How to Wire
Ensure power is turned off to boiler.
Locate the LWCO jumper wire in the factory wiring harness. Remove the jumper wire and install
the LWCO wiring from LWCO Model
How to Test
Shut off fuel supply. Lower water level until water level is BELOW the LWCO. Generate a boiler demand by turning up thermostat. Boiler should not attempt to operate. Increase the water level by filling the system. The boiler should attempt to operate once the water level is above the LWCO.
NOTICE
Ensure the location of the LWCO in the piping will allow for connection of the LWCO wiring harness to the factory wiring of the SCG.
C.Connect system supply and return piping to boiler. See Figures 25 and 26. Maintain minimum ½ inch clearance from hot water piping to combustible materials.
NOTICE
Burnham recommends sizing the system circulator to supply sufficient flow (GPM) to allow a 20°F temperature differential in the system. When sizing the system circulator, the pressure drop of all radiators, baseboard and radiant tubing and all connecting piping must be considered.
D.Install circulator with flanges, gaskets and bolts provided. Circulator harness allows circulator to be mounted on supply or return. Connect harness to circulator and secure any excess conduit.
E.Install supply manifold, pressure/temperature gauge and pressure relief valve.
See Figure 24. Pressure Relief Valve must be installed with spindle in vertical position. Installation of the relief valve must comply with the ASME Boiler and Pressure Vessel Code, Section IV.
WARNING
Pressure relief valve discharge piping must be piped such that the potential of severe burns is eliminated. DO NOT pipe in any area where freezing could occur. DO NOT install any
F.Space heating and domestic water heating with Alliance™ water heater. Install Alliance water heater as a separate heating zone. Refer to Alliance Installation, Operating and Service Instructions for additional information.
G.If boiler is used in connection with refrigeration systems, boiler must be installed with chilled medium piped in parallel with the heating boiler using appropriate valves to prevent chilled medium from entering boiler, see Figure 23.
Figure 23: Recommended Piping for Combination
Heating & Cooling (Refrigeration) System
H.If boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air, boiler piping must be equipped with flow control valves to prevent gravity circulation of boiler water during operation of cooling system.
I.Use a boiler bypass if the boiler is to be operated in a system which has a large volume or excessive radiation where low boiler water temperatures may be encountered (i.e. converted gravity circulation system, etc.).
46
