Topside Induced Draft Fan for Temporary Gas Heating Unit Operation
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Solution Overview
Problem
HVAC service technicians face challenges in safely operating gas heating units when the induced draft fan is inoperable, as immediate replacement is often necessary, which can delay operation until the correct model is acquired.
Innovation Solution
A device that adjusts vacuum pressure to close the pressure switch and regulate draft flow through the heat exchanger, allowing the gas heating unit to operate safely without replacing the induced draft fan, by utilizing a blower assembly and motor speed control switch to mimic the function of the inoperable fan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the induced draft fan is replaced immediately, then the gas heating unit can operate safely, but the operation is delayed until the correct model is acquired
Solution Approach 1:
A temporary induced draft fan device is introduced as an intermediary solution between the inoperable original fan and the permanent replacement. This temporary device restores vacuum pressure and draft flow functionality, allowing the heating unit to operate safely during the acquisition period of the correct replacement fan model.
Solution Approach 2:
The patent employs a temporary, short-term fan solution that does not need to be a permanent or exact match to the original fan. This temporary device serves its purpose during the transition period and can be removed once the proper replacement is installed, avoiding the time loss of waiting for the exact original fan model.
2Productivity
If the induced draft fan is not replaced, then immediate operation is possible, but the heating unit cannot operate safely
Solution Approach 1:
The temporary induced draft fan device acts as a mediator that restores the necessary vacuum pressure and draft flow conditions. By installing this intermediary device, the heating unit can immediately operate safely without waiting for the permanent replacement, bridging the gap between immediate operational needs and long-term safety requirements.
3Loss of time
If a temporary solution is used, then operation can continue without immediate replacement, but the device complexity increases
Solution Approach 1:
The temporary induced draft fan is designed as a simple, short-term solution that adds minimal complexity to the system. It can be easily installed and removed without complex modifications, providing a practical bridge solution that accepts temporary increased complexity in exchange for avoiding operational delays.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe and continued operation of gas heating units by maintaining vacuum pressure and draft flow, ensuring safe ignition and efficient combustion without requiring immediate replacement of the induced draft fan, allowing technicians to delay replacing the fan until a suitable replacement is available.
Implementation Method 1
This device is designed to adjust the vacuum pressure through the inoperable induced draft fan to close the pressure switch
Implementation Method 2
The motor used is a Rotom brand, 115-volt, 1.7 amp, 1/20 hp at 3400 RPM
Implementation Method 3
regulate the draft flow through the heat exchanger that will initiate startup and allow the gas heating unit to operate safely
Implementation Method 4
allowing the gas heating unit to operate safely without having to immediately replace the units induce draft fan
Data Source
AI summary
This concept is very new, and it will allow for safe and continuous operation of gas heating units when the induced draft fan no longer operates. This device will allow the HVAC service technician to continue to operate the gas heating unit until the proper replacement induced draft fan can be acquired and installed on the gas heating unit. This invention is a supplemental induced draft fan that will attach to the exhaust output side of a gas heating units inoperable induced draft fan to draft air through the heat exchanger and create a vacuum to the pressure switch at a rate to be regulated by a control switch to make the gas heating unit operate safely until the correct part is acquired and installed.