VARISTAR LHX 20
Commissioning
Cooling module 60714-050
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18
R2.1, May 10, 2012
5.5.2 Test operation
Connect the mains supply and switch the cooling module on with the ON/OFF
button on the control unit. The fans run briefly at maximum speed before being
adjusted down to nominal speed. Since there is as yet no thermal load installed
in the cabinet, the desired temperature of 20 °C is quickly achieved.
Note:
Where no thermal load is installed, the following situations may occur:
(a) Error messages F16 or F18 are signalled. The water inlet temperature is
too low. Remedy: Briefly switch off the cabinet on which the message
appears and switch on again immediately. Messages F16 and F18 can-
not be resolved in any other way.
(b) The temperature display vacillates in the first hour between 18 °C and
25 °C. No action required; the system will stabilise by itself.
(c) Should error messages F18 or F21 occur please notify the plumber/
engineer, who should check the water inlet.
After the test run the bleeder valve (1) can be briefly opened again to check
whether any air has again collected in the heat exchanger. Now the system is
filled with water and bled of air. The bleeder tube can be tucked back into the
module and the cover plate fitted back over the control valve. The bleeder tube
must be fixed to the air inlet grille using a cable tie.
The user cannot make any other adjustments than the air exhaust tempera-
ture.Modifications to the parameterisation or control behaviour of the alarm
outputs can be carried out only by Schroff service personnel or authorised
Schroff service partners.
