Install Instructions
6
Residential Whole House Indoor Air Quality
FORM NO. 300-8105 REV_A DH75 DH100 INSTALLATION OWNERS MANUAL
JPF REV 5-24-2018
F. Installation in Structure with No Existing Forced-Air HVAC System (WH)
When installing the dehumidier in a structure that does not have a forced-air HVAC system, a single return for the
dehumidier should be installed in central open area of the structure. DO NOT locate the return in a bathroom or a
kitchen. The supply of the dehumidier should be located in the remote areas of the structure (such as bedrooms,
den, etc.). By ducting this way, the air inside the structure will circulate through the dehumidier to be ltered and
dehumidied. 5” diameter duct is recommended for branches to the bedrooms, 6” diameter duct is recommended
for branches to larger areas.
G. Installation in Sealed Crawl Space or Sealed Attic (SP)
When installing the dehumidier in sealed crawl space or sealed attic, a single return for the dehumidier should be
installed in central open area of the structure. If the area is open without partitions return ducting is not necessary.
Supply ducting is recommended to enhance the performance of the system. A minimum length of supply duct,
3’ to 6’, will aid in air distribution. If the area(s) being served are divided by walls or partitions, a supply and return
duct system is recommended. In all cases sound duct design practices must be followed such as those provided in
ACCA manual “D”, or ASHRAE’s “Fundamentals of Air System Design”.
Wiring Unit Schematic
• WH = Whole House Dehumidification
• SP = Spot Dehumidification
• Low voltage adapter is included with
your unit for installation of a remote
dehumidistat.
GENERAL FILTERS
INCORPORATED
RF
GF
GT
D2
D1