Install Instructions

DETERMINE VENTILATION TIME SETTING
CALCULATING AIRFLOW REQUIREMENT
1. The MINIMUM ventilation requirement is calculated using ASHRAE
62.2-2010.
ASHRAE Airflow in CFM = [House Area in Sq. Ft. x 0.01] +
[(Number of Bedrooms +1) x 7.5]
Note: Use ‘Number of Bedrooms + 1’ or ‘Number of Occupants’,
whichever is larger.
2. TABLE 2 shows the calculated airflow values to the nearest 5 CFM.
3. Record the required CFM. ________
TABLE 2 – CFM REQUIRED
House Sq. Ft.
Number of Bedrooms
2 3 4 5 6 7
1000 35 40 50 55 65 70
1500 40 45 55 60 70 75
2000 45 50 60 65 75 80
2500 50 55 65 70 80 85
3000 55 60 70 75 85 90
3500 60 65 75 80 90 95
4000 65 70 80 85 95 100
4500 70 75 85 90 100 105
5000 75 80 90 95 105 110
MEASURE VENTILATION AIR (CFM) DELIVERY RATE AND SELECT VENT TIME
1. Set the Minutes per Hour knob to 60 minutes to run the blower continuously during measurement. Measure the outdoor air flow (CFM) through
the duct that is bringing in outdoor air. Allow 45 seconds after the ventilator starts before taking the measurement so that the powered damper
(Model 8140 only) has opened completely.
2. Use the CFM Delivered along with the CFM required to find the Cycle Time per hour setting from TABLE 3. For example if the ventilator is
providing 120 CFM, and the requirement is 70 CFM, set the time to 35 minutes.
TABLE 3 – CYCLE TIME SETTING (MINUTES) FOR AIRFLOW DELIVERED VS. AIRFLOW REQUIRED FOR 1 HOUR CYCLE
CFM Delivered
CFM Required
40 50 60 70 80 90 100 110 120
60 40 50 60
80 30 40 45 55 60
100 25 30 40 45 50 55 60
120 20 25 30 35 40 45 50 55 60
140 20 25 30 30 35 40 45 50 55
160 15 20 25 30 30 35 40 45 45
180 15 20 20 25 30 30 35 40 40
200 15 15 20 25 25 30 30 35 40
220 15 15 20 20 25 25 30 30 35
240 15 15 15 20 20 25 25 30 30
260 15 15 15 20 20 25 25 30 30
START UP AND SEQUENCE OF OPERATION
Set the Ventilation Time knob to the setting that was determined in the previous section. The ventilator will turn on with the HVAC equipment for the
set number of minutes during the one-hour cycle period. If the HVAC equipment does not turn on enough the ventilator will turn on and will turn on
the HVAC system blower, if wired to do so, at the end of the one-hour cycle period to ensure the desired ventilation time is met. The first time it turns
on, it will stay on for five minutes to get an accurate air temperature measurement. If the air temperature is within the range that is set (see Set Up),
the ventilator will turn on for the amount of time selected within the one-hour cycle period.
If the air temperature is outside of the set range, then no additional ventilation will occur for another hour, and the cycle period will automatically
adjust to four hours. When the ventilator starts again, it will sample the air temperature and if in range, will meet the set amount of ventilation during
the four-hour cycle period. For example, if the Vent Time was set to 25 minutes per hour and the first time the ventilator came on it measured an air
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