Dwyer 670 - Manual (Page 12)

11
1.4 Events / actions
Safe airflow
• Airflow above alarm level (eg > 80 fpm).
• Green LED on.
Low airflow
• Airflow below alarm level for longer than the low air delay time (5 secs).
• Red LED on (Not flashing).
• Audible alarm sounds (Beep’ on/off every 1 sec) - can be muted via Enter pushbutton.
• Low air relay R1 operates.
Reset: - when airflow rises above Low air level for longer than the low air to safe air delay time (2
secs) the Low air alarm resets automatically.
Sash High
• When the input configured as Sash High is activated (Micro switch or Proximity switch).
• Red LED on (Flashing).
• Audible alarm sounds (‘Beep’ on/off every 1 sec).
• Audible can be muted via Enter pushbutton -- this silences the alarm and initiates a repeat
timer (factory set to 5 mins) After the delay time the alarm re-sounds (and can be re-muted).
During this time the Red LED flashes on / off.
Reset: - when Sash lowered to safe position and input de-activated.
Night set-back
• When input configured as Night set-back is activated.
• Green LED on (Flashing).
• Audible alarm muted.
Airflow Sensor Error
• The connection and each element of the airflow sensor are monitored at all times. In the
event of a problem with the sensor the audible alarm will sound using a different and
distinctive tone best described as ‘a modulating siren effect’.
• The audible alarm can only be silenced by re-connecting the sensor (if a remote sensor is
being used) or switching the power to the unit off.
AV-670:B-32 10/1/09 2:20 PM Page 12