CompAir Classic 05 - Page 88

A - Introduction
WARNING !
READ HEALTH AND SAFETY PRECAUTIONS
BEFORE MAKING ANY ADJUSTMENTS.
Adjustment procedures shown must only be carried out by
authorised persons fully trained and competent in the maintenance
of CompAir UK Hydrovane compressors.
If you are not able to carry out the work safely, contact your CompAir
UK Hydrovane distributor.
B - Pressure Switch Adjustment (Fig. 5.1)
•
Close air-outlet valve (A).
•
Start compressor, allow pressure to rise until compressor
cuts-out (stops).
WARNING !
ISOLATE THE COMPRESSOR FROM MAINS
ELECTRICAL SUPPLY. LOCK THE ISOLATOR IN
THE OFF POSITION. FIT A SAFETY NOTICE TO
THE ISOLATOR ADVISING THAT WORK IS BEING
CARRIED OUT ON THE COMPRESSOR.
•
Remove pressure-switch cover.
•
To adjust the cut-out higher (stop) pressure; turn the screw
marked (P1) towards:-
minus (-) to reduce cut-out pressure; compressor stops at a lower
pressure.
plus (+) to increase cut-out pressure; compressor stops at a higher
pressure.
Note: Cut-out, higher (stop) pressure must not be set above
10.4 bar.
•
To adjust the lower cut-in (start) pressure; turn screw marked
(P2) towards:-
minus (-) to reduce differential and restart the compressor at a
higher pressure.
plus (+) to increase differential and restart compressor at a lower
pressure.
•
Re-fit pressure-switch cover.
•
Switch mains electrical supply on.
•
Start compressor and carry-out check settings procedure.
C - Minimum Pressure Valve ➀ (Fig. 5.2)
•
Close outlet valve and start compressor.
•
Open outlet valve fully to atmosphere.
•
Check the lowest pressure gauge reading obtainable. This
should be 5.2 - 5.5 bar.
•
If not correct, disconnect vent-down pipe and remove elbow.
•
Adjust pressure by adjusting the screw. Refit elbow and
reconnect vent-down pipe after completing adjustment.
D - Safety Valve Lift Pressure ➁ (Fig. 5.2)
(Where fitted)
•
Safety valve is preset to lift as follows:
7 bar compressors - 10 bar lift pressure
10 bar compressors - 12 bar lift pressure
•
If the safety valve proves faulty, it must be renewed. It cannot be
repaired or adjusted.
Page 88
CompAir Hydrovane
5 Adjustments and Testing
P2
P1
+
-
D
p
P
-
+
Figure 5.1 - Pressure Switch Adjustment
Figure 5.2 - Minimum Pressure Valve and Safety
Valve Lift Pressure