Balancing Steps - SystemAir Fantech VHR70R ES Manuel D'installation

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
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.
Illustration #2
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
dramatically during the
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 HIGH
SUPPLY
EXHAUST
Illustration #1
Set screw (on top)
13
∆Pa
32
40
48
55
63