Chapter D - Layout And Components; Dehumidifier Main Components D - Seresco NP Series Operation And Maintenance Manual

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).
OMM.D.S.AA.01
D – Layout and Components
1
D‐
Pic. D.1A
February
2020