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GENERAL
Provide a quantity of _______ packaged type instantaneous electric circulation heater(s) Model No.________
as manufactured by HUBBELL Electric Heater Co., Stratford, CT. The pressure vessel section, including the electrical control panel, shall be mounted on structural supports and be suitably insulated, jacketed, painted, and provided
with proper lifting lugs. The entire unit is to be packaged ready for plumbing and electrical service connections and shall bear the UL listing mark certifying the entire unit. PRESSURE VESSEL
The pressure vessel shall be all welded carbon steel and hot dip galvanized after fabrication (rOptional
Specifications: Carbon steel, Type 304 or 316L Stainless Steel, 90/10 Copper-nickel, Copper-silicon, Titanium )
and rated for a maximum allowable working pressure of 150psi. Units rated over 58KW shall be ASME Code Section IV stamped and approved. The pressure vessel is to be completely covered with 2" thick "E" type energy conservation fiberglass blanket insulation and enclosed in a heavy gauge galvanized steel metal jacket finished in gray hammertone enamel. The vessel shall be protected by a factory installed ASME rated combination temperature and pressure relief valve set at 150psi and 210
oF. RECOVERY
The recovery section shall be rated at ________KW which will heat _________ GPM of water at_________ oF rise (_______ o to_________ oF ).
ELECTRICAL
The heater shall be designed to operate at volts, phase, Hz, with a fused low voltage transformer providing 120
volt to all operating controls. The immersion heating element shall be high quality copper sheathed (rOptional Specifications:
Incoloy, Type 304 or 316 Stainless Steel, steel, Incoloy, Monel, Inconel, Teflon, Titanium )
and sized to obtain the rated recovery. Each element circuit is to be independently operated through a definite purpose magnetic contactor having a resistive load rating equal to or exceeding the ampere rating of that particular circuit and shall be protected by individual fuses rated at approximately 125% of the ampacity of the circuit. Multiple circuit elements shall be provided with a master terminal block for connecting of the incoming power feeds
(rOptional Specification: Built-in non-fused On/Off disconnect switch, Built-in circuit breaker with On/Off handle ).
A safety door interlock switch shall interrupt power to the control circuit when the control panel door is opened. The operating thermostat shall be immersion type and shall be consistent with the recovery rate of the heating element as to the number of steps required. A Hi-Limit control with a manual reset button shall be factory installed to disconnect all ungrounded conductors to the heating element in the event of an over-temperature condition. A paddle-type flow switch and electronic low water cut off shall be factory installed to disengage the control circuitry when there is insufficient flow through the heater.
In addition, the circulation heater shall be supplied with the following optional features:
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Option _______________________________
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Option _______________________________
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Option _______________________________
WARRANTY
The 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 five (5) 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
vessel design and operating capability. Each heater shall be shipped with a complete set of installation and operating instructions including spare parts list and approved drawings. |
