Burnham SCG User Manual
Page 46
46
draining the heating system. Many probe LWCO
manufacturers recommend an annual inspection of the
probe.
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 45-1100) 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 fi lling the system.
The boiler should attempt to operate once the water
level is above the LWCO.
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Connect system supply and return piping to boiler.
See Figures 25 and 26. Maintain minimum ½ inch
clearance from hot water piping to combustible
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D.
Install circulator with fl 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
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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
fl 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.).