Product Description
White Rodgers Furnace Board Part number 21V51U-843.
This is a Universal Two-Stage HSI Integrated Variable Speed (ECM) Circulator Furnace Control Kit.
FEATURES
- 16-pin variable speed circulator output for ECM (Electronically Commutated Motor), dipswitch selectable for OEM applications two-speed inducer output,
- 2-stage gas valve output Pushbutton fault history retrieval.
- Furnace status LED tri-color (green, red and amber).
- Heat fan off delay (dipswitch selectable), fan on delay for cooling.
- Auto second stage delay (dipswitch selectable).
- 120 VAC humidifier output/120 VAC electronic air cleaner output.
Features
- 120 VAC Ignitor Output
- 120 VAC Two-Speed Inducer Output
- 120 VAC Humidifier Output
- 120 VAC Electronic Air Cleaner Output
- 2-Stage Gas Valve Output
- 16-Pin Variable Speed Circulator Output
- OEM Application Dipswitch Selectable
- Fuse Protection 3 Amp
- Furnace Status LED Tri-Color (Green, Red and Amber)
- CFM LED (Green)
- Heat Fan OFF Delay (Dipswitch Selectable)
- Fan ON Delay for Cooling
- Auto Second Stage Delay (Dipswitch Selectable Mode)
- Historical Fault Retrieval by Pushbutton
- YLO, Y, W, W2, R, G, C, O, BK/DS/Dehum Terminals
- Pressure Switch Inputs and Monitoring
- Flash Microprocessor with Non-Volatile Memory
- Flame Current Measurement Points
Replaces:
All White-Rodgers 50V51-XXXs
and 50V61-XXXs Two-Stage HSI Systems
with 80V or 120V Ignitor.
