Hydraulic Circuit - AERMEC NRA Serie Manual De Instalación

4. 1 CIRCUITO IDRAULICO
INTERNO (dotazioni di serie)
L'unità viene fornita nelle varie versio-
ni di:
– "Standard NRA 00
- Exchanger plate
- Filter side
- Flu
- water inlet /outlet sensor (SIW-
SUW)
– "NRA D with desupherheater":
Evaporator water hydraulic circuit
- Exchanger plate
- Filter side.
- Flow switch.
- water inlet /outlet sensor (SIW-
SUW).
Water hydraulic circuit
heat recovery unit (desuperhea-
ter)
- Exchanger plate (desuperhea-
ters) 1 / circuit.
- gas 1"½ plumbing connections
NOTA
The parallel plumbing connections
are to be made by the installation
engineer.
– "NRA T with total recovery":
Evaporator water hydraulic cir-
cuit
- Exchanger plate
- Filter side.
- Flow switch.
- water inlet /outlet sensor (SIW-
SUW).
Water hydraulic circuit
total recovery
4.2.2 Example hydraulic circuit
recommended
Safety
valve
Flow switch
8

HYDRAULIC CIRCUIT

4
- (totale recovery) 1 / circuit.
- gas 2"½ plumbing connections
- water inlet /outlet sensor (SIW-
SUW).
– "NRA 01/02/03/04/05/06/07/08"
(Accumulo, pompa alta o bassa
prevalenza con opzione pompa di
riserva)"
- E v a p o r a t o r c i r c u i t ( w i t h
blowdown valve)
- Filter side exchanger
- Flow switch
- water inlet /outlet sensor
(SIW-SUW)
- Expansion vessel
- Storage tank
- Pumps
- Filler assembly with pressure
gauge
- Safety valve
- Bleed valve
NOTE
the presence of the filter is to be con-
sidered compulsory, THE WARRANTY
WILL NO LONGER BE VALID IF IT IS RE-
MOVED. The filter must be kept clean,
so make sure it is clean after the unit
has been installed and then check it
periodically.
Installation of the manual cut-out valves
between the unit and the rest of the sy-
stem must be considered compulsory
for all NRA models ( with or without sto-
rage tank) and for all hydraulic circuits
involving the chiller itself (desuperhea-
ters, total recovery unit), OTHERWISE
THE WARRANTY WILL NOT BE VALID.
The flow switch must be set to the flow
Bleed valve
Expansion
vessel
Pumps
Gruppo
caricamento
Anti-vibrational
Gate valve
joint
Pressure gauge
Water tank
Drainage
cock
rates indicated for the system, OTHE-
RWISE THE WARRANTY WILL NOT BE
VALID.
Tutti gli scambaitori sono provvisti di
ressitenza elettrica.
The parallel water connections are to
be made by the installation engineer.
4.2 HYDRAULIC CIRCUIT
RECOMMENDED
Fig.4.2.2 shows the schematics of
the recommended hydraulic circuit
between the NRA chiller and the user
(shown in the figure by a fancoil).
The following installation is recommen-
ded:
- Manual cut-off valves
- Flexible high-pressure joints
4.2. 1 For versions without
hydronic kit
- Pumps
- Storage tank
- Gruppo di caricamento
- Expansion vessel
- Safety valve
- Bleed valve
NOTE
The hydraulic piping for connection to
the machine must be properly scaled
for the actual water flow rate required
by the plant when functioning.
The installation engineer is responsible
for the hydraulic parallel. The water
flow rate to the heat exchanger must
always be constant.
NOTE
T h e d r a w i n g s a r e
o n l y a p p r o x i m a t e ,
t h e y a r e i n t e n d e d
only to represent the
components to be added
to the standard unit