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Thank you for buying a BIASI SG boiler. The BIASI SG is a cast iron, oil or gas fired hot water boiler, using the famous 3-pass design. The boiler is light, compact, simple, rugged and engineered for maximum home heating efficiency.
Page 4 Biasi SG Series Table of Contents BIASI SG-Series Section Page Important Information &Warnings General Information Boiler Block Assembly &Explosion Diagram Boiler Location Installation of Boiler Trim Kit Components 10-12 Piping the Boiler Intake Venting 14-15 Exhaust Venting Common Exhaust Venting...
Page 5 Biasi SG Series IMPORTANT INFORMATION Please read this page carefully. • • • • ALL BOILERS MUST BE INSTALLED IN ACCORDANCE WITH NATIONAL, STATE AND LOCAL PLUMBING, HEATING AND ELECTRICAL CODES AND ORDINANCES, AS WELL AS THE REGULATIONS OF THE SERVING ELECTRICAL, WATER AND GAS UTILITIES.
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If any of the symptoms of CO occur, or if any of the signs of carbon monoxide are present, VACATE THE PREMISES IMMEDIATELY AND CONTACT A QUALIFIED HEATING SERVICE COMPANY OR THE GAS COMPANY OR THE FIRE DEPARTMENT. ONLY QUALIFIED, LICENSED SERVICE CONTRACTORS SHOULD PERFORM WORK ON YOUR BIASI SG BOILER.
Biasi SG Series 1. General Information The BIASI SG-series boilers are wet base design, sectional, cast-iron boilers for forced hot water heating systems. The boilers are shipped pre-assembled from the factory in lengths from two to seven sections. They are designed for firing with oil or gas power burn- ers, which are packed separately along with the jacket and controls for shipping purposes.
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After assembly of boiler block, seal all joints with boiler gasket and remove boards. NOTE: When cutting off excess length of draw rods, allow enough length to install boiler jacket on the draw rods. Boiler Components & Parts BIASI SG-Series 1) Door Alignment Pin 11) Draw Rod...
Page 9 Biasi SG Series 3. Boiler Location The following are the minimum clearance to construction or combustible materials: 1. 9” from the top, sides, and rear of the boiler. 2. 18” from the flue pipe in any direction. 3. 24” inches from the front of the boiler.
USE ONLY THE ETL LISTED BOILER SYSTEM COMPONENTS AND UL/AGA LISTED GAS BURNER COMPONENTS SUPPLIED WITH THE BIASI SG BOILER. Please refer to figures below for Barometric Damper location (gas burners only) and to the right for the proper location of the trim components.
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Page 11 Biasi SG Series 4.1 Installation of Boiler Trim Components Cont. 1. Install the L7248 aquastat sensor in upper left or right rear tapping using 3/4” immersion well. All tapings and joints should be sealed with piping compound. The L7248 can be adjusted up to 220 F, and should be set to the desired temperature by the installer.
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Biasi SG Series Page 12 4.2 Installation of Boiler Door Hinge 1. Remove the boiler door by unscrewing the two nuts holding the door onto the boiler 2. Take the lower hinge elements (it has the pins on the ends) and place them on the upper and lower studs of the side of the boiler that you want the door to swing towards.
Page 13 Biasi SG Series 5. Piping the Boiler All piping must conform to state and local codes. Page 7 shows the location and size of the boiler tappings. Be sure to allow enough room to clear the casing by installing sufficient sized nipples.
Biasi SG Series Page 14 6. Intake Venting 1. Be certain adequate air is available for combustion and ventilation. a.) Boiler located in unconfined space: Installation in large areas, such as basements can usually be assumed to provide sufficient air.
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Page 15 Biasi SG Series 6. Intake Venting Cont. Tight Construction (as defined by ANSI Z223.1): 1. Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm or less with openings sealed with gaskets, etc..
Biasi SG Series Page 16 7. Exhaust Venting The SG boiler is a high efficiency unit that requires proper venting. The boiler must be vented to the outdoors by means of a tile lined masonry or an approved pre-fabricated chimney of the size and height recommended by the manufacturer or by a listed "power venting"...
Page 17 Biasi SG Series 7.1 Common Exhaust Venting Cont. 3. Insofar as practical, close all building doors and windows and all doors between the space in which the appliance remaining connected to the common venting system are located and other spaces of the building . Turn on any appliance not connected to the common vent system.
Biasi SG Series Page 18 7.2 Gas Venting For boilers connected to gas vents or chimneys, vent installations shall be in accor- dance with part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI Z223.1 or Section 7, Venting Systems and Air Supply for Appliances, of the CAN/CGA B149, Installa- tion Codes, or applicable provisions of the local building codes.
Page 19 Biasi SG Series 8.1 Oil Burner Setup This page is only for boilers using an oil burner. If a gas burner is being used, please refer to page 13 for the proper setup of the burner and gas lines.
Biasi SG Series Page 20 8.2 Gas Burner Setup This page is only for boilers using a gas burner. If an oil burner is being used, please refer to page 12 for the proper setup of the burner. Riello Natural Gas...
Page 21 Biasi SG Series 9. Gas Line Piping Gas supply piping is to be sized and installed properly in order to provide a supply of gas sufficient to meet the maximum demand without undue loss of pressure between the meter and the boiler.
NOTE: Do not attach any electrical wiring, conduit or boiler piping to the to the front (#11) or top panel (#8) of the casing. Boiler Components & Parts Biasi SG — Series Boiler Jacket Assembly: 1) Boiler Body 2) Insulation Surrounding Boiler...
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Page 23 Biasi SG Series 11. Control Panel Sensor installation 1. Install the control panel to the casing bracket as described on the previous page. 2. Insert both the temperature gauge probe and the temperature limit probe from the SG control panel into the immersion well all ready installed in the front of the boiler.
Biasi SG Series Page 24 Panel Aquastat Temperature Range 12. Wiring The electricity to the boiler shall come from a dedicated breaker in the electric service box. A service switch should be mounted on the side of the boiler so the burner tech- nician can service the burner and controls.
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Page 25 Biasi SG Series 12. Wiring Mount the 7248 control to the side of the • casing in the rear of the boiler. Position the aquastat so that the sensor is able to reach the immersion well installed in the back of the boiler where it will be installed.
Biasi SG Series Page 30 13. SG Efficiency Control 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.
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Page 31 Biasi SG Series 13.1 Programming 3. Power up the boiler. When prompted, insert the sensor wire into the jack on the temperature sensor. To confirm, remove the plug when prompted. The unit will then indicate that it has entered “**Config Mode**”. After a four second delay the control will advance to the first programmable parameter.
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Biasi SG Series Page 32 13.3 Sensor Installation The sensor for the SG efficiency control should be installed on the boiler supply pipe of the boiler. It should be positioned as shown in the illustration below and fixed in place with tyraps.
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Page 33 Biasi SG Series 13.4 Efficiency Control Wiring...
15. Maintenance The Biasi boiler system should be serviced once a year. 1. Inspect the boiler and make sure it is operating normally, I.e. temperature and pressure. 2. Inspect the Pressure Relief Valve and manually set it off three times to ensure it is operating normally and not leaking.
Page 35 Biasi SG Series 16. Installer Notes System Checkout: Boiler Model No._________________ Serial No.__________ Original Purchaser: Installer: _________________________ ______________________ _________________________ ______________________ _________________________ ______________________ Burner Manufacturer----------- Type of Oil Burner------------- Burner Model No.-------------- Burner Serial No.-------------- Nozzle Manufacturer------------- Nozzle Spray Angle------------ G.P.H.
Biasi SG Series Page 36 17. Homeowner Information 1) STOP! Read the safety information on the side of the boiler. DO NOT START THE BOILER UNLESS ALL CLEANOUT DOORS ARE SECURED AND SEALED. (Skip to step 9 for oil burning boilers)
LIFETIME WARRANTY-WARRANTY FOR THE CAST IRON BOILER BLOCKS OF THE SG SERIES RESIDENTIAL BOILERS: Biasi warrants that the cast-iron sections and nipples of the BIASI SG boilers are free from defects in material and workmanship for the lifetime of the original single family home installation. If the SG boiler block is then found to be defective, QHT and Biasi will replace the original cast iron boiler block.
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