Install Instructions

106
107750-01 - 9/17
Status Screen Display Description
Priority:
Standby
Status:
Standby
(burner Off, circulator(s) Off)
Boiler is not ring and there is no call for heat, priority equals standby. The boiler
is ready to respond to a call for heat.
Priority:
Central Heat
Status:
Standby
(burner Off, circulator(s) On)
Boiler is not ring. There is a Central Heat call for heat and the Supply temperature
is greater than setpoint minus the “Diff Below”.
Priority:
Central Heat
Status:
Prepurge
When supply temperature drops burner demand continues with following Status
shown:
Safe Startup: Flame circuit is tested.
Drive purge: The blower is driven to the fan purge speed.
Prepurge: After the blower reaches the fan purge speed setting the
combustion chamber purge is conducted.
Priority:
Central Heat
Status:
Direct
ignition
After purge time is complete the following Status is shown:
Drive light-off: The blower is driven to light-off rate.
Pre-Ignition Test: After the blower reaches light-off rate a safety relay test is
conducted.
Pre-ignition: Spark is energized and it is conrmed that no ame is present
Direct Ignition: Spark and Main fuel valve are energized.
Priority:
Central Heat
Status:
Running
(burner On, circulator(s) On)
After ame is proven the sequence continues with run stabilization and low
re hold time. Once the eld adjustable low re hold time is completed normal
boiler operation begins, modulation rate depending on temperature and setpoint
selections.
Priority:
Domestic
Hot Water
Status:
Running
If the Central Heat call for heat is active and a Domestic Hot Water (DHW) call for
heat received the DHW demand becomes the “priority” and the modulation rate,
setpoint, “Diff Above” and “Diff Below” are based on DHW settings.
Priority:
Standby
Status:
Post-purge
(burner Off, circulator(s) Off)
If there is no call for heat the main fuel valve is closed and the blower is driven
to the fan post-purge speed. After the blower reaches the fan post-purge speed
setting the combustion chamber purge is conducted.
Priority:
Standby
Status:
Standby
Delay
Standby delay status is entered when a delay is needed before allowing the burner
control to be available. Select “Help” button from the “Home Screen” to determine
the cause of the Standby Delay.
Priority:
Standby
Status:
Lockout
A lockout status is entered to prevent the boiler from running due to a detected
problem. Select “Help” button from the “Home Screen” to determine the cause of
the Lockout. The last 5 Lockouts are recorded in the Lockout History.
XII. Operation (continued)
E. Boiler Sequence of Operation
1. Normal Operation
Table 12.3: Boiler Sequence of Operation