Friedrich A-SERIES Ductwork Preparation, Chassis Installation, Duct ESP, Capacity, BTU/h, 18000

920-075-08

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 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.

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)

2) 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

3)Correct CFM (if needed): Chart B – Correction Multipliers

Correction Multipliers for:

230V	1.00
208V	0.97
Heating	1.00
Cooling	0.95

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 baffle on the unit. The chassis will fit approximately 23/8" into the wall plenum.

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