home bbs files messages ]

Forums before death by AOL, social media and spammers... "We can't have nice things"

   alt.engineering.electrical      Electrical engineering discussion forum      2,547 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 936 of 2,547   
   Tom Biasi to Bob   
   Re: Schematic Symbol I Am Not Familiar W   
   09 Sep 13 16:02:36   
   
   From: tombiasi@optonline.net   
      
   On 9/9/2013 3:31 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   
   >   
   Without seeing it Bob it's difficult to say. Often relay coils are drawn   
   using just a rectangle with a lead at each end. Can you see where the   
   leads go? Is there a diode across the leads?   
      
   Tom   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca