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Matrix Installation and Operation Instructions
ATTENTION
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.
11.5 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 from outside 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 manufacturers 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 handle 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 11.1, 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.
