Hubbell-electric-heater-company B Manuel d'utilisateur télécharger pdf (Page 18)

Faulty thermostat. Check thermostat adjustment.

Monitor thermostat as described

in Section III, Quarterly

Inspection. Replace if necessary.

Heating element not working on all

phases

Check to see that heating

element is working on all

phases, by checking the

resistance (ohms) value for each

element and comparing with the

chart included in Section VI.

Water temperature below

settings at all times

Heater improperly sized Verify heater is properly sized

for the flow rate and temperature

rise of your system. See formulas

included in Section VI. Replace

elements with proper size as

necessary.

Relief valve discharges

continuously

Excessive temperature or pressure

in tank

Temperature and pressure relief

valves are made to operate if the

water temperature exceeds

210°F or water pressure exceeds

the pressure rating of the safety

relief valve. If trouble is

excessive temperature, then

thermostat is not shutting off at

the right setting and thermostat

must be replaced.

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Hubbell-electric-heater-company B Manuel d'utilisateur Page 18