Matrix Installation and Operation Instructions
The HRV balance must be checked and if necessary rebalanced every time the Heating (HEA) setting is
changed, or if there is change to the system which would significantly change the static pressure at the
return plenum or the exterior ducts to the HRV.
HRV Balancing
The HRV must be balance properly in order to operate at maximum efficiency and avoid problems.
The balancing process ensures the volume of fresh air being brought into the home, is equal to the amount of stale
air being expelled from the home, over all air handler conditions. A variation of 10% is acceptable, with the
greater volume being stale air drawn from the home.
The Matrix uses motor speed to balance airflows. This method of balancing provides quieter operation and
reduced energy consumption over the traditional balancing damper approach.
Flow is measured with the use of a Magnehelic (0-.25 inwg range) and an airflow grid, flow collar or “Flow
Measuring Station”. NTI offers an airflow grid, PN: 83554, that is designed to be installed in a 1” hole located in
a 6” duct. It is important that the flow grid be the same size as the ductwork, and be installed according to the
manufacturer’s instructions. Typically a straight run of 18” on either side of the flow grid is adequate to avoid
false readings. It is helpful if a flow grid is installed in each of the supply and exhaust ducts.
Procedure:
1. Attach the upflow port of the flow grid to the positive pressure port of the Magnehelic and the down flow port
to the negative port.
2. Zero the Magnehelic.
3. Begin by selecting the heating profile required in the Matrix Fan Controller ‘HEA’ menu. Refer to the
heating section of the manual for more explanation. The heating profile selected dictates the air handler
blower speeds and is important to the proper functioning of the HRV. Every time the heating profile is
changed the HRV will require re-balancing.
4. Once the heating profile is selected, advance to the ‘BAL’ menu. By pressing the ‘FUNCTION’ button you
will enter the balancing mode of the HRV. Press the up arrow button and advance through the menus until
you reach the ‘EOH’ menu item. By pressing the ‘FUNCTION’ button you will enter the ‘EOH’ menu. A
number will appear. You will notice the HRV start, if it is not already running, and the main blower of the air
handler will come up to speed. The number on the display represents the speed of the HRV fan in percentage.
In the case of ‘EOH’ the number shown represents the speed of the exhaust ‘E’ fan during a call for high
ventilation ‘O’ (override) while the air handler blower is running at the high ‘H’ heating speed. The
maximum speed setting is 100%, the minimum 30%. Adjust the speed up or down until the desired flow rate
is achieved. Table 15-2, on the following page, has been provided to help in explaining the different settings.
5. Complete the table adjusting each of the setting to the HRV Ventilation Rate provided. These rates are a
guideline only and can be adjusted to meet the specific application.
-Note- When adjusting the exhaust speeds, the supply fan will increase to full speed.
When the balancing is complete, the HRV will maintain balance at any ventilation rate during any air handler
blower condition. This is a unique feature of the Matrix and is essential in providing efficient and adequate
ventilation in this integrated system.
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