Honeywell TrueFRESH ERV/HRV Série Guide D'installation page 35

Airfl ow Measurements - VNT5070 only (continued)
Pre & Post Balancing Steps
1
a. Install the fl exible duct inner liner (vapor barrier) over the collar and seal with tape, mastic, etc.
Note-fl exible 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 fl exible duct insulation over duct collar and stuff inside the double collar; seal insulation to
duct collar with tape.
Balancing Steps
2
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 fl ows from the pressure-airfl ow correlation table.
d. Adjust airfl ows to a balanced condition by adjusting blower motor speeds.
e. Usually the blower with more airfl ow is adjusted to the lower blower airfl ow rate.
f. Motor adjustments are described in previous section.
TrueFRESH™ ERV/HRV Ventilation Systems 69-2480EF—13
MAGNEHELIC
EXHAUST AIR
HIGH
HIGH
LOW
LOW
FRESH AIR
MAGNEHELIC
PRESSURE
PORT
M33131
33