De Dietrich HC136 Folleto De Montaje página 8

When assembling the load pump, make sure that the speed
adjustment button and the cleaning screw are accessible.
Do not put hoses into shapes in which air pockets can be
formed.
Check that connectors are leak tight.
When making the electrical connection of the load pump : Refer
to the connection instructions supplied with the control panel..
Place the connector on
PUMP A: HEAT.
2
( ) and set on #PARAMETERS/
Mounting
HC 136 16/06/05 - 300003115-001-C