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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. In the
event where multiple choices are available for the same
airflow, we recommend using the pressure reading from the
lowest speed on the chart. Make sure to set the unit at the
correct 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 pres-
sure 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.
• Because the house is tightly sealed, adjusting one airflow may
• The pressure reading from the duct connection refers to the total
STEP #3: Secure the adjustable arm by tightening the set screw as shown in Illustration #3.
Illustration #2
12
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affect the other airflow as well. It is recommended to check each
airflow again to make sure the value did not dramatically change
during the balancing procedure. Make adjustments as necessary.
pressure loss from the distribution system. A well designed distri-
bution system should have a total pressure loss between 0.4"
(100Pa) and 0.6" (150Pa). The pressure reading can therefore be
used as troubleshooting of the distribution system. If 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.
Adjustment lever (in front)
BALANCING CHART (example only)
Airflow
Normal Speed
∆In W.G.
CFM L/s
Pressure reading
110
52
0.36
100
47
0.46
90
42
0.55
80
38
0.64
70
33
0.74
65
31
0.78
60
28
0.83
55
26
0.87
50
24
0.92
Illustration #3
Reduced Speed
∆In W.G.
∆Pa
Pressure reading
91
114
137
161
184
0.13
195
0.16
207
0.19
219
0.22
230
0.25
HIGH
LOW
LOW
SUPPLY
EXHAUST
Illustration #1
Set screw (on top)
∆Pa
32
40
48
55
63
HIGH
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