Nu-Air Ventilation Systems Inc. - HRV Operating &Installation Manual
Rev October 10, 2010 - 13 -
3. Ensure again that the balancing dampers are fully open. Record reading from gauge. Repeat the
procedure for the supply duct.
4. Go back to the duct with the higher reading and adjust the balancing damper
until the supply air is equal to the exhaust air reading.
Air meter:
1. Drill a ¼” hole in both the supply and exhaust ducts on the warm-side of the
machine at least 12” away from the HRV and any elbows, tees, etc.
2. Set the HRV on high speed and ensure once again that both balancing
dampers are set in the fully open position with a set-screw.
3. Take a pressure reading in each duct and record the results.
4. Go back to the duct having the higher reading, and damper the airflow down
until the pressure reads to within 10% of the other air flow.
5. Use tape to reseal the holes.
6. To convert pressure readings to airflow (cfm or L/s) refer to the instructions
and table included with the air meter.
For residential applications you should have a minimum ventilation capacity of 10
cfm (5 L/s) per room. The chart that accompanies the flow grid calibrates pressure
readings to airflow.
Refer to ASHRAE Standard 62 for acceptable ventilation rates in commercial buildings.
Calculating TVC (Total ventilation Capacity) for Residential Applications:
• 20 cfm for the master bedroom
• 20 cfm for an unfinished basement
• 10 cfm for each other room in the house
Add these together to arrive at your TVC.
This method is called the “Room Count Method” and is part of CSA F326 (Residential Mechanical
Ventilation Systems). 0.3 air change per hour is no longer used.
Air meter available from Nu-Air wholesalers. (Part #100460)
Balance the HRV in less than five minutes.
4. CONTROLS
Your machine is equipped for remote controls. Options include humidity sensing, off-on control,
intermittent and continuous modes, recirculation as well as high speed control from the dehumidistat or
timer(s). You can also interlock the furnace blower to the HRV. Various means of controlling the
system are described below.
4.1. Main Board Features:
• Powerful transformer – an almost unlimited number of ES Series controls can be connected in
either series or parallel. Up to six (6) WIN-20 Timers can be connected in parallel.
• Self-resetting fuse to protect the board against mis-wiring.
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