Recommended External Hydraulic Circuit; Example Of Recommended Hydraulic Circuit; Start-Up Of The Hydraulic Cirtuit - AERMEC NRA 0800 Manuel D'installation

3.3 RECOMMENDED EXTERNAL
HYDRAULIC CIRCUIT
In the shows a schematisation of
the recommended hydraulic circuit
between the NRA chiller and the
services.
The following installation
recommended:
- Manual interception valves
- Flexible high-pressure joints
- Pressure gauge
3.3. 1 Versions without hydronic kit
- Pump
- Inertial accumulation tank
- Charging unit
- Expansion tanks
- Safety valve
- Drain valve
NOTA
Le tubazioni idrauliche di collega-
mento alla macchina devono essere
3.3. 1 Example of recommended
hydraulic circuit
Drain valve
Safety
valve
Flow switch
adeguatamente dimensionate per
l'effettiva portata di acqua richiesta
dall'impianto nel funzionamento.
La portata dell'acqua allo scambiatore
deve essere sempre costante.
NOTE
is The hydraulic piping for connection
to the machine must be properly
scaled for the actual water flow rate
required by the plant when working.
The water flow rate to the heat
exchanger must always be constant.
3.4 Start-up of the hydraulic
cirtuit
- Before starting up the machine, check
that all the hydraulic connections
have been correctly made, and that
the indications on the plates have
been observed.
- Check that the hydraulic system is
Expansion
tank
Charging
unit
Pump
full and under pressure, and check
also that there is no air (if there is
air, bleed it).
- Check that any interception valves
on the system are correctly opened.
- Check that the circulation pump(s)
are working, and that the water flow
rate is sufficient to close the flow
switch contact.
- Check the water flow rate, measuring
the difference of pressure between
the evaporator inlets and outlets,
and then calculate the rate with the
"Evaporator pressure drops" diagram
in the Aermec documentation.
- Check the correct working of the flow
switch: by closing the interception
valve at the heat exchanger outlet,
the unit must visualise the block.
Reopen the valve and rearm the
block.
Gate valve
Anti-vibration
joint
Pressure gauge
Storage tank
Discharge
tap
NOTE:
T h e d e s i g n s
only indicative; they
merely represent the
components to be added
to the standard unit.
a r e
Fig. 3
11