D – Layout and Components
OMM.D.P.AA.00
D‐
1
June
2018
Layout and Components
The general layout and components location is the same for all dehumidifiers of current type, however some may
vary, based on the dehumidifier’s specific options – refer to submittal documentation. Pic. D.1 below shows
all/most available options, some of which may not be present on your dehumidifier.
Dehumidifier Main Components
Main Blower
(1) is in the main blower compartment behind or next to the
Compressor Compartment
(3) with
Main Electric Panel
(2). Based on airflow requirements, number of main blowers may vary (up to four).
o
Two blowers could be installed either side by side or stacked on a top of each other (Pic. D.1A); four
blowers’ arrangement would have two stacks, shown on Pic. 1.DA, installed side by side.
Min Outdoor Air (OA) Opening
(4) has a motorized damper and filter(s). The
Manual OA Damper
(5) is usually
used to set proper amount of outdoor air intake; in some cases, it could be equipped with modulating
actuator for automatic adjustment of outdoor air intake.
o
Outdoor‐installed dehumidifier would have
louver(s)
(76) installed at the OA opening.
Min Exhaust Fan(s)
(EF)
Assembly
(6) (fan and motorized damper) is located on the dehumidifier’s return air
side; Exhaust Air opening in outdoor‐installed dehumidifier is equipped with
louver(s)
(76) also.
o
Min Exhaust Fan Assembly is hinged and could be opened for better access to the fan electric box.
Dehumidifier, equipped with
Heat Recovery (HR)
option, would have
HR glycol coils
(71), installed at the
Min
Exhaust (EF)
and
Min Outdoor Air
(OA)
openings, and
HR pump
(72), installed in return air compartment.
o
If HR option is present,
Min Exhaust Fan Assembly
would normally be equipped with a filter rack.
If dehumidifier is equipped with
Purge
option, additional
Purge‐exhaust fan(s) (PF)
(73) with motorized
damper would be installed on dehumidifier’s return air side, as well as additional
(“Purge”) Outdoor Air (POA)
(74) opening(s), equipped with motorized dampers, would be located directly upstream of
Main Filter Rack
(9). Motorized
Return Air (RA) damper
(75) would be located between return air side and POA opening(s).
o
Outdoor‐ installed dehumidifier would have
louvers
(76) installed at the
Purge‐exhaust fan
and
Purge
Outdoor Air
openings.
Refrigeration
Evaporator
coils (7) and water/glycol
Reheat
coils (8) are located directly downstream of the
Main Filter Rack
(9).
o
Motorized
Evaporator Bypass Damper
(10) is
located next to the evaporator coils; it by‐passes
portion of air around evaporator, thus adjusting
compressor circuit operation. Some dehumidifiers,
based on airflow requirement, could be equipped
with additional manual by‐pass damper also.
o
Each compressor circuit has its own evaporator
coil(s) set (one or two coils per circuit, depending on
capacity), while all reheat coils, generally, are
manifolded together and serve both compressor
circuits together.
Space heater
location, if the dehumidifier is equipped with
one, depends on the heater type:
o
Hot water coil
or
Electric heater
(11a) is usually
located directly downstream of the
reheat
coil;
o
Gas heater
(11b) is usually located downstream of
the main blower(s).
Pic. D.1A
