Optional external tridicator gauge:An internally mounted tridicator is factory-installed. An
external tridicator can be fitted if required by local jurisdiction.
Flow direction:To supply manifold
Flow direction:From return manifold
Drain with cap
Figure 37 Multiple boiler piping - four staged boilers, single load
Supply to heating system.
Secondary loop sensor (to master boiler).
Closely-spaced tees are a maximum of four pipe diameters apart, with a minimum of
eight pipe diameters of straight piping upstream of the first tee and a minimum of four
pipe diameters of straight piping downstream of the second tee.
Return from heating system.
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