
LTRx-512 Installer’s Guide 
Wiring Diagrams 
37 
TYPE 20 - 
THREE WIRE MINUTE IMPULSE (44
TH
 MIN.)
 
 
 
 
All circuits should be fused or protected by a circuit breaker (10Amp maximum)
 
 
TYPE 21 - 
CINCINNATI ‘D1’
 
 
 
 
All circuits should be fused or protected by a circuit breaker (10Amp maximum)