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Webasto Charging the A/C system | 6
6244481A_ES_OI_II_Quebec-Montreal_R1234yf 5 / 8
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Fig.4: Refrigerant bleeding
Vehicle interior Bleeding in case of refri-
gerant leakage
Vehicle floor Enclosure in case of off-
floor installation
Vehicle exterior
üAvoid making connections to the refrigerant circuit inside
the passenger compartment of the vehicle. In case the con-
nections are inside the vehicle, the joint must be segreg-
ated from the interior using seals and/or sealant and open
to vent outside the vehicle any eventual refrigerant leak.
üThe venting opening must be kept away from hot surfaces
and / or ignition sources.
üAvoid locating refrigerant connections e.g. hoses to fittings,
fittings to components (valves, filters, pressure switches,
safety valves, etc.) and charge ports in areas close to hot
surfaces (e.g. exhaust pipe, catalyst, engine block, etc…) or
elements likely to generate sparks or electric arcs.
üAvoid the installation of refrigerant solenoid valves inside
the vehicle.
uIn case not already installed: always install over-pressure
safety valves venting in area far from hot surfaces, power
electric lines and any other ignition source.
5.4 Installation
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1
Fig.5: Mechanical installation
The unit comes prepared with 2 M6 rivet-nuts (1) on each side.
uSelect a suitable location for the unit.
uDesign brackets that firmly locate and hold the unit to the
vehicle interior.
The brackets should ensure stiffness and avoid vibrations
and potential cracks.
uMount the brackets on the unit with M6 bolts. Nominal
torque: 5Nm.
üMake sure you can work safely on the vehicle’s refrigera-
tion system.
uConnect the expansion valve to the vehicle’s refrigeration
circuit.
üFor a HVAC unit: Make sure you can work safely on the
vehicle’s cooling system.
uFor a HVAC unit: Connect the heater to the vehicle’s cooling
circuit.
5.5 Electrical connections
Fig.6: Electrical connections
1 + (red) 3 Compressor (yellow/green)
2 Gnd / - (black)
uMake the electrical connections according Fig. 6. See
„chapter9 for power and fuse requirements.
Avoid fitting relays, fuses and switches close to refrigerant
connections.
uInstall the control knobs/switches in a convenient location.
6 Charging the A/C
system
DANGER
Danger of fire
Carry out refrigerant charging operations in ventilated
areas, away from open flames, hot surfaces and any
other ignition sources.
Take into account these measures and all those aimed
at reducing the risk of ignition of the refrigerant in case
of a leakage.
Refer to SAE J 2845.
NOTE
Only use recovery/recycling/recharging equipment for
flammable refrigerants compliant to SAEJ2843.
uPerform a high pressure leak test with nitrogen. Accurately
solve any eventual leak to assure circuit tightness.
uPerform an evacuation test.
If present, activate the solenoid valves during the leak-test, va-
cuum and charge procedure to ensure the correct pressurization
of the entire system.
5


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