Troubleshooting/Fault Remedy
AEROTOPT LOGON B WP61 Troubleshooting/Fault Remedy
35
Problem Cause
Remedy,
Action
225: Low pressure
problem
Low pressure problem
Affects contact E9 at the LOGON B WP61.
Low pressure switch in the cooling circuit
triggered.
A
Insufficient flow of air through evaporator
A1 Ice
formation
A2 Evaporator
dirty
A3 Duct dirty/plugged
A4 Protective grating dirty
A5 Protective grating iced
A6 Fan not running or not running enough
A7 Pressure loss in ducts too great
B Plugged
filter
C
Injection valve defective, frozen or clogged
D
Incorrect amount of coolant
E
Leak in cooling circuit
A1 Check thawing function (check sensor)
A2 Clean evaporator
A3 Clean duct dirty/remove obstacles from opening
A4 Clean
grating
A5 Check size of mesh (use only one grating)
A6 Check speed, adjust, check voltage
A7 Check length of ducts
If everything in A can be excluded:
B
Measure temperature difference between filter dryer input
and
output
(
∆
T max 3 K)
C
Check, set or replace injection valve
D
Empty and refill in accordance with type plate
E
Oil residue in the unit is another indication of a leak in
the cooling circuit.
The refrigerant technician must be called in such cases.
226: Winding protection
compressor
Affects contact E11 at the LOGON B WP61.
A
Phase interruption (compressor gets hot)
B
Phase reverse (incorrect rotary field)
C Phase
loss
D Phase
asymmetry
E
Short circuit
A
Check all three phases (wait until the winding protection
has cooled, can take several hours).
B Check
electrical
connection.
C
Check whether oil sump heater is working.
D
Make sure the rotation is right.
E
Eliminate short circuit
247: Thawing problem
After the fourth thawing attempt, the evaporator
sensor on the cooling circuit (B84) still has not
reached the evaporator temperature
(Para. 2954) set at the LOGON B WP61.
A
Sensor B91 positioned incorrectly
B
Sensor B84 defective/no longer in the
required
position
C
Not enough energy for thawing
(water temperature in heating circuit too low)
D
Flow rate to the condenser too low
A
Position sensor properly, replace sensor if defective
B
Check sensor position. Check function (measure actual
temperature in all injection pipes and compare with
B84
value)
C
Switch on electric heating element until the minimum
water temperature is reached. Close part of heating circuit.
D
Check pumps for functions, check return and switch valves
358: Soft starter
Softstarter problem
Actions in relation to the LOGON B WP61’s E25
(EX5) contact.
356:
Flow monitor
consumer
Flow monitor consumer
Affects contact N24 at the LOGON B WP61.