
EXAMPLE: Measured voltage to unit (heaters) is 230 volts. Measured Current Draw of strip heaters is 11.0 amps.
230 x 11.0 = 2530 2530/1000 = 2.53 Kilowatts 2.53 x 3413 = 8635
Supply Air |
| 95 F | |
Return Air |
| ° | |
| 75 F | ||
Temperature Rise |
| ° | |
20° | |||
20 x 1.08 = 21.6 |
|
|
863521.6 = 400 CFM
Indoor Airflow Data
The
The
For thermostats with
Determining the Indoor CFM: Chart A – CFM
|
|
| Model |
|
| |
| VEA09/VHA09 | VEA12/VHA12 | VEA18/VHA18 | |||
ESP (") | Low | High | Low | High | Low | High |
.00" | 340 | 385 | 420 | 470 | 430 | 480 |
.10" | 300 | 340 | 350 * | 420 ** | 400 | 450 |
.20" | 230 | 280 | 290 | 350 | 340 | 400 |
.30” | 140 | 190 | 250 | 300 | 290 | 330 |
Highlighted values indicate rated performance point.
Rated performance for
*VEA12
Rated Performance for
**VHA12
|
| Model | |
| VEA24/VHA24 | ||
ESP (") | Low |
| High |
.00" | 690 |
| 740 |
.10" | 610 |
| 700 |
.20" | 560 |
| 640 |
.30" | 510 |
| 580 |
.40" | 450 |
| 520 |
Highlighted values indicate rated performance point.
Correct CFM (if needed):
Chart B – Correction Multipliers
Ductwork Preparation
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
Ductwork Preparation
Pull the flex duct tight. Extra flex duct slack can greatly increase static pressure
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.
Explanation of charts
Chart A is the nominal dry coil
Fresh Air Door
The Fresh Air Door is an “intake” system. The fresh air door opened via a slide on the front of the chassis located just above the indoor coil. Move the slide left to open and right to close the fresh air door. The system is capable of up to 60 CFM of fresh air @ ~.3” H20 internal static pressure.
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