Transcript
Typical Specification IFW-SPEC-03 Typical Specification for Lochinvar® Intelli-Fin® Water Heater Models 1,500,000 - 2,000,000 Btu/Hr The WATER HEATER shall be a LOCHINVAR INTELLI-FIN Model IW(N,L)_________PM having an input rating of _________ BTU/HR, a recovery capacity of __________ gallons per hour at a 100o rise and shall be operated on (Natural Gas) (L.P. Gas). The water containing section shall consist of two integrated heat exchangers constructed of "Fin Tube" design, with straight copper tubes having extruded integral fins spaced seven (7) fins per inch. These tubes shall be "rolled" securely into glass-lined, cast iron headers. There shall be no bolts, gaskets or "O" rings in the head configuration. Removable access plugs shall be provided on the heat exchanger headers for the purposes of inspection, cleaning or repair. WATER HEATER drains shall be provided, having external access. The heat exchanger shall be mounted in a stress free jacket assembly in order to provide a "free floating design" able to withstand the effects of thermal shock. The WATER HEATER shall bear the ASME "HLW" stamp for 160 PSI working pressure and shall be National Board listed. The complete heat exchanger assembly shall carry a five (5) year warranty against failure caused by defective workmanship or material. The WATER HEATER shall be designed to accept return water temperatures of [70°F (2,000,000 Btu input model)] [90°F (1,700,000 Btu input model)] [105°F (1,500,000 Btu input model)] without auxiliary piping or preheat loops. WATER HEATERS shall be supplied with a integral circulating pump wired for intermittent operation, with sufficient capacity to insure scale-free heater performance. The pump shall be all bronze and provided for operation on 120 volt, 60 cycle, 1 phase power supply (unless otherwise specified). The combustion chamber shall be constructed of stainless steel and fully sealed. The combustion process shall employ the Lochinvar fully condensing power burner concept. The burner surface shall be constructed of high temperature aluminum/chromium alloy woven mesh and fire in a vertical plane within the combustion chamber. The burner shall utilize a special perforated flame injection tube extending the entire length of the heat exchanger. A complete five-year warranty from the WATER HEATER manufacturer must be provided. The burner shall be capable of firing from a blue flame with maximum gas and air input down to full infrared when input is proportionately reduced based on system load. Burner must be capable of firing at 100% of rated output when supplied with 4 inches water column of gas supply pressure to the WATER HEATER. This will ensure availability of full rate firing under heavy demand conditions, no exceptions. The burner shall fire in a full 360-degree pattern providing uniform heat transfer on the entire copper heat transfer surface. A viewing port shall be provided, permitting visual observation of burner flame. The WATER HEATER shall use a combustion air blower to precisely control the fuel/air mixture for maximum efficiency. The blower housing shall be a fully sealed, non-sparking, cast aluminum assembly. The blower assembly shall be mounted on the burner and draw gas and air from a premixing chamber. A variable frequency drive shall be used to infinitely vary blower speed and volume of air delivered to the combustion process. The combustion air blower shall operate for a pre-purge period before burner ignition and a post-purge period after burner operation to clear the combustion chamber. A differential air pressure switch shall be provided to prove operation of the combustion air blower, monitor combustion chamber pressures and monitor operation of the flue. The WATER HEATER shall be constructed with a 16 gauge galvanized steel outer jacket assembly. The interior of the combustion chamber and flue collector shall be constructed of stainless steel so as to ensure corrosion protection on all inner surfaces. All inner and outer jacket panels shall be fully gasketed and sealed. The exterior of the jacket assembly shall be primed and pre-painted on both sides with a minimum dry film thickness of 0.70 mils. All models shall be certified for installation on combustible floors without additional safety provisions. The WATER HEATER shall be designed to allow field installation of multiple venting options. The WATER HEATER shall be vented (with a vertical positive draft, Category IV vent system drawing combustion air from the equipment room) (with a horizontal positive draft, Category IV vent system drawing combustion air from the equipment room. The sidewall vent cap shall be supplied by Lochinvar) (with a horizontal Direct Vent system using a two pipe system installed with Category IV vent pipe and a separate air inlet pipe both terminating on the sidewall. The sidewall vent and air inlet caps shall be supplied by Lochinvar) (with a vertical Direct Vent system using a two pipe system installed with Category IV vent pipe and a separate air inlet pipe. The rooftop vent and air inlet caps supplied by installing contractor) (with a horizontal Intelli-Vent system using a two pipe system installed with Category IV vent pipe where flue products are vented to a sidewall with a positive draft and combustion air is drawn from the roof. The sidewall vent cap shall by supplied by Lochinvar)(with a vertical Intelli-vent system using a two pipe system installed with Category IV vent pipe where flue products are vented to the roof top and combustion air is drawn from the sidewall. The sidewall air inlet cap shall be provided by Lochinvar.) A Direct Vent System shall terminate both the flue outlet and the combustion air inlet in the same pressure zone on the building exterior surface. An Intelli-Vent system shall terminate both the flue outlet and the combustion air inlet in the different pressure zones on the building exterior. A 24 VAC control circuit and components shall be used in conjunction with a 24-volt circuit breaker. All components shall be easily accessed and serviceable from the front and top of the unit. Standard operating controls shall utilize immersion thermisters to sense water temperatures for the digital interface controller. An adjustable immersion type, manual reset safety high limit shall be provided to limit water temperature. The control panel shall contain a lighted on/off main power switch, alarm light and audible silence switch, and a high temperature alarm light.
The WATER HEATER shall be equipped with an interface controller with a microprocessor based platform incorporating unique software customized for operation of the Lochinvar Intelli-Fin. The controller shall be compatible with LonWorks® building management systems. All internal safety, operating and ignition controls shall interface with the microprocessor controller. The WATER HEATER interface control shall provide on/off control of the gas supply to the burner, operation of the VFD to control the variable speed combustion air blower, interface with the ignition control system, on/off control of the integral circulating pump, operation of the floating point bypass valve, control of water temperature set points, and monitoring of all safety functions. Local communication, programming and display of operating and alarm status conditions shall be accessible through a digital display panel. The digital panel shall display 21 data points on each unit an be capable of monitoring up to 16 individual units. Displayed data points include temperature, unit operation status, operational sensor location, total run time, (sequencing operation – optional), and firing rate. The digital display panel may be optionally remote mounted and communicate with the WATER HEATER(S) via a twisted pair cable connection. The WATER HEATER interface control shall serve as an operating temperature control to track demand and regulate the amount of heat added to the system to meet hot water demand. The WATER HEATER interface control shall be capable of varying burner input from 25 percent up to 100 percent of rated input. Burner input may vary in steps as small as 1 percent of input allowing up to 75 adjustable steps while tracking the hot water demand. Access to the WATER HEATER interface controller shall be made by a wiring harness with unique multiple pin terminations for each connection point. Access to the WATER HEATER interface controller to adjust settings shall be limited by a changeable password system entered through the digital display panel. The standard ignition control system shall include an electronically proven Hot Surface Ignition system with full flame monitoring capability. Additional standard controls shall include a low voltage transformer for the control circuit, a flow switch to prove water flow, temperature-pressure gauge and a factory installed ASME relief valve. All internal and external wiring harness connections shall have multi-pin plug in type connectors to ease service, troubleshooting and reduce removal and replacement cost. The manufacturer shall verify proper operation of the burners, all controls and the heat exchanger by connection to gas, water and venting for a full factory fire test prior to shipping. A quality test report shall be shipped with each unit. The WATER HEATER shall be certified and listed by CSA International under the latest edition of the harmonized ANSI Z21.13 test standard for the US and Canada. The WATER HEATER shall comply with the energy efficiency requirements of the latest edition of the ASHRAE 90.1 Standard. The WATER HEATER shall operate at up to 97% thermal efficiency. The WATER HEATER shall be capable of two-way communication on a LonWorks building management network. An external terminal strip for easy communication wiring. (Remote diagnostic and operation information utilizing a personal computer shall be provided via the LonWorks network connection. Temperatures, unit operation status, operational sensor location, total run time, sequencing operation, and firing rate shall be visible using the remote connection, adjustment of changeable points is required. Monitoring only is unacceptable.) (Remote diagnostic and operation information utilizing a personal computer shall be provided via phone line, modem and translation hardware package, provided by Lochinvar. Temperatures, unit operation status, operational sensor location, total run time, sequencing operation, and firing rate shall be visible using the remote connection, adjustment of changeable points is required. Monitoring only is unacceptable.) The multiple WATER HEATER plant shall be sequenced using a (First on Last Off arrangement) (First on First Off arrangement with lead-lag) (run-time equalization arrangement) (efficiency optimization arrangement). A twisted pair cable connection between each WATER HEATER and the sequencer in a “daisy chain” arrangement will provide all necessary wiring (wiring performed by others). First on Last off will energize WATER HEATER #1 upon a call for heat, additional WATER HEATERS will be energized in numbered order to meet the heat demand. Once demand is satisfied the WATER HEATERS will be shutdown in reverse order with #1 being the last to shut down. First on First off will energize WATER HEATER #1 upon a call for heat, additional WATER HEATERS will be energized in numbered order to meet the heat demand. Once demand is satisfied the WATER HEATERS will be shutdown in the same order in which they were started with #1 being shutdown first. This operation will include lead-lag. Lead-lag will rotate the lead WATER HEATER among all available WATER HEATERS in an effort to equalize run-time. Run Time equalization will direct WATER HEATER sequencing without regard to numbered sequence and focus only on run-time hours. Upon a call for heat the sequencer will look at the total run-time for each unit and identify and select the unit with the least total hours to be the lead WATER HEATER. Additional WATER HEATERS will be energized utilizing an identical selection process. Efficiency Optimization with Run Time Equalization will energize WATER HEATERS and control firing rate to maximize the efficiency of the entire modular WATER HEATER installation. The sequencing control will first determine hot water demand. Then it will calculate the optimum available firing rate based on the number of water heaters available for operation. Finally the control will energize the selected number of WATER HEATERS and fix their firing rate to match system demand while maximizing efficiency. Maximum unit dimensions shall be: Length ________inches, Width ________inches and Height __________ inches. Maximum unit weight shall be_________pounds. The hot water WATER HEATER shall have an independent laboratory rating for Oxides of Nitrogen (NOx) of less than 20 ppm corrected to 3% O 2. The Firing Control System shall be ______ (Options Below). M9 – Electronic Control with Proportional Fire Hot-Surface Ignition (Standard) M13 – GE GAP/FM/IRI M7 – California Code
02/07 – Printed in U.S.A.
