A. The
electric water heater shall be a 120 gallon capacity
vertical carbon steel tank lined with 1/2" thick
Hydrastone cement to ensure maximum operating life at elevated
temperatures. Heater shall not require any
type of anodic protection.
B. Tank inlet and outlet water connections
shall be a minimum of 1 1/4" NPT non-ferrous copper-silicon/brass.
Steel tank tappings will not be acceptable.
C. Tank shall be covered by a minimum 3" thick
polyurethane foam insulation to minimize stand-by heat loss
over
the life of the system. Due to the increased cost of operation,
systems with less than 3" insulation will not be
acceptable.
D. Outer protective jacket shall be a dent resistant composite
jacket to resist rust and corrosion.
E. Delivery water temperature control shall
be provided by an integrally piped and packaged thermostatic
mixing
valve. Valve shall be specifically designed, tested and manufacture-designated
for use in emergency safety
drench applications. Delivery water set point shall be 85°F.
(Optional temperatures available.)
F. Temperature safety system shall consist of a diaphragm
operated valve actuator to ensure a continuous
delivery flow of tepid water. The valve shall monitor pressure
on both cold and hot water inlets. On loss of cold
water pressure the valve shall prevent delivery of hot water
to avoid scalding. On loss of hot water pressure,
the valve shall allow the full ANSI required flow of cold
water to the emergency safety fixture.
G. Water pressure drop across the system
must not exceed 5psi at 20 GPM flow, mixing valve must have
a Cv
rating not less than 10.0.
H. The system shall be supplied complete
with all electrical operating controls. Safety devices and
accessories
shall include but not be limited to:
- Low watt density immersion heating element
- Adjustable immersion temperature controller
- Safety high
limit switch with manual reset
- Dial temperature and pressure
gauge
- ASME temperature and pressure relief valve
- Automatic air
vent valve
In addition, this packaged system
shall be supplied with the following optional features:
- Option________________________________
- Option________________________________
- Option________________________________
The water heater manufacturer
shall warranty all electrical components against defects
in workmanship and
materialfor a period of one (1) year from date of
start-up, and the pressure vessel for a full five
(5) years Non
Pro-
Rated (Optional Specification: full
ten (10) years Non Pro-Rated) from date of start-up, provided
that the unit
is started within three (3) months of date of shipment
and installed and operated within the scope of
the tank
design and operating capability. Each water heater
shall be shipped with a complete set of installation
and
operating instructions including spare parts list and
approved drawings.
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