Ductwork Preparation And Cfm; Chassis Installation - Friedrich VEA09 Installation & Operation Manual

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
ESP (")
BTU/h 18000
.00 520
.10 510
.20 500
.30 490
3) Correct CFM (if needed):
Chart B – Correction Multipli
Correction Multipliers for:
230V
208V
Heating
Cooling
Capacity
12000 / 9000
420
410
370
330
ers
1.00
0.97
1.00
0.95
920-075-08 (10-04)

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)
Figure 9
Slide-in View / Chassis Installation
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 / " into the wall plenum.
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