Model # S984D-1049
Step Controllers - used with series 90 controler to provide proportioning control.
Switches - 5
Timing (min) 1 1/2, 5, 8, and 13 1/2c
13 1/2c Models have a 150F [66C] maximum ambient rating for use in electric duct heater applications where high ambient temperatures are encountered. Longer timing provides stabel operation with narrow throttling range.
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