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HC4695
HS4695
L4695
N4695
NT4695
AM5875HD4695
BUS
Circulation pump
In addition to controlling the zone valves, for some types of systems it will also be
necessary to control one or more water circulation pumps. When programming the
operating mode of the circulation pumps is not necessary to connect any special
congurators: it will be sucient to use the central unit through the “Pump” item; inside
the “Maintenance” menu, select the zones that must be served by a circulation pump.
Using the programming procedure, set a logic link between the zones, and the pump
that hydraulically supplies them. To complete the programming procedure, the pump
management mode must also be selected, thus dening if the pump supplies a heating,
a cooling, or a combined system. Depending on the needs of the hydraulic system, one
“circulation pump” or “several circulation pumps” may be installed, to supply one or more
zone groups. If necessary, it is also possible to set a “pump switch-on delay”, in relation
to the opening of the zone valves. In the following cases, pump control is not necessary,
or needed:
- in systems where the pump is always in operation (thanks to water recirculation
hydraulic systems, or the presence of three-way valves);
- in systems where the pump is managed automatically (it comes on by itself when
water is required, and turns o again when all valves are closed);
- in systems where the pump has simply not been installed (for example for air
conditioning units or electric heating control).
System with a circulation pump
The system shown only has one circulation pump, that only supplies two zones, controlled
by two solenoid valves. The pump is managed by a dedicated actuator congured in zone
00. In the same way as the pump, also the two valves are controlled by two dierent
actuators. The circulation pump will remain active until at least one of the two valves
remains open and will stop when both valves are closed.
4 zone central unit calibration
The 4 zone central unit does not normally require calibration: however, in particular
installation situations (perimeter walls, north or south facing walls, when close to heat
sources, etc.), the temperature value measured may be corrected using the appropriate
calibration function, which can be found in the central unit menu.
Before performing the calibration operation, ensure the following:
• leave the 4 zone central unit connected and powered with the hydraulic system o for
at least 2 hours. During this time, avoid any changes in the room temperature (e.g. by
opening or closing windows, doors, etc.), and avoid standing near it;
• for the calibration use a calibrated sample thermometer, correctly positioned inside
the room.
Note: For more details on the calibration procedure and the programming operations
using the central unit, refer to the installation manual of the central unit.
Legend
1. Circulation pump
2. pump actuator
3. zone 1 solenoid valve
4. zone 1 actuator
5. zone 2 solenoid valve
6. zone 2 actuator
ZONE 1
ZONE 2
4-zone central unit
MQ00178-c-EN 29/04/2014