Instruction manual

4.3 Filter chambers
4.3.1 Installation
Following rules should be respected when installing lter chambers:
Bottom of lter chamber (by preference) is placed at the same height as bath level; this will ensure an easy medium change and prevents
unwanted emptying of tank.
1. Maximum pressure should not exceed indication on dial of manometer.
2. Maximum allowable pressure at temperature range is indicated on top of lter chamber.
3. Adjust diameter of in- and outlet of the lter to required capacity of the system.
4. Return pipe from lter chamber should be placed as far as possible from pump inlet in order to promote good bath movement.
5. Filter chamber 362 has a tiltable lid. Position of lid can be changed by positioning top ring (304).
4.3.2 Operation and Maintenance
Maximum pressure in lter chamber
The maximum pressure in Hendor lter chamber should not exceed the engraved value on top of the cover plate.
Pressure gauge
A pressure gauge is tted on most Hendor lter chambers. An anti-freeze lled chamber above a membrane separates the pressure gauge
from the process liquid. During normal operation the lter chamber regularly should be inspected for ow (dial indication on gauge).
If pressure on manometer is less than usual, the chamber below the manometer should be relled.
Topping up manometer liquid:
After removing gauge (328) and air release screw, top up casing (327) with anti-freeze.
When assembling gauge (mind O-ring 335) liquid must show up.
Put back air release screw into casing and tighten it.
If liquid does not show up repeat procedure here above. If still no liquid shows up the membrane should be replaced.
Remove gauge (328), unscrew 4 screws, take off the lid (327), replace membrane (326), ret 4 screws lightly, holding down the membrane
with unsharp object through lid, tighten 4 screws and repeat above mentioned procedure.
If pressure on the dial of the gauge is not coming back to zero, when the pump is switched off, there may exist a difference of
pressure between inside gauge and open air. To correct dial indication cut off the top of the rubber cap on top of the gauge.
4.3.3 Dismantling and reassembly
Replacement of lter elements
Depending on the type of lter, the lter element(s) should be exchanged reaching a maximum pressure difference of 1-2,5 bar.
Sequence of operation
- switch off pump (ensure pump cannot be started unexpectedly).
- close all main taps.
- open drain valve.
- open air release tap to empty lter chamber.
- loosen all star buttons.
- remove or tilt the lid of the lter chamber; sometimes the gasket sticks to the chamber and extra lifting effort is required to
remove the lid.
Hendor lter chambers are equipped with cartridges, discs or bags.
After removing the contaminated lter medium it should be disposed off according to environmental guidelines.
Properly install the new lter medium to prevent by-pass of unltrated liquid.
Closing sequence
- check sealing rubber of chamber on distortion.
- close lid
- turn two xed star button 4 times clockwise.
- tighten remaining star buttons rmly crosswise.
- close drain valve, open main taps and start-up the pump.
- check unit for any leakage.
- after bleeding the unit, close air release tap.
© Hendor - Quality Pumps & Filters - 8 - Info 28640/R0