Selectra ® Series 21 electronic gas flame modulation systems are designed primarily for make-up air heating, as components of indirect fired units with atmospheric burners.Combining the capability of the Series 21 and 31, the current Series 21 is designed for single or multiple (up to four) furnace operations. It may be field installed on existing equipment or specified for new equipment installation.
The Series 21 systems use Modulator or Modulator - Regulator valves. Please see Maxitrol Bulletin MMR_MT_EN for M/MR valve selection and application table.
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