Instruction/ maintenance manual of the product 21D83M-843 White Rodgers
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21D83M-843 Integrated Single Stage Fur nace Control Replacement Kit F AILURE T O READ AND FOLLO W ALL INSTRUCTIONS CAREFULL Y BEFORE INST ALLING OR OPERA TING THIS CONTROL COULD CA USE PERSONAL INJUR Y AND/OR PR OPER TY D AMA GE.
2 SPECIFICA TIONS ELECTRICAL RA TINGS [@ 77°F (25°C)]: Input V oltage: 25 V AC 50/60 Hz Max. InputCurrent@25 V A C: 0.45 amp Rela y Load Ratings: V alve Rela y: 1.5 amp @ 25 V AC 50/60 Hz 0.6 pf Ignitor Rela y: 2.0 amp @ 120 V AC 50/60 Hz (resistive) Inducer Rela y: 2.
3 WARNING ! FIRE HAZARD • Donotexceedthespeciedv oltage. • Replace existing contr ol with exact model and dash number . • Protect thecontrol from directcontact withwater (dripping, spraying, rain, etc.
4 INST ALLA TION ov er the marks. Use the mounting panel as a template to drill 3/16" holes through each of the holes marked "A". Install the replacement control in the freshly drilled holes in the blo wer access panel. Use aluminum tape to seal the unused holes .
5 OPERA TION OPTION SWITCHES The option s witches on the 50A66-843 control are used to determine the length of the heat delay-to-f an-off and cool-dela y-to-fan-off periods. The f ollowing tab le shows the time periods that will result from the various s witch positions.
6 OPERA TION SYSTEM LOCK OUT AND DIA GNOSTIC FEA TURES COOL MODE In a typical system, a call f or cool is initiated by closing the ther mostat contacts. This energizes the 50A66-843 control's cooling sequence. The compressor is energized and the dela y-to-fan-on period begins.
7 DIA GNOSTIC T ABLE DS 1 (Red) DS 2 (Green) Error/Condition Comments/T roubleshooting Simultaneous slowash Simultaneous slo w ash Normal operation No f ault Simultaneous fastash Simult.
White-Rodgers is a business of Emerson Electric Co. The Emerson logo is a trademark and ser vice mark of Emerson Electric Co. HOMEO WNER HELP LINE: 1-800-284-2925 www .
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