© 2022 All rights reserved. Data subject to change without notice.
77
Rev. C | 2022.02
FCS - Operation Manual
Relay 1 will trip when the 12 month time period from the channel calibration date has expired
and Relay 2 will trip when the 6 month time period from the channel calibration date has
expired. The FCS will show a Fault on the channel status details for the channel for which the
channel calibration date has expired.
12.4.4 Title-24 Occupied Priority Example
NOTE:
This priority setting should only be used for systems that must comply with
California’s Title-24 requirements for enclosed parking garages.
Title 24 Section 120.6 (c) requires that enclosed parking garages have the design and system
to:
1.
Detect contaminant levels and stage fans or modulate fan airflow rates to 50% or
less of design capacity provided acceptable contaminant levels are maintained.
2. Have controls and/or devices that will result in fan motor demand of no more than
30% of design wattage at 50% of design airflow.
3. CO shall be monitored with at least 1 sensor per 5,000 ft2, with sensor located in the
highest expected concentration locations, with at least 2 sensors per zone.
4. CO concentration at all sensors is maintained at 25 ppm or less at all times.
5. The ventilation rate shall be at least 0.15 cfm.ft2 when the garage is scheduled to
be occupied.
6. System shall maintain the garage at negative or neutral pressure relative to other
occupied spaces when the garage is scheduled to be occupied.
7. CO sensors shall be:
•
Certified by the manufacturer to be accurate within ±5% of measurement
• Factory calibrated
•
Certified by the manufacturer to drift no more than 5% per year
•
Certified by the manufacturer to require calibration no more frequently than
once a year
• Monitored by control system that transmits:
• An alarm to facility operator on fault detection
• Resets to design ventilation rates on fault detection
• Checks for and reports a sensor fault if:
•
Sensor not calibrated within the specified calibration period
(once per year)
• During unoccupied periods a sensor deviates from the average
for the zone by more than ±15 ppm for 4 hours.
• During occupied periods a sensor’s 30 minute rolling average
deviates from the 30 minute rolling average of other sensors in
the proximity zone.
For more information relating to Title‐24 please consult the appropriate documents available
on the California Building Standards Commission website http://www.bsc.ca.gov/
SCENARIO:
Building with an underground parking area is occupied from 8am to 5pm on
weekdays and on Saturdays from 8:30am to noon. It is unoccupied the rest of the time.