Method Statement: Installation of Ceiling-Suspended Fan Coil Units (FCUs) – Method Statement

Work Included

• Layout, marking, and installation of post-installed anchors in soffits for FCU suspension.
• Supply and installation of hanger rods, channels, and vibration isolators (spring/neoprene) for ceiling-suspended FCUs.
• Safe lifting, positioning, and fixing of FCUs to isolators; precise leveling/alignment per manufacturer.
• Connection of flexible air ducts, spigots, and plenums; sealing to required duct leakage class [Verify per project specifications].
• Installation and connection of chilled water (CHW) valve packages (isolation valves, control valve, strainer with blowdown, unions, pressure/temperature test points), and flexible braided hoses.
• Installation of condensate drain, P-trap sizing and arrangement, cleanouts, and functional/leak testing.
• Insulation and vapor barrier continuity for CHW pipework, valves/boxes, flexible hoses, and condensate drains, including sealing of penetrations.
• Tagging/labeling, supports, and identification arrows; prelim functional checks (valve actuation, fan run test if power available).
• QA/QC inspections, records, and HOLD POINT: pre-close inspection prior to ceiling closure.

Exclusions

• Final TAB and system commissioning beyond pre-commissioning checks [By others unless stated].
• Permanent power supply and BMS programming [By others unless stated].
• Ceiling grid/tiles installation and builders' finishing works.

Interfaces

• Coordination with architectural ceilings, lighting, fire protection, and other MEP services.
• Coordination with structural engineer for anchor types/locations in load-bearing elements.

Approvals and Documentation

• Approved shop drawings, coordination model, structural approvals for anchors, and manufacturer installation manuals available at site.
• Approved Materials Inspection Requests (MIR) for FCUs, anchors, isolators, valves, hoses, insulation, and drains.
• Lifting plan and rigging certificates; operators certified for MEWP/rigging.
• Calibrations valid for torque wrenches, pull testers, pressure gauges, laser levels, scanners.

Site Conditions and Permits

• Permits to Work (PTW): Working at Height, Lifting, Hot Work (only if brazing), and Electrical Isolation as applicable [Verify per project HSE plan and local regulations].
• Confirm clear work area, temporary lighting, protection of finished surfaces, and safe access/egress.
• Coordination clearance: verify no clashes with fire sprinkler mains/heads, lighting, cable trays, other ducts.
• Verify soffit substrate (concrete strength, thickness, presence of PT cables/rebar) using scanner and records.
• Availability of CHW isolation for tie-ins/pressure test drains; access to water and approved drain for hydro/flush water disposal.
• Confirm ceiling grid datum; set benchmark elevation for FCU bottom relative to ceiling plane.

Key Hazards and Controls

• Hazard: Overhead lifting of FCU; falling load.
• Likely consequence: Serious injury/fatality, property damage.
• Engineering/procedural control: Approved lifting plan; exclusion zone with barrier tape; pre-use inspection of chain blocks/slings; lift under Lifting Supervisor; tag lines; no standing under load.
• Required PPE: Hard hat, safety boots, cut-resistant gloves, eye protection.
• Collective preventive measure: MEWP with guardrails; secondary retention (safety wires) on heavy components where specified.

• Inspection/permit/supervision: Lifting PTW; 3rd-party certs for lifting gear; recorded pre-lift checklist; competent rigger on site.

• Hazard: Drilling overhead into soffit; striking PT cables/rebar or embedded services; falling dust/debris.

• Likely consequence: Structural damage, electrocution, injury to eyes/respiratory system.
• Engineering/procedural control: Concrete scanning and marked safe zones; drilling stoppers for depth control; dust extraction attachments; use catch trays; isolate nearby electrical circuits where necessary.
• Required PPE: Safety glasses/face shield, FFP2/FFP3 respirator, gloves, hearing protection.
• Collective preventive measure: Task lighting; debris nets; spotter to control area.

• Inspection/permit/supervision: Permit to Drill where applicable; toolbox talk; equipment PAT and guards verified.

• Hazard: Working at height (MEWP/step-ups) in ceiling voids.

• Likely consequence: Falls, entrapment, sprains.
• Engineering/procedural control: MEWP operator certification; pre-use inspection; firm level floor; do not overreach; maintain 3-point contact on ladders; keep tools tethered.
• Required PPE: Harness with lanyard if required by MEWP type, non-slip footwear, helmet with chin strap.
• Collective preventive measure: Proper access platforms instead of improvised stands; edge protection where floor openings exist.

• Inspection/permit/supervision: Working at Height PTW; supervisor to monitor; daily MEWP checklist.

• Hazard: Manual handling of FCU and materials in confined ceiling spaces.

• Likely consequence: Musculoskeletal injuries, crush/pinch points.
• Engineering/procedural control: Use mechanical aids (MEWP/chain block); team lifts; planned handling route; keep hands clear during mating of isolators.
• Required PPE: Gloves, safety boots.
• Collective preventive measure: Pre-stage materials; reduce carry distances.

• Inspection/permit/supervision: Manual handling briefing; supervision during lift.

• Hazard: Hydrostatic testing and unexpected pipe rupture.

• Likely consequence: Water jet injury, flooding, slip hazards, damage to finishes.
• Engineering/procedural control: Temporary caps and restraints; pressure relief; slow pressurization; barricade area; use calibrated gauge.
• Required PPE: Eye protection, gloves, boots with slip resistance.
• Collective preventive measure: Spill trays; floor protection; wet vac available.

• Inspection/permit/supervision: Test permit/log; gauge calibration check; supervisor present.

• Hazard: Electrical/BMS terminations near metal casings.

• Likely consequence: Electric shock, short circuits.
• Engineering/procedural control: Lockout/Tagout (LOTO) for circuits; verify dead; correct fusing; strain relief and grommets; segregate power/control cables.
• Required PPE: Insulated tools, arc-rated gloves as required, eye protection.
• Collective preventive measure: Temporary power RCDs.

• Inspection/permit/supervision: Electrical PTW; testing by competent electrician.

• Hazard: Use of adhesives/mastics and insulation in confined areas (VOC exposure).

• Likely consequence: Respiratory/skin irritation, fire risk.
• Engineering/procedural control: Use low-VOC products where available; ensure ventilation; follow SDS; no ignition sources.
• Required PPE: Nitrile gloves, FFP2 mask (as needed), safety glasses.
• Collective preventive measure: Local exhaust or fans.
• Inspection/permit/supervision: SDS available; Hot Work PTW only if brazing is required [Verify per project HSE plan and local regulations].

Controls

• Dust and noise: Use drills with dust extraction and HEPA vac; wet methods not typically required; schedule high-noise tasks outside sensitive hours. Monitor noise per project limits [Verify].
• Waste segregation: Collect scrap metal (rods/channels), plastic (flex duct offcuts), and cardboard separately. Dispose adhesive/chemical containers as hazardous if labeled.
• Water management: Capture hydrotest water; discharge to approved drains only; prevent silt/debris entry via strainers; no discharge to landscape.
• Spill prevention: Use drip trays under valve package during testing; keep absorbent pads/spill kits at workface.
• Material storage: Store FCUs and insulation dry, off the floor, protected from UV and moisture.
• Energy and emissions: Switch off MEWPs and tools when not in use; minimize idling of delivery vehicles.
• Protection of finishes: Lay protective sheeting; avoid staining from primer/cement; immediate cleanup of any adhesive spills.
• Compliance: Follow project Environmental Management Plan and local regulations [Verify].

QA/QC Controls

• Submittals: Use only approved makes/models per MIR. Maintain on-site copies of approved drawings and manufacturer instructions.
• Anchors: Verify type, diameter, embedment, spacing, and edge distances per design. Record torque values and curing times for adhesive anchors. Proof-test sampling: 1 per 20 anchors per area or minimum 3 per day [Verify per project].
• Hangers/isolators: Check rod plumb (±2°), thread engagement (≥1.5×Ø), isolator deflection near design (±2 mm). Provide lock nuts and anti-vibration washers.
• Level/alignment: Record digital level readings; ensure FCU level within ±1 mm/m unless manufacturer requires fall to drain (typ. 0.5–1.0%).
• Duct connections: Confirm flex length ≤1.2–1.5 m and bend radius ≥1×Ø; joints sealed to specified leakage class; install balancing devices where shown.
• CHW valve package: Check valve orientation, union accessibility, strainer blowdown clearance; actuator stroke and fail position per controls strategy.
• Hydrostatic testing: Pressure, duration, and acceptance per ITP; protect finishes and record gauge serials and calibration.
• Condensate system: Slope ≥1%; trap height sized to fan negative pressure; perform leak and functional tests by filling drain pan; confirm float switch cutout if provided.
• Insulation/vapor barrier: Thickness per spec; no gaps; seams sealed; insulation carried over hangers; valve boxes accessible and sealed.
• Documentation: Maintain checklists, photos before ceiling closure, as-built markups, labels and tag lists. Close all punch items before HOLD point release.
• Measuring/test equipment: Use calibrated instruments; keep certs available.

Attachments/Records

• Approved shop drawings and coordinated reflected ceiling plans.
• Manufacturer installation manuals: FCU, anchors, isolators, valves, hoses, insulation, flexible ducts.
• Structural anchor design/calculations and anchor layout drawings.
• Lifting plan and lifting gear third-party certificates.
• Calibration certificates: torque wrench, pull tester, gauges, laser level, scanner.
• Checklists: layout, supports, valve package, duct connection, insulation, pre-functional.
• Test reports: anchor pull-out, hydrostatic test, condensate drain test.
• WIR/MIR logs; signed HOLD POINT release before ceiling closure.
• As-built markups and photographic records prior to ceiling closure.