Recommended External Hydraulic Circuit; Start-Up Of The Hydraulic Circuit - AERMEC NRC Serie Manual Instalación

3.3 RECOMMENDED EXTERNAL
HYDRAULIC CIRCUIT
For the NRC models without storage
tank, the installation of the following
system accessories is recommended
(see figure 3.5):
- Storage tank.
- The filter is an essential component
for the machine to work well.In the
basic and heat pump versions the fil-
ter is supplied (so the assembly is the
responsibility of the customer), while
for the other versions it is assembled
in the factory;
- Manual interception valves between
the unit and the rest of the system
(compulsory), to facilitate maintenan-
ce operations and avoid discharging
the whole system;
- Drain valve;
- Automatic system power supply with
pressure gauge;
- Safety valve.
- Expansion tank
- Pumping unit
For the NRC models fitted only with a
pump unit, the installation of the fol-
lowing system accessories is recom-
mended (see figure 3.6):
- Storage tank.
- manual interception valves between
the unit and the rest of the system
3.5 NRC EXTERNAL HYDRAULIC CIRCUIT, STANDARD (00)
KEY
1 - Water filter (filter supplied)
2 - Flexible joint;
3 - Manual interception valve;
4 - Pump assembly;
5 - Safety valve;
6 - Expansion tank;
8
(compulsory), to facilitate maintenan-
ce operations and avoid discharging
the whole system;
- Drain valve;
- Automatic system power supply with
pressure gauge;
- Safety valve.
- Expansion tank
For the NRC models fitted with an sto-
rage tank on the other hand, the instal-
lation of manual interception valves is
recommended, between the unit and
the rest of the system (compulsory), to
facilitate maintenance operations and
avoid discharging the whole system;
These considerations should be ex-
tended to the hydraulic circuits of the
desuperheaters (or total recovery) as
well, for the NRC models that offer the-
se solutions.
Note
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.
These considerations should be
extended to the hydraulic circuits of
the desuperheaters (or total recove-
ry) as well, for the NRC models that
offer these solutions.
supplied filter
7 - Drain valve;
8 - Storage tank;
9 - Automatic power supply with pressure gauge;
A - Water inlet;
B - Water outlet;
3.4 START-UP OF THE HYDRAULIC
CIRCUIT
- 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
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.
1
2 3 4
5
A
6
7
B
8
9