Atlas Copco XAHS 146 Dd S3A APP Instruction Manual page 47

XAHS 146 Dd
XATS 156 Dd
XA(S) 186 Dd
XAVS 166 Dd
XAHS 186 Dd
To adjust the normal working pressure, proceed as
follows:
1. Start and warm up the engine (see section
Starting/Stopping).
2. With the outlet valves (AOV) closed, loosen the
regulating valve's lock nut and adjust the
regulating valve (RV) until a pressure of X bar(e)
is reached (see table).
3. Check the minimum speed of the engine. Adjust
minimum speed stop screw if necessary.
X Y
bar(e) 13.5 12
psi 196 174
bar(e) 11.8 10.3
psi 171 149
bar(e) 8.3 7
psi 120.5 101.5
bar(e) 15.5 14
psi 225 203
bar(e) 13.5 12
psi 196 174
4. Open an outlet valve (AOV) just enough to let the
engine (E) run at maximum speed. The working
pressure must be Y bar(e); adjust if necessary with
regulating valve (RV) (see table).
5. Check the engine maximum speed. Adjust the
maximum speed by means of adjusting eccentric
nut on top of speed regulator (SR).
6. Close the outlet valves (AOV), check that the
pressure is between Z1 and Z2 bar(e) (see table).
Lock the regulating valve (RV) by fixing the lock
nut.
Z1 – Z2
13.2 – 13.6
191.5 – 197.5
11.7 – 12.2
167 – 173
8.1 – 8.5
117.5 – 123.5
15.3 – 15.7
219 – 227
13.3 – 13.7
191.5 – 197.5
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