Airflow Measurements - VNT5070 only (continued)
M33131
HIGH
HIGH
LOW
LOW
MAGNEHELIC
MAGNEHELIC
PRESSURE
PORT
EXHAUST AIR
FRESH AIR
ERV/HRV Ventilation Systems 69-2480EF—19
32
Pre & Post Balancing Steps
1
a. Install the flexible duct inner liner (vapor barrier) over the collar and seal with tape, mastic, etc.
Note-flexible insulation should be pulled back and away from the duct collar to allow access to
pressure ports.
b. Proceed with balancing steps described below.
c. Plug the pressure ports.
d. Pull flexible duct insulation over duct collar and stuff inside the double collar; seal insulation to
duct collar with tape.
a. Measure pressure differential across the EXHAUST air stream high and low ports using a
Magnehelic gauge or other pressure gauge.
b. Measure pressure differential across the FRESH air stream high and low ports using a
Magnehelic gauge or other pressure gauge.
c. Look up corresponding air flows from the pressure-airflow correlation table.
d. Adjust airflows to a balanced condition by adjusting blower motor speeds.
e. Usually the blower with more airflow is adjusted to the lower blower airflow rate.
f. Motor adjustments are described in previous section.
Balancing Steps
2
Содержание VNT5070E1000
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