Friedrich VERT-I-PAK R410A, Service & Parts Manual

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EXAMPLE: Air fl ow requirements are calculated as follows:
(Having a wet coil creates additional resistance to air fl ow.
This addit ional resistance must be taken into consideration
to obtain accurate air
fl ow information.
External Static Pressure
External Static Pressure can best be de fi ned as the pressure
difference (drop) between the Positive Pressure (discharge)
and the Negative Pressure (intake) sides of the blower.
External Static Pressure is developed by the blower as a
result of resistance to air
fl ow (Friction) in the air distribution
system EXTERNAL to the VERT-I-PAK cabinet.
Resistance applied externally to the VERT-I-PAK (i.e. duct
work,
fi lters, etc.) on either the supply or return side of the
External Static Pressure is affected by two (2) factors.
1. Resistance to Air fl ow as already explained.
2. Blower Speed. Changing to a higher or lower blower
speed will raise or lower the External Static Pressure
accordingly.
These affects must be understood and taken into consideration
when checking External Static Pressure/Air
fl ow to insure that
the system is operating within design conditions.
Operating a system with insuf fi cient or excessive air fl ow
can cause a variety of different operating problems.
Among these are reduced capacity, freezing evaporator
coils, premature compressor and/or heating component
failures. etc.
System air fl ow should always be veri fi ed upon completion
of a new installation, or before a change-out, compressor
replacement, or in the case of heat strip failure to insure
that the failure was not caused by improper air
fl ow.
Checking External Static Pressure
The airflow through the unit can be determined by
measuring the external static pressure of the system, and
consulting the blower performance data for the speci
fi c
VERT-I-PAK.
1. Set up to measure external static pressure at the
supply and return air.
2. Ensure the coil and fi lter are clean, and that all the
registers are open.
3. Determine the external static pressure with the
blower operating.
4. Refer to the Air Flow Data for your VERT-I-PAK
system to fi nd the actual air fl ow for factory-selected
fan speeds.
5. If the actual air fl ow is either too high or too low, the
blower speed will need to be changed to appropriate
setting or the ductwork will need to be reassessed
and corrections made as required.
6. Select a speed, which most closely provides the
required air fl ow for the system.
7. Recheck the external static pressure with the
new speed. External static pressure (and actual
air
fl ow) will have changed to a higher or lower value
depending upon speed selected. Recheck the actual
air
fl ow (at this "new" static pressure) to con fi rm
speed selection.
8. Repeat steps 8 and 9 (if necessary) until proper
air fl ow has been obtained.
system causes an INCREASE in External Static Pres-
sure accompanied by a REDUCTION in air
fl ow.
Determining the Indoor CFM: Chart A – CFM
Model
VEA12/VHA12 VEA18/VHA18 VEA09/VHA09
ESP (")
.00"
.10"
.20"
.30”
Low
340
300
230
140
High
385
340
280
190
Low
420
350 *
290
250
High
470
420 **
350
300
Low
430
400
340
290
High
480
450
400
330
Highlighted values indicate rated performance point.
Rated performance for
* VEA12
Rated Performance for
** VHA12
ESP (") Low High
.00" 690 740
.10" 610 700
.20" 560 640
.30" 510 580
.40" 450 520
Model
VEA24/VHA24
Highlighted values indicate rated performance point.
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