16
WS CIRCULATING PUMP DELTA TWP 15
ASSEMBLY
Installation
The circulating pump is installed in the pipeline and as a rule, direct-
ly upstream of the service water reservoir in such a way that the water
from the last tap is pumped back to the reservoir through the circulating
pipeline. A check valve must be installed on the pump‘s discharge side
(primary side) to prevent pump backflow when the tap is opened. A shut-
off valve is installed on the pump‘s inlet side (secondary side) to make
servicing easier. Assemble the pump with the horizontally positioned pump
motor when the power is shut off (the arrow on the pump housing shows
the direction of flow). Ensure when performing the heat insulation work
that the pump motor and the electronic housing are not insulated.
Electrical connection
All of the Delta TWP 15 series pumps are intended for a 230 V AC /
50 Hz connection. The pumps do not require a motor circuit-breaker.
Startup
The system must be thoroughly flushed before the pump is started up to
prevent contaminants or foreign bodies from remaining in the system. The
system must then be thoroughly vented. The pump‘s union nut must be
slightly loosened for this to allow the air to escape from the pump. The
supply line is then carefully opened until water leaks out on the pump.
Please ensure that the electrical connection is protected against water and
moisture. It is recommended that the pump be deactivated for this.
A suitable tool is then used to tighten the union nut and the pump can
be started up. Audible flow noises indicate that air is present in the pipe
system. This process may need to be repeated and in any case, the pump
must be prevented from running dry for prolonged periods.
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