A coordinated working proposal for up to four people. All pipe, cable, equipment and duct sizes shown here are preliminary allowances. The public connections, hydraulic calculations, electrical protection and final AVAC design still need project-specific engineering.
Three levels, one coordinated service strategy
The 30 September IFC and drawings define the lower living room, middle kitchen/laundry/WC and two upper bathrooms. Services use straight shared bands and a central internal service zone. Continuous swept bends and source-aligned IFC exports carry forward the Casa G corrections. Plan-derived fixture positions remain approximate; neither source IFC contains individual sanitary connector geometry.
Water and drainage
Separate drinking water, solar-assisted hot water and non-potable toilet supply with an isolated mains-backup inlet. Gravity drainage falls to a private collection point; a lifting station is conditional on the future public sewer invert. Individual traps, cleanouts and open roof ventilation are included as allowances.
Ventilation and comfort
Balanced ventilation and the kitchen grease hood are separate systems. Inverter AVAC has an outdoor-unit and indoor-unit route allowance; room-by-room heat gain/loss, refrigerant selection and condensate disposal remain to design.
Floor and service map
The diagram is a projection of routes intersecting the selected level band. Use the 3D model to inspect vertical connections, buried routes and external plant.6.9 kVA: workable with explicit limits
6.9 kVA is contracted power, approximately 30 A at 230 V. Keep a 10.35 kVA trial installation allowance for future flexibility. The controller targets 6.4 kVA and gives priority to essential pumps, refrigeration, alarms and ventilation. Solar production contributes no credit to evening peak demand. The 7.2 kW hob must be limited when other loads run; boost heating and laundry are scheduled away from cooking.
| Scenario | Unmanaged | Managed | Deferred / limited |
|---|
Steady-state examples do not prove motor-start performance. Controller interfaces and hygiene cycles must be commissioned; loads are rescheduled, not permanently disabled.
| Circuit | Load allowance | Points / controls | Trial Cu / breaker | Longest cable allowance | Voltage drop |
|---|
Lengths include shared containment, 10% slack and 2 m termination allowance, not purchase quantities. Warm-copper drop is calculated at full trial breaker current. Ampacity, grouping, fault current, earthing, discrimination, surge protection, residual-current type, cable core counts and pool/bathroom zones remain to verify. Individual 30 mA RCBOs are proposed for final circuits; inverter requirements may change their type.
Solar hot water and separate rainwater reuse
Solar-assisted hot water
Proposed: 250 L heat-pump cylinder + 3.6 kWp solar PV allowance, with mains backup. Four people at 50 L/day plus 20 L household use means 220 L/day at 40°C. At the Casa G study assumptions this needs about 2,802 kWh/year of heat; seasonal COP 3 gives about 934 kWh/year of electricity before PV.
Modelled storage: one 250 L domestic hot-water cylinder inside the central service zone. Solar means PV electricity assisting a heat pump in this option. No solar-thermal collectors, glycol collector circuit or battery storage have been modelled. A direct solar-thermal solution would be a different collector-and-cylinder specification. Full 2.5 kW electrical backup is reserved. Thermodynamic systems can absorb heat from rain via a refrigerant panel and compressor; rain impact is not a useful electricity source. Exact cylinder placement, ventilation/ducting, PV position, roof loading, shade, hot-water mixing, expansion and relief discharge remain to resolve.
Rainwater, garden and natural pool
The existing pool/tank is the seasonal rainwater store; the separate 5 m³ cistern has been removed. Roof runoff passes through filtration and a small collection/lift chamber into the pool. A dedicated treatment and pressure circuit supplies the toilet cisterns. A separate mains pipe terminates at an air-gap break unit, supplying the WC circuit during drought without topping up the pool. Garden irrigation has no mains backup and stops first. Pool overflow and the filtered storm bypass are routed to a modelled rear waterway. Channel geometry and discharge acceptance remain provisional.
Pool, downhill overflow and barbecue terrace
The channel follows the owner-indicated rear location, offset from the surveyed boundary. Its 0.8 m depth and 2 m top width are visual coordination assumptions, not measured terrain or a hydraulic design. Confirm the bed, flood level and discharge quality with the water authority before building the outfall. The existing architecture remains unchanged.
Two sources, protected pool reserve
Normal: pool → treatment/quality release → break/pressure unit → WC cisterns.
Drought or fault: mains → certified air gap → small break unit → the same WC supply. Pool abstraction closes; the bulk pool is never filled from this backup.
Parallel source pipes meet only inside an approved separation assembly. This does not mean a direct tee or changeover valve between drinking water and pool water.
The buried roof collectors are below the intended pool water level, so this routing includes a small rain-transfer lift (P4). Its storm capacity, head and bypass require hydraulic design.
Test the proposed level controls
Demonstration of proposed logic, not a live equipment control. Quality approval is currently unresolved. Water quality must be assessed specifically for reuse from a swimming/natural pool; ordinary rainwater guidance alone does not establish suitability.
Verified geometry—and visible remaining work
Collision checking uses source triangles after a conservative bounding-box screen. Wall/slab sleeves are listed as requests, not authorised cuts. Circuit and pipe continuity is a coordination check; catalogue fittings, hydraulic sizing and installation certification are separate.
Review geometry and penetration requests
| Route | Source / category | Status |
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Sources and project decisions
The DFL project notes describe future public water, sewer and electrical infrastructure. This study does not reuse Casa G's utility email, pressure or sewer level. The upper-floor drawing and original model define the fixture groups; the earlier notes establish rainwater use for the garden/natural pool. Four occupants remain a working assumption. The owner confirmed use of the pool/tank for rainwater storage and toilet reuse, with a protected drought reserve on 17 October 2026.
Files and versions
Load only one MEP IFC coordinate variant. These are labelled coordination reservations, not certified installed products. Archived coordination proposal; original architecture and earlier revisions remain preserved.