9
920-075-09
Ductwork Preparation
Duct ESP:
To determine your system's indoor external static pressure (ESP,
in inches of water) use a duct calculator (as provided by your duct
supplier). Include all ex duct transitions and discharge grille(s).
If ex duct is used, be sure all the slack is pulled out of the ex
duct. Flex duct ESP can increase considerably when not fully
extended. DO NOT EXCEED a total of .30 ESP, as this is the
MAXIMUM design limit for the VERT-I-PAK A-Series unit.
Chassis Installation
Install the following components
A. Ensure that the wall plenum is installed in accordance
with the VPAWP1-8/1-14 Installation Manual.
B. Place the chassis into the closet with the outdoor side
facing the wall plenum opening.
C. Slide the chassis into the wall plenum until the plenum
divider seal is established. (See Figure 9)
The Vert-I-Pak chassis must be inserted into the wall plenum so that the plenum divider gasket makes contact with the plastic condenser
bafe on the unit. The chassis will t approximately 2
3
/
8
" into the wall plenum.
Slide-in View / Chassis Installation
Figure 9
Determining the Indoor CFM: Chart A – CFM
ESP (") Capacity
BTU/h 18000 12000 / 9000
.00 520 420
.10 510 410
.20 500 370
.30 490 330
Correct CFM (if needed):
Chart B – Correction Multipli
ers
Correction Multipliers for:
230V 1.00
208V 0.97
Heating 1.00
Cooling 0.95
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