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50
10) Check the inlet pressure and adjust if necessary. Verify that the inlet pressure is between the upper and lower limits shown
on the rating plate with all gas appliances on and off.
WARNING
THE OUTLET PRESSURE FOR THE GAS VALVE HAS BEEN FACTORY SET
AND REQUIRES NO FIELD ADJUSTMENT. THIS SETTING IS SATISFACTORY
FOR BOTH NATURAL GAS AND PROPANE. ATTEMPTING TO ADJUST THE
OUTLET PRESSURE MAY RESULT IN DAMAGE TO THE GAS VALVE AND
CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
7) Start the boiler using the lighting instructions on page 49. After the boiler is powered up, it should go through the following
sequence.
Sequence Display Meaning
1
U.125 or Blank Checking internal software (power-up only)
2
0.SWT Boiler in standby. SWT = Supply Water Temp. No call for heat.
(After call for heat from heating thermostat)
3
A.SWT Self-Check on Start-up
4 5.SWT Blower and circulator on. Checking for adequate air fl ow.
5 1.SWT Prepurge
6 2.SWT Trial for ignition
7
3.SWT Flame established. Boiler responding to a call for heat.
8) Upon initial start-up, the gas train will be fi lled with air. Even if the gas line has been completely purged of air, it may take
several tries for ignition before a fl ame is established. If more than 5 tries for ignition are needed, it will be necessary to
press the reset button to restart the boiler. Once a fl ame has been established for the fi rst time, subsequent calls for burner
operation should result in a fl ame on the fi rst try.
9) Inspect the fl ame visible through the window. On high fi re the fl ame should be stable and mostly blue (Fig.11.1). No yellow
tipping should be present; however, intermittent fl ecks of yellow and orange in the fl ame are normal.
Figure 11.1: Burner Flame