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GENERAL
Provide a quantity of __________ explosion proof electric water heater(s) Model No. __________ as manufactured by HUBBELL
Electric Heater Co., Stratford, CT. The entire unit is to be complete with all operating controls and require only plumbing and electrical service connections. The heater is designed specifically for installation in a hazardous
location. All operating controls are to be housed within an electrical control panel rated for operation in a Class 1, Division 1&2, Groups B,C,D; Class 2, Division 1&2, Groups E,F,G; Class 3, Division 1&2; Nema
4, 7BCD,9; hazardous area and is UL and CSA listed. The tank shall be all welded steel commercial construction designed for 150psi working pressure and contain gallons of storage. The pressure vessel is to be lined with
seamless Hydrastone cement to a minimum thickness of 1/2" on 100% of all interior tank surfaces (rOptional Specification:
tank to be fabricated from solid copper-silicon, stainless steel )
and does not require any type of anodic protection. The tank shall be fabricated with non-ferrous copper-silicon threaded tappings and non-ferrous inlet and outlet piping for maximum corrosion resistance. Steel tank tappings will not be acceptable. The entire tank is to be insulated with a minimum of 2" thick polyurethane foam insulation and exceed the latest ASHRAE standard for stand-by heat loss. The complete heater shall be supplied with a high impact colorized composite protective jacket which cannot rust or corrode and does not require painting.
The cold water inlet shall be 3/4" Female NPT ( rOptional Specification: 11/2"
Male NPT )
and include a non-corrosive strata-flow diffuser which prevents incoming cold water from mixing too rapidly with hot water in the tank. A 3/4" hose connection drain is supplied. The hot water outlet shall be 3/4" Male NPT
(rOptional Specification: 11/2" Male NPT )
and shall include a factory installed built-in heat trap to prevent water from radiating through the piping during stand-by periods. A separate 3/4" Female NPT tapping is to be provided for relief valve installation. An ASME rated automatic reseating combination temperature and pressure safety relief valve set at 150psi and 210
oF shall be factory supplied. RECOVERY
The heating element(s) shall be high quality incoloy sheath electric immersion type, and shall be rated at _________KW which will
heat__________ GPH of water at _________ oF Rise (________ o to __________ oF). ELECTRICAL
The heater shall be designed to
operate at ______ volts ________ phase _______ Hz (balanced) with all necessary operating controls factory mounted, wired and tested. Heaters operating at 3 phase power shall have each circuit
independently operated through a definite purpose magnetic contactor having a resistive load rating exceeding the ampere rating of that particular circuit. Water temperature shall be controlled through an adjustable 110-170o
F snap action surface thermostat (rOptional Specification: an immersion thermostat 100-180oF or 30-110oF
). An over-temperature manual reset Hi-Limit shall be factory installed to disconnect all conductors to the heating element in the event of an over-temperature condition in the pressure vessel.
In addition, the water heater shall be supplied with the following optional features:
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Option ______________________________
- r
Option ______________________________
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Option ______________________________
The water heater manufacturer shall warranty all electrical components against defects in workmanship and material for a period of one (1) year from date of start-up, and the pressure vessel for a full three (3) 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. |
