SECTION: 15550 CASV, Chimney Automation System by JYT808qI

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									SECTION: 23 51 13.13
MODULATING COMBUSTION AIR SYSTEM
(SFTA, VFD, EBC35)

PART 1: GENERAL
1.01    SUMMARY
  A. The intent of this specification is to provide an energy and cost-efficient modulating
     combustion air supply system that will function over variable flow and maintain
     specified pressure at all times. The following are components of the system:
        1. ENERVEX MCAS, Modulating Combustion Air System, ETL listed to UL
           1995, Standard for Heating and Cooling Equipment.
        2. Electrical connections.
        3. Duct connections.
1.02    RELATED REQUIREMENTS
  A. Section 01 41 00, REGULATORY REQUIREMENTS
1.03    CODES AND STANDARDS
  A. The following published specification standards, test or recommended methods of
     trade, industry or governmental organizations apply to work in the section:
        1. UL – Underwriters Laboratories.
        2. National Electrical Code.
1.04    SUBMITTALS
  A. System vendor shall coordinate equipment product data submittal sheets and shall
     provide a comprehensive set of interfaced drawings and duct design calculations,
     which shall serve as the basis for system evaluation by consulting engineer.
  B. Submit the following to the Owner’s Representative.
        1. Ventilator descriptive literature, dimensional diagram and electrical diagram.
        2. Control descriptive literature, dimensional diagrams and electrical diagrams.
        3. Specification review with respect to submitted equipment identifying all areas
           of compliance and exceptions.
        4. Certification of listing for the actual application by recognized testing
           laboratory.
  C. Manufacturers not named in these specifications, but those that have received
     prior approval by the consulting engineer as required within 10 days prior to bid
     date, shall be permitted one opportunity to receive formal submittal approval. If the
     consulting engineer does not grant this approval, the contractor shall submit on the
     manufacturer’s name in these specifications only or the contractor will be charged
     for the submittal review time for alternate manufacturers.
       In the event the Contractor wishes to submit an alternate modulating combustion
       air system manufacturer for consideration by the Engineer/Owner, the Contractor
       shall submit to the Engineer/Owner, a minimum of 14 days prior to bid date, a
       complete technical proposal based on the alternate system, including equipment



3917022 MCAS, SFTA, VFD, EBC35
       brochures, detailed technical data sheets, detailed drawings, detailed wiring
       diagrams, detailed operational description, comprehensive set of modulating
       combustion air calculations, evidence of manufacturing capability and evidence of
       third-party listing. If any of the above materials specified for the product substitution
       proposal are not included in the product substitution proposal, those proposals
       shall be considered non-responsive and incomplete and shall be rejected by the
       Engineer/Owner.
1.05    QUALITY ASSURANCE
  A. All equipment and accessories to be the product of a manufacturer regularly
     engaged in its manufacture and shall be of a standard catalog product.
  B. Modulating combustion air system guaranteed to operate satisfactory and
     efficiently and to provide a constant pressure that does not fluctuate more than +/-
     0.01” W.C. under stable load conditions.
  C. Scheduled equipment performance is minimum capacity required.
  D. Scheduled electrical capacity shall be considered as maximum available.
  E. Equipment to be manufactured at ISO 9001 certified plant.
1.06    MANUFACTURER WARRANTY
  A. All equipment is to be guaranteed against defects in materials and/or workmanship
     for a period of 24 months from the date of delivery to the construction site. The
     warranty shall be provided by the equipment vendor and shall include the parts
     necessary to repair or replace all defective parts and materials.
1.07    OPERATING AND MAINTENANCE MANUALS
  A. Provide to Owner’s Representative complete Operation and Maintenance manuals
     with product literature on the ventilator and controls, dimensional and wiring
     diagrams.

PART 2: PRODUCTS
2.01     MANUFACTURER, MODULATING COMBUSTION AIR SYSTEM
  A. Furnish ENERVEX Modulating Combustion Air System with design volume and
     design pressure as scheduled on the drawings and specified. The entire system
     must conform to UL 1995, Standard for Heating and Cooling Equipment and bear a
     certification mark from ETL or other nationally recognized testing laboratory.
2.02    DESCRIPTION, MODULATING COMBUSTION AIR SYSTEM
  A. The ventilator must be suitable for indoor installation. The housing shall have duct
     connections and be designed so the entire propeller and motor assembly are
     enclosed. Housing shall be continuously welded, heavy gauge corrosion resistant
     steel. The housing shall be coated with corrosion resistant enamel.
  B. The eight-blade propeller shall be made of aluminum and be completely in balance
     for quiet, vibration-free operation.
  C. The motor must be a maintenance-free, variable speed motor with pre-lubricated
     and sealed ball bearings. The motor shall be factory warranted by the ventilator
     manufacturer to operate at frequencies as low as 8Hz for three-phase motors. The
     bearings must be of a high temperature type with a minimum rating of 320°F


3917022 MCAS, SFTA, VFD, EBC35
      (160°C). The motor shall be Class F insulated with a min. temperature rating of
      311oF (155oC) and rated as shown on schedule. The motor must be a totally
      enclosed, fan-cooled (TEFC) motor that does not need an exterior cooling fan. To
      assure motor longevity the motor shall be inverter-duty rated and not operate at
      speeds above 1750 RPM.
  D. The modulating fan control, EBC35, shall be a true PID-based control with infinitely
     variable speed settings and in a NEMA 1 rated enclosure. It has integrated CO
     monitoring device. It shall interfere with the operation of the heating appliances by
     preventing burner operation during emergencies where a mechanical or electrical
     problem occurs, or if the installation site’s CO concentration reaches dangerous
     levels.
      The features must be part of the compliance with UL378, Standard for Draft
      Equipment and UL508, Standard for Industrial Controls:
        1. “Plug-and-Play” self-check that detects connections, setting requirements and
           accessories during each start-up.
        2. Programmable microprocessor for selective programming of, but not limited
           to, draft, intermittent vs. continuous fan operation, purge times, sensor
           sensitivity, alarm limits and delays, manual overrides, low/high limit fan
           speeds via the operating panel.
        3. A standard board that interlocks with up to 6 boilers/appliances so a call for
           heat activates the supply fan and releases the individual burner once the pre-
           set draft has been established.
        4. An integrated and programmable proven draft function that can be set for
           automatic and manual reset.
        5. An integrated Operating Priority option, which allows one or more appliances
           to operate during electrical or mechanical failure of the fan, provided the draft
           requirement can be met and safe operation assured. Set up of a default
           Operating Priority must be possible, so the most important appliance(s) have
           highest priority during calls for heat. It must automatically check for fan
           operation every two hours and go back to normal operation if appropriate.
        6. Bearing cycle activation every 7 days if the supply fan has not been operating
           during the past 7 day period.
        7. A normally open (NO) contact is available within the control to activate a
           visual or audible alarm (by others), or to interlock with a Building
           Management System.
        8. An alarm function that will display the fault code on the LED display and
           signal an audible alarm (by others). The control shall log the last 10 fault
           codes.
        9. (Relay board for additional appliances in system. Board will fit inside control
           housing and interlock appliances with safety features of control)
        10. Adjustable pre-purge, so the control will allow the supply fan to prime the
            mechanical room prior to appliance startup.
        11. Adjustable post-purge, so the control will allow the supply fan to operate for
            up to 3 minutes after the burner has shut down.



3917022 MCAS, SFTA, VFD, EBC35
  E. The pressure sensor, XTP2, must be certified for use with oil- or gas-fired
     appliances and shall include a chimney probe along with tubing for installation in
     the chimney or stack as shown on the manufacturer’s submittal and feature:
        1. The temperature drift shall be less than +/- 0.3% full scale, the offset longtime
           drift (1 year) shall not exceed +/- 0.0015 inWC (0.35Pa) and the sensor
           response time shall be less than 0.25 seconds.
  F. The CO transmitter shall be certified for continuous monitoring and for use with oil-
     or gas-fired appliances as shown on the manufacturer’s submittal and feature:
        1. Wide spectrum, long life electromechanical sensor with a sensor life span of
           min. 2 years under normal conditions.
        2. A display showing actual CO concentration.
        3. Operating range of 0-125 ppm with a recommended default setting of max.
           50 ppm on a Time Weighted Average over an 8 hour period. Response time
           shall be less than 60 seconds for a 90% step change.
  G. Variable frequency drive, ABB Model ACH 550 listed to UL508 and listed and
     programmed as part of the mechanical draft system. The VFD shall not be part of
     the PID-loop.
        1. All features shall be included within the VFD enclosure. VFD shall be housed
           in a NEMA 1 enclosure.
        2. The VFD shall convert incoming fixed frequency three-phase AC power into a
           variable frequency and voltage for controlling the speed of three-phase AC
           motors. Motor voltage shall be varied with frequency to maintain desired
           motor magnetization current suitable for fan control and to eliminate the need
           for motor de-rating.
        3. With the motor’s rated voltage applied to the VFD input, the VFD shall allow
           the motor to produce full rated power at rated amps, RMS fundamental volts,
           and speed without using the motor's service factor.
        4. VFD shall include a “signal loss detection” circuit to sense the loss of an
           analog input signal such as 4 to 20 mA or 2 to 10 V DC, and shall be
           programmable to react as desired in such an instance.
        5. VFD shall be able to communicate via embedded Fieldbus supporting
           Modbus RTU (EIA-485), Johnson Controls N2, Siemens Building Technology
           FLN (P1), and BACnet (MS/TP).

2.03    PERFORMANCE, MODULATING COMBUSTION AIR SYSTEM
  A. The Modulating Combustion Air System will ensure that the pressure set-point (in.
     W.C.) is reached and maintained within 30 seconds of burner light-off.
  B. Ramp-up and ramp-down time of the fan will be no more than 20 seconds.
  C. The Modulating Combustion Air System will maintain the pressure to within +/-
     0.01” W.C. of the pressure set-point (in. W.C.) in the supply air system.
  D. The control will shut down the appliance(s) within 120 seconds or less if pressure
     is not maintained as stated above.




3917022 MCAS, SFTA, VFD, EBC35
2.04     SEQUENCE OF OPERATION
  A. The appliance(s) must be interlocked with the control. Upon a call for heat, the
     control will activate the ventilator to establish the required pressure in the
     combustion air system. Once the pressure is established at the set-point, the
     control will enable the appliance(s) calling for heat to fire. This sequence is
     repeated every time an appliance calls for heat without the control interrupting the
     sequencing of the heating appliances.

  B. When an appliance shuts down, the ventilator will adjust its speed to maintain the
     pressure at the set-point. Once the last appliance has shut down, the ventilator will
     continue to run in post-purge mode for the set amount of time.

  C. If proper pressure cannot be maintained because of a mechanical or electrical
     failure, the control will go into alarm mode and the integrated proven draft function
     will shut down all appliances within 120 seconds or less. While in alarm mode, the
     control constantly monitors the pressure. If the failure corrects itself or is corrected
     via intervention, the system will restart automatically.

       If the failure is not corrected, the control will utilize the integrated Operating Priority
       function. During a following call for heat, the control determines if one or more
       appliances can be operated safely at the present pressure conditions. If so, the
       heating appliance(s) will be able to operate without ventilator operation. After two
       (2) hours, the control verifies ventilator operation and, if present, the control will go
       back to normal operation. Otherwise, the control will continue to operate in
       Operating Priority mode. The self-check is repeated every two (2) hours infinitely.
       During a period without ventilator operation, the control is in alarm mode to notify
       the Building Management System.

  D. If unsafe CO levels are present, the control will go into alarm mode and shut down
     all appliances within 15 seconds. While in alarm mode, the control constantly
     monitors the CO levels. If the failure corrects itself or is corrected via intervention,
     the system will restart automatically.

  E. If the ventilator is out of commission for seven (7) days, the Bearing Cycle
     Activation function will allow the ventilator to operate at a low speed for a short
     time. This is automatically repeated every seven (7) days the ventilator does not
     operate.

2.05     DUCT CONNECTION
  A. Furnish slip connection type as required.
2.06     RELAY BOARD FOR EBC35 CONTROL (For 7 boilers or more only)
  A. Furnish an internal relay to interlock multiple boilers with the EBC35’s safety
     functions.


2.07     ELECTRICAL REQUIREMENTS
  A. Power supply shall be:



3917022 MCAS, SFTA, VFD, EBC35
             1. To the EBC35 control: 1x120V AC, 60 Hz.
             2. To the variable frequency drive: As shown on schedule.
   B. All wiring shall be in accordance with the National Electrical Code.
 ALTERNATE MANUFACTURERS
        All product substitution proposals on the basis of alternative mechanical draft
        system manufacturers must include detailed information regarding product
        performance and include a listing report by a nationally recognized testing
        laboratory that verifies that the entire system is in compliance with UL 1995 and
        meets all the specifications listed. It is the Contractor’s responsibility to assure that
        a substituted system meets the complete detailed functions specified herein. If a
        substituted system does not provide all these functions, the Contractor will be fully
        liable for bringing the installed system into compliance or replacing it with the
        originally specified manufacturer’s system.
 SCHEDULE

                                                                  Electrical Data                   HP
  Unit Tag      Servicing   Manufacturer     Model No.                                   RPM
                                                           Amps       Volts     Phases             (kW)
                                                                                                    3.0
  Example        B-1, B-2     ENERVEX            MCAS24     8.2       230        3       1750
                                                                                                   (2.2)


 1. ____HP Variable Frequency Drive

 Footnote to Specifier: Fill in data

ENERVEX                                                                                                    Capacity   SP (in
              Ventilator    Voltage*       Amps     Voltage *     Amps        RPM        HP (kW)
Model No.                                                                                                  (SCFM)     W.C.)
                              200-                     440-                                                 3,200     0.25
MCAS16         SFTA 16                     2.8                     1.4        1750       1.0 (.75)
                            240/3/60                 480/3/60
                              200-                     440-                                                 4,600     0.25
MCAS18         SFTA 18                     2.8                     1.4        1750       1.0 (.75)
                            240/3/60                 480/3/60
                              200-                     440-                                                 6,500     0.25
MCAS21         SFTA 21                     4.0                     2.0        1750       1.5 (1.3)
                            240/3/60                 480/3/60
                              200-                     440-                                                10,500     0.25
MCAS24         SFTA 24                     8.2                     4.1        1750       3.0 (2.2)
                            240/3/60                 480/3/60
                              200-                     440-                                 5.0            17,500     0.25
MCAS30         SFTA 30                     14.2                    7.1        1750
                            240/3/60                 480/3/60                             (3.75)
                              200-                     440-                                10.0            31,000     0.25
MCAS36         SFTA 36                     23.0                   11.5        1750
                            240/3/60                 480/3/60                              (7.5)

 *Voltage to VFD, if required. Voltage from ventilator to VFD may be different.

 PART 3: EXECUTION
 3.01        INSTALLATION
   A. Complete structural, mechanical, and electrical connections in accordance with
      manufacturers’ printed instructions.
   B. Installing contractor shall install all Modulating Combustion Air System components
      as indicated on drawings, including low voltage shielded wiring from XTP2-sensor
      to EBC35 controller and line voltage wiring from EBC35 to the supply fan. He must
      ensure the following.



 3917022 MCAS, SFTA, VFD, EBC35
        1. Allow satisfactory arrangement in the space available.
        2. Verify fan operating voltage is the equivalent to the supply voltage AND rated
           voltage of the VFD.
  C. Connecting to duct:
        1. Install per plans and in accordance with manufacturer’s printed instruction.
3.02    OPERATING TESTS, START-UP, AND ON-SITE SERVICES
  A. System vendor’s service organization shall employ senior service technicians
     having experience in all aspects of trouble shooting, corrective service, and
     preventive maintenance O&M reporting.
  B. After installation is completed:
        1. Test the operation of the Modulating Combustion Air System and:
              a. Increase and decrease pressure setting to verify the modulating
                 combustion air system reacts as specified.
              b. Increase and decrease firing rate to verify the modulating combustion
                 air system reacts as specified.
              c. Verify that the ramp-up time during start up does not exceed 20
                 seconds. This is defined as the time from the burner is released until the
                 pressure settles at the specified pressure value.
              d. Use an external manometer (draft gauge) to verify that the pressure
                 does not drift more than +/- 0.01” W.C. during a stable load.
        2. Test safety control by firing the appliance and:
              a. Shut off the ventilator
              b. Shut off the control.
(IF FACTORY START-UP)
  A. Provide services of factory representative of Modulating Combustion Air System
     manufacturer to:
        1. Supervise installation of ventilator and controls.
        2. Test individual controls for proper operation.
        3. Set pressure for specified operation.
        4. Test safety system.
  B. Submit a written report signed by manufacturer’s authorized representative,
     confirming that safety and operating controls have been properly installed.
3.03    OPERATING INSTRUCTIONS
  A. Instruct Owner’s Representative and designated personnel in the proper operation
     and maintenance of the packaged system.




3917022 MCAS, SFTA, VFD, EBC35

								
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