7
039-01GB-03
SERVICE INFORMATION
Air dryer type H3, H4, H6 and M1H
Reactivating flow
Part of the dried air from the tower in operation, goes through
the other tower’s dessicant to dry it (see ill 4b).
Reactivating flow nozzle
The reactivating flow is controlled by a nozzle (item S, ill 4b).
The nozzle can be adjusted or exchanged.
To high dew point
There may be several reasons for high dew point:
Operating conditions
The operating conditions (see page 1).
Saturated dessicant
If the dessicant is lightly saturated, close the air dryer’s the out-
going valve. Run the dryer.for at least 24 hours.
If the dessicant is badly saturated it has to be exchanged or
dried in a well ventilated furnace at +300°C.
Oil in dessicant
If the oil and liquid filter is out of function the dessicant could get
saturated with oil.
The dew point raises and oil is sprayed on to the evaporators.
Oil saturated dessicant has to be exchanged.
Timer
Check the cycle time of the dryer acc. to table 2.
Dryer type
Drying cycle (min)
Manometers on tubes
H3
4
Yes
H4
4
Yes
H6
4
Yes
M1H
4
Yes
Table 2: Cycle time of the different air dryers used.
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