Webasto KK2000 E Installation And Service Instructions Manual - page 26
Roof-Mounted Air Conditioner KK2000 E
Page 26 / 30
c) Evacuation
Switch on the vacuum pump and vacuum the system for 30 minutes. The
absolute pressure must be at least 0.005 bar.
During the evacuation with the pump running again close all valves on the test
device and check the manometer display. If the vacuum does not change in one
minute, then it can be assumed that the system is sealed. Open the valves again
after every pressure check.
Increase in pressure means the system is not sealed. In this case, stop the
evacuation and find and seal the leaks. Then evacuate the system again.
Close all valves on the test device. Switch off the vacuum pump. Let the system
stand for one (1) hour and check the vacuum. If the vacuum changes, then there
is a leak in the system which must be sealed before repeating the evacuation.
d)
Checking the high pressure monitor
– Connect the test panels to the system.
– Remove fuse F2 (condenser blower) and attach the cover.
– Keep the engine running at average speed and switch on the air conditioning.
– Check whether the compressor switches off at a pressure of 24 bar.
– Remove cover and replace fuse F2 (condenser blower).
– Check whether the compressor switches on again when the pressure drops to
17 bar.
Refilling coolant in partially filled systems
a) General
instructions
Coolant is normally not consumed. Only leaks that may develop during operation
can cause a loss of coolant.
Insufficient amounts of coolant can result in reduced air conditioner performance.
Extreme loss will lead switch off the low pressure switch.
A glass front is on the accumulator dryer to check the coolant level. When this is
filled correctly and with a higher rpm, the coolant will flow smoothly about 5
minutes after the air condition is started. Individual air bubbles are irrelevant. The
coolant only needs to be filled when foam is noticeable.
The coolant is normally refilled as a gas. When this is completely emptied, the
system must be properly evacuated before filling the coolant. (see 6.8.c)