21
Aermec cod. 4086995_01 05.2013
NRL FC 2000-3600 60Hz
EN
7.4.
SYSTEM LOAD
−
Before starting the load, check that the
system drain tap is closed.
−
Open all the drain valves of the system
and of the related terminals.
−
Open the shut-off devices of the system.
−
Start the filling by slowly opening the wa-
ter system load cock placed outside the
machine.
−
When water begins to flow from the termi-
nal vent valves, close them and continue
loading up to read on the gauge the
value of 1.5 bar.
The system is loaded at a pressure between 1
and 2 bar.
It is advisable to repeat this operation once
the machine has worked for some hours and
to periodically check the system pressure,
restoring if it drops below 1 bar.
Check the hydraulic seal of the joints.
7.5.
EMPTYING THE SYSTEM
−
Before starting to drain the system, turn
"off" the unit
−
Check that the water system load/restore
tap is closed
−
Open the drain tap outside the machine
and all the vent valves of the system and
the corresponding terminals.
If the system uses glycol, this liquid should not
be drained to the environment because it is a
pollutant. It must be collected and, if possible,
reused.
ATTENTION
In case of version with pumping
unit, without standby pump, it
is recommended to install unidi-
rectional valves to the delivery of
each module.
So water reflow is avoided
in the circuit of the pump/s
from the other circuit.
For NRL 2250 model with pumping
unit, it is recommended the
installation, to the delivery of the
module 1250, of a capacity balan-
ce valve, to balance the capacities
between the two evaporators
(module
1000 and 1250).
It is necessary, that the water flow
rate to the chiller unit complies
with the values reported in the
performance tables.
The systems loaded with anti-
freeze or specific regulations, need
the water backflow system.
Special supply/recovery water,
is carried out with appropriate
treatment systems.