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5) Ductwork Preparation
1) 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 fl ex duct transitions and
discharge grille(s). If fl ex duct is used, be sure all the slack
is pulled out of the fl 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.
2) Determining the Indoor CFM: Chart A – CFM
3) Correct CFM (if needed):
Chart B – Correction Multipli
ers
6) Chassis Installation
Install the following components as shown in Figure 5.
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 baffl e on
the unit. The chassis will fi t approximately 2
3
/
8
" into the wall plenum.
Slide-in View / Chassis Installation
Figure 9
ESP (") Capacity
BTU/h 18000 12000 / 9000
.00 520 420
.10 510 410
.20 500 370
.30 490 330
Correction Multipliers for:
230V 1.00
208V 0.97
Heating 1.00
Cooling 0.95