T4398A,B HIGH PERFORMANCE ELECTRIC HEAT THERMOSTATS
68-0147—2 6
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.