13
21.05 - 6068956_00
NXP 0500 - 1650 2-PIPE SYSTEM / 4-PIPE SYSTEM
EN
SYSTEM LOADING
Before starting loading, position the unit master switch
at OFF
1.
Check that system drain cock is closed
2.
Open all system and relative terminals vent valves.
3.
Open all system cut-off devices
4.
Start filling by slowly opening the system water
load cock, outside the appliance.
5.
When water starts to escape from the terminal
vent valves, close them and continue loading until
the envisioned pressure value for the system is
reached.
SYSTEM EMPTYING
1.
Before beginning emptying, place the unit master
switch at OFF.
2.
Check that the system water loading/reintegration
cock is closed.
3.
Open the drain cock outside the appliance and all system
and relative terminals vent valves
SYSTEM DRAINING
ATTENTION
If the system should stop during the winter period, the
water present in the exchanger may freeze, causing
irreparable damage to the exchanger it self.
There are three solutions possible for the prevention of
freezing:
1. Drain the water from the appliance completely.
2. Operation with glycoled water, with a percentage of
glycol selected on the basis of the
minimum external temperature envisioned.
3. Use of resistances.
In this case, the resistances must be live for the entire
period that freezing may
•
Check the hydraulic sealing of the joints.
•
It is recommended to repeat this operation after
the appliance has operated for several hours
and to periodically check the system pressure.
Reintegration must be performed with machine
off (pump Off).
•
If the system contains liquid anti-freeze, this
must not be drained freely, as it is a pollutant.
It should be collected and if possible reused.
ATTENTION
5. SYSTEM LOADING
6. SYSTEM EMPTYING
7. SYSTEM DRAINING
