Installation / Operation Instruction Manual

Page 112
Table 26. Control Management Values and Descriptions
10.E.8 Inter-Purge
In Inter-Purge mode, the blower will modulate to Inter-
purge Fan Speed and the gas valve(s) will de-energize.
The boiler/heater will stay in Inter-Purge mode until the
Inter-Purge Timer expires. Once the Inter-Purge Timer
expires, the boiler/heater will transition to Pre-Ignition
mode. If a lock-out condition occurs during Inter-Purge
mode, the boiler/heater will transition to Lock-out mode.
If the call for heat is removed during Inter-Purge, the
boiler/heater will transition to Post-Purge mode prior to
returning to Standby mode.
10.E.9 Post-Purge
In Post-Purge mode, the blower will run at the Post
Purge Fan Speed, the spark and gas valve are o󰀨.
The boiler/heater will stay in Post-Purge mode until
the Post-Purge Timer expires. Once the Post-Purge
Timer expires, the boiler/heater will transition to Standby
mode.
NOTE: The duration of post-purge is established to
ensure proper evacuation of any unspent fuel in
the combustion chamber and ue collector.
Timer Value Description
Pre-Purge APS
Max Open Time
5 seconds The max time the boiler/heater will wait for the APS to close.
Pre-Purge APS
Closed Time
30 seconds The APS has to be closed for this amount of time prior to mode transition.
Pre-Ignition Time 10 seconds With the blower at Ignition Speed, the spark will be on for this amount of
time prior to mode transition.
Pilot Flame
Establishing Period
10 seconds After the pilot valve is energized, this is the maximum amount of time the
boiler/heater will try to ignite the pilot prior to mode transition.
Main Flame
Establishing Period
4 seconds After the main valve is energized, this is the maximum amount of time the
boiler/heater will try to ignite the main prior to mode transition.
Inter-Purge Timer 15 seconds If the boiler/heater fails to ignite, and the maximum number of ignition
attempts has not been exceeded, the boiler/heater will wait for the Inter-
Purge Timer to expire prior to entering Pre-Ignition mode.
Post-Purge Timer 30 seconds If the boiler/heater fails to ignite, and the maximum number of ignition
attempts has been exceeded, the boiler/heater will keep the blower(s) on
until the Post-Purge Timer has expired.
Flame Signal Lower
Threshold
0.8 uAmps Flame is considered absent if the ame signal is below the lower
threshold
10.E.10 Lock-out
In Lock-out mode, the blower will shut down, the spark
and gas valve are o󰀨. The boiler/heater will stay in
Lock-out mode until the Lock-out Timer expires and the
lock-out condition has been manually reset. Once both
conditions have been satised, the boiler/heater will
transition to Standby mode.