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CONSTRUCTION
TANK
The storage tank is designed, manufactured, and stamped in accordance with ASME section VIII Division 1.
The tank is constructed of type 304L stainless steel for maximum tank longevity and fabricated by all welded
construction and is designed for a maximum allowable working pressure of 150 psi (225 psi TP).
TANK CONNECTIONS
The heater is supplied with separate connections for the cold/warm inlet and the hot water outlet. Water entering
the warm water inlet and leaving through the hot water outlet is evenly circulated by means of a diffuser within
the tank. A ¾-inch FNPT connection is provided 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 an electric immersion heating
element assembly(s), composed of copper sheathed elements that are
fitted into a brass 1½-12UNF screw plug with 1-7/8” hex. Each
assembly is threaded into the tank and sealed with an o-ring gasket.
See drawing for voltage and power ratings.
MAGNETIC CONTACTOR
The definite purpose magnetic contactor(s) is a heavy-duty resistive load type.
The contactor supplies power to the heating element(s) based on the resistive
load (non-inductive) of the heater only when the relay on the control board is
closed, thereby pulling in the contacts until the desired temperature is reached.
At this point, the contacts will drop out, which in turn disconnects power from
the elements. Units with two contactors will turn on and off in stages.
CONTROL BOARD AND DISPLAY
The control board supplies all the necessary
function for heater operation. These include
control temperature, hi-limit cut-out, low
water detection, and leak detection.
LOW VOLTAGE CONTROL TRANSFORMER
A control circuit transformer is supplied with all models rated greater than 240-volts.
This component is used to step down the primary power supply (600, 480, 440, 415,
or 380) to 208/240-volts for safety when working with control circuits.
POWER CIRCUIT BREAKERS
When required by code, a magnetic power circuit breaker is
supplied for circuit overload protection. The circuit breaker
can be reset in the event of a current overload.
OUTER SHELL, INSULATION, AND SUPPORTS
The tank is encapsulated in high efficiency polyurethane foam insulation meeting the requirements for UL 94
HF-1 rating. The protective shell is constructed of type 304 brushed stainless steel. NSF approved adjustable
plastic legs are provided for support.