Lauda Alpha, Operating Instructions Manual

Page: 26 / 56

26 / 54 Alpha 09/2020 j
6.4 Connection of external circuits
Operation as circulation thermostat
Pump connection is standard for cooling thermostats and available
as accessory for immersion and heating thermostats.
Assembly for immersion/heating thermostats only:
 Pull out the mains plug!
 Fix the external circulation set at the bottom of the control
head by means of the two screws (pan head with cross re-
cess). The external circulation set belongs to the right side of
the head.
 Hang the thermostat into the bath and fix the clamp with the
knurled thumb
screw on the edge of the bath.

When used as circulation thermostat, care for shortest hose
connections with largest inner diameter as possible. This gives
the best flow.

Connect 9 mm internal diameter tubing to the pump con-
nector.

Pump connections
– return to bath
– pump outflow or pump pressure side.
Pump connection link (silicone rubber)


If the cross-section of the tubing is too small

temperature drop between bath and external system
due to low flow rate. Increase the bath temperature appropriately.

Always ensure the maximum possible flow cross-section in the external circuit!

If the external consumer is placed at a higher level than the thermostat, the pump is stopped
and air penetrates into the thermostating circuit, the external liquid may drain down into the
bath even with a closed system

danger of flooding the thermostat!

Protect tubing with hose clips against slipping off!!

When no external consumer is connected to the thermostat, the pump outflow connection
must be linked to the return (pump connection link).