Selectra Series 21/31 electronic
gas flame modulation systems are designed primarily for make-up air heating
as components of indirect fired units with atmospheric burners. Series
21 is designed for single furnace operation, and the Series 31 is capable
of handling up to four furnaces. They may be field installed on existing
equipment or specified for new equipment installation.
Series 21/31 systems use Modulator or Modulator-Regulator valves. Please
see Maxitrol Bulletin MT2035-10/02 for M/MR valve selection and application
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