Homa Sensoflat C 270 WF Original Instruction Manual - page 32
32
Automatic humidity sensor switch
The pumps are provided with a humidity sensor switch which already switches them on with a water level of 5 mm
and pumps out the water to a level of 2 mm. The sensor switch is connected to the pump via a cable.
The sensor contacts can be bridged by, for example, setting up the sensors in a bowl of water. The electrodes
must be submerged in water for this method to function.
Attention: The pump is now no longer protected against dry running. After successful residual emptying,
the pump must be disconnected from the grid (pull plug) and the bridging of the electrodes must be terminated.
Installation of a non-return flap
The pumps are used as emergency pumps in most applications and are therefore only very rarely brought into
operation. Therefore, the pump is not equipped with a non-return flap by default. The reason for this is the
possible functional impairment of the pump under certain conditions. If a very long time (months or years) has
passed since its last operation, dirt may have accumulated on the non-return flap water column (of which the most
recently extracted surface water may have contained significant amounts) and from there may have been
deposited on the non-return flap where it prevents the valve from opening. This is especially applicable since the
pump must be completely ventilated after a longer standstill time during each initial startup.
The disadvantage of installation without a non-return flap is that the water running back out of the line and the
remaining residual water must be removed (wiped up or removed with a wet vacuum). Thus, in most cases, the
possible failure of the pump in an emergency is preferred. A non-return flap should therefore only be installed in
pumps with applications involving frequent operation (at least 1 x per week).
Setup
The pump must be securely set up on the floor; open the valves if
necessary. The sensor switch must be placed on the floor with the
electrodes on the underside. It is important to ensure that the lower edge of
the sensor switch housing is in direct contact with the floor to ensure proper
function. The run time of the pump is 4 minutes, i.e. after achieving the
minimum residual water extraction height of 2 mm (see above), the pump
will run an additional 4 minutes to evacuate any continuously flowing water,
if necessary, without turning off the pump again. If the water level has not
risen after carrying out all of these steps, the pump will switch off
automatically.
5.3. Start-Up
This chapter contains all important instructions for operating personnel for safe commissioning and operation of
the machinery. The following must be complied with and checked:
Type of installation
Operation mode
Minimal submersion in water / maximum submersion depth
After a longer downtime these points must also be checked and detected defaults must be repaired!
The operation and maintenance manual must always be kept with the machinery, or in a dedicated place
where it is accessible for the entire operating personnel.
The following points must be taken into account to avoid personal and material damage when
troubleshooting machinery failures:
The commissioning of the machinery must only be carried out by qualified and trained personnel in
compliance with the safety regulations.
All personnel that is working on the machinery must have received, read and understood the
operating instructions.
Activate all safety equipment and emergency switch-offs before commissioning.
Electrotechnical and mechanical settings must only be carried out by specialists.
This machinery is only suitable for the use under the indicated operating conditions.
5.4. Preparatory work
The machinery was constructed and fitted according to the latest technology, so that it works for a long time and
reliably under normal operating conditions. This requires however that you comply with all requirements and
informations. Small oil leakages of the floating ring seals on delivery are not problematic, but they must be
removed before lowering/immersion into the medium.