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Installation and Operating Instructions
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ATTENTION
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Central ventilation unit – KWL 250 W/W ET
9.3
Heat exchanger maintenance and cleaning
9.3.1 Heat exchanger maintenance
The heat exchanger must be checked for contamination and dirt (visual inspection) and, if necessary, cleaned, see
chapter 9.3.2 „Heat exchanger cleaning", page 30.
9.3.2 Heat exchanger cleaning
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Danger to life due to electric shock
An electric shock can result in death or serious injuries.
> Before opening the unit, the unit must be fully isolated from the power supply.
> The unit may only be opened by an authorised electrician.
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Risk of burns due to hot surfaces!
Hot surfaces can cause serious burns.
> Allow unit to cool down for at least 5 minutes or wait until the fans are turned off.
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Risk of injury due to rotating fans!
Rotating fans can injure limbs and cause serious injuries.
> Before working on the unit, wait until the fans are turned off.
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Risk of injury due to the panel or unit door falling down!
The unit cover or rear panel can fall down when removing and cause serious injuries.
> Wear protective footwear.
> Carefully remove the panel or unit door with both hands.
1. Unhook panel (magnetic) upwards.
2. Loosen and remove the screws in the unit door.
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Risk of injury due to the high weight of the heat exchanger!
The heat exchanger can fall down and cause serious injuries when removed from the unit.
> Carefully remove the heat exchanger from the unit with both hands.
3. Carefully remove the heat exchanger
Damage to the heat exchanger due to the use of aggressive cleaning agents.
Aggressive cleaning agents can damage the heat exchanger.
> Do not use aggressive cleaning agents.
4. Clean the heat exchanger with a vacuum cleaner with a brush nozzle or with water.
5. During installation, place the heat exchanger on the guide rail and push up to the stop. Ensure that the receptacle
seals are not damaged!
6. Replace unit door and tighten by hand using screws. Do not use a cordless screwdriver or the like!
9.4
Condensate drain maintenance
The condensate drain must be checked for functionality and, if necessary, replaced as needed and at least every 6
months.
Carry out functional inspection as follows:
– For users
1. Dismantle siphon casing.
Reverse order of installation, see chapter 4.3 „Install ball siphon", page 12 (steps 7-5).
2. Clean siphon with water.
3. Re-install siphon casing, see chapter 4.3 „Install ball siphon", page 12<GT> (steps 5-7).
– For electricians only
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Danger to life due to electric shock
An electric shock can result in death or serious injuries.
> Before opening the unit, the unit must be fully isolated from the power supply.
> The unit may only be opened by an authorised electrician.
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Risk of burns due to hot surfaces!
Hot surfaces can cause serious burns.
> Allow unit to cool down for at least 5 minutes or wait until the fans are turned off.
from the unit (see Fig. 37).
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Fig. 37
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EN
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