Honeywell T4398B Manuel d'utilisateur télécharger pdf (Page 7)

T4398A,B PRECISION ELECTRIC HEATING THERMOSTAT

7 69-1604

Frost Protection (T4398A)

When the ambient temperature falls to 40°F (4°C), the vapor

in the diaphragm changes into liquid. The diaphragm collapse

to a fraction its original thickness, turning on the heat,

regardless of setpoint. This feature guarantees minimum, yet

reliable, operation of heaters in spaces near freezing.

NOTE: To prevent heat from turning on below 40°F (4°C),

turn off the circuit at the breaker panel, or install a

T4398B.

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Honeywell T4398B Manuel d'utilisateur Page 7