16
BALANCING STEPS
Use balancing chart located on the
door of the HRV
STEP #1:
Identify the desired airflow using the provided chart. From
the desired airflow (left column) identify the pressure reading
needed by simply following the line. Make sure to set the unit at the
Normal speed before performing the next step.
STEP #2:
Measure the pressure reading by connecting a manometer
on the LOW and HIGH pressure ports located on the duct
connection. Refer to
Illustration #1.
If the pressure reading is
LOWER than the desired value, adjust the balancing dampers by
turning the adjustable arm counter clockwise until the correct
corresponding pressure value is reached. Refer to
Illustration #2
Do
the same for both the SUPPLY and EXHAUST airflows. If the
pressure reading is HIGHER than desired when the damper is fully
opened, please check the distribution system for any anomalies that
could increase the resistance in the distribution system.
• If the house is tightly sealed, adjusting one airflow
may affect the other airflow as well. It is recommended to check each airflow
again to make sure the value did not change dramatically during the balancing
procedure. Make adjustments as necessary.
• The pressure reading from the duct connection refers to the total pressure loss
from the distribution system. A well designed distribution system should have
a total pressure loss between 0.4” (100Pa) and 0.6” (150Pa). The pressure
reading can therefore be used to troubleshoot distribution system. If the
pressure reading is higher than 0.6” (150Pa), we recommend that you inspect
the system and check for closed grilles, blocked exterior hoods or twisted
flexible duct.
STEP #3:
Secure the adjustable arm by tightening the set screw as shown in
Illustration #3
.
HIGH
LOW
LOW
HIGH
SUPPLY
EXHAUST
Adjustment lever (in front)
Set screw (on top)
Illustration #1
Illustration #3
Illustration #2
BALANCING CHART (example only)
Airflow
Normal Speed
Reduced Speed
CFM
L/s
∆In W.G.
Pressure reading
∆Pa
∆In W.G.
Pressure reading
∆Pa
110
52
0.36
91
100
47
0.46
114
90
42
0.55
137
80
38
0.64
161
70
33
0.74
184
0.13
32
65
31
0.78
195
0.16
40
60
28
0.83
207
0.19
48
55
26
0.87
219
0.22
55
50
24
0.92
230
0.25
63
