Model 8142 - Rater/Inspector Verification; Model 8142 - Sequence Of Operation - Aprilaire 8142 Instrucciones De Instalación Y Funcionamiento

MODEL 8142 – RATER/INSPECTOR VERIFICATION
To verify the ventilation time setting, press the Select button to scroll through the calculated Required Continuous CFM and the Measured CFM for
this installation . If any value does not match the expected value, the Set Up Menu must be entered to change the floor area, number of bedrooms or
measured CFM .
CODE
MIN/
HR
The calculation used for the ventilation time setting is (all calculations compliant with ASHRAE Standard 62 . 2 -2010):
(
Minutes per Hour = 60 *
Measured CFM is entered during set up and Required Continuous CFM is calculated according to the equation below:
Required Continuous CFM =
MODEL 8142 – SEQUENCE OF OPERATION
"CODE" SETTING
The control will turn on ventilation with a heating, cooling or fan call for the set number of minutes during a one-hour cycle period . If the outdoor
temperature is above the high temperature ventilation limit, ventilation will not occur with a cool or fan call, but if it is below the low temperature
ventilation limit it will occur with a heat call . If the HVAC equipment does not turn on enough to meet the ventilation time within the hour, the control
will turn on ventilation without a call, if the outdoor air temperature is within the high and low ventilation temperature limits . The control will also
turn on the HVAC system blower, if wired and set up to do so .
If the outdoor temperature exceeds the limits set at the end of the first hour, then no additional ventilation will occur for another 60 minutes, 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 air temperature fell
below the low limit setting ventilation would only occur during a heating call . If the heating only operated for 10 minutes during the hour, the control
will automatically change the cycle period to four hours and work to provide the additional 90 total minutes of ventilation (25 min/hr * 4 hours = 100
minutes, minus the 10 minutes of ventilation that occurred during heating) during the four-hour cycle period .
If the air temperature is still out of range, the control will automatically switch to an 8-hour cycle period, then a 12-hour cycle period and finally a
24-hour cycle period . During 8, 12 and 24 hour cycle periods, the total ventilation time increases to compensate for ventilation effectiveness as defined
in ASHRAE Standard 62 . 2 -2010 . When the cycle period automatically adjusts to 24-hours, the control will turn on ventilation to meet the requirements
even if the temperature is outside of the set limits .
"COMFORT" SETTING
The control will turn on ventilation with a heating, cooling or fan call by the HVAC equipment, if the outdoor air temperature is within the high and
low ventilation temperature limits and the outdoor RH is within the high and low RH limits, for the set number of minutes during a one-hour cycle
period . If the HVAC equipment does not turn on enough to meet the ventilation time within the hour, the control will turn on ventilation without a
call, if the outdoor air temperature and indoor RH is within the set limits . The control will also turn on the HVAC system blower, if wired and set up to
do so .
MEAS
)
Required Continuous CFM
Measured CFM
(
(Floor Area ft * .01) + (No. of Bedrooms + 1)
2
REQ'D CONT CFM FAN
)
* 7.5
MEAS REQ'D CONT CFM FAN
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