Wilo DrainLift BOX, Installation And Operating Instructions Manual

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34 Installation and operating instructions • Wilo-DrainLift BOX • Ed.06/2022-10
Rexa MINI3-V ... -P
Sewage pump with vortex impeller and vertical threaded connection. Hydraulics housing
made of grey cast iron, impeller made of plastic. Surface-cooled 1~ motor with integrated
operating capacitor and self-switching thermal motor monitoring. Stainless steel motor
housing. Oil-filled sealing chamber with double sealing: a rotary shaft seal is installed on
the motor side, a mechanical seal on the pump side. Detachable connection cable with fit-
ted plug (CEE 7/7).
4.1.5 Level control
DrainLift BOX ... E and DrainLift BOX ... D
The level control takes place via the float switch attached to the pump. The “pump on/off”
switching level is determined by the cable length of the float switch.
DrainLift BOX ... DS
The level control takes place via the separate float switch in the tank and a switchgear. The
switchgear is preset. The “pump on” switching point is determined by the cable length of
the float switch. The “pump off” switching point is defined by the set follow-up time in the
switchgear. The switchgear offers the following functions:
• Collective fault signal (SSM) and collective run signal (SBM)
• Individual fault signal (ESM) and individual run signal (EBM)
• High water alarm
Additional float switch available as an accessory.
• Integrated buzzer, mains-independent
9 V rechargeable battery included in the scope of delivery.
4.2 Operating principle
Single-pump system: Wilo-DrainLift BOX... E
The sewage produced is channelled into the collection reservoir via the inlet pipe, where it
collects. When the water level reaches the switch-on level, the pump is switched on by the
attached float switch and the collected sewage is pumped into the connected discharge
pipe. When the switch-off level is reached, the pump is immediately deactivated.
Double-pump system: Wilo-DrainLift Box... D (main/standby pump)
The sewage produced is channelled into the collection reservoir via the inlet pipe, where it
collects. When the water level reaches the switch-on level, the pump is switched on by the
attached float switch and the collected sewage is pumped into the connected pressure
pipe. When the switch-off level is reached, the pump is immediately deactivated.
If the main pump malfunctions, pumping is performed by the standby pump.
Double-pump system: Wilo-DrainLift BOX ... DS (alternating operation)
The sewage produced is channelled into the collection reservoir via the inlet pipe, where it
collects. When the water level reaches the switch-on level, the pump is switched on by a
float switch and the collected sewage is pumped into the connected discharge pipe. When
the switch-off level is reached, the pump is deactivated after the set follow-up time. Pump
cycling is carried out after every pumping procedure. If one pump malfunctions, the other
pump is automatically activated.
For enhanced operational reliability, a further float switch can be installed in the tank. A
high water level can be defined using this float switch. When the high water level is
reached:
• The switchgear emits audible and visual alarm warning signals.
• Both pumps undergo forced switch-on.
• The collective fault signal is activated.
As soon as the water drops below the high water level, the standby pump is deactivated
once the follow-up time has elapsed, and the warning message is acknowledged automati-
cally. The main pump continues to run in the regular pumping cycle.
4.3 Operating modes
Operating mode S3: Intermittent periodic duty
This operating mode defines a switching cycle in a combination of periods of operation and
standstill. Specified value (e.g. S3 25 %) relates to the operating time. The switching cycle
has a duration of 10 min.
If two values (e.g. S3 25 %/120 s) are specified, the first value relates to the operating time.
The second value specifies the max. period of the switching cycle.
The unit is not designed for continuous duty! The max. volume flow applies to intermit-
tent periodic duty S3!