APPENDIX 2 - HEPA FILTER, TEMPERATURE SENSORS, & EXHAUST FAN OPERATION
17
Exhaust Fan
Exhaust fans are configured to operate the fan only once the main blower is “off”. Once activated the exhaust fan pushes open a damper
and exhaust any air from the collector. To ensure that the fan is safely operating, a current sensor determines if the fan motor is properly operating.
Should the fan stop, an audible and visual alarm will be activated.
HEPA Installation
HEPA installations follow NFPA guidelines, thus temperature sensors are installed on the exhaust side of the HEPA filter. These sensors are set at
approximately 450 degrees Fahrenheit which represents the ignition temperature. In addition a photohelic meter is installed to monitor the differential
pressure between the input of the filter and the output of the filter. Photohelic pressure settings are set at the factory and they represent the “when filter is
new” pressure and the suggested replacement pressure for the HEPA.
Fan
Location
Hepa
Temperature
Sensor
Photohelic
Summary of Contents for TYPHOON WX Series
Page 19: ...19 NOTES...