White-Rodgers 21M51U-843


Control, Hot Surface Ignition, 2 Retries

21M51U-843 2242611
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ItemUniversal Ignition Control
TypeHot Surface Ignition
Lead Length (In.)15-1/2
Electrical Connections1/4 Spade Terminals And Molex Plugs
Probe Length (In.)15-1/2
Amps AC0.45
Control Volts24
Depth (In.)1-1/4
Electrical Ratings24 VAC
Gas TypeLP/NG
Height (In.)8
Igniter Warm-Up Time (Sec.)17
Prepurge Time (Sec.)15
Width (In.)5-1/4
For Use With Residential, Commercial Heating Equipment
Includes Ignitor
Weight 1.400000


Universal Ignition Control, Hot Surface Ignition, Lead Length (In.) 15-1/2, Electrical Connections 1/4 Spade Terminals And Molex Plugs, 24 VAC, Gas Type LP/NG, Prepurge Time (Sec.) 15, For Use With Residential, Commercial Heating Equipment, Includes Ignitor

Universal System Controls
  • 3XA74 is universal for comparative silicon carbide modules. Features interchangeable program keys for quick configuration. 3XA75 replaces White-Rodgers 50A50 and 50A55 series modules. 3XA76 replaces White-Rodgers 50A65 series nitride modules. 1TGD8 allows 100% gas shutoff if main burner does not light after ignition trial. 3CGE1 features twinning capability and LED indicators. Compatible with EnviraCom thermostats and remote monitoring and diagnostic systems (see page 4566). 1RZZ2 is for single- and dual-rod remote sense applications.
  • 1/4" quick-connect Gas type: LP/NG

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