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Raise DHW aquastat above tank temperature to call for heat.
4.
•
Blower/DHW circulator on. Blower and DHW cir-
[5150]
culator energize and control checks for air flow.
•
[1150]
Prepurge. Blower speed will increase to ignition
speed. The blower will run in prepurge for 10 seconds.
•
ignition. After prepurge, the control module
[2150]
opens the gas valve and starts ignition spark.
•
If burner flame proves within 4.5 seconds, burner con-
tinues to fire. Burner will fire at startup rate for about
10 seconds to allow flame to stabilize.
•
If burner flame does not prove within 4.5 seconds, con-
trol module attempts ignition sequence again. Flame
must prove within 6 attempts or control will lockout (dis-
play will show [E 02]).
•
Verify flame failure operation by closing boiler manual
gas valve to prevent gas flow. Open gas valve after
testing.
•
Burner on, DHW. Once flame is proven and
[4150]
stable, the burner is allowed to modulate. Firing rate
depends on actual outlet water temperature versus
target temperature.
Allow boiler to bring water temperature to target tem-
5.
perature.
•
Target temperature reached. The burner will
[6150]
shut down. The blower will run in postpurge (see be-
low), then turn off. DHW circulator continues to run as
long as there is a call for DHW heating.
IV - BOILER STARTUP
Lower DHW aquastat to stop call for heat.
6.
•
[1150]
(call for heat ended), burner turns off. Blower will con-
tinue for 15 second postpurge, then turn off. If another
DHW heat call occurs, boiler will begin heating cycle
after 30 second delay.
•
[8150]
continues to run for 30 seconds.
•
[0150]
(waiting for heat call).
Repeat steps 1-6 several times to verify operation.
7.
Return the DHW aquastat to normal setting.
8.
To check operating conditions (Ex.- actual or target tem-
1.
perature), see "User Interface Quick Reference" in sec-
tion X of this manual for an explanation of the boiler
control's "Information" mode.
During normal operation (no shutdown or lockout), the
2.
right 3 display digits show actual boiler outlet water tem-
perature.
PERFORM CHECK-OUT PROCEDURES
Complete the "Checkout Procedures and Adjustments" as in-
dicated in Section VI of this manual.
Replace boiler front jacket panel after
8
Postpurge. When room thermostat is satisfied
DHW circulator run-on. The DHW circulator
No call for heat. Boiler is now in standby mode
OPERATING INFORMATION
WARNING
!
performing any service to the boiler.
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