17
CLAMP BAND
CLAMP
BAND
RETURN AIR BOX
FLEXIBLE RETURN
DUCT (90° BEND)
SPACE-PAK FAN
COIL UNIT
48" MIN.
FIGURE 2.23: RETURN AIR DUCT INSTALLATION
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ROOM
TERMINATOR
WINTER
SUPPLY
SHUT-OFF
FIGURE 2.24: WINTER SUPPLY SHUT-OFF
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RETURN AIR
BOX
RETURN AIR
FILTER GRILL
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FIGURE 2.22: RETURN AIR BOx INSTALLATION
Winter Supply Shut-Off Installation
Simply insert winter supply shut-offs into the room
terminator openings (see Figure 2.24). Wrap the return
air filter in a plastic bag and reinstall it to block the return
air opening. Winter supply shut-offs prevent moisture
from collecting in ductwork during winter months. Be sure
to remove the plastic bag and all winter supply shut-offs
before operating the system.
Return Air Box & Duct Installation
Remove the return air grill from the return air box and
remove the air filter from the return air grill.
Insert the return box from below for ceiling installation
(or from the front for wall installations) and fasten with
four screws through holes provided on the long side of
the box. (see Figure 2.22).
Then, insert return air grill into box (see Figure 2.22)
and fasten with the four screws provided through the
holes on both sides. Open return air grill (turn the
1
⁄
4
turn
latches) and insert filter. Close the return air grill. Slide
a clamp band (provided with return air box) over one end
of the return air duct. Place that end over the elliptical
flange on the fan coil unit (see Figure 2.23). Move the
clamp over the flange and tighten so the clamp holds the
return air duct securely to the flange.
Follow the same procedures to attach the return air duct
to the return air box (see Figure 2.23).
Step 9: B & C Series Unit Retrofits
For retrofitting an ESP-J series unit to an existing ESP-
B or C series, some modifications will need to be made
to the current system. The necessary changes are
below and the extent of the changes is dependent upon
the model of the unit. (Refer to Figures 2.25 / 2.26 /
2.27)
ESP-2430 Retrofits
The 7" duct can still be utilized with a transition kit (Part
No. BM-6918) available from SpacePak. This kit will
reduce the main plenum from 9" to 7" to adapt to the
existing 7" duct.
ESP-3642/4860 Retrofits
The existing plenum duct, which is typically 7", will need
to be replaced with 8" X 8" duct board or field supplied
9" round duct. The return duct and return grille will also
have to be replaced with the proper parts for the
replacement model. The reason for this change is the
amount of air supplied by current models is 30% higher
than the B & C Series models. The existing 7" duct work
will reduce the air flow and cause excessive static
pressures resulting in lack of performance and could
possibly freeze up the coil which will result in
compressor failure due to short cycling.
NOTICE FOR ALL RETROFITS
It may be necessary to add outlets to the system. The
number of additional outlets will be dependent upon the
external static pressure which should be measured with
a manometer. This measurement should be between
1.2-1.5" WC. For more details on this test procedure and
location for the test, refer to the System Start Up and
Adjustment section in this installation manual.
