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1 .4 General description
The heat pump heaters
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of the air to produce domestic hot water.
Ease of installation, noiseless and reliable operation and min-
imum maintenance requirements complete the advantages of
this highly ecological and economical system.
The unit is suitable for indoor installation and uses as standard
alternative energy source a 1.5 kW single-phase electric heating
element. The accumulation tank is made of carbon steel, with
internal 2-layer glazing, magnesium anode, internal coating in
rigid plastic material (ABS).
1 .5 Operating principle of the heat pump
The operating principle of the heat pump is the following:
− The refrigerating fluid changes its state in the evaporator
(1) taking heat from the low temperature source (the
external air).
− The compressor (2), that is the heart of the system, makes
the energy level of the taken heat higher: in fact, the
refrigerating fluid, by increasing its pressure, reaches
temperatures near to 90°C.
− In the condenser (3) it is possible to give thermal energy
to the domestic hot water, warming it until 60°C.
− The storage tank (4) (300 litres) allows storing up and
keeping for a long time the heat, thanks to insulating
shell in polyurethane 50mm thick.
− Crossing in the end the expansion element (5), the fluid
returns to low pressure, cools down and it is available
to "load" other "ecological" heat again from external air.
− the solenoid valve (6) allows to equalize pressures
during the starting phase and, if necessary, allows the
evaporator defrost.
1
4
3
1
Evaporator
2
Compressor
3
Condenser
4
Storage tank
5
Electronic expansion valve
6
Solenoid valve
NexPro Plus use the thermal energy
6
2
1 .6 Constructive characteristics
The main constructive features of the heat pump heaters
NexPro Plus are:
− carbon steel tank with double-layer glazing
− capacitor externally wrapped to the accumulation
tank free from limescale deposits and gas-water
contamination
− auxiliary coil for the use in combination with boilers
(NexPro 300 CS Plus) or solar panels (NexPro 300 S Plus,
NexPro 300 CS Plus)
− NTC integrated probe for the control of water temperature.
− NTC outdoor temperature sensor for automatic insertion
of the electrical heater with temperature not favourable
to the heat pump.
− evaporating coil input/output NTC probes
− electronic thermostatic valve
− solenoid valve for hot gas injection and pressure
equalisation
− anti-corrosion magnesium anode
− hydraulic connections on the back side
− condensate drain integrated in the isolation
− hermal insulation with injected polyurethane with high
thickness
− external coating in RAL 7001 grey plastic
− use of refrigerant gas R134A
− single phase 1.5 kW electrical heater
− safety devices for high pressure
− high efficiency rotary compressor
− variable speed radial fan
− support handles for easy and safe transport.
The management, fully electronic, is provided with:
− User interface for setting the operative mode and set the
parameters with different levels of accessibility protected
by password
− self-diagnosis and display of alarms (high pressure, high
temperature of water, probes disconnected)
− storage of runtime and clock function
− water set-point adjustment for automatic and/or manual
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operation
− outdoor air temperature display
− modulating fan speed control
− dynamic set point function
− management of minimum time intervals between
successive starts of the compressor
− remote ON/OFF for complete unit (timer)
− remote ON/OFF for electrical heater (energy twin rate)
− electrical heater management in manual or automatic
integration mode with low outdoor temperature
− command to an external boiler as an alternative to the
electric heating element
− insertion of the cyclic antibacterial treatment to eliminate
and prevent the formation of legionella
− defrost management through hot gas by-pass.
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GENERAL CHARACTERISTICS
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