Hydraulic Circuit; Internal Hydraulic Circuit (Standard Equipment); Preliminary Operations Hydraulic Circuit; Nra 00 (Version Standard Without Storage Tank) - AERMEC NRA 0800 Manuel D'installation

3. 1 INTERNAL HYDRAULIC
CIRCUIT (standard equipment)
The unit is supplied in the various
versions of:
– " S t a n d a r d N R A 0 0
evaporators, without hydronic kit)"
(fig 3)
- Plates heat exchanger
- Filter side exchanger.
- water inlet /outlet sensor
(SIW- SUW).
– "NRA 01/02/03/04/05/06/07/08"
(accumulation, high or low pressure
pump with reserve pump option)"
(fig 3/A)
- Plates heat exchanger
- Assembled filter
- Flow switch (1 per circuit)
- Water inlet and outlet probes
(SIW- SUW)
- 2 Expansion tanks
- Accumulation
- Pumps (1 or 1+1 reserve, high
or low pressure; switching up to
1000 is managed by the circuit
board while for the other sizes it
is manual)
- Charging unit with pressure
gauge
- Drain valve
3.2. 1 NRA 00 (VERSION STANDARD
WITHOUT STORAGE TANK)

HYDRAULIC CIRCUIT

3
- Discharge valve
– "NRA P1/P2/P3/P4 (only high
or low pressure pump with reserve
pump option)" (fig 3/B)
- Plates heat exchanger
( o n l y - Assembled filter
- Water inlet and outlet probes
(SIW- SUW)
- 2 Expansion tanks
- Pumps (1 or 1+1 reserve, high
or low pressure; switching up to
1000 is managed by the circuit
board while for the other sizes it
is manual)
- Drain valve
- Charging unit with pressure
gauge
NOTES
The presence of the filter should
be considered obligatory, and its
removal will make the guarantee
VOID. IT MUST BE KEPT CLEAN,
SO IT IS NECESSARY TO CHECK
ITS CLEAN STATE AFTER THE
INSTALLATION OF THE UNIT, AND
CHECK IT REGULARLY.
The installation of the manual
interception valves between the
unit and the rest of the system
should be considered obligatory for
all NRA models (with and without
accumulation) and for all the
hydraulic circuits that concern the
chiller itself (desuperheaters, total
recovery): if this is not done, the
guarantee will be considered void.
IT IS OBLIGATORY TO CARRY OUT
THE CALIBRATION OF THE FLOW
SWITCH ON THE CAPACITY VALUES
REQUESTED BY THE SYSTEM: IF
THIS IS NOT DONE, THE GUARANTEE
WILL BE CONSIDERED VOID.
The parallel water connections are to
be made by the installation engineer.
3.2 PRELIMINARY OPERATIONS
HYDRAULIC CIRCUIT
Before connecting the chiller, it is a
good idea to run water through the
pipes to eliminate any foreign bodies
that could jeopardise the good working
of the device.
W h e n m a k i n g t h e h y d r a u l i c
connections, check that the indications
in the chapter "Hydraulic connections"
are respected. It is a good idea to
ensure that the connections can be
easily disconnected by means of pipe
unions with rotating couplings.
KEY
1 Plates exchanger with
integrated heater
Filter side exchanger
2
Fig. 3
9