System Pump Down - SystemAir SYSAQUAC 25 Manuel D'installation

10.1.3.2. OUTDOOR UNIT AT A LOWER LEVEL
The pipe links should have a minimum
slope of 1/250 towards the outdoor
unit.

10.2. SYSTEM PUMP DOWN

The SYSAQUAC units are supplied filled with nitrogen. It is imperative to drain the nitrogen charge, then vacuum
drain the entire system and finally check for the absence of leaks prior to proceeding with filling the system with
refrigerant fluid.
Caution
In no event should the compressors be used to pump dow the system. They are not designed
for this usage and serious damage may result.
A vacuum pump must be used for system pump down. Connect the pump to the service taps.
Start the vacuum pump and let it run until the pressure level in the system is below 10-1 mbar (12h recommended).
If this pressure level cannot be achieved, check the capacity of the pump and the entire system for any possible
leakages.
The charges are indicated (refer to § refrigeration specifications) for information purposes only. The filling operation
must continue until 80% to 90% of the indicated charge (adjusted regarding the length of piping connection lines).
Start the system. Continue to add refrigerant until the refrigerant passing under the liquid inspection glass is "clear".
In this event, the refrigerant is entirely in liquid form. Allow the system to operate for about one hour to reach a
stable operating regime.
If necessary, adjust the refrigerant charge in relation to the information provided by the liquid inspection glass and
the measurement of the subcooler temperature. The subcooler temperature value must be between 7°C and 9°C
with standard operating conditions (Tcond = 49°C ±1°C, Tevap = 8°C ±1°C).
L
30 m maxi.
17
Air Handling Unit
H-
15 m maxi.
SYSAQUAC