GENERAL
Provide a quantity of ________ Transflow 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 requires only plumbing and electrical service connections. The tank shall be all welded steel commercial construction designed for 150psi working
pressure and contain _____ gallons of storage. The tank shall be lined with seamless Hydrastone cement to a minimum thickness of 1/2" on 100% of all interior tank surfaces and does not require any type of anodic
protection. The tank shall be designed and 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 unit shall bear the UL listing mark certifying the entire water heater.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 hot 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. HEATING COIL
The tank shall be fitted with a heating coil which transfers heat from the boiler water to the domestic water. Boiler water shall be in
the tubes, and domestic water in the tank. The heating coil shall be of single wall (rOptional Specification: double wall )
copper construction for maximum heat transfer efficiency and coil longevity. The coil shall have ___ (Specify 15, 20, 40) square feet of heating surface and shall be fully removable from the tank to allow for periodic inspection and maintenance without the need to move or lift the storage tank from its installed position. The heating coil shall have 3/4" Male NPT threaded connections.
THERMOSTAT
The tank shall be fitted with an immersion 110-170oF adjustable temperature controller to control the flow of boiler water through the heating coil. The S.P.S.T. 120 volt, 1
phase thermostat opens or closes the control circuit to the circulation pump or zone valve (by others) in order to regulate the flow of boiler water through the coil and thereby maintain the desired water temperature in the tank.
WARRANTY
The water heater manufacturer shall warranty all components against defects in workmanship and material for a period of one (1) year from date of start-up, and the pressure vessel
including the heating coil for a full seven (7) 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. |
