Cleaning Heat Exchangers (Heater / Chiller); Cleaning The Plastic Heat Recovery Exchanger; Draining And Inspection Of The Condensate Collection Tank (Not Included In Delivery); Other Minor Maintenance - Airflow Duplexvent Flexi DV1600 Installation, Use And Maintenance Manual

ATTENTION: Only use original filter cassettes! If different cassettes are used, the manufacturer cannot guarantee their
proper function!

Always record the date of replacement of filter cassettes in a suitable way, e.g. in the operational logbook.

9.4 Cleaning heat exchangers (heater / chiller)


It is necessary to clean the exchanger when it only shows minimum signs of contamination.
●
After opening the door vacuum clean all impurities.
●
If the vacuum cleaning of impurities while the exchanger remains in its place does not suffice, disconnect it from the heating /
cooling medium, remove it and clean it using a high-pressure cleaner.
●
When cleaning the exchanger proceed in such a way so as to prevent impurities or moisture from entering other parts of the
appliance.

9.5 Cleaning the plastic heat recovery exchanger

●
The recommended period for cleaning the exchanger is approximately 30 to 50 thousand running hours depending on the nature
of the operating environment.

It is necessary to clean the exchanger when it only shows minimum signs of contamination.
●
After opening the door and unlocking the fixing elements, slide individual recovery exchanger blocks out of the guide rails in the
following order: DUPLEXVENT FLEXI DV1600 - 1, 2, 3, DUPLEXVENT FLEXI DV2600 - 2, 1, 3, 4. Rinse the individual blocks
with hot water containing detergent at a maximum temperature of 70°C.
●
After letting them dry thoroughly, slide the individual heat recovery exchanger blocks back in in the reverse order and secure
them in place.
●
Check for a tight fit of the exchanger in the guide rails.
●
Do not expose the exchanger to ultraviolet light; store it in darkness if necessary.
ATTENTION: Never clean the exchanger with agents that might contain organic solvents - there is a risk of irreversible
damage to the exchanger!!

9.6 Draining and inspection of the condensate collection tank (not included in delivery)

●
If the condensate is drained into a sufficiently large and accessible tank, make sure it is inspected and drained regularly.
●
Make sure the tank is easily accessible; keep it clean!

9.7 Other minor maintenance

●
When replacing the air filters also check the following:
- Cleanliness of the condensate drain. A blocked drain may cause serious problems.
- Condensate drain flooding.
- Door seal condition.
●
Regularly check the liquid level in the manometers, if necessary adjust the zero value using the bottom knob (marked with - +).
Before adjusting to zero make sure that no pressure enters the manometer by disconnecting both hoses located on the top of
the appliance.
●
Also regularly check the condition of the sludge filter (part of the heating / cooling system) on the inlet of heating / cooling water
into the hot water heater / water chiller.
●
Keep the heating/cooling systems including the heater / chiller and the control set bled of air. Check pressure in the heating /
cooling system.
1 0 . F a i l u r e s a n d t r o u b l e s h o o t i n g
Failure
Appliance will not start
up
- The appliance supplies
Appliance supplies
considerable lower air
insufficient air volume
volumes
Symptoms
- Power supply is not connected
- Power supply or interconnecting electric
cables are interrupted
- Not found
- Clogged air filters
- Mechanical obstruction in fresh air
intake or supply air outlets
- Not found
Possible causes
13
Troubleshooting
- Connect to power supply (switch on primary
circuit breakers)
- Disconnect from power supply and contact
a service technician
- Disconnect from power supply and contact
a service technician
- Switch off the appliance
- Disconnect from power supply
- Replace air filters
- Look for mechanical obstructions of fresh air
inlet ports
- Look for mechanical obstructions of supply air
outlets
- Remove obstructions, if any
- Disconnect from power supply and contact
a service technician