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AIR-DESIGN.COM
INSTALLATION & MAINTENANCE INSTRUCTIONS
PREMA
CEILING VOID ENERGY RECOVERY VENTILATION UNITS
31
Condensate Drip Trays and Drains
Drain lines should be checked to ensure that they are unobstructed, free draining and free from debris. They should be
periodically flushed out and chemically treated as necessary to remove any contamination.
Fans
EC fan motors operate from a permanent mains power supply; however their speed is controlled by application of a
variable 0-10VDC input control signal from the control box. The EC fan assembly (comprising of the motorised impeller)
should only be cleaned with a soft dry brush to remove dust deposits. Any excessive build-up of dust or debris may cause
the impeller to become un-balanced. Fan / motor bearings are supplied as ‘sealed for life’.
The fixings holding the fan motor to its mounting bracket should be checked and tightened if necessary. In addition, the fixing
screws holding the motor bracket to the inner casing of the equipment should also be checked and tightened as required.
Damper
At regular intervals check that the blades move freely.
Trouble Shooting (General)
Fault
Possible Cause
Suggested Action
Fan(s) fail to start
Lack of voltage on motor terminals
Insufficient control voltage
Wrong connection
Excessive load
Ensure voltage is consistent with label data
Insufficient performance volume / pressure
Clogged ductwork and / or extract points
Clean ductwork and supply / extract grilles
Clogged impeller
Clean impeller
Dirty filter(s)
Replace filter media.
Note:
Always use original media type to
guarantee unit performance (replace the full
filter set)
Insufficient fan rotation speed
Check mains / control supply voltage
Dirty heat exchanger
Clean heat exchanger block
Reduced airflow after acceptable operation
(see above)
Air leak before and / or after the fan
Check duct connections and / or casing and
restore to original “as installed” condition
Damaged motor / impeller
Check motor / impeller (replace with original
spare parts)
Heat exchanger discharge air temperature too low External air lower than -5° C
Install a PRE / POST heating device
Insufficient Heat Exchanger performance
Build-up of dirt on Heat Exchange fins
Clean Heat Exchanger
Frost formation on Heat Exchanger
External air temperature below -5°C
Fit a PRE-heating device (frost protection
heater)
Airflow hunting
System pressure too high
Modify the ductwork
Check filter(s) pressure (dirty filter) / replace
filter(s)
Clean and / or replace the ducting
