Iveco Stralis AT/AD. Manual

Drain off oil

from the system

Preparing the station

First recovery

Wait 3-5 minutes

Second recovery

Operate on the system

Vacuum for 5-10 minutes

with first vacuum test

Vacuum for 30 minutes

with second vacuum test

Load oil

into the system

Load up to 200 g

refrigerant

Search for leakage with

electronic leak finder

Fully load

the system

Search system for leakage with

electronic leak finder

Pressure check

Are the values

acceptable?

Disconnect the station

from the system

YES

Is there any

leakage?

Is there any

leakage?

Is there any

leakage?

Is there any

leakage?

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Base - January 2003

RECOVERING REFRIGERANT
FROM THE VEHICLE SYSTEM

Before

starting

disconnect

the

pipes

from

the

air-conditioner, check whether it is possible to do the repairs
without discharging the gas.

If this is not possible, the following operations must be carried
out:
- connect the pipe marked HIGH under the pressure gauge

to the evaporator inlet (the inlet is the one on the

pipe with a smaller diameter (H) connecting the drier
filter with the evaporator);

- connect the pipe marked LOW under the pressure gauge

to the evaporator outlet (the outlet is the one on the pipe
with a larger diameter (L) connecting the evaporator with
the drier);

- open the valves V1 and V2;
- open the LOW and HIGH cocks;

Figure 20

77049

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

If the refrigerant reaches the maximum level
(maximum level indicator light L4 on), the recovery
cycle must be stopped immediately by pressing
switch C onto position 0 and transferring the
refrigerant from the filler cylinder to a suitable
external bottle.

- put the switches A, B and C back onto position 0;
- close the V1, V2, LOW and HIGH valves.

- connect the station to the electricity mains (220 V - 50 Hz);

- press the switch A (Process Unit) onto position 1.

The respective indicator light LA1 will come on;

- press the switch B (Refrigerant Process) onto position 1;

- the respective indicator light LB1 will come on;

- press the switch C (Recovery Recycle) onto position 1.

The

recovery

and

recycling

operation

will

start

automatically. The respective indicator light LC1 will come
on to signal the operation in progress.
On completing this operation the unit will automatically
stop and the indicator light LC1 go out. Wait for a few
minutes so that any pockets of refrigerant at low pressure
remaining in the system can increase their pressure, by
absorbing heat, and be able to be recovered. The station
will automatically repeat the recovery cycle if the above
conditions occur;

- Continue the operations following the instructions given

on the following pages.

Figure 21

50636

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Base - January 2003

- connect the pipes to the specific system connections and

open the V1-V2/LOW and HIGH valves;

- press the switch A (Process Unit) onto position 1.

The respective indicator light LA1 will come on;

- press the switch B (Vacuum Process) onto position 2.

The respective indicator light LB2 will come on;

- press the switch D (Vacuum) onto position 1. The system

will automatically start being evacuated and the respective
indicator light LD1 will come on to signal the operation
in progress.

CREATING A VACUUM IN THE SYSTEM

This operation should be carried out if all the repairs have
been performed and the system components have been
properly refitted. This operation is the phase prior to refilling,
therefore proceed as follows:

After a few minutes of operation (10 at most) if the system
has no leaks the indicator light LD2 VACUUM TEST will
also come on. From this time on, evacuation should be
continued for at least two hours to obtain a good
evacuation;

- at the end of the time programmed for evacuation, press

the switch D (vacuum test) onto position 2 and leave the
system in this state for 3-5 minutes.
The indicator light LD2 VACUUM TEST is on if the
system has a good seal. The indicator light LD2 VACUUM
TEST goes out if there is a leak. Eliminate the leak and
repeat the evacuation cycle;

- put the switches D and B back onto position 0 and

proceed with the following phase.

Figure 22

50637

Do not run the vacuum cycle when there is even
minimal pressure in the station or system.

The indicator light LD2 vacuum test fails to come on
if there is a leak. Stop evacuation, eliminate the leak
and repeat the evacuation procedure.

BODYWORK AND CHASSIS FRAME

TRALIS

AT/AD

Content .. 269 270 271 272 ..

Iveco Stralis AT/AD. Manual - part 271