JOHNSON CONTROLS
47
SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
FORM 102.20-N1 
ISSUE DATE: 7/06/2016
3
Installing Hood with Moisture Eliminators
1.  Identify the correct hood and its respective loca-
tion by looking at the label as shown in SECTION 
2 - PRODUCT DESCRIPTION in this manual.
2.  Correct orientation is with the tracks or bird 
screenstothebottom.Themountinganges are
pre-drilled.
3.  Each hood is tted with a factory installed bird
screen unless the moisture eliminator option is se-
lected.
4.  ApplytheButyltapetothepre-drilledhoodang-
es and back wall angle that contact the AHU pan-
els.
5.  Use the hex head screws with the EPDM washer 
provided in the fastener pack.
6.  Completely cover each damper opening in the 
AHU panels by its respective hood. The bottom of 
the hood should extend approximately 6 in. below 
the AHU panel opening.
7.  Center each hood over the width of the opening.  
All hoods, especially those containing barometric 
dampers, MUST be installed square.
8.  Seal each hood gutter to the AHU panel with the 
polyurethane caulk (provided).
9.  When multiple hoods are installed in a stacked 
space, the hoods should be approximately 1 1/2 
in. apart so that the bottom hood will extend 6 in. 
below the bottom of the opening.
10.  If equipped, install the optional moisture elimina-
tors as shown in Figure 71 on page 47 using the 
following instructions.
a.  Remove the clip(s) from the leading edge of 
the hood.
b.  Insert the proper size moisture eliminator or 
filter into the tracks.
c.  Reinstall the clip(s) on the leading edge of 
the hood.
Outdoor Air Temperature and/or Humidity 
Sensors
When outside air hoods are shipped loose with AHUs 
that include factory packaged controls, these sensors 
will be dismounted and pulled back into the AHU. The 
contractor should find them secured with tape inside, 
and put them through their respective penetration to the 
exterior, and mount them to the bracket provided.
 
MOISTURE  
ELIMINATOR 
CLIP
BUTYL 
TAPE
CAULK
FIGURE 71 - INSTALLING HOOD WITH OPTIONAL MOISTURE ELIMINATORS
LD13783