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14
SEQUENCE OF OPERATION
Whole House Dehumidifier
The whole house dehumidifier is designed to deliver
dehumidified, filtered air to the living space. Ventilation air can
also be delivered in a controlled fashion using the outside air
venting option.
When the relative humidity exceeds the humidistat set point by
approximately 3%, the humidistat will energize the
dehumidification and air circulation components of the
dehumidifier (with 15-minute delay on digital humidistat). If the
dehumidifier is connected and interlocked with an existing
furnace or air handler, the system’s circulation fan will also be
energized. The dehumidifier 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 dehumidifier will be filtered and
dehumidified. If an outside ventilation air duct has been installed,
fresh air will be filtered and dehumidified and introduced into the
space during this cycle.
Coil Freeze Protection
The dehumidification coil (evaporator) is equipped with a low
temperature freeze thermostat. If the coil temperature is reduced
to the point of ice buildup, the thermostat will turn off the
compressor while allowing the fan to continue running. Once the
coil has returned to normal conditions, the thermostat will allow
the compressor to restart. The prevailing conditions of the return
air, temperature and humidity will determine the length of this
cycle.
Low Pressure Control
If the low-side refrigerant pressure drops to 20 psig, the low
pressure control opens and turns off the compressor. It is an
automatically reset control that will close when the pressure rises
to 50 psig. It may also open if the dehumidifier is installed in a
cool area below 40ºF and then started. Under these conditions,
the dehumidifier will restart within several minutes. Until the
whole house dehumidifier warms up, it may repeat the cycle
several times.
WHOLE HOUSE DEHUMIDIFIER MAINTENANCE
To assure optimum performance from the whole house dehumidifier, the pre-filter should be replaced every three to six months, and the
HEPA air filter every 18 to 30 months.
Pre-filter
The dehumidifier is equipped with a 2" pleated pre-filter.
Operating the dehumidifier with a dirty pre-filter will reduce
dehumidifier capacity and efficiency and may cause the
compressor to cycle off and on unnecessarily. Under normal
operating conditions, the pre-filter should be replaced every
6 months. However, in high particulate concentrations, more
frequent replacements may be necessary. It is recommended
that the pre-filter be inspected regularly for the first 3 to 4 months
to determine the correct replacement intervals.
To replace the pre-filter
1. Locate the filter access panel on the left-hand side of the
dehumidifier. See “Location Requirements.”
2. Remove the ⁵⁄₁₆" hex screws from the panel marked “Filter
Access.”
3. Slide the panel out and down until it is free from underneath
the top panel.
4. Remove the pre-filter by pulling the pre-filter straight out of
the dehumidifier.
Replacement pre-filters may be purchased from your installation
contractor or ordered from the factory if a local representative is
not available. Do not operate the dehumidifier without the pre-
filters, or with less effective pre-filters than originally supplied.
The heat exchange coils inside the dehumidifier could become
clogged and require disassembly to clean.
HEPA or MERV 11 Air Filter
The UH model is equipped with a high efficiency HEPA air filter.
This filter is rated MERV 20, and is more efficient and traps
smaller allergy-causing particles than standard air filters. Under
normal operating conditions, the HEPA air filter should be
replaced every 18 to 30 months. However, in high particulate
concentrations more frequent replacements may be necessary.
The dehumidifier is equipped with a pressure sensing system that
monitors the HEPA air filter and signals when the filters should be
serviced. The LED indicator light on the digital humidistat will
flash “FL” when the filters require service. If the filters are not
serviced promptly, damage to the dehumidifier may occur. The
filters may be changed prior to signal.
The HEPA air filter should be used in conjunction with the 2" pre-
filter. It should be installed in the filter enclosure directly to the
right, or downstream of the 2" pre-filter. The 2" pre-filter serves to
prolong the life of the HEPA air filter.
The XS model is equipped with a 4" MERV 11 filter and should
also be used with the 2" pre-filter.
To replace the air filter
1. Locate the filter access panel on the left-hand side of the
dehumidifier. See “Location Requirements.”
2. Remove the ⁵⁄₁₆" hex screws from the panel marked “Filter
Access.”
3. Slide the panel out and down until it is free from underneath
the top panel.
4. Remove the HEPA air filter by pulling the air filter straight out
of the dehumidifier.