A.O. Smith DB/DW-720-1810 User Manual page 20

USE ONY TYPE 105°C THERMOPLASTIC OR ITS EQUIVALENT
IF ANY OF THE ORIGINAL WIRES AS SUPPLIED MUST BE REPLACED.
BOILER CONVENTIONAL SYSTEM
USE ONY TYPE 105°C THERMOPLASTIC OR ITS EQUIVALENT
IF ANY OF THE ORIGINAL WIRES AS SUPPLIED MUST BE REPLACED.
ONE BOILER LINEAR-TEMP SYSTEM
FIGURE 15
FIGURE 16
20