pump in heat pump cascades.
With on-site load disconnect:
■
The compressor and instantaneous heating water
heater are "forced" OFF.
With heat pump cascades, the power-OFF signal is
connected to all heat pumps in parallel and in the
same phase via a contactor relay.
34
(cont.)
External functions are not available: External
■
demand, operating status changeover, external
blocking
■ Smart Grid is only possible via the EA1 extension
("Enable Smart Grid 7E80" set to "1"), not via the
digital inputs on the main PCB ("Enable Smart Grid
7E80" set to "4").
Operation via remote control not possible
■
■ Integration into Vitocomfort 200 not possible
Note
If demands for central heating and cooling are present
simultaneously, the demand for central heating takes
priority.
Note
The power-OFF signal must not be connected in the
following cases:
■ In conjunction with a photovoltaic system (utilisation
of power generated on site)
In connection with Smart Grid
■