base
A
33
IOM74 November 2020 R105
80 Gas Valve Wiring
Gas valve feedback has power before the FR and SR contact are energized.
81
Gas Valve out of
range
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.
86 High Limit
High limit safety tripped due to excessively high temperature.
87
Flame Relay
Wiring
within 500ms of activating the Flame relay
output.
88 Flame Failure
Gas valve feedback has no power after 1 minute of enabling the Flame relay
output.
91
Low Velocity Air
Switch
Occurs if the pressure drops below the low pressure setpoint during modulation
for more than 40 seconds
92
High Velocity Air
Switch
Occurs if the pressure goes above the High pressure setpoint during modulation
for more than 90 seconds
94 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 the sequence has already
passed the purge status and has lit. See “Low velocity Air Switch” alarm
95
Low Pressure
Sensor
If the pressure is greater than the Very low pressure setpoint before the
damper is opened for more than 1 minute.
96
Very Low
Pressure
Occurs if the pressure drops below
the very low pressure setpoint after the
purge has been completed.
97
Far Sensor Flame
Failure
Occurs if a secondary flame rod is enabled and flame sensing
20 seconds after the pilot valve drops out on consecutive attempts.
61
Pressure
Overflow
SH is in normal operating mode and the drain temperature is greater than 110
deg F for longer than 10 seconds
62 Water Foaming
Low water probe made and fill valve open for less than 2 minutes during
normal operation
63
Failed Water
Supply
open longer than the required time (varies on current
mode: Normal operation: 5m; Complete fill: 1hr)
64 Failure to Drain
Low water probe covered and drain valve open for longer than 1 hour
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