Adjusting The Capacity - Heatrae Sadia ADVANCE Installer Manual

5.3. Adjusting the capacity

ä
Caution!
The capacities (high and low) of the ventilation unit must be set
up during commissioning.
Note
If the capacity needs to be increased, first try opening the air
valves more to see if this helps achieve the required capacity.
Increasing the motor speed results in higher energy
consumption and an increased noise level.
The high and low speed settings are the same for supply and
exhaust air because both fans in the ventilation unit are driven by
the same motor.
On top of the ventilation unit there are two potentiometers for
adjusting the minimum and maximum capacity of the unit, which
means the flow rate at low and high speed. The design calculations
for the system or flow rate measurements will indicate whether
these capacities need to be adjusted.
5.3.1. High speed setting
If necessary, adjust the high speed setting with the
right-hand potentiometer. This potentiometer is set to
3
125 m /h by default. The adjustment range goes from
3
75 to 150 m /h (at 150 Pa).
5.3.2. Low speed setting
If necessary, adjust the low speed setting with the left-
hand potentiometer. This potentiometer is set to
3
50 m /h by default and has a lower limit so that it is not
possible to have insufficient ventilation. The
adjustment range is 25 to 75 m
Note
The adjustment ranges for low and high speed are chosen so
that the maximum capacity at low speed is the same as the
minimum capacity at high speed. When the low and high speed
settings are the same, there is no difference in capacity between
the three modes (low, medium and high).
ä
Caution!
Only adjust the potentiometer for high mode when the
ventilation unit is loaded (connected to a duct system). If you
adjust it when the ventilation unit is unloaded ("free discharge"),
the current consumption may become too high. Current limiting
on the circuit board will then cause irregular and jerky motor
operation.
3
/h.
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