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Home > Archive > Electrical Engineering > November 2007 > Relay Symbol ?
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| Robert11 2007-11-08, 1:25 pm |
| Hi,
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 (goint 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 sybols.
Could it be meant to be the coil for the relay, perhaps ?
Or,... ?
Thanks,
Bob
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| dave y. 2007-11-13, 3:25 am |
| On Thu, 8 Nov 2007 14:16:29 -0500, "Robert11" <rgsros@notme.com>
wrote:
>Hi,
>
>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 (goint 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 sybols.
>Could it be meant to be the coil for the relay, perhaps ?
>
>Or,... ?
>
>Thanks,
>Bob
>
Sometimes what you described is used to indicate a solenoid.
dave y.
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