Honeywell T4398A1021 User Guide - Page 6

T4398A,B HIGH PERFORMANCE ELECTRIC HEAT THERMOSTATS OPERATION The T4398 Thermostat provides precise temperature control of resistance-rated electric baseboard heating equipment with minimum droop. The T4398 controls room temperature within 2°F (1°C), regardless of the load of the baseboard heater. The vapor-filled dual diaphragm sensing element is more sensitive to temperature changes than a bimetal sensor. This accuracy, usually associated with low voltage thermostats, is now available for line voltage control. Electric heat thermostats are often affected by the heat generated in the control. Temperature control points can vary or droop 2° to 4°F (1° to 3°C) depending on the load demand. Temperature settings are adjusted to offset this. The T4398 provides precise control with minimum droop. This allows better control of room temperatures from day to night and season to season while saving energy. 68-0147-2 6