CenCon
38
ALARM DESCRIPTION
Flame Failure
Gas valve feedback has no power after
1 minute of enabling the Flame relay
output.
Gas valve feedback has power before the FR and SR contact are energized.
Flame Relay Wiring
Received a gas valve feedback within 500ms of activating the Flame relay
output.
Gas Valve out of range
When ball valve is enabled this alarm occurs if the gas actuator feedback is
greater or less then the demand by 10% for more then 60 (Default is currently
variable) seconds.
Low Velocity Air Switch
Occurs if the pressure drops below the low pressure
setpoint during modulation
for more than 40 seconds
High Velocity Air Switch
Occurs if the pressure goes above the High pressure setpoint during modulation
for more than 90 seconds
pically reversed sensor connections
Low Pressure
Alarm occurs if the pressure is less than the low
pressure setpoint plus 0.05" wc
after the damper is opened and the blower has been commanded to start for a
minute. This alarm will not be triggered if we have already passed the purge
status and have lit. See Low velocity air Switch alarm
Low Pressure Sensor
If the pressure is greate
r than the Very low pressure setpoint before the damper
is opened for more than 1 minute.
Very Low Pressure
Occurs if the pressure drops below the very low pressure setpoint after the
purge has been completed.
Far Sensor Flame Failure
abled and we lose flame sensing
than 20 seconds after the pilot valve drops out on consecutive attempts.
Profile Pressure Setpoint
Non-adjustable trip setpoints noted in the table below, measured as in.wc. (Pa). If the unit is designed for
variable air volume, the pressure trip points are scaled slightly to allow the profile damper actuator time to
move and rebalance the profile pressure drop.
Time to trip on failures:
Heating Enabled Response Time No Heat (Ventilation) Response Time
Very Low
1 Second
Low
1 Minute
Actual less than Low 40 Seconds Actual less than Low 1 Minute
High
90 Seconds
High
No failure
To Next Page
Loading...
