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Operation and Maintenance
Envistar Flex
DSEF191101.05.EN
Continuous product development may give rise to specification changes without notice.
6.6 Air heater water (code EMT-VV, MIE-CL/ELEV)
Air heater water (code EMT-VV) Air heater water (code MIE-CL/ELEV)
The heating coil consists of a number of copper tubes with aluminium fins
pressed on them. The coil will have impaired capacity if dust forms a coating on
the coil surfaces. Not only does this impair the heat transfer capacity of the coil,
it also increases the pressure drop on the air side.
Even if the ventilation system is fitted with high quality filters, as time passes
dust deposits will form on the front edges of the coil fins (at the inlet side). To
utilise its full capacity, the coil must be well vented. The pipework should be
vented by opening the bleeder screws in pipe connections and/or an air vessel.
Inspection
DANGER!
Risk of serious personal injury and/or damage to air handling
unit.
Read and understand the entire chapter "1.5 General safety
messages" before working on, servicing, or inspecting the air
handling unit.
Check:
1. The coil fins to detect possible mechanical deformity
2. That the water coil is not leaking.
Cleaning
DANGER!
Risk of serious personal injury and/or damage to air handling
unit.
Read and understand the entire chapter "1.5 General safety
messages" before working on, servicing, or inspecting the air
handling unit.
If the fins on the coil are dirty, vacuum clean from the inlet side. Alternatively,
you can blow them clean with compressed air from the outlet side. If they are
severely fouled, you can clean them with warm water mixed with dishwashing
detergent that will not corrode aluminium.