probst EASYCLEAN EC-60 Operating Instructions Manual page 131

2.3 hYDRAuLIc cONNEcTION
Follow the connection prescriptions already explained in paragraph 4.1.1 in the first part.
In particular, the sizes of the suction circuit must be suitable not to determine on the suction
pump connector:
•
a pressure value higher than 8 bar /116 psi;
•
a vacuum value higher than 0.15 bar /2,18 psi (AX and pumps at 1000, 1450 and 1750
RPM) or higher than 0.1 bar / 1,45 psi (pumps at 2800 and 3400 RPM).
When sucking, the pump must have always a filter with suitable sizes.
On the models LW, ZW, FW, HW, TW and SW there are suction and delivery connectors both
on the right and left side of the head.
2.4 PRESSURE LIMITING/ADJUSTING VALVE
In the models where it is already built-in (LW-K, ZW-K, AX), it is adjusted by the producer
so that it reaches the maximum allowed pressure for the pump by using the nozzle selection
indicated in the following table.
Remember that the data in the table are only for reference and can change according to the
system where the pump is installed.
2.4.1 Recalibration of the pressure limiting/adjusting valve

cAuTION
•
The working pressure must never overcome the maximum level scheduled for the pump (see
also paragraph "F
To recalibrate the valve, operate as follows (refer to fig. 4):
- remove the plastic knob by pulling it towards you;
- loose the socket head screw (m);
- rotate the stopping ring nut (1) in counter-clockwise direction in order to partially
unscrew it;
- set the wished pressure by operating on the hexagon knob (n) (rotating it in clockwise
direction, the pressure increases, while rotating it in counter-clockwise direction the
pressure decreases);
- rotate the stopping ring nut (1) in clockwise direction in order to fix it;
- tighten the socket head screw (m).
48 55
700 800
7,5 2,0
11,3 3,0
13,2 3,5 075
15,2 4,0 085
17,5 4,5
18,0 5,0
21,0 5,5
22,4 6,0
l/ US
min gpm
38
eatures and technical data
69 90 103 110 117
1000 1300 1500 1600 1700
045 035
07 055 05
06 055
065
075
095
").
131 138 152 160 172
1900 2000 2200 2300 2500
03
045 04 035
045
055 055
055
06
075 075
08
180 207 248 276
2600 3000 3600 4000
04 03
045 04 035
055 045
055 05
07 07
bar
psi