LEGRAND 3440 - Page 335

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HD4693
HC4693
HS4693
L4693
N4693
NT46935739 21 (Magnesium)
067458
5739 20 (White)
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:
- 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).
Pump switch-on delay
If necessary, it is also possible set the circulation pump to activate after a certain time
delay, in relation to the opening of the zone valves. This selection depends on the type
of valve installed, and enables the pump to only activate once the valve is fully open. If a
time delay of 4 minutes is set, after closing the relay controlling the opening of the zone
valve, the probe will wait 4 minutes before switching the pump on. A maximum delay
of 9 minutes can be set, depending on the time needed for the valve to open. For the
opening times refer to the ocial technical specications issued by the solenoid valve
manufacturer.
NOTE: for details of the programming operations to be performed from the central unit
refer to the installation manual supplied with the central unit itself.
Probe calibration
Probes don’t 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 probes 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 them;
• 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.
Probe without selector
MQ00180-c-EN 29/04/2014