GeneralAire DH70 Dehumidifier - Manual (Page 6)

6
Typical System Operation Sequence
Upon the relative humidity exceeding the humidistat set point, normally by approximately 3%, the humidistat will
energize the dehumidification and air circulation components of the DH70 (note the time delay on some electronic
humidistats). If the DH70 system is connected and interlocked with an existing Heating/Air conditioning system,
this systems circulation fan will also be energized. The DH70 will continue to operate until the humidity level is
reduced to the set point selected on the humidistat and then will cycle off. During this cycle, the air circulated
through the DH70 system will be filtered and dehumidified. If an outside ventilation air duct has been installed, fresh
air will be filtered and dehumidified and introduced to the space during this cycle.
Coil Freeze Protection (Auto Defrost)
Maintenance
High Efficiency Air Filter
The DH70 is supplied with a 2” pleated high efficiency air filter. The 2” filter is rated MERV 11, and is more efficient
than standard air filters and is able to catch much smaller particles that can aggravate allergies. Operating the
unit with a dirty filter will reduce dehumidifier capacity and efficiency and may cause the compressor to cycle off
and on unnecessarily. Under normal operating conditions, the filter will last approximately 6 months. However, in
high particulate concentrations more frequent replacements may be required. It is recommended that the filter be
inspected regularly for the first three to four months to determine the loading and correct replacement intervals.
Your installation contractor should be contacted for assistance.
To access the air filter, remove the filter access panel from the Front or Back side of the unit, marked “Filter Access”.
The filter should be readily visible and can be removed by pulling it straight out of the unit.
Replacement filters can be purchased from your installation contractor or ordered from the factory if a local
representative is not available.
DO NOT operate the unit without the filter, or with a less effective filter than originally
supplied. The heat exchange coils inside the unit could become clogged and require disassembly to clean.
FAILURE TO MAINTAIN SERVICE AND UTILIZE CLEAN FILTERS WILL VOID WARRANTY.
Oiling & Lubrication
The fan motor is factory lubricated and sealed, and no further oiling is required. There are no other components
requiring the addition of lubricants.
Optional Fresh Air Ventilation (OSA)
If your system includes the optional fresh air system, it will have an outside air intake. Check and clean the screen
on the outdoor fresh air intake seasonally. The intake screen must remain clear of any debris that could restrict
airflow into the system. This intake should never be located where undesirable fumes, gases or odors make be
taken up by the intake. In all cases local codes prevail as to the location of fresh air intakes.