5/9
© 2006 American Standard All rights reserved 973 002 981 3/05.2006
Perform this step only
for
variant 505
:
Fine control valve 41:
Lower and increase pres-
sure.
8
2...3
0
8
-
0.2
0
Value at M 22 (Test bench:
M 4) adjust via adjusting
screw 891 221 250 4 by
venting device (final adjust-
ment).
Pressure progression
test (upwards)
8
2...3
0
8
-
P2
Fine control valve 41:
Increase the pressure
slowly until a change is
detected at M 22 (test
bench: M 4). Stop the pres-
sure increase at this point
and test M 22.
8
-
0
8
-
Pres-
sure
stage:
max. 0.3
bar in
compari-
son to
the value
in the
line
before.
Fine control valve 41:
Increase pressure slowly.
8
V3
0
8
-
P3
Pressure progression
test (upwards)
Fine control valve 41:
Increase pressure slowly.
8
8
V4
3...2
0
0
8
8
-
-
-
P5
Pressure display at M 22
(test bench: M 4).
Lower the pressure further
until a change is detected
at M 22 (test bench: M 4).
Stop decreasing pressure
at this point and test M 22.
8
-
0
8
-
Pres-
sure
stage:
max. 0.3
bar in
compari-
son to
the value
in the
line
before.
Fine control valve 41:
Carry on decreasing the
pressure slowly.
8
0
0
8
-
0...0,1
Residual pressure
Shut-off cock 42:
Open the pass.
8
0
0
8
-
-
Test step
Manometer (M)
Comment
Default value
Test value
M 11
bar
M 41
bar
M 42
bar
M 43
bar
M 12 /
M 21
bar
M 22
bar
!
M41
Test instruction for
Trailer Control Valves
973 002
(E)
