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4.0 Servicing & Maintenance
Zehnder recommends a maintenance contract with a specialist ventilation maintenance company. Some
installers provide a maintenance contract in which the user maintenance can be integrated. Contact the supplier
of the unit for a list of registered installers nearby. The warranty becomes invalid if:
* Parts are used that have not been supplied by the manufacturer.
* The unit is used without filters.
4.1
Warning: The units must be isolated from the Mains Supply before
commencing any service or maintenance work.
4.1.1 Your ComfoAir 155 WMe unit contains forward curved impellers that require cleaning every 5 years, it is
recommended that this is carried out at the same time as the Heat Exchanger cleaning.
Note: The motors have sealed for life bearings, which do not require lubrication.
Periodic cleaning of the ceiling supply and extract valves should be carried out as required, taking care not to
adjust the valves set position, as this may cause an unbalanced system, resulting in either under-ventilation or
unnecessary over-ventilation occurring.
(See Section 4.2.1)
Periodic inspection and/or replacement of filters should be carried out. Frequency greatly depends on
geographic location and urban density. The filters trap dirt in the atmosphere and act as protection for both the
system and the dwelling. The system’s airflow can be reduced if the filters are not replaced, this can affect
overall system performance. For this reason, it is important to check the filters regularly and to replace them as
often as each year
(See Section 4.1.9).
Periodic inspection and/or cleaning of the heat exchanger should be carried out. The filters should help to
protect the heat exchanger but over time, dirt in the atmosphere can penetrate the filters and gain access to the
heat exchanger. The system’s airflow can be reduced if the heat exchanger is not cleaned and this can affect
overall system performance. For this reason, it is important to check the status of the heat exchanger regarding
the time remaining indicated on the display
(See Sections 4.1.10).
The condensation drain is connected to the domestic waste-water system. To prevent sewer smells from
entering your home, the water seal of the domestic waste-water system must always contain water. You can
achieve this by pouring a cup of water into the water seal.
4.1.2
Spare Parts.
Please contact us for replacement filters. A range of spare parts are available, contact us for
details, quoting the serial number and product name of the unit which can be found on the underside of the unit
controller cover as shown in 4.1.4 on page 9.
LCD Control on ComfoAir 155 WMe
• Press control button to activate panel
• Scroll to "User Menu" option and press button to enter
• Scroll to "GRC1 Boost" option and press button
• The current 'Boost' setting status will flash
• Rotate button to desired outcome (30, 60, 90 or 120 minutes)
• Press to confirm
• Screen will time out after 30 seconds
G
C
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O O S T
1
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3 0 M >
B
Part of system Limit Procedure
Valves 6 months Clean the valves
Condensation drain 6 months Fill the condensation drain
Filters 1 year Replace the filters
Heat Exchanger 5 years Clean the Heat Exchanger
Motor Impeller 5 years Clean the Motor Impeller
Factory default 30 mins
Options 30, 60, 90 or 120 mins
