Fresh Oil Filling - Bosch ACS 810 Repair Instructions

en | 18 | ACS 810 | Service phases
8.6

Fresh oil filling

i
You can only fill new fresh oil into a vehicle A/C
system, if there is vacuum inside the A/C system.
So you have to start first the vacuum phase.
i
After evacuating the vehicle A/C system, recovered
oil has to be replaced with new oil. The oil
replenishing occurs by pressure difference.
M2
HIGH
T2
M1
LOW
T1
P2
HP
F2
6
C
Des. Description
1 Fresh oil tank
2 Vacuum pump
3 Expansion valve
4 Evaporator/oil separator
5 Compressor oil separator
6 Compressor
7 Internal refrigerant cylinder
8 Refrigerant cylinder scale
9 Used oil bottle
10 Heat exchanger
11 Refrigerant pump
T1 Low pressure hose
T2 High pressure hose
M1 Low pressure gage
M2 High pressure gage
M3 Internal refrigerant cylinder pressure gage
F1 Coarse filter
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1 689 975 253 2021-01-26
EV10
P1
P
11
3
5
4
10
EV7
9
1. Open valve of service quick coupler T2.
2. Open HP valve.
3. Open solenoid valve EV8.
 The pressure difference makes fresh oil in the
graduated bottle be sucked inside the vehicle A/C
system.
i
As buses often have huge quantities of oil (even
more than 1 kg), for the oil replenishing the
refrigerant pump (11) is also used that allows the
replenishing of the hole quantity needed.
4. After filling fresh oil, close solenoid valve EV8 and
switch off the refrigerant pump (11).
EV3
EV5
EV1
EV8
2
VU1
P
1
F1
V5 V6
V1 V3 V4
7
8
Des. Description
F2 Combi filter
VU1 Oil non-return valve
EV1 Vacuum solenoid valve
EV3 Flow solenoid valve
EV5 Recovery solenoid valve
EV6 Filling solenoid valve
EV7 Oil drain solenoid valve
EV8 Oil injection solenoid valve
EV10 Refrigerant pump by-pass solenoid valve
P1 Pressure sensor
P2 Pressure switch
V1 Tank vapour side hose valve
V2 Tank liquid side hose valve
V3 Tank vapour side valve
V4 Tank liquid side valve
V5 Safety valve
V6 Non condensable drain valve
EV6
M3
V2
Robert Bosch GmbH