Refrigerant Circuit; Frame; Hydraulic Components; Safety And Control Components - AERMEC VENICE Manual Del Usuario

3. 1

REFRIGERANT CIRCUIT

Compressor
Scroll and rotary high-efficiency type, on
rubber anti-vibration mounts, activated
by a 2-pole electric engine with internal
heat protection.
Heat exchanger (external circuit)
Plate type (AISI 316). The heat pump
versions are externally insulated in
order to reduce heat dispersion and
condensation.
Heat exchanger (utility circuit)
Plate type (AISI 316). It is insulated
externally using closed cell material in
order to reduce heat dispersion and to
prevent the formation of condensation.
Dehydrator filter
Mechanical and realised in ceramics
and hygroscopic material, able to hold
impurities and any traces of humidity
present in the cooling circuit.
Thermostatic valve
Mechanical valve with external equaliser
positioned at the exit from the evaporator,
it modulates the flow of gas to the
evaporator depending on the heat load
in a way to ensure a correct degree of
overheating of the intake gas.
Cycle reverse valve
heat pump only
Reverses the flow of refrigerant on
variation of the summer/winter mode
and eventually during defrosting cycles.
Non-return valve
Allows the passage of the refrigerant in
just one direction.
3.2

FRAME

Support structure
Realised in hot galvanised sheet steel with
suitable thickness. It is painted using
polyester powders that are able to resist
atmospheric agents through time.
3.3

HYDRAULIC COMPONENTS

Circulation pump (circulator)
Flow meter
Positioned upstream from the utility
side evaporator, it checks that there is
circulation of water. On the contrary, it
blocks the unit.
Water filter
Allows to block and eliminate any
impurities present in the hydraulic
circuits. It contains a filtering mesh with
holes that do not exceed one milimeter
in size.
It is indispensible in order to prevent
serious damage to the plate heat
exchanger.
Storage tank
Used to decrease the number of
compressor peaks and uniform the
temperature of the water to send to the
utilities.
Capacity 23 lt.
Relief valve
Automatic, it discharges any air pockets
present. It is intercepted by a tap in order
to facilitate its eventual replacement.
Hydraulic circuit safety valve
Calibrated at 6 bar and with conveyorable
discharge. It intervenes by discharging the
over-pressure in the case of anomalous
pressures.
3.4 SAFETY AND CONTROL
COMPONENTS
Low pressure pressure switch
(not present in heat pump versions).
With fixed calibration, positioned on the
low pressure side of the cooling circuit.
It stops the compressor in the case of
anomalous working pressures.
High pressure pressure switch
With fixed calibration, positioned on the
high pressure side of the cooling circuit.
It stops the compressor in the case of
anomalous working pressures.
3.5 ELECTRIC COMPONENTS
Electric control board
Contains the power section and the
management of controls and safety
devices.
HOT/COLD switch (Heat pump)
Allows passage from the heating function
to the cooling function; to be performed
with the machine off.
Control keyboard
Allows complete control of the appliance.
Refer to the user manuals for a more
detailed description.
- compressor magnet-circuit breaker
protection
- auxiliary magnet-circuit breaker
protection
- compressor power supply remote
control switches
- pump control
3.6 MICROPROCESSOR
ELECTRONIC ADJUSTMENT
Made up from a management, control
and display board. Functions carried out:
• adjustment of water temperature
entering the evaporator.
• delay compressor start-up.
• summer or winter functioning in
heat pump mode
• counting of compressor functioning
hours.
• counting of pump functioning hours.
• start/stop.
• reset.
• autostart after drop in voltage.
• functioning with possibility of remote
control.
• display of machine status:
compressor ON/OFF;
summer functioning mode;
winter functioning mode.
• alarms management:
– high pressure;
water dif ferential pressure
switch/low pressure flow meter;
anti-freeze;
compressor overload.
• display of the following parameters:
water inlet temperature;
water outlet temperature;
external circuit heat exchanger
output temperature (SS);
• alarms display.
• settings:
set heating;
set cooling;
cold differential;
hot differential
Flow me t er/wat er dif fer ential
pressure switch
Alarm on the ∆T
- Alarms at automatic reset with
limited number of re-starts before
blocking
- ON/OFF from external contact
- Season change from external contact
Refer to the user manual for further
information.
7