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Maxitrol Selectra Electronics
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Series 20/30 Electronics 
Series 20/30 electronic gas flame modulation systems are designed primarily for commercial and light industrial space heating as components of indirect fired units with atmospheric burners. The Series 20 is designed for single furnace operation, and the Series 30 is capable of handling up to four furnaces.

The Series 20/30 systems use Modulator or Modulator-Regulator valves. Please see Maxitrol Bulletin MT2035-10/02 for M/MR valve selection and application table.
 
Literature  
Series 20/30 Installation Instructions & Field Service Checklist [MI 2044] 01/04
Modulator/Modulator-Regulator Valves [MT 2035] 07/05
   
System Components
Options
      AMPLIFIER   TEMP  
SELECTRASTAT
 
TEMP
  SENSORS  
TEMP
  REMOTE
SELECTORS
TEMP
Series 20
Single Unit
   
A1010A
 
Base Model
 
T120
 
60° - 85°F
 
TS120
 
Space Temp
(no mixing tube)
  TD120 60° - 85°F
(Space)
   
A1010B
 
w/ High Fire Ignition
             
  Series 30
Multiple Units
A1011A
Base Model
A1011B
w/ High Fire Ignition