Fläkt Woods
8643 GB 2012.11
8
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Installation and Maintenance Instructions
EQKA Cooling unit
Troubleshooting
To reset the pressure switch
A pressure switch is mounted on each compressor
To reset the protective motor switch:
The protective motor switches are mounted in the control
equipment cubicle.
Remedial measures
Check that there is voltage on all
phases and that the phase sequ-
ence is correct.
Start the fans or test by fitting a jumper
between wiring terminals 55 and 56.
Wait 2 minutes for the dampers to
open before starting the cooling unit.
High pressure switch has tripped.
Reset button is on the pressure
switch. The load is too great or
there is too little air. Check that
filter and coils are not clogged.
Low pressure switch has tripped.
Ingoing air temperature is too low or
there’s a shortage of refrigerant.
Tripped motor protection or ther-
mistor. Press motor protection
button to reset it or let the com-
pressor motor cool off.
Check after resetting the motor
protection that the compressor
operates without abnormal noise.
High pressure switch with automatic
reset has tripped and compressor 1
is switched off for 5 min.
Check that filter and coils are not
clogged.
Check that the control signal is at
least 30% for start of first com-
pressor.
To start all the compressors, the
signal should be at least 90%
Current compressor will start after
a delay of approx. 5 min. Wait!
Current compressor should now
have started. If not, check that
voltage is coming from the com-
pressor contactor. If there is vol-
tage, the compressor is probably
defective.
Display text:
* 3-phase alarm *
* fan Stop *
* Start wait 2 min *
’Alarm H’ alt.
’Alarm High pres.’
’Alarm L’ alt.
’Alarm low pres.’
Alarm Q alt.
Alarm Q1 / Term
1= Capac. alt.
1= Capac. Control
Signal % <030
1/2/3/4 = start
1/2/3/4 = run
Caution!
Faults should always be cleared without
delay!
All service and maintenance should be
performed by professionals!
Service/maintenance of the cooling sys-
tem must only be performed by accre-
dited company with authorized per-
sonnel wearing protective equipment!
Press here
