Install to Fit Your Application
Ideal when…
• Access to dedicated central return for
TrueDRY is available.
• Requires backdraft damper on the
exhaust port to minimize backdraft when
TrueDRY is not on but A/C is.
• (optional) Duct TrueDRY supply with 20%
open gravity damper to provide dry air to
a specific area
SUPPLY
RETURN
AIR HANDLER
TrueDRY
M33150
SEPARATE
RETURN
BACKDRAFT
DAMPER
(OPTIONAL)
GRAVITY DAMPER
A
Dedicated Return to Main Supply
DR120
DR90
TrueDry DR90/DR120 Dehumidification System 69-2690EFS—04
6
Flex duct is recommended in connecting to the TrueDRY DR90/DR120 collars to reduce vibration noise.
M24745
Electrical requirements:
115 VAC outlet. Ground fault
interrupter (GFI) recommended.
Duct Sizing:
use minimum 10-in. diameter round for
duct lengths up to 25 ft. Minimum 12-in. required for
lengths longer than 25 ft. Duct branches from the main
inlet/exhaust should be minimum 10-in. round for 2-3
branches, and 12-in. round or larger for 4 branches or
more.
For the optional fresh air ventilator port, use 6-in. round,
insulated duct for lengths up to 50 ft.
use 8-in. round duct for more than 50 ft. of if more than
100 CFM is required.
Isolated Areas:
Effective dehumidification may require
ducting to isolated or stagnant air flow areas.
SUPPLY
RETURN
AIR HANDLER
TrueDRY
M27324
BACKDRAFT
DAMPER
B
Main Return to Main Supply
Ideal when…
• Running TrueDRY when not running A/C.
• Requires damper on the exhaust port to
minimize backdraft when TrueDRY DR90/
DR120 is not on but A/C is.
• Access to a dedicated central return is
not possible.
