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 flex duct transitions and discharge grille(s).
If flex duct is used, be sure all the slack is pulled out of the flex
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
baffle on the unit. The chassis will fit 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
