Problems with suction are usually due to leaks on the suction side!
In order for domestic waterworks to suck in and work properly, the suction side must be 100% airtight and vacuum-proof. This is the only way for these devices to achieve the necessary vacuum/suction in suction mode to be able to draw in the water without any problems.
The deeper the water level, the higher the vacuum must be built up on the suction side. Note: Air leaks are often watertight (invisible)! The smallest leaks can become a problem, especially at great suction depths. For example, it may be that shallow suction, e.g. from a bucket or pool, works, although suction from the depths is impossible due to minimal leaks.
Correct suction
- Disconnect the domestic waterworks from the power supply.
- Turn the rotary switch (11) to "OFF".
- Unscrew the cover (10) of the filter chamber by hand.
- Open a sealing cap (9) on the pressure side for venting.
- Open any valves in the pressure line (connection devices, water stop, etc.) and empty any residual water in the pressure hose so that the air can escape during filling and suction.
- Slowly fill in the pumped medium via the filler neck (13) (approx. 2 to 3 l) until water emerges via the open connection on the pressure side (8).
- Close the cover (10) of the filter chamber again by hand as far as it will go.
- Close the cap (9) on the pressure side that was opened for venting.
- Insert the mains plug into a 230 V AC mains socket.
- Turn the rotary switch (11) to "START". The pump starts immediately. After successful priming, the rotary switch automatically switches to "AUTO" and the dry-running protection is activated. After reaching the max. pressure, the pump switches off automatically. If the pressure falls below the min. pressure due to water withdrawal, the pump switches on automatically.
If the domestic water unit still does not prime, you can use the following test to check whether the cause lies with the domestic water unit or the suction line!
Air bubble test
1. disconnect the domestic waterworks from the power supply
2. the suction line remains / is connected
3. turn the rotary switch (11) to the "OFF" position
4. open the sealing cap (9) Slowly fill the domestic waterworks with water until water emerges via the air vent
5. close the transparent filter cover (10) as far as it will go. Close the sealing cap (9).
The outlet of the hose on the outlet side must be open.
6. hold the outlet hose at least approx. 1 m upwards and guide its end downwards into a water-filled bucket or similar and hold the hose under water
7. connect the appliance to the power supply. Turn the rotary switch (11) to the "START" position.
Attention:
The domestic waterworks will start immediately.
Air bubbles should now come out of the end of the hose under water and rise. If air bubbles are still rising after 7 minutes without water being pumped, the domestic water unit is drawing in the wrong air on the suction side (cause/remedy is described below).
However, if no air bubbles rise after approx. 30 seconds and no water is pumped, there is another fault, e.g. the non-return valve at the end of the suction hose may be jammed (please check for free movement) or the turbine/filter is clogged, dirty or damaged.
In this case, continue with the suction test first.
Suction test
- Disconnect the domestic waterworks from the power supply
- Remove everything on the suction side that is not part of the device
- Turn the rotary switch (11) to the "OFF" position
- Open the sealing cap (9)
- Slowly fill the domestic waterworks with water until water emerges via the vent, close the transparent filter cover as far as it will go.
- Close the sealing cap (9). The outlet of the hose on the outlet side must be open.
- Hold the outlet hose at least approx. 1 m in the air (see illustration).
- Press the flat inner hand tightly against the suction nozzle of the appliance (see fig.).
- Reconnect the appliance to the power supply. Turn the rotary switch to "START"
Attention: The domestic water unit starts up immediately.
If the domestic waterworks is in order, it will suck in the hand after 10-20 seconds.
The fault is then not in the domestic waterworks itself, but in the suction installation. If it does not suck in the hand, there is a leak in the appliance screw connections (transparent cover, rotary switch, drain plug) or the turbine/filter is clogged, dirty or damaged.
Possible causes of a leak
Caution
Air leaks at screw connections do not necessarily drip and are therefore not obvious!
- Defective suction hose: Even minor damage, abrasions or similar are sufficient here
- Leaks at the transitions between the suction hose and connection parts
- Leakage at the screw connections / at the connection to the pump
- Non-absorbent connection parts were used
- Do not use any plug-in system parts or quick couplings on the suction side, but only direct screw connections, e.g. Art. 1723 or Art. 1724 or vacuum-proof suction and high-pressure couplings, e.g. Art. 7121
- On the suction side, only use suction hoses for suction (e.g. Art. 1411, Art. 1412, Art. 1721-22)
- Connecting parts not screwed tight at the transitions (possibly incorrect sealant used)
Do not use hemp for screw connections in conjunction with threads on the suction side, as air can be sucked in between the fibers. Only use hemp seals on the pressure side, if at all. If sealants are required, we recommend the use of Teflon tape.
Clean the rubber seals before joining/screwing them together and grease them with silicone grease or technical Vaseline
- Transparent filter cover defective. It must be possible to screw it in tightly. If it screws in very easily, it is defective and must be replaced.
- Transparent filter cover overtightened. An overtightened filter cover can also cause a leak on the suction side. In this case, turn the cover back as far as it will go.
See picture