Boiler Head Loss - VX 110
Flow rate (gpm) 2 4 6 8 10 12 14
Head @ flow (ft) 0.18' 0.51' 0.99' 1.59' 2.49' 3.55' 4.75'
Table 6 Boiler Head Loss
Boiler Head Loss - VX 150
Flow rate (gpm) 4 6 8 10 12 14 16
Head @ flow (ft) 0.42' 0.9' 1.52' 2.26' 3.25' 4.31' 5.61'
Table 7 Boiler Head Loss
Boiler Head Loss - VX 199
Flow rate (gpm) 4 7 10 13 16 19 22
Head @ flow (ft) 0.44' 0.9' 1.73' 2.91 4.36 6.23' 8.4'
Table 8 Boiler Head Loss
Ensure that the pump is rated for the design circulating water temperatures; some pumps have a
minimum water temperature rating above the low temperature potential of the boiler. Following
installation, confirm the actual performance by measuring Δ°T (under high and low flow conditions)
after establishing the correct firing rate.
To use legacy heat, we recommend water flow after burner shutdown. There can be significant
build-up of energy due to the volume of heated water in the system. Default load settings will run
the boiler’s primary pump for up to 5 minutes (300 seconds) after burner shutdown. Secondary
pumps can be set to run up to 15 minutes after burner shutdown (for the last calling load). As
shipped, the default settings will run the Load pump for 5 minutes to place the legacy heat where it
is useful. Any secondary pump can be set to run for 0 – 900 seconds in the heat purge mode. Guard
against deadheading pumps when all zone valves are closed by setting the load Pump Post Purge
(sec) to '0'.
To allow pump purge after burner shut-down, the primary pump must be under the control of the
boiler.
To simplify the control application, promote good loads and flow management, installers must
conform to the piping design configurations provided.
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