Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Pilot light lit but no heat
the pilot's millivolt generator may be at fault. if you have a meter that is capable of measuring a very small DC voltage, connect it up to the very end of the thermocouple and the copper cappillary. the thermocouple has a welded bead at the very end inside that generates a small DC voltage. Same principle of a J-K thermocouple. Iron constintan - two dissimiller metals where joined together produce a voltage when heated. the thermocouple actuates a millivolt electromagnet inside the valve to keep the valve pellet open. no voltage there it won't actuate the electromagnet.
Posted on Oct 15, 2007
the mr heater series units have a millivolt generator connected to a very small sensitive electromagnet in the valve body. inside the generator is a small insulated wire connected to the very tip of the generator. that and the outside copper tube forms the j-k junction. at the other end, the part that goes into the valve is a silver button and a gland nut. this forms the other part of the electric circuit. the inside of the valve has a spring and an iron slug with a rubber pad. the slug gets sucked into the electromagnet when the magnet is operating and holds the pad off its seat allowing propane to go through the regulator and valve. change out your generator and I'm sure your problems will be solved. mr heater has a web site.
Posted on Nov 04, 2007
ok, your unit must be propane. look on the back where the propane line feeds the nozzle. there should be a very small copper line with two spade connectors on it. this is your millivolt generator line. with a flame at the nozzle the generator makes a very small electrical current which feeds to the main valve and keeps it open. take a piece of wire and jumper these two spade connections together and try lighting the unit again. if it stays on, the hi limit is shot. you can get by with the connections jumped out, you just don't have the safety margin if it were connected. IF with the spade connections jumped out the unit still shuts off, the generator tube needs to be changed.
Posted on Dec 26, 2007
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