SECTION I
- GENERAL INFORMATION
GENERAL DESCRIPTION
This book describes a packaged electric water heater that is a stationary, self-contained unit.
The complete assembly consists of the storage tank, immersion electric heating element(s),
thermostat, safety relief valve, safety high temperature cut out, and any other required electrical
operating control. Optional equipment may be supplied with your unit. Please consult the
product drawing for details specific to your assembly. The unit is factory assembled, insulated,
jacketed, painted, wired, tested, and ready for electrical and plumbing service connections.
CONSTRUCTION
TANK
The one-gallon storage tank is constructed of stainless steel and is designed for a maximum
allowable working pressure of 150 psi (300 psi TP).
TANK CONNECTIONS
The heater is supplied with separate ¼” MNPT cold water and hot water connections. A ¾-inch
FNPT connection is located on the side of the heater for mounting a combination safety
temperature and pressure relief valve. An overflow line should be utilized from the relief valve
outlet to a floor drain. See drawing for locations and sizes.
HEATING ELEMENT
The water heater is supplied with
either a 1000 watt or a 450-watt
electric immersion heating element
assembly, rated for 120 volts, and
composed of a copper sheathed
element that is brazed into a 1” NPT
brass plug.
TEMPERATURE HIGH LIMIT SWITCH
As a safety device, a surface mounted high temperature cut-off
switch with manual reset, factory set at 190° F, is provided. In the
event of an over-temperature condition, the thermostat will
disengage the power from the system. If this switch operates, do
not attempt to reset. A dangerous situation is indicated and a
qualified service person should be called to find the source before
the unit is operated again.
Manual Reset
CONTROL THERMOSTAT
The temperature of the water in the heater is regulated by the
adjustable, automatic, immersion thermostat located behind the
jacket front cover. This automatic control is set at the factory to
maintain a water temperature of 125°F to reduce the risk of scald
injury. The thermostat dial is graduated with markings form 1 to 10
with 10 being the hottest.
Capillary Tube and Bulb
6