The Five-Constant System usesYierp's four-pipe patent technology, allowing dual water temperature output. During operation, the system continuously checks the dew point to prevent condensation, achieving underfloor heating cooling. In the pure underfloor cooling mode, the main unit's water output goes directly to the dew point, without first going to 7 degrees and then mixing water, which directly reduces the main unit's energy consumption.
Operational Principles and Intelligent Control Logic
The YIERP five-constant system operates through a sophisticated, self-regulating control architecture:
Data Acquisition: The proprietary YIERP five-constant indoor thermostat - an independently developed component - employs integrated temperature and humidity probes to continuously and in real time collect environmental data from each room.
Secure Data Transmission: Collected data is transmitted to the host unit via YIERP's self-developed RS-485 fully enclosed communication protocol, ensuring data security and transmission integrity.
Dew-Point Calculation: Upon receiving the environmental data, the host unit computes the current ambient dew-point temperature and establishes the corresponding target safe water temperature - the critical parameter for preventing surface condensation.
Comparative Analysis: The system performs a continuous comparison between the target safe water temperature and the actual measured water temperature.
Intelligent Adjustment: When a deviation is detected, the host unit initiates intelligent variable water temperature regulation, incrementally adjusting output until the actual water temperature converges with the target value.
Stable Operation: Once convergence is achieved, the system enters stable operation, maintaining all five constants with minimal energy expenditure.
This closed-loop control architecture ensures that the system is not merely reactive but proactively anticipatory - continuously adjusting parameters before comfort thresholds are breached.
Specification
| Model | YEP-BPRB-08WH | YEP-BPRB-12WH | YEP-BPRB-14WH | YEP-BPRB-16WH | YEP-BPRB-17WH | YEP-BPRB-18WH | YEP-BPRB-22WH | YEP-BPRB-24WH | YEP-BPRB-28WH | YEP-BPRB-30WH | YEP-BPRB-35WH | YEP-BPRB-45WH |
| Power Supply | 220V～50Hz | 220V～50Hz | 220V～50Hz | 220V/380V～50Hz | 220V/380V～50Hz | 220V/380V～50Hz | 220V/380V～50Hz | 380V～50Hz | 380V～50Hz | 380V/3N～50Hz | 380V/3N～50Hz | 380V/3N～50Hz |
| Rated Heating Capacity (7/6℃) | 8.5kW | 12kW | 14kW | 16kW | 17kW | 18kW | 22kW | 24kW | 28kW | 30kW | 35kW | 45kW |
| Rated Heating Power Input | 2.42kW | 3.43kW | 3.9kW | 4.45kW | 4.86kW | 5.14kW | 6.1kW | 6.86kW | 8kW | 8.57kW | 10kW | 12.5kW |
| Rated Heating COP | 3.5 | 3.5 | 3.59 | 3.6 | 3.5 | 3.5 | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 | 3.6 |
| Max. Operating Current | 16A | 20A | 24A | 28A/14A | 32A/18A | 32A/18A | 34A/18A | 20A | 22A | 22A | 26A | 32A |
| Operating Ambient Temperature Range | -38℃-50℃ | |||||||||||
| A/C Heating Outlet Water Temp. Range | 30℃-55℃ | |||||||||||
| Radiant Heating Outlet Water Temp. Range | 25℃-50℃ | |||||||||||
| A/C Cooling Outlet Water Temp. Range | 5℃-25℃ | |||||||||||
| Radiant Cooling Outlet Water Temp. Range | 7℃-28℃ | |||||||||||
| Water Flow Rate (m³/h) | 1.8m³/h | 2.2m³/h | 2.4m³/h | 2.6m³/h | 3.0m³/h | 3.2m³/h | 3.5m³/h | 4.2m³/h | 5m³/h | 5.2m³/h | 6m³/h | 7.5m³/h |
| Water Inlet/Outlet Diameter | DN32 | DN32 | DN32 | DN32 | DN32 | DN32 | DN32 | DN32 | DN32 | DN40 | DN40 | DN40 |
| Refrigerant / Charge | R32/1.3kg | R32/1.5kg | R32/1.75kg | R32/2.2kg | R32/2.5kg | R32/2.6kg | R32/2.75kg | R32/3.0kg | R32/3.3kg | R32/3.5kg | R410A/7.5kg | R410A/8.5kg |
| Noise Level | ≤50dB(A) | ≤50dB(A) | ≤50dB(A) | ≤55dB(A) | ≤53dB(A) | ≤53dB(A) | ≤53dB(A) | ≤56dB(A) | ≤58dB(A) | ≤58dB(A) | ≤60dB(A) | ≤62dB(A) |
| Electric Shock Protection Class / IP Rating | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 | I类/IPX4 |
| Max. Working Pressure (Water Side) | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa | 1.0MPa |
| Max. Working Pressure (Heat Exchanger) | 4.4MPa | 4.4MPa | 4.4MPa | 4.4MPa | 4.2MPa | 4.2MPa | 4.2MPa | 4.2MPa | 4.2MPa | 4.2MPa | 4.2MPa | 4.2MPa |
| Allowable Operating Pressure (Suction/Discharge Side) | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa |
| Max. Allowable Pressure (Low/High Pressure Side) | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa | 1.5/4.2MPa |
| Unit Dimensions (LWH) mm | 970*390*1100 | 970*390*1100 | 970*390*1100 | 970*390*1100 | 970*390*1100 | 970*390*1440 | 970*390*1440 | 970*390*1440 | 970*390*1440 | 1200*420*1650 | 1200*420*1650 | 1200*420*1650 |
| Weight (kg) | 105 | 110 | 115 | 125 | 135 | 145 | 150 | 155 | 165 | 220 | 240 | 260 |
Health and Lifestyle Benefits
The YIERP five-constant system is engineered with particular attention to the needs of vulnerable household members. For the elderly, the elimination of direct air draughts, the maintenance of warm floors with cooler head-level temperatures ("warm feet, cool head"), and the absence of temperature gradients significantly reduce the risk of colds and respiratory irritation. For children, the continuous supply of fresh oxygen supports enhanced concentration during study and more stable sleep patterns. The consistent humidity control prevents the proliferation of mould and the warping of furniture, thereby extending the lifespan of household fixtures and finishes.
Auto-condensation prevention ensures that wall surfaces remain dry, wardrobes do not accumulate moisture, and the structural integrity of the home is preserved - particularly valuable during high-humidity seasons when conventional homes are prone to mould growth and material degradation.
Conclusion
The YIERP Five-Constant Variable-Frequency Domestic Heat Pump constitutes a comprehensive reimagining of residential environmental control. By unifying five historically disparate systems - heating, cooling, ventilation, dehumidification, and humidification - into a single, intelligently managed platform, YIERP delivers a "four seasons as spring" indoor environment that requires no seasonal reconfiguration and no occupant intervention. With three distinct host variants addressing applications ranging from simple floor-temperature regulation to full ceiling-floor radiant systems, and underpinned by proprietary communication protocols, patented control logic, and precision engineering, the YIERP five-constant system stands as a definitive solution for modern, health-conscious, comfort-driven residential climate management. One main unit plus one fresh air component - and five-constant comfort is achieved.
Yierp Five-Constant Mainframe Manufacturer
Radiant air conditioning heat source
Temperature and humidity dual control logic
The radiant pipes handle hot and cold temperatures, and the fresh air water pipes handle humidity and dryness. Both water systems can work at the same time, so there's no need to switch modes back and forth. Even during the super humid rainy season in the south, the radiant ends maintain safe high-temperature cold water to avoid condensation, while the fresh air water pipes output low-temperature cold water to fully dehumidify, so you won't get condensation or dripping indoors.
Core Feature Breakdown
The outdoor unit includes a full DC inverter EVI jet enthalpy compressor, evaporator, DC inverter fan, and electronic expansion valve, ensuring stable heating and cooling output at different outdoor temperatures. The built-in hydraulic unit integrates a dual waterway heat exchanger, two sets of variable frequency circulation pumps, a mixing valve assembly, water filters, and an exhaust pressure relief assembly.
Core security guarantee
The main unit connects to temperature, humidity, and dew point sensors distributed in each room via wired or wireless methods, collecting indoor environmental data in real time. The chip inside the main unit continuously calculates the indoor air dew point and automatically adjusts the supply water temperature on the radiant side, ensuring the surface temperature of the radiant panels is always higher than the dew point.
Our factory & Installation Case
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Yierp Five Constants Unit Operation Principle
| Five Constants Indoor Thermostat (Yierp Independently Developed) | |
| Temperature Probe | Humidity Probe |
| Yierp Independently Developerad 485 Fully Enclosed Communication lataProtocol (Secure Data Transmission) | |
| Data Transmitted to Yierp Five Constants Unit | |
| Main Unit Calculates Current Environmental Dew Point Temperature andand Sets Target Safe Water Temperature | |
| Five Constants Unit Intelligently Adjusts Water Temperature | |
| Actual Water Temperrmperature -> Adjustment Completed, Stable Operation | |
The installation schematic of the YIERP 5‑constant unit. It illustrates the pipeline and wiring connections between the 5‑constant main unit and components including air‑conditioning supply & return ports, radiation supply & return ports, fan coil units, manifolds, motorized valves and indoor thermostats. It marks each interface number and installation notes, clearly demonstrating the on‑site wiring and pipeline connection logic for the complete 5‑constant system.
the final view of project
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