SG Series Boilers – Installation and Service Manual
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1.6.3 OPERATING CHECKOUT
After adjusting parameters, put the boiler into operation and observe operation through at least one
complete cycle to make sure that the controller operates properly. See controller troubleshooting section
to assist in determining boiler operation.
The sensor should fit snugly and should touch the bottom of the well for best temperature response. The
sensor is held inside the well using the well clip.
1.6.4 THERMAL PURGE
The intent of thermal purge is to ensure usable residual heat in the boiler is circulated until it is sufficiently
depleted from the system before the burner is allowed to fire. To that end, on a call for heat, the burner
remains off while the circulator runs until the boiler temperature drops to the thermal purge temperature
limit or the time delay is exceeded. Both of these parameters are adjustable. When the boiler temperature
falls below the thermal purge temperature limit or the time delay expires, the burner is allowed to fire.
In addition to the thermal purge temperature and thermal purge time delay parameters, two other
conditions release the integrated boiler controller from thermal purge and allow the burner to run in order
to maintain comfort in the space:
• The boiler temperature has dropped 10 °F from the boiler water temperature measured at the
beginning of the call for heat.
• Boiler temperature is cooling at a rate greater than 5 °F/minute while the circulator is running.
1.6.5 OPERATING STATE CODES AND TROUBLESHOOTING
When there is a problem during a call for heat or boiler operation, the controller provides specific
information to help resolve the issue quickly. If the controller is displaying “StA” by a number, use the
state code definitions in the Table 3 to determine the problem and possible causes.
1.6.6 CONTROLLER MOUNTING
The controller has four tabs which align with four slots in the control panel. To remove the controller,
press and hold in the bottom two tabs while simultaneously rotating the controller about 45 degrees to
unhook the top two tabs.
Rotate 45°
PRESS and HOLD
both tabs while
rotating controller
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