Installation Plan for Ducted Air Supply Five-Constant System
System Components
Core Components: Yierp Five-Constant Main Unit, circulation pump, water distribution manifold, indoor thermostat, main unit wired controller, ducted indoor unit, and external air supply ducts. Piping Structure: The five-constant main unit outputs hot and cold water, which is sent to the ducted indoor unit. The indoor unit uses external ducts to deliver the temperature-controlled air to Room 1, Room 2, and Room 3, allowing multi-room temperature control. The water distribution manifold has reserved water connections, compatible with adding radiant terminals later. Electrical Part: Each room has its own indoor thermostat, which collects temperature and humidity signals and is wired to the main unit controller, enabling independent room control.
Applicable scenarios
This plan is an entry-level Five-Constant renovation solution, suitable for older homes with low ceilings that have already been renovated, or for flat apartments where you don't want to install radiant pipes across the ceiling and the budget is relatively limited. Many owners of fully furnished homes, who don't want to damage the existing ceiling or floor and can't lay radiant coil pipes, can opt for this ducted air solution. The whole system uses ducted air to regulate the temperature throughout the house, and later a fresh air dehumidification module can be added to upgrade it to a complete Five-Constant system.
Installation Tips
1. Duct Selection and Layout: For supply air ducts, it is recommended to use soundproof and insulated ducts to reduce airflow noise and meet the 'quiet' requirement of the Five-Constant system. Try to minimize bends in the duct path, as too many bends increase air resistance, causing insufficient air supply in distant rooms and large temperature differences. Install air volume control valves at each room's air outlet and perform air volume balancing during the installation stage to ensure even airflow to all three rooms.
2. Water Pipe Installation: The supply and return water pipes from the main unit to the ducted indoor units must be well insulated with rubber and plastic. Use red and blue pipes to distinguish supply and return water-red for supply, blue for return-and ensure clear labeling throughout construction to avoid confusion during future maintenance. Add protective sleeves where pipes pass through walls and fill the space between the sleeve and pipe with sealing insulation material to prevent cold bridges and condensation drips.
3. Control Logic Installation: Each room's thermostat needs to be wired separately. The thermostat collects real-time room temperature and humidity data and sends the signals back to the main unit controller. The system supports room-by-room start and stop; it operates when someone is in the room and lowers the load in unoccupied rooms, reducing energy consumption.
Pros and Cons of the Plan
Advantages: Construction is relatively simple, no need for large-scale floor or ceiling grooving, making it suitable for renovations after finishing; requires minimal ceiling work, with little impact on room height; fewer pipes, shorter construction period, and lower initial costs.
Drawbacks: Relies on air flow to distribute heating and cooling, which can cause slight airflow noise, so it's less quiet than a radiant system; direct air convection can feel less gentle than radiant heating or cooling; dehumidification depends on an external fresh air module-using just the duct system can only control temperature, so you need a combined fresh air dehumidifier to get full climate control.
Multiple fan coil units parallel five-constant system installation plan
System Components
Core components: YIERP Yierpu Five-Constant Main Unit, circulating water pump, water distribution manifold, multiple fan coil units (Fan Coil 1, Fan Coil 2, Fan Coil 3), independent room thermostats, and supply and return water pipelines. Pipeline structure: The main unit outputs hot and cold water, which is delivered to the manifold through the main pipeline. The manifold splits into independent water loops that connect to the fan coil unit in each room; each fan coil unit has its own supply and return branch, with red and blue pipes laid in parallel. Each room has its own thermostat, independently controlling the fan coil unit's on/off, fan speed, and set temperature. Neon indicator lines are added to the pipelines, clearly showing that each water loop circulates independently without interfering with each other.
Applicable scenarios
This is currently the most commonly used solution for decorating new single-floor homes. It's suitable for multi-story flats and small to medium villas, especially when there are many rooms and you want independent temperature control for each one, with the option for partial ceilings depending on the ceiling height. The fan coil units are compact, only needing a partial ceiling to hide the equipment, so you don't have to install radiant pipes throughout the whole house. It balances comfort, budget, and construction difficulty, making it a mainstream option that offers both cost-effectiveness and comfort.
Installation Key Points:
1. Hydraulic balance is critical. When multiple fan coil units are connected in parallel, the nearest circuits often get too much flow while the far rooms don't get enough, resulting in poor cooling/heating in those distant rooms. During installation, each branch of the distribution manifold must have a flow control valve. After filling and pressurizing the system, hydraulic balancing needs to be done to calibrate flow in every branch and ensure even heating/cooling in all rooms.
2. Fan coil installation standards: When suspending fan coils, vibration-damping hangers must be used to reduce vibration transmission to the ceiling and lower noise. The condensate drain pipes should have at least a 1% slope to prevent water from accumulating inside and causing leaks. Soft connections, valves, and filters must be installed at the fan coil water inlets and outlets to allow maintenance or isolation of individual units without affecting the whole system.
3. Pipe insulation and protection: All seams in chilled water pipe insulation must be sealed, with an additional protective layer outside to prevent condensation drips. Pipes should avoid intersecting high-voltage cables; water and power lines should be separated, and strong/weak power lines should keep at least a 30cm distance to avoid signal interference with thermostats.
4. Control wiring: Each room's fan coil thermostat should have independent wiring and communication. Users can set a lower temperature in the bedroom while the living room maintains different settings, allowing zoned control for flexible energy saving.
Pros and Cons of the Plan
Advantages: Independent zone control, rooms can be turned on as needed, energy consumption is manageable; fan coil units heat and cool quickly, responding fast; partial ceilings, minimal impact on ceiling height; easy maintenance later, a single unit failure doesn't affect other rooms.
Drawbacks: Fan coil units produce slight noise when running; relies on convective heat transfer, so the comfort feels less soft than a radiant system; still needs an independent fresh air dehumidifier to control humidity and achieve full five-constant conditions.
Fresh air dehumidifier - Five-constant solution with fan coil unit combination for living and dining room
System Components
Core components: Yierp Five-Constant main unit, circulating water pump, water distributor, fan coil units in the living and dining rooms, integrated fresh air dehumidifier, multi-room indoor thermostats, and main unit wired controller. Pipeline structure: The main unit has two water circuits. One circuit supplies water to the fan coil units in the living and dining rooms, handling temperature control for large open areas; the other circuit connects to the fresh air dehumidifier, which uses the main unit's heating and cooling sources to complete fresh air replacement and dehumidification. After the air is filtered, temperature-adjusted, and dehumidified by the fresh air unit, it's sent indoors, controlling the whole house's humidity and air quality. The separate thermostat in the living and dining room controls the fan coil, while the rest of the rooms' temperature and humidity are coordinated by the fresh air dehumidification system.
Suitable Scenarios
This is suitable for apartments with large living and dining areas but smaller bedrooms, especially for those concerned about indoor air quality or living in humid regions (the preferred option). The biggest challenge in these areas is high humidity-fan coils alone can only cool but can't control moisture at the source. During the rainy season, walls indoors are prone to dampness and mold. This setup tackles humidity with a fresh air dehumidifier, while the fan coil handles quick temperature adjustments in the large living and dining areas. Temperature and humidity are decoupled, achieving stable temperature, humidity, and oxygen levels all in one step.
Installation Key Points
1. Location of the fresh air dehumidifier: It's best to place it in the equipment room or inside the balcony ceiling. When hoisting the unit, also add vibration-damping accessories to reduce operating noise and vibration. The fresh air dehumidifier has an air inlet and an exhaust outlet, and both air ducts need to be properly insulated and sealed to prevent air leakage and condensation. Use sound-absorbing ducts for fresh air to reduce noise and keep things quiet.
2. Water system linkage: Connect the water loops of the fresh air dehumidifier and the living/dining room fan coil in parallel, and make sure there are valves and filters on both loops. During commissioning, calibrate the water flow in both circuits to ensure that when the fan coil and dehumidifier run simultaneously, the water temperature is stable and there's no competition for water.
3. Temperature and humidity linkage commissioning: This is what sets the five-constant system apart from ordinary dual-supply systems. The main unit has built-in dew point protection logic. The dehumidifier collects indoor humidity signals and automatically increases dehumidification when humidity exceeds the set threshold. The thermostat monitors the temperature and controls the fan coil in the living/dining room. During installation and commissioning, you need to set the temperature and humidity linkage parameters to prevent condensation on pipes or ceiling surfaces under high humidity and low temperature conditions.
4. Drainage: The dehumidifier produces a lot of condensate, so the drain pipe should be set up separately, with proper slope to avoid clogs or leaks.
Pros and Cons of the Plan
Advantages: Specifically enhances dehumidification, perfectly suited for the humid climate in the south; simultaneously brings in fresh air, filters dust, and maintains constant oxygen and cleanliness; the large living and dining areas are quickly temperature-controlled by fan coils, while bedrooms stay comfortable with fresh air; high system integration-one main unit supplies both fan coils and the dehumidifier.
Drawbacks: The fresh air dehumidifier requires ceiling space; with more equipment, piping and wiring get more complicated, demanding more experience from the construction team for setup; equipment costs are higher than just a fan coil system.
Ceiling radiant tubes, floor radiant tubes, fresh air dehumidifier five-constant solution
System Composition
Core Components: YIERP Five-Constant Host, circulating water pump, manifold, ceiling radiant coils, floor radiant coils, fresh air dehumidification unit, multi-zone indoor thermostats. Piping Structure: The host outputs hot or cold water, which is divided into two separate radiant loops through the manifold-one goes to the ceiling radiant coils, and the other goes to the floor radiant coils. The ceiling coils handle cooling in the summer, while the floor coils take care of heating in the winter. The fresh air dehumidifier connects to the host's water circuit to manage humidity and fresh air exchange throughout the house. The entire system relies completely on radiant heat transfer, with no air blowing, making it a truly draft-free five-constant system.
Applicable Scenarios
High-end villas, large flat apartments, and minimalist style projects with a sufficient budget and high ceiling. Perfect for creating a home with no draft, extremely quiet, and ultra-comfortable experience. This is the premium version of the Five-Constant System and is currently the most recommended solution for luxury residences. There's no feeling of blowing air, the indoor space is quiet with no noise, the temperature is even, and it feels most natural for the human body.
Installation Key Points
1. Radiant Coil Layout Process: Floor radiant coils are laid on top of the floor insulation layer, with spacing strictly set according to load calculations, usually 15-20cm. Ceiling radiant pipes are installed inside the suspended ceiling and fixed to the ceiling slab. Ceiling insulation is essential to prevent heat loss upwards and to avoid condensation on the ceiling. Ceiling radiation installation is the most challenging part of the system and requires very high construction skill and airtightness.
2. Condensation Protection Installation: This is the core risk point of ceiling and floor radiant systems. The Ilp Five-H Vacuum main unit comes with an automatic dew point tracking algorithm. On the hardware side, each room must have a humidity sensor to collect real-time air dew point data. Pipe insulation and ceiling sealing must be done properly in one go. After construction, dew point simulation and adjustment must be performed, setting a supply water temperature protection threshold. When indoor humidity approaches the dew point, the main unit automatically increases the supply water temperature to prevent ceiling condensation and mold.
3. Manifold and Hydraulic Balancing: Ceiling and floor radiant loops are two independent circuits. Each branch of the manifold has a flow control valve. After installation and pressure testing, fine hydraulic tuning is required to ensure uniform cooling in all ceiling areas and consistent heating distribution on the floor, avoiding local overcooling or overheating.
4. Fresh Air Dehumidification Support: Radiant systems have no convection and cannot remove indoor humidity, so they must be paired with a fresh air dehumidification unit, which cannot be skipped. The fresh air dehumidifier continuously replaces indoor air, maintaining relative humidity at 40%-60%, a comfortable range. This is essential for the stable operation of the radiant five-H system.
Pros and Cons of the Plan
Pros: No wind sensation, ultra-quiet, truly silent; uses radiant heat, so the temperature is evenly distributed and extremely comfortable; no blowing dust, keeping the air consistently clean; stable temperature and humidity all year round, no discomfort from air conditioning drafts. Cons: High cost; longest construction period, it's a fully concealed system that must be installed early in the renovation; requires very high insulation on the building envelope, if the wall insulation is poor, energy consumption will rise noticeably; future maintenance may require breaking the ceiling or floor, so construction quality needs to be strictly controlled from the start.
