Download - Armstrong Fluid Technology

1. General
1.1
Introduction
The Armstrong ECO*PAK MBS™ is a fully-integrated, high-efficiency, modular heating system with a compact design
that makes it an ideal solution for new constructions, retrofit commercial installations and larger residential
applications. Available in standard model sizes ranging from 420 to 1,140 MBH, this packaged boiler system is preengineered for optimal performance under varying load conditions and therefore it is significantly more efficient than
conventional field-assembled boiler systems. The innovative, modular configuration results in a small package that
can be easily moved through the doors, positioned in place and installed in a matter of hours.
The ECO*PAK MBS includes as standard the following components: intelligent variable speed hot water pumps,
condensing boilers, integrated controller with temperature sensors & serial communication to BAS, expansion tank, air
separator, isolating valves, strainer, chemical pot feeder, water make-up system, interconnecting piping with air vents,
drain cocks and test points, electrical wiring and thermal insulation. As an option, the ECO*PAK MBS can be supplied
with a gas meter and hot water flow sensor.
Armstrong intelligent twin-head pump for duty/standby operation incorporates Armstrong’s motor-mounted variable
frequency drives (VFD’s) which will constantly adapt to changes in the distribution system characteristics. The pump
features economical inside-type, single-spring mechanical seal, serviced by removing the rotating assembly while the
pump casing remains in the line. Dynamically balanced impeller assures smooth, vibration-free operation. Radially
split volute has equal suction and discharge flange sizes. Separate tapped openings are provided for gauge, flush and
drain connections. The pump controls and boiler combustion controls are integrated to ensure that the minimum flow
rates are maintained and that the boilers are running in the condensing mode as long as possible.
Low NOx gas fired condensing boilers with stainless steel heat exchangers and modulating premix gas burners are at
the heart of the ECO*PAK MBS System. Through the sophisticated ECO*PAK MBS integrated controller, the boilers
are capable of operating at overall seasonal efficiencies of over 94% with low carbon emissions. The boilers bear
ASME and National Board stamps and are certified for use on Natural Gas and LPG. The boilers comply also with
the energy efficiency requirements of the latest edition of the ASHRAE 90.1 Standard and the minimum efficiency
requirements of the latest edition of the ASHRAE 103 Standard. The boilers meet as a minimum U.S. Environmental
Protection Agency and Department of Energy guidelines for “Energy Star” efficiency. On site, a concentric balanced
flue system discharges products of combustion through the inner annulus and draws combustion air through the outer
annulus, allowing room sealed applications.
The integrated controller provides the following functions:
1. Ensure minimum hot water flow rates are maintained to operate in the high efficient condensing mode at
all times within a variable primary flow configuration
2. Optimize boiler firing rate to match exact heating loads
3. Optimize boiler sequencing to achieve the highest efficiency possible from the system
The integrated controller has a NEMA 12 enclosure and houses PLC’s, circuit breaker, terminal strip and main
disconnect switch. The controller incorporates a door mounted 5.7" touch-screen Human Machine Interface (HMI) for
all necessary user set up and troubleshooting operations. The integrated controller is pre-programmed with project
specific data for easy start-up and commissioning. On start-up, a read only screen displays Outdoor Air (OA)
temperature, HWS temperature, HWR temperature, system hot water ¨T, system heat output in MBH (optional), and
pump kW usage. The initial screen displays also boilers status, pump status, system status, system run time and
individual pump hours run time. Alarms, data trending of system parameters are also displayed on the touch-screen
HMI and logged in the memory of the HIM available for upload when required.
A second screen (password protected for access to field adjustable parameters) provides access to input time, night
setback, holiday settings, virtual hand/off/auto (HOA) and time extension buttons. Subsequent screens are also
password protected and provide access to mode/system set-up, PID set-up, frost protection, clock set-up and reset
and restore default screen.
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