15. All controllers, including those assigned to data processing, shall be same model and series. 16. Controllers shall be the current generation product that will be supported by the manufacturer, with parts and service, for a minimum of ten years from time of installation. 17. All controllers shall be mounted within specified control panels. 18. Examples of acceptable controllers: Hays-Cleveland “AC Station”, MicroMod “Mod 30 ML”, Moore 323, Preferred “PCC III”, Toshiba “LC500”. C. Supplies: Provide separate uninterrupted power supply for each boiler controller. Any signal that is common to all boilers, such as plant master control signals, shall be isolated from all other boilers so that failure in one boiler circuit will not affect other boilers. SPEC WRITER NOTE: Include the following paragraph if touch screen operator interface is required. D. Touch Screen Operator Terminals: 1. Provide one touch screen control station and display for each boiler mounted on the boiler control panel. Touch screen shall be in complete communication with all controllers associated with the boiler and with the burner management system. Provide alternate control station to replace touch screen control functions if touch screen fails. 2. Control Station and Display Requirements: a. Local operation and programming of controllers, graphic display of information, alarm message display, historical and real time trending, remote controller tuning, x/y plots of fuel air curve data for intuitive commissioning of controllers, Ethernet connectivity and standard Internet browser remote communication. Network to boiler control and burner management systems. b. Selection of automatic or manual control of firing rate. Local manual control to increase and decrease the firing rate. c. Indicate burner management control status and diagnostics in English messages: control on, for ignition, igniter flame signal, main flame signal, post purge, burner off, all diagnostic information available from burner management system, continuous indication of flame signal.
this manual must be submitted to VACO CFM Consulting Support Services and VHA OCAMS for review and approvals. 3. Forced Fan Motor Operation Interlock: Provide current relays on each phase of power circuits to fan motor. For variable speed drives, provide signals to control system from VFD fault and run contacts and signals from VFD shaft speed feedback to prove proper fan speed for purging, low fire ignition, and for each burner load point. Any disconnects or other power shut-off devices between the location of the interlock devices and the motor shall also shut down the power supply to the burner management control system. 4. Atomizing Air Compressor (when provided) Motor Energized Interlock: Provide current relays on each phase of power circuits to the motor. In the power supply to the motor there shall be no disconnects or other power shut-off devices between the location of the interlock devices and the motor. 5. Forced Draft Fan Damper, Boiler Or Economizer Flue Gas Outlet Damper (if provided) Pre-Purge Position Interlock: Prove dampers wide open for pre-purge. Actuate sealed snap-action switches by levers attached directly to dampers or to damper linkages, which are pinned to prevent slippage. Parallel positioning systems may have the interlock switches in the drive units. 6. Flue Gas Recirculation (FGR) Dampers (if provided) Position Interlock: Prove dampers positioned as required by burner manufacturer for pre-purge and firing. Actuate sealed snap-action switches by levers attached directly to dampers or to damper linkages, which are pinned to prevent slippage. 7. Pre-Purge Airflow Interlock: a. Sense differential pressure between two points in combustion air system where the differential pressure at high fire is significant, such as several inches water column. There must be no intervening dampers. This is typically between the windbox and boiler outlet. b. Diaphragm-actuated snap-action switch designed for maximum system pressure, adjustable set graduated set point indicating scales. c. UL listed, FM approved. d. Provide air pressure sensing connections for test manometer so that air flow switch settings can be verified.