From: dhky@shaw.ca   
      
   On 13/09/2013 3:24 AM, J.B. Wood wrote:   
   > On 09/09/2013 03:31 PM, Bob wrote:   
   >> Hello,   
   >>   
   >> Have a forced hot water system for home heating that uses the typical 2   
   >> wire Honeywell thermostat to control a Honeywell RA832A switching relay.   
   >>   
   >> The switching relay closes the circuit to the thermopile, as well as   
   >> closing the 110 V circuit for the water circulator.   
   >>   
   >> There is also a transformer that provides 24 V for the thermostat and   
   >> the relay.   
   >>   
   >> Question:   
   >>   
   >> Guess I'm dating myself somewhat here, but there is a symbol that I am   
   >> not familiar with in the instruction sheet for it.   
   >>   
   >> The secondary of the transformer (going to the thermostat) shows what is   
   >> similar tho the common resistor symbol of   
   >> 3 points up, and 3 points down from the baseline.   
   >>   
   >> But this symbol has only 1 point up, 1 point down, and then the return   
   >> to the baseline.   
   >>   
   >> I don't think it is meant to be a resistor.   
   >>   
   >> It is drawn close to the relay contact symbols.   
   >>   
   >> Could it be meant to be the coil for the relay, perhaps ?   
   >>   
   >> Or,... ?   
   >>   
   >> Thanks,   
   >> Bob   
   >>   
   > Hello, and just a thought: After reading and understanding (I think)   
   > schematics of radios, TVs, and audio components for years, I'm still   
   > often confused by the schematic symbols for wiring and electric   
   > components as used by the automotive industry.  And then there's those   
   > "single-point" diagrams used by electric power utilities to denote   
   > 3-phase AC power generation and distribution.  Sincerely,   
   >   
   The utility single line diagrams are simple-the needed information  is   
   there.  What isn't simple is some of the automotive wiring (including   
   the logic in some cases such as in an old VW van).This is a world of its   
   own.   
      
   --   
   Don Kelly   
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