8
IV - BOILER STARTUP
Raise DHW aquastat above tank temperature to call for heat.
4.
[5150]
•
Blower/DHW circulator on. Blower and DHW cir
-
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.
[2150]
•
ignition.
After prepurge, the control module
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.
[4150]
•
Burner on, DHW. Once flame is proven and
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.
[6150]
•
Target temperature reached.
The burner will
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.
Lower DHW aquastat to stop call for heat.
6.
[1150]
•
Postpurge.
When room thermostat is satisfied
(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]
•
DHW circulator run-on. The DHW circulator
continues to run for 30 seconds.
[0150]
•
No call for heat. Boiler is now in standby mode
(waiting for heat call).
Repeat steps 1-6 several times to verify operation.
7.
Return the DHW aquastat to normal setting.
8.
OPERATING INFORMATION
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
performing any service to the boiler.
WARNING
!
