HERZ laying system

HERZ control
• Digital timer with weekly and
yearly program
• Programmable input function,
• two Triac outputs and a relay with
operating hours counter Instead
of function “circulation pump” the
relay can be used as a pilot clock
Safety function if valve or pump seal is stuck
Manual operation of valve and pump
Housing made of clear white noninflammable
plastic (RAL 9010)
Easy installation, surface and flush
mounting possible
Electrical connection in socket with screw
clamps for cables with a maximum length of
2.5 m, cable entry from behind, electronics
in housing
Functions as a room temperature controller:
- Heating and cooling
(4-cable model)
- Cooling (2-cable model).
Connection of two thermal actuating drives
for heating and cooling operation.
Connection of a thermal actuating drive for
cooling operation.
Additional in/out control for pump or fan.
Time switch with weekly program
(42 switching commands) and yearly
program (6 switching commands)
Example:
Room control for cooling two-pipe
equipment with internal temperature
sensor and dew point monitoring or
external temperature sensor, slide for room
temperature target value and 2-point output
Example:
Connection plan, 230 V version,
1 7794 23
Connection plan, 24 V version,
1 7794 24
Advance flow temperature control
(cascade) for cooling, e.g. cooling
ceilings with internal temperature sensor
and dew point monitoring or external
temperature sensor
HERZ room temperature
controller
Herz 7791 room temperature controller
is easy to use.
The 7791 from Herz is an intelligent digital
temperature controller for
- Living rooms
- Practice rooms
- Offices
- Apartments
- Detached houses.
It provides comfort control while reducing
the temperature during the night and
increasing it during the day. It independently
operates valves, pumps, burners and other
heating or cooling equipment.
Advantages of this room thermostat:
3 temperature levels, individually
programmable for each day of the week
Weekly and holiday period program
Housing with easy to read symbols Easy
operation with only 5 keys
Highest engineering technology can be
found inside this modern and well-designed
thermostat. The 7791 has 3 temperature
levels to provide the most comfortable and
efficient room temperature control with
2 point and variable control characteristic.
The display for the functions of the system
is with common and easily understood
symbols. The temperature is digitally
displayed with eco metre (now and relative
energy consumption)
The 7791 is available for battery operation
with 2-wire connection and for mains circuit
operation with 4-wire connection. The
desired individual temperatures can be
set using the standard programme. The
set programmes are retained if the power
is lost during a power cut. Additionally the
programme can be set for unlimited and
limited periods (e.g. parties, holidays) from
2 hours to five days with the remaining
time displayed. Obviously the 7791 comes
with automatic switch between summer
and wintertime, frost protection in stand by
mode and safety function if the valve and
pump seal is stuck.
With its control qualities and simple
operation it is suitable for
- Controls and actuating drives
- Underfloor and radiator heating
- Burners for oil and gas boilers
- Circulating pumps
- Fans in storage heater units
- Heat pumps or gas units
Order no. 1 7791 23, 230 V version
Order no. 1 7794 02, 3 V version
30
Room heating and cooling for floors, walls and ceilings