3
Assembly: Install single piece outer piston (B) into bearing cover (9) with piston tops pointing
away from motor (See picture on parts list). Slightly bend outer piston (B) along pre-moulded
crease to aid assembly. Place diaphragm in Bearing cover (9) with the moulded o-ring seals
facing away from the motor. Insert each inner piston through the diaphragm into the outer
piston. Turn each piston unit fully seated. Align cam/bearing kit (10) with outer piston (B).
Secure with cam/piston screws using 2Nm of torque.
Assemble lower housing (8, 9 &10) to motor. Set screw MUST be positioned over shaft
indentation and securely tightened.
Reassemble pump upper housing (4, 5 & 7). Check that rubber ferrules are installed in the
upper housing and the O-ring is properly seated before inserting the valve assembly (7) into the
upper housing assembly (5). Align pump assembly to motor and tighten pump head screws
evenly to 3Nm torque.
PRESSURE SWITCH CONTROL.
This may be used to create an automatic pressure system and must be used in conjunction with
an accumulator tank to avoid rapid on-off cycling of the pump. This type of control may be used
to avoid over-pressurisation of the pump on other applications. A pressure relief by-pass
version is also available as a pump safety feature.
Setting the Large Adjustable Pressure Switch (if fitted).
This procedure should be carried out with care by a competent technician.
Disconnect the
electrical supply, remove the switch cover and check that there are no exposed electrical
connectors before re-connecting the supply.
NOTE: Factory fitted pressure switches are pre-adjusted. Check with your pump supplier, if
necessary, before making adjustments.
1. Loosen the differential nut (D) completely
2. Adjust the range nut (R) to the required
cut-in
pressure, using a suitable pressure gauge in
the discharge pipework close to the pump.
3. Tighten the differential nut (D) to give the required
cut-out
pressure.
Fixed Setting Pressure Switches
These are not adjustable. These switches are
not
IP55 and require protection from liquids and
mechanical damage. The complete unit should be fitted in an enclosure. Note: Enclosure
should allow heat to dissipate and keep the motor pump ambient temperature below 40
o
C.
(D) Adjusting screw -
differential
(R) Adjusting screw -
range
