Control unit for a gas burner

Combustion – Timer – programmer – retarder or condition responsive control – Igniter heat up and fuel feed sequence controlled by timer...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

431 71, 431 73, 431 74, F23N 520

Patent

active

041509382

ABSTRACT:
A control system for a gas burner of a domestic hot water system has a normally closed gas valve for controlling the supply of gas to the burner, and an electric solenoid for actuating the valve when energized by current of a first predetermined value. The solenoid can be held open by a current of a second predetermined value lower than the first. The solenoid current is derived from a mains a.c. supply through two thermistors in series. One of these thermistors has a negative temperature coefficient of resistance and provides a short delay to the operation of the solenoid when heat is initially demanded. The second thermistor, having a positive temperature coefficient of resistance, controls the valve lift time, that is to say, the limited time during which gas is supplied to the burner for enabling an attempt to ignite the burner to be made. The valve lift time is automatically reduced if the system is still hot from a previous operation, thereby preventing a possible explosion hazard.

REFERENCES:
patent: 3196923 (1965-07-01), Selinder
patent: 3393039 (1968-07-01), Eldridge

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Control unit for a gas burner does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control unit for a gas burner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control unit for a gas burner will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1989112

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.