Air control method for air handler unit
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Solution Overview
Problem
Existing air handler units with ECM motors suffer from poor dehumidification performance due to fixed air volume settings, which result in inefficient operation when transitioning between cooling and dehumidification modes.
Innovation Solution
A control system and method for an ECM motor in a dual flow air treatment unit that includes a dehumidification control signal connected to a gear lower than the fan control signal, allowing the thermostat to switch between fan and dehumidification control signals based on a preset temperature threshold, ensuring optimal dehumidification performance without compromising cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan control signal G is set to connect to the ECM motor in the fifth gear (highest speed) during installation, then the indoor temperature is reached quickly and cooling efficiency is improved, but when the set temperature is reached and the machine is stopped, the dehumidification function is stopped, resulting in poor dehumidification performance
Solution Approach 1:
The patent applies dynamics by making the ECM motor speed variable rather than fixed. The motor operates at different speeds depending on the operational mode: fifth gear (highest speed) during active cooling for rapid temperature reduction, and first gear (lowest speed) during dehumidification for continuous moisture removal. This dynamic speed adjustment based on operational requirements resolves the contradiction between cooling efficiency and dehumidification performance.
Solution Approach 2:
The patent changes the operational parameter (motor speed/gear position) based on the operational mode. By switching between different speed gears of the ECM motor according to whether the system is in cooling mode or dehumidification mode, the patent optimizes performance for each specific function, thereby resolving the contradiction between high-speed cooling efficiency and low-speed dehumidification effectiveness.
2Ease of operation
If the ECM motor operates on a fixed single gear during use, then the equipment is simple to operate and install, but the air volume cannot be adjusted according to different operational requirements, resulting in poor adaptability
Solution Approach 1:
The patent implements dynamic speed adjustment of the ECM motor based on operational mode without requiring complex user intervention. The system automatically switches between first gear for dehumidification and fifth gear for cooling, maintaining ease of operation while achieving high adaptability to different operational requirements.
Solution Approach 2:
The patent uses feedback from the operational mode (cooling vs. dehumidification) to automatically adjust the motor speed. The control system receives feedback about the current operational requirement and accordingly selects the appropriate gear position, eliminating the need for manual DIP switch adjustments while providing adaptive performance.
3Reliability
If the fan control signal G is directly connected to the ECM motor for safety reasons, then the fan is ensured to be turned on when the auxiliary heat source is turned on, but the fan runs at fixed high speed regardless of temperature conditions, resulting in energy waste and poor dehumidification
Solution Approach 1:
The patent applies dynamics by making the fan speed variable based on operational mode and temperature conditions. Instead of running at fixed high speed, the ECM motor operates at first gear during dehumidification when safety is less critical and at fifth gear during active cooling when rapid temperature reduction is needed. This dynamic adjustment maintains necessary safety while significantly improving energy efficiency.
Solution Approach 2:
The patent changes the motor speed parameter according to operational requirements. By switching between different speed gears based on whether the system is in cooling mode or dehumidification mode, the patent optimizes energy consumption while maintaining adequate fan operation for safety-critical functions.
Data Source
AI summary
The present disclosure relates to the field of air conditioning technology. In particular, it involves an air control method for air handler unit.