Operational Cycles; Receiving Tank (Refrigerant Cylinder); Manifold Charts - MAHLE ACX380 Service Manual

11.2

Operational cycles

For components and circuit layout ref. APPENDIX 2 –
OPERATIONAL CYCLES.
11.3

Receiving tank (refrigerant cylinder)

The tank is the component which determines the category
of the entire equipment according to the PED directive.
The PED "Pressure Equipment Directive" 2014/68/EU
defines and regulates all those parts that are subject to
pressure, with a specific ratio between their pressure and
volume.
Safety against the risk due to pressure of the refrigerant
fluid inside the receiving tank is assigned to the safety valve
installed during manufacturing. In case of replacement, use
of new and original spare parts not contaminated with
other substances is recommended as well as requesting
the relative declaration of conformity proving the effective
test of the components in the beginning.
The assistance centre assumes responsibility for
workmanlike assembly and for checking before new
commissioning according to the prescriptions provided for
by the regulations in force in the country of use; in
particular, the assistance centre will have to guarantee that
the assembly will ensure a perfect tightness and that the
safety components are installed appropriately so as to
ensure operation is not jeopardized.
VESSEL 20l
Category III (Dir. 2014/68/EU)
Fig. 20: Refrigerant internal bottle
SAFETY VALVE GAS AIRTEK - VS14NPT20HNBRPED4
PS 20 bar R 1/4 NPT - Category IV (Dir. 2014/68/EU)
11.4

Manifold charts

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);
•
R = refrigerant recharge
•
L1 = New oil injection PAG
•
L2 = New oil injection POE
•
T1 = tracer UV dye injection
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
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 the equipment
from the mains before each maintenance intervention.
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 tank and the manifold is
empty, the LP and HP connectors are disconnected from any
system and closed, that a pipe emptying operation has been made,
and the manifold has been completely emptied.
Fig. 21: Manifold components
| ACX380/4850 | 18 en