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Boiler Replacement

REQUEST FOR QUOTATION

TO:

SUBMIT BID TO: Vice President of Finance & Operations
Pratt Community College
348 NE SR 61
Pratt, KS 67124-9700

Quotation Number 061019 (Refer to this number in any communication.)

Bids are requested on the item(s) listed below. FOB Pratt Community College.

QUANTITY
ITEM
UNIT
PRICE
TOTAL

Benson Education Center – Boiler Replacement
And Domestic Hot Water Heater Upgrade

General

The following summary describes the Mechanical and Electrical scope of work required for the replacement of two existing boilers and four existing hot water heaters. All equipment is located in the main mechanical room of the Benson Education Center and serves as the main heating equipment and domestic hot water heating units for the building. The air conditioning for this building is provided by a chilled water unit which is connected to the same 2-pipe system as the boilers. Because of this, the contractor is asked to minimize to the best of their ability, the down time of the chiller system.
Pratt Community College is unaware of any Asbestos in the materials which will be disturbed in the execution of this project. If Asbestos is suspected, contractor is to notify Pratt Community College. It will be the responsibility of Pratt Community College to identify and remediate any Asbestos that would be disturbed by this contract.

Mechanical Scope

Two existing boilers, along with two expansion tanks and one air separator will be removed and disposed of. Two new boilers, two circulation pumps, one air separator and one expansion tank will be re-installed. Existing piping to be removed and / or re-routed only to the extent needed for the re-installation of new equipment. New piping shall be minimum of schedule 40 carbon steel. New or re-routed piping, and air separator to receive new 1” fiberglass jacketed insulation system.

Four existing domestic hot water heaters along with one 400-gallon hot water storage tank will be removed and disposed of. Two new hot water tanks will be re-installed. Existing domestic water piping to be removed and / or re-routed only to the extent needed for the re-installation of the new equipment. New domestic water piping to be type L hard drawn copper. Existing domestic hot water circulation pump to remain. New or re-routed piping to receive new 1” fiberglass jacketed insulation system.

New boilers to be equipped with digital communication controllers, standard protocol BACnet, for integration into existing / future Building Management System (BMS).

Existing 24” round vent system to be demolished in the mechanical room and left in place thru chase. Existing vent cap to be removed and replaced with minimum 16ga galvanized plate and sealed to make weather tight. Two new 6” boiler vents as well as two new 3” hot water heater vents will run vertically thru the existing 24” round vent and terminate thru the new galvanized plate in a weather tight fashion. Boiler vents to be CAT IV 6” UL-1738 Stainless Steel. Hot water heater vents to be 3” PVC. All venting shall be in accordance with manufactures recommendations.

Existing gas line to be removed and / or re-routed only to the extent needed for the re-installation to the new equipment. Gas line to be sized and installed in accordance with manufacturer’s recommendations including regulators as needed.

Electrical Scope

Mechanical Contractor is responsible to provide a licensed electrician to disconnect existing power and control wiring from old equipment. New equipment to be wired according to manufacturer’s installation instructions including new circuit breakers and service wiring where necessary. Boilers will be factory started in stand-a-lone operation, and will not require control wiring to BAS.

Equipment Specifications – Boilers

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes gas-fired, condensing stainless steel firetube boilers for heating hot water.

B. Related Sections include the following:

1. Division 23 Section “Breechings, Chimneys, and Stacks” for connections to breechings, chimneys, and stacks.

2. Division 23 Section “Feedwater Equipment” for connections to condensate and feed water system.

3. Division 23 Sections for control wiring for automatic temperature control.

1.3 SUBMITTALS

A. Product Data: Include rated capacities; shipping, installed, and operating weights; furnished specialties; and accessories for each model indicated.

B. Shop Drawings: Detail equipment assemblies and indicate dimensions, required clearances, and method of field assembly, components, and location and size of each field connection.

1. Wiring Diagrams: Detail wiring for power, signal, and control systems and differentiate between manufacturers installed and field installed wiring.
2. Include complete near boiler piping and wiring diagrams including point of connection to the system.

C. Source Quality Control Tests and Inspection Reports: Indicate and interpret test results for compliance with performance requirements before shipping.

D. Field Test Reports: Indicate and interpret test results for compliance with performance requirements.

E. Maintenance Data: Include in the maintenance manuals specified in Division 1. Include parts list, maintenance guide, and wiring diagrams for each boiler.

1.4 QUALITY ASSURANCE

A. Listing and Labeling: Provide electrically operated components specified in this Section that are listed and labeled.

1. The Terms “Listed” and “Labeled”: As defined in NFPA 70, Article 100.

2. Listing and Labeling Agency Qualifications: A “Nationally Recognized Testing Laboratory” as defined in OSHA Regulation 1910.7.

B. ASME Compliance: Boilers shall bear ASME “H” stamp and be National Board listed.

C. FM Compliance: Control devices and control sequences according to requirements of FM.

D. Comply with NFPA 70 for electrical components and installation.

E. IRI Compliance: Control devices and control sequences according to requirements of IRI (GE GAP).

F. CSD-1

G. SCAQMD Rule 1146.2 for low NOx equipment

1.5 COORDINATION

A. Coordinate size and location of concrete bases. Contractor to verify that existing concrete base is sized adequately

1.6 WARRANTY

A. General Warranty: The special warranty specified in this Article shall not deprive the Owner of other rights the Owner may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by the Contractor under requirements of the Contract Documents. Installing contractor shall provide one year of warranty parts and labor.
B. Special Warranty: Submit a written warranty, executed by the contractor for the heat exchanger.

1. Warranty Period: Manufacturer’s standard, but not less than 10 years from date of substantial completion on the heat exchanger. To include condensate corrosion and thermal shock warranty on heat exchanger.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Available Manufacturers: Manufacturer shall be a company specializing in manufacturing the products specified in this section with minimum five (5) years’ experience. Subject to compliance with requirements, manufacturers offering boilers that may be incorporated into the Work include, but are not limited to, the following:

B. Design: Boilers shall be CSA design certified as a condensing boiler. Boilers shall be designed for a minimum of 5:1 continuous turn down with constant CO2 over the turndown range. The boiler shall operate with natural gas and have a CSA International certified input rating as noted on the drawings, and a thermal efficiency rating up to 99% at minimum input. The boiler shall be symmetrically air-fuel coupled such that changes in combustion air flow or flue flows affect the BTUH input without affecting combustion quality. The boiler will automatically adjust input for altitude and temperature induced changes in air density. The boiler will use a proven pilot interrupted spark ignition system. The boiler shall use a UL approved flame safeguard ignition control system using UV detection flame sensing. The UV detector shall be air cooled to prevent condensate formation and so designed as to prevent misalignment. The design shall provide for silent burner ignition and operation. The boiler shall be down-fired counter-flow such that formed condensate always moves toward a cooler zone to prevent re-evaporation. A corrosion resistant condensate drain designed to prevent pooling and accessible condensate trap shall be provided. In some jurisdictions, a means of neutralizing the condensate pH levels may be required. Boiler shall be able to vent a horizontal distance of 100 equivalent feet, 30.5m with a vent diameter equivalent to the combustion chamber outlet diameter.

C. Service Access: The boilers shall be provided with access covers for easily accessing all serviceable components. The boilers shall not be manufactured with large enclosures, which are difficult to remove and reinstall. All accesses must seal completely as not to disrupt the sealed combustion process. All components must be accessible and able to adjust with the removal of a single cover or cabinet component.

D. Indicating lights: Each boiler shall include a diagnostic control panel with a full text display indicating the condition of all interlocks and the BTUH input percentage. Access to the controls shall be through a completely removable cover leaving diagnostic panel intact and not disrupted.

E. Manufacturers: RBI (a Mestek Company) is the basis of design. Acceptable manufacturers shall be subject to compliance with requirements and shall be pre-approved by the owner.

2.2 COMPONENTS

A. Combustion Chamber: The combustion chamber shall be constructed of stainless steel. It shall be a down-fired design.

B. Heat Exchanger: Boilers shall be a stainless-steel fire tube unit designed for pressure firing and shall be constructed and tested for 160 P.S.I water working pressure and 210°F, 99°C maximum operating temperature, in accordance with the A.S.M.E. Section IV
Rules for the Construction of Heating Boilers. Units will have been subjected to a hydrostatic pressure test of 400 PSIG at the factory before shipment and they shall be marked, stamped with the A.S.M.E. Code symbol. Boilers with less than 400 psi pressure test will not be acceptable for this project. The fire tubes shall be of a down-fired counter-flow single-pass design. Stainless steel tubes will be rounded, rectangular tubes with an integral dimpled design. The tube sheet is fully symmetrical and conical in shape to allow it to act as a piston to reduce the intratubular stresses. This allows the unit to absorb expansion and contraction evenly across the tube sheet. The design will provide for equal temperature rise across the heat exchanger. The heat exchanger design should have no limitations on temperature rise or restrictions to inlet water temperature and a Cv 85.

C. Jackets: Painted Carbon Steel.

D. Gas Burner: The burner shall be metal fiber mesh construction, allowing high turndown of the fuel-air mixture. The burner flame shall burn horizontally and be of the pre-mix type with a forced draft fan. Burner shall fire to provide equal distribution of heat throughout the entire heat exchanger. The burner shall be easily removed for maintenance without the disruption of any other major component of the boiler. A window view port shall be provided for visual inspection of the boiler during firing.

E. Ignition components: Ignition system shall incorporate the ‘sure fire’ turbo pilot design. The pilot is completely independent of the burner system and installed as a single pilot ‘gun’ type arrangement. This pilot system shall provide a strengthened pin point flame. Pilot systems utilizing a dual function gas valve, hot surface ignition or direct spark to burner design shall not be accepted. The ignition hardware shall consist of Alumina ceramic insulated ignition electrodes and UV sensing tube permanently arranged to ensure proper ignition electrode and UV alignment.

F. Rated Capacity: The boiler shall be capable of operating at rated capacity with pressures as low as 3” W.C. at the inlet to the burner gas valve.

G. High Altitude: Boiler shall operate at altitudes up to 6,000 feet above sea level without additional parts or adjustments.

G. The burner shall be capable of 99% efficiency without exceeding a NOx reading above 20ppm.

H. The burner and gas train shall be provided with the following trim and features:

1. Burner Firing: Full modulation with 5:1 turndown @ Continuous CO2

2. Burner Ignition: Intermittent spark pilot

3. Safety Controls: Energize ignition, limit time for establishing flame, prevent opening of gas valve until pilot flame is proven, stop gas flow on ignition failure, and allow gas valve to open.

4. Flue Gas Collector: Enclosed combustion chamber with integral combustion air blower and single venting connection.

5. Gas Train: Manual ball type gas valves (2), main gas valve, manual leak test valve, pilot gas pressure regulator, and automatic pilot gas valve. All components to be factory mounted and CSD-1 compliant.

6. Safety Devices: Low gas pressure switch, air flow switch, and blocked flue detection switch, low water cutoff (manual reset), high temperature manual reset. All safeties to be factory mounted.

2.3 BOILER TRIM

A. Controls: The boiler control package shall be an MTI HeatNet integrated boiler management system. The control system must be integral to each boiler, creating a control network that eliminates the need for a “wall mount” stand-alone boiler system control. Additional stand-alone control panels, independent of a Building Management System (BMS), shall not be allowed to operate the boiler network.

The HeatNet control shall be capable of operating in the following ways:

1. As a stand-alone boiler control system using the HeatNet protocol, with one “Master” and one “Member” unit.

2. As a boiler network, enabled by a Building Management System (BMS), using the HeatNet protocol, with one “Master” and one “Member” unit.

3. As “Member” boilers to a Building Management System (BMS) with multiple input control methods.

4. Failsafe mode – When a Building Automation System is controlling set point, if communications are lost, the boiler/system will run off the Local set point.

5. Adaptive Modulation – Lowers the modulation rate of all currently operating boilers before a newly added boiler enters operation.

6. Priority Firing – Allows mixing of condensing, non-condensing base load and/or other combination of (2) functional boiler types utilizing (2) priority levels.

7. Available priority start/stop qualifiers shall be done using any combination of: A) Modulation Percentage B) Outdoor Air Temperature or C) Return Water Temperature.

8. Base Loading – Provides the ability to control (1) base load boiler with enable/disable and 4-20mA modulating signal (if required).

MASTER: A boiler becomes a Master when a resistance type 10K sensor is connected to the J10 “SYS/ DHW HEADER” terminals. The sensor shall be autodetected. The Master senses and controls the header/loop temperature utilizing a system set point. It uses any boilers it finds “HeatNet Members” or those defined in the control setup menus to accomplish this. The “Master” shall also have the option of monitoring Outside Air Temperature “OA” to provide full outdoor air reset functionality. Only one master shall be allowed in the boiler network.

When operating as a “Master”, the HeatNet control provides a stand-alone method using a PID algorithm to regulate water temperature. The algorithm allows a single boiler “Master” or multiple “Master + Member” boilers in a network of up to 16 total boilers.

The control algorithm is based upon a control band, at the center of which is the set point. While below the control band, boilers are staged on and modulated up until the control band is entered. Once in the control band, modulation is used to maintain setpoint. Optimized system efficiency is always accomplished by setting the Modulation Maximum “Mod-Max” setting to exploit each boiler in the network’s inverse efficiency curve. The control shall operate so that the maximum number of boilers required, operate at their lowest inputs until all boilers are firing. Once all boilers are firing, the modulation clamp is removed and all boilers are allowed to fire above this clamped percentage up to 100%. This “boiler efficiency” clamp is defaulted to 80% and thus limits all the boilers individual outputs to 80% until the last boiler fires. The 80% default must be field adjustable for varying operating conditions. All boilers modulate up and down together always at the same modulation rate. Boilers are shut down only when the top of the band is breached, or before the top of the band, if the control anticipates that there is a light load. Timers shall also be included in each control in the network to prevent any boiler from short cycling.

MEMBER: Additional boilers in the network always default to the role of member. The lack of sensors connected to the J10 terminals “SYS/DHW Header” on each additional boiler shall ensure this.

Each “Member” shall sense its supply outlet water temperature and modulate based on signals from a Building Management System (BMS) or “Master” boiler. When operating as a member, starting, stopping, and firing rate shall also be controlled by the “BMS” or “Master” boiler.

When using the HeatNet protocol, the system setpoint shall be sent from the “Master”, along with the modulation value to control firing rate. It also receives its command to start or stop over the HeatNet cable. Each “Member” will continuously monitor its supply outlet temperature against its operating limit. If the supply temperature approaches the operating limit temperature (adjustable), the boilers input control rate is limited and its modulation value decreases to minimize short cycling. If the operating limit is exceeded, the boiler shall shut off.

When communicating to the HeatNet protocol via BMS only the master needs to receive the BMS signal. The master will communicate the status, temperatures, runtime and fault history of all boilers on the network.

Each HeatNet control in the boiler network shall have the following standard features:

A. Building Management System (BMS): MODBUS standard protocol. (BACnet, LONWORKS and N2 optional protocols)

1. Digital Communications Control.

2. Analog 4:20 and 0-10vdc also supported.

3. Distributed control using HeatNet protocol for up to 16 total boilers.

4. System/Boiler operating status in English text display.

5. Interlock, Event, and System logging with a time stamp.

6. Advanced PID algorithm optimized for FlexCore boilers.

7. Four dedicated temperature sensor inputs for: Outside Air Temperature, Supply (Outlet Temperature, Return Temperature (Inlet)), and Header Temperature.

8. Automatically detects the optional temperature sensors on start up.

9. Touch Screen Display.

10. (8) Dedicated 24vac interlock monitors and 8 dedicated 120vac system monitors used for diagnostics and providing feedback of faults and system status.
11. Multiple boiler pump or motorized boiler valve control modes.

12. Combustion Air Damper control with proof time.

13. Optional USB/RS485 network plug-in to allow firmware updates or custom configurations.

14. Optional BACnet, LONWORKS and N2 interface.

15. Alarm contacts.

16. Runtime hours.

17. Outdoor Air Reset with programmable ratio.

18. Time of Day clock to provide up to four (4) night setback temperatures.

19. Failsafe mode when a Building Management System (BMS) is controlling set point. If communications are lost, the boiler/system shall run off the Local Set point.

20. Support for domestic hot water (DHW) using a 10k sensor or a dry contact input from a tank thermostat and a domestic hot water relay (pump/valve).

21. Continuous Daily Runtime Restart feature that monitors the runtime of each boiler and if any in the network have exceeded 24, hours of continuous runtime, the boiler is restarted to protect the UV flame scanner.

22. Allows for selection of any boiler in the network to act as Lead Boiler.

23. Adaptive Modulation feature in which the Master boiler adjusts the system modulation rate to a lower value when a new boiler in the network is started to compensate for the added BTU’s to the system. Once the newly added boiler fires and the adjustable timer expire, the Master resumes control of the system modulation to maintain setpoint temperature.

24. Priority firing – Allows mixing of condensing and non-condensing, base load and/or other combination of (2) functional boiler types utilizing (2) priority levels.

25. Available priority start/stop qualifiers shall be done using any combination of: A) modulation percentage B) outdoor air temperature (or) C) return water temperature.

26. Base Loading – Provides the ability to control (1) base load boiler with enable/disable and 4-20mA modulating signal (if required).

B. Safety Relief Valve: ASME rated, factory set to protect boiler and piping as per schedule/drawings. 160 psi maximum allowable working pressure.

C. Gauge: Combination water pressure and temperature shipped factory installed. LCD outlet temperature readout to be an integral part of the front boiler control panel display to allow for consistent easy monitoring of temperatures factory mounted and wired.

D. Burner Controls: Boiler shall be provided with a Honeywell RM7800 series digital flame safe guard with UV rectification. The flame safe guard shall be capable of both pre and post purge cycles.

E. High Limit: Temperature control with manual reset limits boiler water temperature in series with the operating control. High Limit shall be factory mounted and sense the outlet temperature of the boiler through a dry well.

F. PROVIDE THE FOLLOWING STANDARD TRIM:

1. Low Air Pressure Switch

2. Blocked Flue Detection Switch

3. Modulation Control

4. Temperature/Pressure Gauge

5. Manual Reset High Limit (CSD-1 Factory Mounted and Wired)

6. Low Gas Pressure Switch (Above 2500 MBH)

7. Low Water Cutoff with Manual Reset (CSD- 1 Factory mounted and wired)

8. Supply Outlet Temperature Display

9. Full Digital Text LCD Touch Screen Display for all Boiler Series of Operation and Failures

10. Air Inlet Filter

11. Combustion Air Fan with Safety Interlock

12. Condensate Drain

13. High Gas Pressure Switch (Above 2500 MBH)

14. Flow Switch Mounted & Wired

15. Relief Valve

G. PROVIDE THE FOLLOWING JOB SPECIFIC TRIM AND FEATURES:
1. Low Gas Pressure Switch

2. High Gas Pressure Switch

3. 230V 1PH (CK2000)

2.4 MOTORS

A. Refer to Division 15 Section “Motors” for factory installed motors.

B. Boiler Blower Motor: The Blower shall be a variable speed blower.

2.5 SOURCE QUALITY CONTROL

A. Test and inspect boilers according to the ASME Boiler and Pressure Vessel Code, Section IV. Boilers shall be test fired in the factory with a report attached permanently to the exterior cabinet of the boiler for field reference.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine area to receive boiler for compliance with requirements for installation tolerances and other conditions affecting boiler performance. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Install boilers level and plumb, according to manufacturer’s written instructions and referenced standards.

B. Install gas fired boilers according to NFPA 54.

C. Support boilers on a minimum 4 inches (100 mm) thick concrete base, 4 inches (100 mm) larger on each side than base of unit.

D. Install electrical devices furnished with boiler, but not specified to be factory mounted.

3.3 CONNECTIONS

A. Connect gas piping full size, to boiler gas train inlet with union.

B. Connect hot water piping to supply and return boiler tapings with shutoff valve and union or flange at each connection.

C. Install piping from safety relief valves to nearest floor drain.

D. Connect breeching to boiler outlet, full size of outlet. The boiler shall operate under positive (Category IV) or negative (Category II) stack pressure. Vent material must be listed AL29-4C Stainless Double Wall Stack for condensing appliances.

E. Electrical: Comply with applicable requirements in Division 16 Sections.

F. Ground equipment.

1. Tighten electrical connectors and terminals according to manufacturer’s published torque tightening values. If manufacturer’s torque values are not indicated, use those specified in UL 486A and UL 486B.

3.4 FIELD QUALITY CONTROL

A. Manufacturer’s Field Service: Engage a factory authorized service representative to supervise the field assembly of components and installation of boilers, including piping and electrical connections. Report results in writing.

1. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment. Boiler shall be commissioned by factory authorized technician. Contact local representative for factory authorized technician information.

B. Manufacturer’s representative shall supply a factory authorized service technician to start up the boilers.

3.5 CLEANING

A. Flush and clean boilers on completion of installation, according to manufacturer’s written instructions.

B. After completing boiler installation, including outlet fittings and devices, inspect exposed finish. Remove burrs, dirt, and construction debris and repair damaged finishes including chips, scratches, and abrasions with manufacturer’s stainless-steel polish.

3.6 COMMISSIONING

A. Engage a factory authorized service representative to provide startup service. Startup to be performed only after complete boiler room operation is field verified to offer a substantial load, and complete system circulation. One-year warranty shall be handled by factory authorized tech.

B. Verify that installation is as indicated and specified.

1. Verify that electrical wiring installation complies with manufacturer’s submittal and installation requirements in Division 16 Sections. Do not proceed with boiler startup until wiring installation is acceptable to equipment Installer.

C. Complete manufacturer’s installation and startup checklist and verify the following:

1. Boiler is level on concrete base.

2. Flue and chimney are installed without visible damage.
3. No damage is visible to boiler jacket, refractory, or combustion chamber.

4. Pressure reducing valves are checked for correct operation and specified relief pressure. Adjust as required.

5. Clearances have been provided and piping is flanged for easy removal and servicing.

6. Heating circuit pipes have been connected to correct ports.

7. Labels are clearly visible.

8. Boiler, burner, and flue are clean and free of construction debris.

9. Pressure and temperature gauges are installed.

10. Control installations are completed.

D. Ensure pumps operate properly.

E. Check operation of gas pressure regulator device on gas train, including venting.

F. Check that fluid level, flow switch, and high temperature interlocks are in place.

G. Start pumps and boilers, and adjust burners to maximum operating efficiency.

1. Fill out startup checklist and attach copy with Contractor Startup Report.

2. Check and record performance of factory provided boiler protection devices and firing sequences.

3. Check and record performance of boiler fluid level, flow switch, and high temperature interlocks.

4. Operate boilers as recommended or required by manufacturer.

H. Perform the following tests for maximum and minimum firing rates for modulating burner. Adjust boiler combustion efficiency at maximum and minimum modulation rates. Perform combustion flue gas test at minimum and maximum modulation rate. Measure and record the following:

1. Differential pressure across air / gas orifice.

2. Combustion air temperature at inlet to burner.

3. Flue gas temperature at boiler discharge.

4. Flue gas carbon dioxide, oxygen, and carbon monoxide concentration.

5. Flue gas NOx emissions where applicable.

6. Natural flue draft.

I. Measure and record temperature rise through each boiler.

3.7 DEMONSTRATION

A. Engage a factory authorized service representative to train Owner’s maintenance personnel as specified below:

1. Operate boiler, including accessories and controls, to demonstrate compliance with requirements.

2. Train Owner’s maintenance personnel on procedures and schedules related to startup and shutdown, troubleshooting, servicing, and preventive maintenance.

3. Review data in the maintenance manuals. Refer to Division 1 Section “Contract Closeout.”

4. Review data in the maintenance manuals. Refer to Division 1 Section “Operation and Maintenance Data.”

5. Schedule training with Owner with at least 7 days advance notice.

END OF SECTION

Equipment Specification – Hot Water Heaters

The Phoenix® Gas-Fired Water Heater shall be manufactured by HTP with an identification of model number PHM199-100 and a modulation input range of 40,000 – 199,000 Btu/Hr. The Phoenix® Gas-Fired Water Heater shall operate on either Natural or LP gas.

The heater tank shall be constructed of 316L stainless steel. The primary condensing heat exchanger shall be constructed of 90/10 cupronickel. The secondary heat exchanger shall be constructed of 800H stainless steel and 90/10 cupronickel. Solar models shall have an additional heat exchanger on the bottom of the tank to connect to a solar system.

Tank insulation shall be 2” thick water blown foam. Insulation shall be enclosed in a plastic jacket. All components shall be located on the front of the heater for easy service access. All related hardware shall be constructed of stainless-steel studs with brass nuts. All water connection nipples shall be constructed of stainless steel and attached to the side of the tank. Multi Fit models shall have additional top mounted piping connections to increase installation flexibility. The top and bottom of the tank shall be smooth.

The heaters shall be ETL listed and will exceed the minimum efficiency requirements of ASHRAE 90.1b-1992. All heaters shall be approved in accordance with ANSI Z 21.10.3. All heaters will be supplied with a factory installed ASME rated temperature and pressure relief valve, a low water cutoff, a high temperature switch, an upper hot water sensor, a lower cold-water sensor, and a condensate trap assembly ready for easy connection to a field supplied condensate drain.

The heater shall have an integrated digital controller device with integral diagnostics, LED fault and temperature settings for establishing set point and temperature differential. Ignition shall be direct spark and take place at a speed pre-set for the burner blower. The control shall utilize an algorithm to fully adjust the burner modulating firing rate while maintaining the desired temperature. In Sanitizer models, the controller is set to provide 184°F operating temperature with an adjustable 2°F differential to maintain temperature for sanitation purposes. The pre-mix stainless steel burner uses a 120-volt motor with pulse wave modulation control to change the fan speed, thus the combustion air volume of fuel and air through the burner to establish a continuous BTU input range equal to the water heating set point requirement. The digital LED control display shall provide means, via push buttons, for adjustments of operating temperatures, differential adjustment, ECO reset, service mode, and real time status mode. The control shall have low voltage inputs to accept a 0-10 volt from a building management system or outdoor sensor to alter the set point of the water heater. The unit will also have line voltage outputs for connection to a condensate pump and alarm output that will alert user of fault in the water heater for service. In addition, there shall be provided a computer connection for history, including all fault codes and hours of operation above 50% input, below 50% input, as well as real time status reporting of all operations. The burner assembly shall be mounted so as to be easily removed as an integral unit for ease of service.

The heater combustion system can be designed for either two pipe (intake and exhaust) closed combustion, or a single pipe system taking mechanical room air and piping exhaust outside. PVC Schedule 40/80, CPVC Schedule 40/80, Polypropylene or stainless steel AL29-4C piping materials are approved for venting applications (see installation manual for further venting details). (NOTE: Foam core pipe is not an approved venting material.) The vent connections (intake and exhaust) shall be located on the bottom of the heater.

Appliance venting can be installed using several different methods, including:

Horizontal Venting shall be done as a balanced system only, thus requiring both intake and exhaust to terminate on the same side of the building.

Vertical Venting shall be done either as a balanced or unbalanced system. An unbalanced system shall ONLY be allowed when the exhaust is installed vertically and the intake horizontally. Both exhaust and intake must remain within the heater’s combined equivalent length. (Refer to heater installation manual venting section for additional venting requirements.)

Indoor Combustion Venting from a Confined or Unconfined Space – Where the exhaust runs vertically and combustion air is drawn either from the mechanical room or from outdoors.

The total combined length of exhaust and intake vents cannot exceed 85 combined feet for 2” venting or 200 combined feet for 3” venting. Adequate combustion air must be supplied when drawing air from the mechanical room. Avoid the room contaminates listed in the installation manual. (Refer to appliance installation manual venting section for additional venting requirements.)

The heater shall be in compliance with the NOx emissions limit set forth in SCAQMD Rule 1146.2. The heater shall be factory assembled, test-fired for correct BTU input, and adjusted for proper combustion parameters. Complete operating and installation instructions shall be furnished with every heater as packaged by the manufacturer for shipping.

The heater shall operate at altitudes up to 4500 feet above sea level without additional parts or adjustment.

The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as required by the Safe Drinking Water Act, Section 1417.

Maximum unit dimensions shall be length 38” inches, width 27” inches and height 63” inches. Maximum unit weight shall be 315 pounds.

END OF SECTION

Equipment Schedule

General Items
The successful bidder must provide proof of workers compensation insurance at statutory requirements and liability insurance in the amount of $1,000,000 per occurrence and $3,000,000 aggregate.
The successful bidder must provide a performance bond in the amount of the bid.
Project must meet latest IBC.
Questions about the bid specs should be directed to Dan Petz at (620) 770-1374 or Al Weise at (620) 770-0021.
Questions about the bid should be directed to Kent Adams at (620) 672-2724.
Bids must be submitted by June 10, 2019 at 3:00 pm.
All bids are subject to the following conditions:
1) Pratt Community College reserves the right to accept or reject any and all bids in whole or in part.
2) Bids received may not be withdrawn for a period of 30 days after date of bid opening.
3) Bids must be signed and dated by an authorized company representative.
4) Bids must be marked with the bid number.
5) The bids are to be mailed, faxed or emailed to:
Kent Adams
VP Finance and Operations
348 NE SR 61
Pratt, KS 67124
(620) 672-2724 - Office
(620) 450-2200 - Fax
kenta@prattcc.edu
6) Shipping Address:
Pratt Community College
348 NE SR 61
Pratt, KS 67124

7) Invoices will be paid net 30 days.
8) All items FOB Pratt Community College.

Project Type: 

Closing Time: 

Monday, June 10, 2019 - 3:00pm

Groups audience: