1-Accessible IFB - Sanpete County District Courthouse VRF Retrofit Project.docx

Invitation for Bid (IFB): Sanpete County Courthouse VRF Retrofit Project

1. Project Information Location: Manti, Utah Delivery Method: Design-Build Bid Type: Lump Sum – No Change Orders

2. Procurement & Submission Instructions Procurement Type: This is an Invitation for Bid (IFB). The contract will be awarded as a Lump Sum to the lowest responsive and responsible bidder meeting all technical and qualification requirements.

Bid Submission Deadline: All bids must be submitted by 8/14/26, at 5:00 PM local time. Submission Method: Bids must be submitted electronically through the U3P-Bonfire platform. Late submissions will not be accepted.

Vendor Questions: All technical and procurement questions must be submitted via U3P-Bonfire platform.

Question Cutoff Deadline: The final deadline for question submission is 7/29/26, at 5.00 pm MDT.

Award Methodology: The county intends to award this contract to the single lowest-priced vendor whose bid fully complies with the strict design-build demands, historical constraints, and Daikin equipment mandates specified herein.

3. Project Description & Phasing This project consists of a complete retrofit of the existing air handling unit (AHU) and boiler system to a Daikin Variable Refrigerant Flow (VRV) heat recovery system. The scope includes demolition, engineering, system installation, electrical, controls, and architectural restoration.

Critical Execution Constraints:

· Operational Continuity: The existing heating and cooling system must remain fully operable until the new VRV systems are fully installed, commissioned, and ready to take over the load.

· Occupied Space Standards: The building will remain fully occupied during construction. The contractor must coordinate areas of construction a minimum of one (1) week prior to commencing work in any zone.

· Daily Maintenance & Cleaning: The contractor is required to clean up all material, dust, and debris, returning the jobsite to a clean condition daily.

· Phased Schedule: Construction must be carefully executed in phases over a maximum duration of 24 months. Bids must be held firm for the full duration of the project; no inflation adjustments will be granted.

4. Design-Build Contractor Responsibility The selected contractor assumes sole responsibility for the final system performance. Responsibilities include full mechanical design, certified engineering, strict trade coordination, installation, and manufacturer-validated commissioning.

5. Historical Building Constraints & Codes The Sanpete County District Courthouse is a protected historic structure.

· No Exposed Systems: No exposed piping, conduit, ductwork, or drains are allowed in any public or occupied spaces.

· Concealed Infrastructure: All lines must be completely concealed behind architectural features, inside existing floor chases, or within designated ceiling spaces.

· Architectural Restoration: Cutting and patching must be kept to a minimum. All finishes—including lath, plaster, molding, woodwork, and paint—must be meticulously restored and matched to the original historic finishes.

6. Equipment & System Specifications Only Daikin VRV equipment is permitted for the heat recovery loop; no equipment substitutions will be evaluated or accepted. All hardware must be selected to clear tight ceiling spaces and operate efficiently at the local project altitude of 5,700 feet above sea level.

6.1 Mechanical Equipment Schedule

Recovery modules. Units must include field-configured low-ambient wind baffles allowing stable cooling performance down to -4°F and code-compliant heating down to -22°F.

(5) BSF8A54AAVJ

6-Port Multi-Port Box and 8-Port Multi-Port Box used to manage simultaneous

heating and cooling zones via an integrated R32 safety shut-off valve network and standard factory-installed backup power supply.

(1) FXSA24AAVJU (2.0-Ton)

(1) FXSA30AAVJU (2.5-Ton)

(6) FXSA36AAVJU (3.0-Ton)

(8) FXSA48AAVJU (4.0-Ton)

(2) FXSA54AAVJU (4.5-Ton) Slender design units (9-11/16" height) with built-in condensate lift pumps.

(2) FXZA12AAVJU (1.0-Ton)

(2) FXZA15AAVJU (1.25-Ton)

(1) FXZA18AAVJU (1.5-Ton) Low-profile flush architectural design.

6.2 Piping, Filtration, and Control Accessories

· Refrigerant Speciality Kits: Includes (1) KHRA25M72TA and (1) KHRA25M73TA 3-Pipe REFNET branch joints, (1) BHFP26P100UA Dual Module Multi-Connection Piping Kit, (1) KHFA26P100UA Pipe Reducer Kit, (6) KHFP26A100CA Multi-Connection Kits, and (1) Closed Pipe Kit.

· Indoor Air Quality Filtration: All ducted indoor units must be equipped with dedicated MERV 13 bolt-on filter box cabinets to maintain clean air delivery. Include (3) DFBS39A13 kits, (14) DFBS55A13 kits, and (2) DFBS61A13 filter kits.

· Zone Controls: (32) Daikin BRC1NRV71 Navigation Remote Controllers using polarity-free, non-shielded 18AWG-2 stranded wiring running on the P1P2 protocol.

· Centralized Automation & BACnet: (1) Daikin DCM601B71 intelligent Touch Manager (iTM) centralized controller with a D3-D4 conversion adapter kit (BRD72A-L) to interface natively with the building's automation platform via a BACnet/IP Server Gateway.

7. Direct Scope of Work Breakdown

7.1 Demolition & Removal

Safely isolate, recover remaining refrigerant, disconnect, and completely remove existing central air handling units, localized VAV boxes, central hydronic boilers, associated hot/chilled water piping, and redundant pneumatic or legacy electronic control loops.

7.2 Mechanical & Refrigerant Piping Installation

· Install all outdoor condensing units on engineered equipment stands (provided by ICS) situated at the designated exterior location.

· Route all 3-pipe heat recovery refrigerant lines from outdoor modules to internal branch selector boxes. Copper must be clean, dry, braze-sealed under a continuous nitrogen purge, and completely insulated with closed-cell insulation tested under ASTM E84 Class A ratings.

· Modify existing sheet metal duct runs where feasible to distribute outside air from the new basement-mounted ERV system. Test, seal, and balance the complete air-side network to meet design CFM requirements.

7.3 Plumbing & Condensate Drainage

Provide and route a fully concealed, hard-piped condensate drainage system from every indoor ducted and cassette unit. All gravity or pump-assisted lines terminating at the building exterior must be equipped with specialized, freezeproof drain assemblies to prevent back-ups during freezing winter ambient conditions.

7.4 Electrical & Control Wiring

· Provide all high-voltage power feeds and low-voltage control wiring. The contractor must field-verify existing electrical panel capacities and provide required circuit breakers, conduits, safety disconnects, and line voltage connections to serve the multi-module condensing units (208-230V, 3-phase) and indoor fan coils (208-230V, 1-phase).

· Daisy-chain the communication network using standard AWG 18-2 non-shielded wire, integrating all components back to the central iTM controller and establishing verified BACnet IP object addressing.

7.5 Commissioning & Training

Perform full mechanical system pressure testing (minimum 550 PSI nitrogen hold), deep evacuation tracking below 500 microns, and an automated protocol check. Final equipment startup and controls integration must be performed under the direct, on-site supervision of a factory-certified Daikin technician. Provide a minimum of 3 days of project supervision, startup assistance, and comprehensive operations training for county maintenance personnel.

8. No Change Order Policy This solicitation is for a fixed, all-inclusive Lump Sum contract. Due to the design-build nature of this assignment, the contractor is entirely responsible for upfront field verification of all structural, architectural, electrical, and routing paths. Missing data, hidden routing obstacles, structural thickness, panel space limitations, or spatial coordination conflicts will not constitute grounds for additional compensation. No change orders will be evaluated or authorized during the 24-month execution period.

Required ADA Document Alternative Text Appendix (Keep this text intact inside your file. It ensures screen-reader users have equal access to the exact engineering configurations embedded within the technical system drawings).

System Layout Alt-Text Description: Figure 1 diagrammatically details a multi-floor layout of the courthouse. The basement houses the core mechanical room, boiler room, and a 3,200 CFM Greenheck ERV utilizing existing duct connections to distribute fresh air. The lower, main, and upper floor layouts show specific zones managed by concealed ducted units (DFCU) and flush-mounted ceiling cassettes (CCFCU). Condensing units (CU-1, CU-2, CU-3) are safely designated for flat roof or outdoor grade mounting on structural stands.

Piping Architecture Alt-Text Description: Figure 2 illustrates the 3-pipe refrigerant network topology. Multiple outdoor REYA144AATJA inverter modules connect via a BHFP26P100UA multi-connection kit into unified 24-ton circuits. Main lines route through KHRA series REFNET joints to feed branch selector boxes (BS-1-1 through BS-3-2). From the selector boxes, pairs of liquid and gas lines run independently to each fan coil unit to provide independent heating and cooling control.

Controls Loop Alt-Text Description: Figure 3 maps the automation system structure. High-voltage lines branch out from localized panels with minimum circuit amp (MCA) ratings ranging from 0.3A on small cassettes to 50A on the large outdoor modules. The low-voltage communication loop links all indoor fan coils and multi-port branch selector boxes to individual BRC1NRV71 wall controllers before terminating at the central DCM601B71 intelligent Touch Manager. This manager connects to the building's central monitoring network via a dual-port 100BASE-TX Ethernet interface using BACnet IP protocol mapping.