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Operation and maintenance instructions
Envistar / CRAMO
DSCR111125.01
Air handling with the focus on LCC
Continuous product development may give rise to specification changes without prior notice.
3.3 Air heater for hot water (code ATEV)
Air heater for hot water (kod ATEV)
The air heater (coil) consists of a number of copper tubes with aluminium fins
pressed on them. The capacity of the coil will be impaired if the coil surfaces
become coated with dust. Not only will this impair heat transfer impaired; it will
also increase the pressure drop on the air side. Even if the ventilation system is
equipped with excellent filters, as time passes, dust can accumulate on the front
edge of the coil fins (inlet side). To make use of its full capacity, the coil must be
kept well vented. Venting is done in the pipework using air release screws in the
pipe connections and/or an air vessel.
Inspection
1. Check the coil fins to detect any deformation caused by impact.
2. Check that the coil does not have any leaks.
Cleaning
If the fins on the coils are fouled: vacuum clean them from the inlet side. As an
alternative, you can carefully blow them clean with compressed air from the
outlet side. If they are more severely fouled: spray them with warm water mixed
with dishwashing detergent (that will not corrode aluminium).
Venting
Vent the air heater and pipework, if required. The air release screws are located
at the top of the coil or on the pipe connections.
Operation
Check that hot water is circulating. You can do so by temporarily increasing the
temperature setting (setpoint).
