Lauda E 4 G Operating Instructions Manual page 26

b) Operation as circulation thermostat
−
Always ensure the largest possible cross-section and the shortest possible hose
lengths in the external circuit.
−
If external control is to be used, provide a temperature sensor probe in the external
load (
−
For a hose cross-section that is too small a temperature gradient occurs between the
bath and external load due to a volume flow that is too low. In this case case increase
the bath temperature or the pump level appropriately.
−
With loads situated at a higher level and with the pump stopped and air seeping into the
external fluid circuit, then even with enclosed circuits the external volume may run
empty. This means there is the risk of the thermostat overflowing.
−
Secure the hoses against slippage by using hose clips.
−
If no external load is connected, the outflow nozzle must be sealed off or short-circuited
to the return nozzle.
26
−
Select the division of the pump flow to suit the thermostat-
ing task using the selector switch on the front of the con-
trol head (
−
The position EXT signifies the greatest flow in the external
circuit.
−
With the position INT the external flow is throttled to a
minimum and the outlet for the internal bath circulation is
fully opened.
−
With positions between INT and EXT the flow is divided
up between internal and external circulation.
−
−
−
7.7.1).
Preparations
6.1).
With operation as circulation thermostat it should be
ensured that the shortest hose connections are used
with the largest possible internal hose diameter in or-
der to obtain the largest possible volume flow.
Connect a hose with 11-12 mm inside diameter (
to the pump connections.
Pump connection:
– return to the bath (rear)
– outflow nozzle (front)
( label on control head housing)
ECO GOLD
6.4)
28.04.10/ YACE0088