BAKL6C502AA.doc
KONVEKTA AG
Edition: 12.07.2001
Page: 12/13
7. Trouble check list
- Only skilled personnel is allowed to execute these works!
1)
Malfunction
If the control light for malfunction a/c (H218) is on, the reasons might be the followings:
•
short circuit of the digital outputs
•
no feedback from the compressor or from the circulated air gate
•
short circuit of sensors
•
cable failure of sensors
If there is a malfunction, the control light is on until the fault is eliminated. With a certain computer
program the faults can be called up in plain text and deleted when the fault is eliminated. When
there is a short circuit the short-circuit-proof outputs are checked 5 times and afterwards switched
off and a malfunction is registered. When the malfunction is deleted out off the memory the output
is unblocked. If there is a short circuit or a cable failure in the sensor, a malfunction is registered
with a delay of approx. 30 seconds. If there was only a briefly interruption of the sensor, the fault
message remains but the sensor controls furthermore using the actual sensor value.
Trouble
Cause
Repair
only by refrigeration expert
1)
a/c is not running
thermostat is opened
-
check inside temperature
2)
-
reset thermostat
2)
electric wiring disconnected
-
check wiring at switch plate
relay defective
-
check relay and replace, if necessary
defrosting thermostat cuts off
-
check evaporator blower and replace, if
necessary
too low outside temp.
(possible icing of evaporator)
-
switch on "ventilation" only
2)
dirt on evaporator coil
-
clean evaporator coil with compressed air
compressor does not com-
press
-
check pressure at suction and discharge
side replace compressor, if necessary
too high pressure caused by
high outside temperature
-
let unit run until pressure is stabilized
2)
leak in unit, deficiency or re-
frigerant
-
check unit for leaks
-
recharge refrigerant,
too high pressure
-
check if axial fans are running
-
check automatic fuse
-
clean condenser coil with compressed air
low pressure, drier clogged
-
replace drier
too low pressure, screen of
expansion valve clogged
-
clean screen; renew drier
strong noise at com-
pressor
Defect bearing on compres-
sor.
-
replace ball bearing or complete com-
pressor only
slack V-belt
-
check V-belt at compressor drive
magnetic clutch
-
check connections at magnetic clutch
1)
see handbook „
KONVEKTA
Service Stations“
2)
operator is allowed to execute these works
