Bleeding The Water Circuit; Refrigerant Charge - Uniflair Aquaflair 00182 Instruction Manual

If there is air in the water circuit it can be bled using the valves:
- on the chilled water intake connection
- on the optional reservoir tank
During the winter shutdown (cooling-only versions) or for special maintenance, it may be necessary to drain
the water circuit. To enable this there are valves:
- on the chilled water output connection
- on the bottom of the reservoir tank
as well as a plug to drain the water in the pump (see diagram):
The chilled water temperature should be set to the maximum possible; this will cause the microprocessor
control to switch on the pump by itself, thus facilitating the draining of the system.
Units are pre-charged in the factory and do not need re-charging unless there have been problems during
transport or installation or the safety valve has intervened. In the event that it is necessary to adjust the
charge, follow the instructions below. If the circuit has been drained for the replacement of components, a
vacuum must be created in the circuit before re-charging.
.
CREATING A VACUUM
CIRCUIT Connect the vacuum pump to
the valves in the compressor housing
and take the vacuum in the system to
0.3 mbar; remember that the vacuum
must not be created too quickly (at least
120 minutes). When the vacuum level
is reached, maintain it for at least 60
minutes.
REFRIGERANT CHARGE The system
must be charged with liquid refrigerant
fluid via the needle valve between the
thermostatic expansion valve and the
evaporator until there are no bubbles in
the flow sight glass. The charge must
be done under normal conditions and
with an output pressure of 16-18 bar.
Check the quantity of refrigerant on the

BLEEDING THE WATER CIRCUIT

REFRIGERANT CHARGE

Charge
connection
IN THE
Regrigerant charge connections
Pump drain plug
Filter drier
Compressor
Pressostat connections
44
Sight Thermostatic
glass valve
Charge
connection
Evaporator