Installation Instructions
Part Numbers 50DJ900421 and 50DJ900431
USAGE
UNIT PART NUMBER
48/50DJ,DK,LJ,NK024
50DJ900421
50DW,DY,LW,NY024
48/50DJ,DK,NK028,030
50DJ900431
50DW,DY,NY028,030
GENERAL
Accessory barometric relief dampers can only be in-
stalled on Models 48/50DJ,DK,LJ,NK vertical units equipped
with economizer.
On horizontal units (50DW,DY,LW,NY), the barometric
relief hoods may be installed on field-supplied return
ductwork.
INSTALLATION
Accessory package contains:
1 channel panel (50LJ units only)
1 channel clip
1 preassembled hood/damper assembly
1 fan deck
1 fastener package (taped to inside of hood)
The fastener package contains:
6 screws,
1
⁄
4
AB x
5
⁄
8
-in. long
2 seal strips, 36-in. long x 1-in. wide x
1
⁄
8
-in. thick,
with pressure-sensitive adhesive on one side
2 seal strips, 33-in. long x 1-in. wide x
1
⁄
8
-in. thick,
with pressure-sensitive adhesive on one side
1 seal strip, 4-ft long x
1
⁄
2
-in. wide x
1
⁄
8
-in. thick, with
pressure-sensitive adhesive on one side
Vertical Units (48/50DJ,DK,LJ,NK) — Turn off unit
power.
Accessory barometric relief dampers are installed in place
of the unit panel that is next to the economizer. See Fig. 1.
NOTE: Save all screws as they will be needed later to re-
assemble the panels.
On 50 series units, remove compressor access door/panel
and latch bracket. On all units, remove and discard left chan-
nel panel. See Fig. 2 for channel panel details. On 50LJ units,
it is necessary to remove drip lip over compressor access
panel in order to reach left channel panel screws and remove
panel.
Remove right channel panel. See Fig. 2 for channel panel
details. Save this channel panel as it will be used later in
another position. Remove and discard unit panel.
Secure fan deck in place using unit panel screws removed
earlier. See Fig. 1. (Do not use the 2 middle screws on the
lower set of holes that hold the fan deck to the unit base rail.
Save for use later.)
Fig. 1 — Accessory Barometric Relief Installation Details
48/50 Series
(Sizes 024-030)
Accessory Barometric Relief Dampers
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
Tab 1a 1b
PC 111 Catalog No. 534-822 Printed in U.S.A. Form 48/50D,L,N-3SI Pg 1 10-90 Replaces: 48/50DJ,DK-1SI
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