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SECTION I - GENERAL DESCRIPTION AND CONSTRUCTION
GENERAL DESCRIPTION
This m
anual 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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