1.3. Fan and ventilation system
1.4. Safety features
Compressor on delay
Hi/low pressure cut outs
High level condensate
All dehumidifiers use double inlet low-pressure centrifugal direct drive fans fitted with forward
curved impellers.
Restriction or adjustment of the air flow rate has a significant effect on the performance of the units.
Therefore, the inlet and exhaust must never be obstructed or attempts made to duct the air to or from
the units.
The filters remove air borne dirt from the air and keep the evaporator clean and this should not be
removed, except for cleaning purposes, as indicated in section 6.1. The filters should not be
replaced by other filters with different pressure drop characteristics.
To ensure that the air is drawn through the evaporator, great care has been taken to seal and
insulate all panels. To ensure proper operation the dehumidifier must never be operated with any of
the panels removed. Great care should also be taken to avoid damage to the seals on the panels.
To protect the compressor from hunting, a start delay has been built into the electrical start-up
circuit. It is important that this delay is adjusted as this may result in compressor damage.
To protect the compressor from operating at temperatures too high or too low, pressure cut-outs
have been included in the refrigeration circuit. These are mounted in the control void behind the side
panel. Both pressure cut outs are automatically reset when the pressure has returned within the
design range.
The low pressure cut-out is set to prevent operation against conditions which would encourage the
freezing of the evaporator. The coil is allowed to thaw passively should any ice would have built up,
before the compressor is restarted.
If the level of the condensate in the pump drain pan becomes excessively high, the warning light on
the front panel lights up, Figure 10. If this occurs refer to section 6.2.
not
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QA/IOM/46 Issue 11 - MD Dehumidifier
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