Water temperature below

Faulty thermostat.

Check thermostat adjustment.

settings at all times

 

Monitor thermostat as described

 

 

in Section III, Quarterly

 

 

Inspection. Replace if necessary.

 

Heating element not working on all

Check to see that heating

 

phases

element is working on all

 

 

phases, by checking the

 

 

resistance (ohms) value for each

 

 

element and comparing with the

 

 

chart included in Section VI.

 

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

Excessive temperature or pressure

Temperature and pressure relief

continuously

in tank

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.

19

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Hubbell Electric Heater Company A manual

A specifications

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