39
AIRFLOW BALANCING USING THE PITOT TUBE (ALL
MODELS)
NOTE: Required method for HRV3-195 and ERV5-130
1.
Drill a 3/16” (5 mm) in hole in the duct, ideally three
feet (914 mm) downstream and 12” (305 mm) upstream
of any elbows or bends in the fresh air and stale air
streams.
Damper
Drill 3/16” (5 mm)
holes in stale and
fresh air ducts.
Figure 45. Drill
2.
Insert the pitot tube with the tip facing towards the air
stream in the stale air from Building air stream. Move the
pitot tube around in the duct (facing toward the airflow)
and take an average reading. Record the reading.
Pitot Tube facing
towards the air stream.
Minimum of 18” (457 mm)
from blower to elbows.
Figure 46. Insert Pitot Tube
3.
Repeat step 2 to measure the fresh air to building duct.
Pitot Tube facing
towards the air stream.
Minimum of 18” (457 mm)
from blower to elbows.
Figure 47. Repeat Step
4.
Review the readings and damper down the duct with
the highest duct velocity pressure. Repeat step 2 and
step 3 until both ducts show identical readings.
5.
Upon completion of balancing, seal the holes (foil tape
recommended).
Damper
Figure 48. Balancing Damper
BALANCING DAMPERS
Balancing Dampers are located in the round collars of the
HRV5-150, and the oval collars of the HRV3-150TPD,
HRV5-200-TPD,HRV6-HEX095-TPD,HRV5-270-TPD-
ECM, ERV5-150-TPD and ERV5-175-TPD.
Installations where the HRV is ducted directly to the return
of a furnace or air handler may require additional dampering
on the fresh air to building duct. This is due to the high re-
turn static pressures found in some forced air installations.
Balancing dampers are required to be installed in the fresh
air and stale air ducting for HRV3-195, and ERV5-130. Re
-
fer to ducting illustrations located in the “Overview of Instal-
lation Methods” on page 22.
Push and turn with slotted screwdriver.
Damper automatically locks when
pressure is released.
INSULATED FLEXIBLE DUCTING
HARD/RIGID DUCTING
When connecting duct to
collar, take note where
screws are located. Screws
should be located no further
than 1/2" (13 mm) from outside edge
of collar so as not to impede
operation of the damper.
Figure 49. Balancing Collars
Summary of Contents for ERV5-130
Page 36: ...36 Figure 43 Wiring Diagram HRV5 270 TPD ECM...
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