Manifold Charts - MAHLE AIR-NEX 9380 Service Manual

11.4

Manifold charts

The manifold chart, where the identification letters of the The manifold chart, where the identification letters of the
sectioning valves are highlighted, and reported as follows:
•
V = vacuum;
•
A = refrigerant recovery;
•
I = interception (HP side and LP side separation); I = interception (HP side and LP side separation);
•
R = refrigerant recharge
•
L1 = New oil injection PAG
•
L2 = New oil injection POE
•
T1 = tracer UV dye injection 1 PAG
•
T2 = tracer UV dye injection 2 POE
The pressure sensors are highlighted, and reported as The pressure sensors are highlighted, and reported as
follows:
•
TP = tank - pressure sensor
•
LP = Low Pressure - pressure sensor
•
HP = High Pressure - pressure sensor
The valves (V, A, R) which must control the gas flow in both ) which must control the gas flow in both
directions must necessarily be double since the single valve directions must necessarily be double since the single valve
is not able to guarantee bidirectional closure.
Notes regarding operator safety:
Attention: presence of dangerous 230 VAC voltage on the
solenoid valve terminals and near the manifold; disconnect solenoid valve terminals and near the manifold; disconnect
the equipment from the mains before each maintenance the equipment from the mains before each maintenance
intervention.
Attention: presence of refrigerant fluid under pressure, in Attention: presence of refrigerant fluid under pressure, in
case of disassembly of manifold or its components ensure
that the tank is closed, the connection pipe between the that the tank is closed, the connection pipe between the
tank and the manifold is empty, the LP and HP connectors tank and the manifold is empty, the LP and HP connectors
are disconnected from any system and closed, that a pipe are disconnected from any system and closed, that a pipe
emptying operation has been made, and the manifold has emptying operation has been made, and the manifold has
been completely emptied.
Fig. 21: Manifold components
PSLP
NOTE: on the manifold drawing above the position of the NOTE: on the manifold drawing above the position of the
pressure sensors is reported only with a labels and the
arrows.
reported as follows:
230 VAC voltage on the
nts ensure
PSHP
PSTP
and the
A I
V
Fig. 22: Manifold circuit
A
PS
V
LP
V V A A
Fig. 23: Manifold valves
V A
PS LP
V PS HP
A
Fig. 24: Manifold with pressure sensors installed. with pressure sensors installed.
| AIR-NEX 9380/9480 NEX 9380/9480 | 18 en
T1
L2
L1
T2
PS
T1 L1
HP
One-way way
PS
valve valve
I I L2
TP
I L2
PS TP
T1
T2
L1
R
R
R
R
R