Hubbell Electric Heater Company SLN - Manual (Page 6)

6
OUTER SHELL AND INSULATION
The tank is encapsulated in 2-inch thick polyurethane foam insulation. The insulation is protected by a
high impact non-corroding colorized composite protective jacket.
THERMISTOR CLIP
The water heater is supplied with a thermistor clip located just above the heating coil tank flange for
attaching a sensing probe to the water heater tank. Temperature sensors and controls are not included
with the water heater.
OPTIONAL BACK-UP ELECTRIC HEATING SYSTEM
Back-up Electric Heating Element
The water heater may be supplied with an electric immersion heating element assembly(s), composed
of a copper sheathed element(s) that are brazed into a brass flange. Each assembly is fastened to a
corresponding tank flange using a gasket and four (4) 3/8-16 x 1-inch long hex head steel bolts and
nuts. See drawing for voltage and power ratings.
Control Thermostat
The water heater may be supplied with either a surface mounted or immersion thermostatic switch to
control the back-up electric heating system. See drawing for specific details. The surface mounted
thermostat can be adjusted through a range of 110° - 170° F. The immersion thermostat can be adjusted
through a range of 100° - 190° F. Both thermostats are adjustable with a flat tip screwdriver.
Surface Mounted Thermostat
Immersion Thermostat