29 PB
External Static Pressure
Correct CFM (if needed): Correction Multipliers
230V 1.00
208V 0.97
265V
Heating 1.00
Cooling 0.95
Table 402 (Correction Multiplier)
Explanation of Tables
Table 401 is the nominal dry coil VERT-I-PAK CFMs. Table 402 is the correction factors beyond nominal conditions.
1 ½ TON SYSTEM ( 18,000 Btu)
Operating on high speed @ 230 volts with dry coil.
measured external static pressure .10
Air Flow = 450 CFM
In the same SYSTEM used in the previous example but having a WET coil you must use a correction factor of .95 (i.e. 450 x .95=428 CFM) to
allow for the resistance (internal) of the condensate on the coil.
It is important to use the proper procedure to check external Static Pressure and determine actual airow. Since in the case of the VERT-I-
PAK, the condensate will cause a reduction in measured External Static Pressure for the given airow.
It is also important to remember that when dealing with VERT-l-PAK units that the measured External Static Pressure increases as the
resistance is added externally to the cabinet. Example: duct work, lters, grilles.
Indoor Airow Data
The Vert-I-Pak A series units must be installed with a free return air conguration. Table 401 lists the indoor airow at corresponding static
pressures. All units are rated at low speed.
Ductwork Preparation
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.
IMPORTANT: FLEX DUCT CAN COLLAPSE AND CAUSE AIRFLOW RESTRICTIONS. DO NOT USE FLEX DUCT FOR: 90 DEGREE BENDS, OR
UNSUPPORTED RUNS OF 5 FT. OR MORE.
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