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Les langues disponibles
ENGLISH
1. GENERAL
1.1 Applications
For hot-water heating installations. The electronic
differential pressure monitoring system makes it
possible to adapt the flow and differential pressure
characteristics of the circulator to the needs of the
installation at all times (less flowing-water noise, energy
savings through optimum efficiency, equalization
valves simpler to adjust).
The NXT circulators are recommended for home
central heating installations with thermostat valves.
1.2 Specifications
•Min. liquid temperature
Max. ambient temperature
Water temperature
•Max. service pressure
•Min. suction pressure :
(m w.g.)*
•Antifreeze (glycol + water) : up to 50%
(no other liquid without approval in advance)
•Capacity
NXT 33-25 : 3 m
•Capacity
NXT 53-32 : 5 m
*(10.2 m.w.g. = 1 bar).
2. SAFETY
Read this data sheet carefully before installing and
starting up. Pay special attention to the points
concerning the safety of the equipment for the
intermediate or end user.
2.1 Symbols used in the manual
Security instruction : non respect can induce
injury.
Electrical security instruction : non respect can
induce injury.
Security instruction : non respect can
ATTENTION !
be induce material damages.
3. TRANSPORT AND STORAGE
When taking delivery of the equipment, check that it
has not been damaged in transit. If anything is found
wrong, take the necessary steps with the carrier within
the allowed time.
If the equipment delivered is to be
ATTENTION !
installed at a later time, store it in a dry
place and protect it from impacts and outside
influences (moisture, frost, etc.).
: 20 °C
25 °C
40 °C
110 °C
95 °C
: 10 bars
: 1.5 m (0.15 bar) at + 82°C
: 3 m (0.3 bar) at + 95°C
: 10 m (1 bar) at + 110°C
3
/h
3
/h
4. PRODUCTS AND ACCESSORIES
4.1 The pump
Threaded ports.
The motor has a wet rotor, the bearings are self-
lubricating.
The terminal box countain the control electronics.
• Conformity
• Insulation class
• Protection
The motor is self-protected by impedance and needs
no external protection.
4.2 Functions of the NXT system
The circulator is electronically self-regulated; after
adjusting the settings, it adapts to the developing
needs of the installation.
- continuously adjustable differential pressure with the
C potentiometer (see FIG. 3).
adjustability (see FIG. 2).
HMT
(33-25) :
HMT
(53-32) :
Potentiometer position
Control modes
• Comfort E E
For a setting established by the installer, differential
pressure is proportional over 25% and constant over
75% of the maximum authorised flow-rate (see FIG. 4).
This system provides the following benefits :
- Reduction of the noise caused by excess flow or an
excess pressure at low flow-rate (in the case where
the installation is equipped with thermostatically
controlled valves) (see FIG. 1).
- Energy saving.
- Increased longevity.
This mode is compatible with an installation including
the production of instant hot water.
• Auto E E / Y Y
This mode follows exactly the operating principle of
the comfort mode.
This mode follows exactly the operating principle of
the comfort mode.
In addition, an integral temperature sensor enables
the electronics to switch the circulator onto a reduced
differential pressure curve (standby) following the
detection of a sudden fall in the temperature of the
installation (extra energy saving and increased
comfort) (see FIG. 5). Switching will occur about 30
minutes after the temperature fall has been detected.
Return to the initially set differential pressure curve
occurs about 5 minutes after the temperature rise has
been detected.
This mode is compatible with :
7
: TF 110
: F (155 °C)
: IP 42
0.5 m
3 m
1 m
5 m
:
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