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VR 250 ECH/B
Operation and maintenance instructions
206610 (16-11-2010)
9
Systemair
AB
GB
Troubleshooting
Fig. 10
Should problems occur, please check or correct the items below before calling your service
representative.
1. Fan(s) do not start
Check that all fuses and plugs are connected (mains supply and fan plugs).
2. Reduced
airflow
a. Check setting of airflow on control panel.
b. Change filter required?
c. Cleaning of diffusers/louvers required?
d. Cleaning of fans/exchanger block required?
e. Is roof unit/air intake clogged?
f.
Duct system. Check visible duct runs for damage and/or build-up of dust/pollution.
g. Check diffuser/louver openings.
3.
The unit cannot be controlled (control functions are stuck)
Reset control functions by pulling out the plug for 20-30 seconds.
4. Cold
supply
air
a. Check set supply air temperature on the control panel
b. Check if fire thermostat is still alert. If necessary, reset by pressing the red button
“B”
(fig.10)
in the unit.
c. Check if the extract filter needs changing
d. Exchanger block does not rotate (defect rotor belt?)
Possible cause:
-
Defect drive belt for the rotating heat exchanger (ensure that the drive
belt is whole and without any visible damage)
-
Defect rotor motor for operation of the rotating heat exchanger (can be
controlled by pulling the plug of the unit for 10 seconds after which the
units is restarted. The rotor motor should then restart
-
Defect bearings in the heat exchanger rotor (test by rotating the
exchanger wheel by hand. It should rotate freely)
-
The belt pulley on the rotor motor has come loose (check by rotating the
exchanger wheel by hand and see if the pulley rotates on the motor axis).
5. Noise/vibrations
a. Clean fan impellers.
b. Pull the fans out and check that screws holding the fans are tightened.
