Hubbell Electric Heater Company EMV - Manual (Page 5)

SECTION I -
GENERAL DESCRIPTION AND CONSTRUCTION
GENERAL DESCRIPTION
This manual describes a packaged electric water heater system designed to meet the requirements of ANSI
Z358.1-1998 for tepid water delivery to an emergency drench system. The complete assembly consists of the
storage tank, immersion electric heating element(s), thermostat(s), safety relief valve, safety high temperature cut
out, mixing valve, 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, wired, tested, and ready for electrical and plumbing service connections.
CONSTRUCTION
TANK
The standard storage tank is constructed of steel and internally lined with specially formulated Hydrastone cement
to a ½-inch minimum thickness. The tank is designed for a maximum allowable working pressure of 150 psi (300
psi TP).
TANK CONNECTIONS
The heater is supplied with separate cold water and tepid water connections. A 1-½ inch FNPT connection is
supplied for the cold water inlet. The cold water is deflected by means of a baffle within the tank. A 1-¼ inch
FNPT union connection is supplied at the mixing valve for tepid water. 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. A ¾ inch GHT connection is supplied for draining.
See drawing for locations.
HEATING ELEMENT
The water heater is 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 is supplied with an immersion thermostat factory preset at 170°. The immersion
thermostat can be adjusted through a range of 100° - 180° F and is adjustable with a flat tip
screwdriver.
TEMPERATURE HIGH LIMIT SWITCH
As a safety device, a surface mounted high temperature cut-off switch with manual reset is
supplied. As an option, an immersion high temperature cut-off switch with manual reset may be provided. Either
high temperature cut-out switch is factory preset at 190°F. In the
event of an over-temperature condition, the thermostat will
disengage the power from the system. The high limit must be
manually reset
thereafter to restart the heater.
Manual Reset Surface Mounted High Immersion High
Temp. Cut-Off Switch Temp. Cut-Off Switch
(Standard) (Optional)
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