SERVICE MANUAL
HC 0020 - HC 0057
HC 2020 - HC 2057
Initial Operation of Humidification System of Chambers HC 0 ...and HC 2...
1.Initial
filling-up and operation
of the humidification system
Prior to operating the humidification system, the water supply tank in the
rear of the machine section must be topped-up with demineralized water.
Then the humidification system can be started. If you remove the test spa-
ce floor plate, you can see the water inlet in the lower rear part of the test
space and the circulation of the dew point
bath.
The float ball in the rear
left part of the bath should be lifted by the water level. If the filling-up fails,
activate the pump according to operating instructions (item 6.6 "pump
faults"). The filling process takes approx. 1 minute. Replace floor of test
chamber.
The level in the water bath is accurately controlled. The initial filling pro-
cess lasts about 30 - 60 sees. The water feeding cycle for "ON" is .5 sec.,
for "OFF" 60 sees. The feeding quantity per cycle is 40 ml. If maximum
bath level is not reached after 10 minutes, a fault signal indicating "lack of
water" will be emitted.
In case of changeover from "humidity" to "temperature" (this applies only
to HC 2...) the water from the dew point bath is drained via solenoid dis-
charge valve 11-Y18. This automatic valve stays open for 3 minutes, then
it closes again to prevent the circulation of air during the thermal testing
process.
To render it frost-resistant and prior to transport, the entire humidification
system should be drained. For this purpose, switch off the humidification
system and open the manual check valve HV-27 next to the pump.
Ausgabe Juni 1993
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