Dacia Solenza (engine E7J). Service manual — part 122

62

AIR CONDITIONING

62- 14

Pressure controller

LOCATION
Pressure controller (1) is located on the high-

pressure pipe, near the dryer reservoir.

FUNCTION
The pressure controller is permanently

informing UCE (electronic control unit) about
the circuit pressure.

Subject to pressure value in the high-

pressure circuit, UCE is commanding:
-

circuit break ( by uncoupling the compressor

clutch) when the pressure in the circuit is
decreasing under 1,96 + /-0,2 bar and clutch
coupling when the pressure is over 2,16 +/-
0,2 bar;
-

circuit break when the pressure in the circuit

is over 31,4 +/- 2 bar and compressor clutch
coupling when the pressure is decreasing under
25,5 +/- 2 bar;
-

engine fan starting on second speed, when

the pressure is over 17,7 +/- 1 bar and engine
fan stopping when the pressure is decreasing
under 13.7 +/- 1 bar.

REPLACEMENT

The pressure controller replacement does

not imply the draining of the refrigerant circuit.

Disconnect the pressure controller

connector.

Replace the pressure controller.
When mounting, lubricate the pressure

controller sealing gasket with oil PAG SP 10.
T ighten the pressure controller to the required
moment of 0,9 +/- 0,1 daNm.
Check for refrigerant fluid leaks.

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AIR CONDITIONING

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Filter reservoir

Filter reservoir (1) is attached by means of a

support collar on the right longitudinal girder.

Its function in the AC unit operation is :

- filtering the refrigerant fluid;
- retaining the humidity from the unit;
- forming of a buffer stock of refrigerant

fluid.

The particles interception is necessary because

it might block the thermostatic expansion vale
operation or produce compressor mobile parts
wear or gripping.

The filter reservoir is not to be repaired.

DISMOUNTING

Disconnect the battery.
Drain the AC unit.
Dismount the piping and protect with

protection caps in order to avoid humidity
penetration.

Dismount the filter reservoir off the support

collar and release it.

REMOUNTING

Perform the dismounting operations in the

reverse order.

Fill the AC unit with refrigerant fluid HFC

134a (0,600 Kg) by means of the charging
station.

Check for refrigerant fluid leaks.
When replacing the filter reservoir, fill in

the circuit with 15 ml of oil PAG SP 10.

REMARK

The tightening required moment of
the pipes nuts at the filter reservoir is of
1,4 –2 daNm.
The required tightening moment of
the attachmen t screw of the filter
reservoir support is of 0,7 daNm.

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AIR CONDITIONING

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Unit piping

TIGHTENING MOMENTS(daNm)

Pipe attachment nut 3/4’’on condenser 1,8-2
Pipe attachment nut 5/8’’on condenser 1-1,4
Pipes attachment screw on compressor 1,2
Pipes attachment nut on evaporator

0,57

The AC unit piping is ensuring the refrigeran

t

fluid circulation between the unit components.
When piping is replaced, check the existence
of the protective caps, the lubrication of the
connections and gaskets with compressor oil.

The unit filling and draining valves are placed

on the compressor piping and they different
diameters, so that they can not be reversed.

COMPRESSOR – EVAPORATOR

LOW PRESSURE PIPE

DISMOUNTING

Disconnect the battery.
Drain the AC circuit by means of the

charging unit.

Dismount:

- attachment nut (9) of the pipes

tightening clamp on evaporator (8) (located in
DSAF);

- attachment screw (6) of the pipes

tightening clamp on compressor (5);

- attachment screw (7) of pipes clamp.

Release the pipe (10) and mount protection

caps at its extremities, at evaporator and
compressor.

REMOUNTING

Perform the dismounting operations in the

reverse order.

Replace the gaskets from pipe’s extremities.
Before mounting, the gaskets are to be

lubricated with oil PAG SP 10.

In case pipe (10) is replaced, add 10 ml of

oil PAG SP 10, and in case of its breaking,
100 ml.

COMPRESSOR – CONDENSER

HIGH PRESSURE PIPE

DISMOUNTING

Disconnect the battery.
Drain the AC circuit by means of the

charging unit.

Dismount:

- front grill;
- attachment screw (6) of the high

pressure pipe (4) on compressor (5);

- pipe attachment nut on condenser (12);
- pipe attachment clamp (11) on

condenser.

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10 9

13

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12

6

5

11

8

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AIR CONDITIONING

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Unit piping

Release the pipe and mount protection caps

at its extremities, at compressor and condenser.

REMOUNTING

Perform the dismounting operations in the

reverse order.

Replace the gaskets and lubricate them with

oil PAG SP 10.

When a pipe is replaced, add 10 ml of oil

PAG SP 10 and in case of its breaking, 100 ml.

ATTENTION !
After mounting the AC unit piping,

check for refrigerant fluid leaks.

FILTER RESERVOIR –

EVAPORATOR HIGH PRESSURE

PIPE (DSAF)

DISMOUNTING

Disconnect the battery.
Drain the AC circuit.
Disconnect the pressure controller connector

(2).

Dismount :

- attachment nut (9) of the pipes

tightening clamp on evaporator (8);

- attachment nut of the high pressure pipe

(1) on filter reservoir;

- attachment screw (7) of pipes clamp.

Release the pipe (1) and mount protection

caps at its extremities, at evaporator and
reservoir filter (13).

REMOUNTING

Perform the dismounting operations in the

reverse order.

Check the condition of the gasket and

lubricate them with oil PAG SP 10.

When replacing a pipe, add 10 ml of oil

PAG SP 10 and in case of its breaking, 100 ml.
The “0” rings from the pipe extremities are to
be replaced with new ones.

FILTER RESERVOIR – CONDENSER

HIGH PRESSURE PIPE

DISMOUNTING

Disconnect the battery.
Drain the AC circuit.
Dismount the attachment nuts of the high-

pressure pipe (3) on filter reservoir and con-
denser.

Release the pipe and mount protection caps

at pipe’s extremities (3), at condenser and at
filter reservoir.

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