Danfoss DTW 300 SP, Инструкция по установке, обслуживанию и эксплуатации

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12.2 Maintenance tasks for both home-owners and service technicians
If the unit needs cleaning, moving etc, the tank should be emptied.
1
2
3
1.
Close the cold water inlet (1).
2. Open the hot water outlet (2).
3. Open the drainpipe (3).
4. After emptying, remount the drainpipe and close it.
•
The handle of the temperature and pressure valve should be pulled out once per half year, to make sure that
there is no jam. Beware of the risk of scalding injuries, because of the high water temperature. The drainage
pipe should be well installed, in order to avoid freezing in cold weather conditions.
•
Clean both the internal air filter and the air filter mounted in the flexible air duct (option) at least every month
for best system performance. If the ambient air contains a great amount of dust or other particles, the air filters
should be cleaned more frequently.
•
If the air filter is mounted directly in the air inlet (that is, an air inlet without a canvas duct), the method of
dismantle the filter is as follows:
1. Anti-clockwise unscrew the air inlet ring.
2. Take out the filter and clean it.
3. Finally, remount the filter back in the unit.
12.3 Special Non-error Conditions
12.3.1 3-min protection
With the power supplied, after shutting down, an immediate restart will be delayed 3 minutes in order to protect
the compressor.
If the self-protection function causes the system to stop, check the following:
•
The power indicator is lit, but the unit will not start. The reason can be that it is forced to run although the
startup requirements have not been met. For example, if the water temperature has already reached the set-
ting temperature, the unit will not start.
•
That the air outlet or inlet is free from obstacles not jammed
•
Strong wind blows towards the air outlet.
12.3.2 Defrosting
•
When it is humid and cold, the unit may need to defrost and thus the water-heating capacity decreases. The
system will stop heating water and instead start defrosting. When the defrosting is finished, the water-heating
starts again.
•
During defrosting, the fan stops working, but the compressor keeps on working.
•
The defrosting time varies from 3 minutes to 10 minutes depending on the ambient temperature and the
amount of frost.
12.3.3 Displayed water temperature
•
When the system stops, a slow decrease of the water temperature is normal due to minor heat loss in idle
mode even if no hot water is used. When the water temperature decreases below the set point, the system will
restart automatically;
•
During water-heating, the displayed water temperature might still initially decrease or will not increase for a
period of time because of the heat exchange of the water. When the whole tank of water has reached the
selected temperature, the system will automatically stop.
34 – Installation, Service and User Manual VMGFK202