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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 1100-H4
(P/N 100592-01) into the plug of the SCG factory
wiring.
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 lling 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 sufcient ow (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 anges, 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.
Figure 23: Recommended Piping for Combination
Heating & Cooling (Refrigeration) System
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 shut-off
valves, plugs or caps. Consult Local Codes for
proper discharge piping arrangement.
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.
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
ow 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.).