Sg Efficiency Control - Biasi SG 2 Manual And Installation Instructions

Page 30
The SG boiler is available with an efficiency control. The control is installed into the SG
control panel from the factory. It is pre wired and uses the same quick connections as the
standard control panel. Installation of the SG efficiency control panel is the same as the
standard control panel. Please follow the steps on page 23. Please follow the additional steps
below to complete the installation.
ON/OFF SWITCH
PRESSURE GUAGE
The following parameters may be changed in the field by following these instructions.
Pre-purge time, Degrees F or C, Heating Water Low-Limit, Domestic Water
Low-Limit, Maximum Hold Off Time, Standby Time Override,
Economizing Time and Run Time Display.
It is very important that if there is any kind of a delay (more than fifteen seconds), from
the time that the Operating-control calls for the burner to start and the burner actually
starts, that this time delay value be entered into the controller as a Pre-Purge time (e.g.
actual pre-purge timer, Flue Damper interlock, etc.). If there is a delay and the correct
value is not programmed into the controller, the savings calculations will be incorrect.
All programming is achieved by inserting and removing a water temperature sensor into
the DOM SENSOR connector, when directed to do so via the display on the controller.
The sensor must be connected to the cable or this will not work!
1. Turn all power to the boiler off. Remove the front and top panels from the boiler.
Remove the two screws from the top of the SG control panel and swing the face of
the panel open. You will now be able to see the efficiency control.
2. Remove the sensor wire from the heat sensor port and insert it into the domestic
sensor port. Make sure that the sensor is unplugged from the other end of the sensor
wire. Return the control panel to the closed position.

13. SG Efficiency Control

TEMPERATURE
GUAGE
OPERATING AQUASTAT
13.1 Programming
Biasi SG Series
BY-PASS SWITCH
EFFICIENCY CONTROL