POINT REYES NATIONAL SEASHORE

Point Reyes Station, California

Replace Limantour Lodge Boiler Heating System

CONSTRUCTION SPECIFICATIONS

NATIONAL PARK SERVICE (NPS)

Point Reyes National Seashore

August 18, 2026

SECTION 23 52 00 – RESIDENTIAL PROPANE-FIRED BOILER

PART 1 – GENERAL

1.1 SUMMARY

A. This Section specifies a propane floor mounted boiler heat system to be installed at Limantour Lodge on the Point Reyes National Seashore, California.

B. The existing malfunctioning boiler system is to be removed and disposed of in a legal manner.

C. Installation of the new system shall include all piping, wiring, ducting, and electrical system upgrades needed to install the new boiler to function effectively. This will include replacing the 4-zone manifold, isolation valves and actuators and adding a feed water system to maintain the correct water pressure in the boiler. The tank for the feed water system should be filled with distilled water to flush the system, and an additional 12 gallons of distilled water should be left onsite for ongoing use.

D. Provide and install one (1) propane-fired, high-efficiency, condensing hot water boiler for residential space heating which will include:

1. Floor standing 95% efficient fire tube boiler with stainless steel heat exchanger converted to propane

2. Pump isolation valves

3. New 4 zone stainless steel manifold, actuators and zone valves

4. New PVC flue pipe

5. New condensates drain

6. New boiler pump

7. Electrical for pumps and line power

8. Surge protector

9. Control electrical connection

10. All necessary boiler piping using type L copper tube

11. Minor boiler re-piping as needed

12. New air vent

13. New fill valve

14. All piping will be insulated with closed cell foam pipe insulation

15. Recycling of all existing equipment

E. Basis of Design:

• Manufacturer: Lochinvar

• Series: Knight Fire Tube

• Model: KHB085N-100

• Fuel: Propane (LP)

• Maximum Input: 85,000 BTU/hr

F. System shall include boiler, controls, venting, hydronic accessories, and all appurtenances necessary for a complete and operable installation.

1.2 REFERENCES

Comply with the latest adopted editions of:

• International Mechanical Code (IMC)

• International Fuel Gas Code (IFGC)

• NFPA 54 – National Fuel Gas Code

• NFPA 58 – Liquefied Petroleum Gas Code

• ASME Boiler and Pressure Vessel Code, Section IV

• ANSI Z21.13 / CSA 4.9 – Gas-Fired Low-Pressure Boilers

• NPS Director’s Orders #50B

1.3 SUBMITTALS

A. Product Data:

• Manufacturer’s cut sheets

• Venting and combustion air requirements

• Electrical characteristics and control logic

B. Shop Drawings:

• Boiler piping connections

• Vent and combustion air routing

• Control wiring schematic

C. Operation and Maintenance Manuals.

1.4 QUALITY ASSURANCE

A. Boiler shall be factory-assembled, tested, and listed by a nationally recognized testing laboratory.

B. Installer shall be qualified and experienced with condensing propane-fired hydronic boilers.

PART 2 – PRODUCTS

2.1 BOILER

A. Type:

High-efficiency, condensing, sealed-combustion, propane-fired hot water boiler.

B. Construction:

• Fire-tube heat exchanger constructed of stainless steel

• Fully insulated steel jacket

• Floor-mounted configuration

C. Performance:

• Maximum Input: 85,000 BTU/hr

• Thermal Efficiency: ≥95% AFUE

• Turndown Ratio: Minimum 10:1

• Maximum Allowable Working Pressure: 50 psig

• Maximum Operating Temperature: 190°F

D. Combustion System:

• Fully modulating, pre-mix burner

• Electronic ignition

• Designed for LP (propane) fuel

E. Electrical:

• 120V, single-phase power

• Integrated low-voltage controls

F. Listings and Certifications:

• ASME Section IV

• ANSI Z21.13 / CSA 4.9

2.2 CONTROLS AND SAFETIES

A. Factory-integrated microprocessor-based control system including:

• Adjustable supply water temperature setpoint

• Outdoor air reset capability

• Boiler pump control

• Domestic hot water priority capability (if applicable)

B. Safety Devices:

• High-limit temperature control

• Low-water cutoff

• Pressure relief valve (ASME-rated)

• Flame safeguard with lockout

2.3 VENTING AND COMBUSTION AIR

A. Venting:

• Category IV, positive-pressure venting system

• Schedule 40 PVC, CPVC, polypropylene, or stainless steel venting as approved by manufacturer and code

B. Combustion Air:

• Direct-vent sealed combustion system

• Combustion air piping sized per manufacturer requirements

C. Vent and air terminations shall be located to minimize visual impacts and comply with clearance requirements.

2.4 HYDRONIC ACCESSORIES

A. Circulator Pump:

• High-efficiency ECM type, sized for system requirements

B. Expansion Tank:

• Diaphragm-type, properly sized for system volume

C. Additional Components:

• Air separator and automatic air vent

• Isolation valves and unions at boiler connections

• Backflow preventer and pressure-reducing fill valve

2.5 PROPANE GAS PIPING

A. Gas piping shall be sized for 85,000 BTU/hr input, propane service.

B. Materials shall comply with IFGC and NFPA 58.

C. Provide:

• Manual shutoff valve within 6 feet of boiler

• Sediment trap at boiler inlet

• Gas pressure regulator as required by propane supplier

PART 3 – EXECUTION

3.1 INSTALLATION

A. Install boiler in accordance with manufacturer’s instructions and applicable codes.

B. Maintain minimum clearances for service access and airflow.

C. Coordinate propane supply and electrical connections.

3.2 FIELD QUALITY CONTROL

A. Pressure test gas piping prior to connection.

B. Fill, purge, and balance hydronic system.

C. Verify proper venting, combustion air, and condensate drainage.

3.3 STARTUP AND COMMISSIONING

A. Startup shall be performed by a manufacturer-authorized technician.

B. Adjust combustion and controls for propane operation.

C. Verify modulation, safeties, and system response.

3.4 TRAINING

A. Provide operational and maintenance training to NPS personnel.

PART 4 – NPS-SPECIFIC CONSIDERATIONS

A. Equipment shall be selected for reliability and serviceability in remote park locations.

B. Replacement parts shall be readily available through U.S.-based suppliers.

C. Venting and exterior penetrations shall be coordinated with park staff to minimize impacts to building appearance and historic fabric where applicable.

D. Installer shall provide manufacturer’s warranty information and a one-year workmanship warranty to

NPS.

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