11
4.4
To clean the heat exchanger
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• Make sure that small children are not beneath the unit when the heat exchanger is removed!
Caution
• Beware of sharp edges during mounting and maintenance. Use protective gloves.
Fig. 5 Heat exchanger
Even if the required maintenance is carried out, dust will build up in the ex-
changer block. It is therefore of vital importance for the upkeep of a high effi-
ciency that the exchanger block is removed from the unit and cleaned
periodically as illustrated below. Clean the heat exchanger at least every 3
years or when required.
1. Disconnect the rotor power supply and the rotor sensor. The cables are
found beside the rotor at the back.
2. Pull out the rotor towards you. Some force may be needed.
3. Gently vacuum the heat exchanger.
Warning
Ensure the rotor motor is not exposed to moisture
4. Remount the rotor. Don’t forget to reconnect the rotor power and sensor
cables.
4.5
To clean fans
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
Fig. 6 Extract and supply air fans
The motor bearings are life time lubricated and mainte-
nance free.
Even if the required maintenance, such as changing of fil-
ters is carried out, dust and grease may slowly build up in-
side the fans. This will reduce the efficiency.
1. Disconnect the fan power cables. The cables are found
beside the fan at the back.
2. Pull out the fans towards you. Some force may be
needed.
3. Clean the fans with a cloth or a soft brush. Do not use
water. White spirit can be used to remove obstinate
deposits.
Allow the fans to dry properly before remounting.
4. Remount the fans. Don’t forget to reconnect the fan
power cables.
4.6
To replace the rotor drive belt
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or electrical work!
If the alarm
Rotor guard
is raised the rotor drive belt may be damaged or broken, see chapter 3.2.3.
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