"Ross Herbert" wrote in message
...
On Wed, 27 Jun 2007 07:39:10 GMT, Ross Herbert
wrote:


http://www.pbase.com/mrfixit/image/81163242


Midtex 15522T200 - Online Components
http://www.onlinecomponents.com/product/3123033
Appears to be 120V ac coil.


http://www.pbase.com/mrfixit/image/81163244

Midtex 15523Q200 - Online Components
http://www.onlinecomponents.com/product/3123040
Appears to be 24V ac coil

Midtex is now part of the Tyco brand stable but I can't locate the
part numbers on their site. Have requested specifications from Tyco
if available. Will post result.


PS. Since you say there is no DC power supply then it would appear
that photo 1 also shows an ac coil relay.

Perhaps whoever worked on it before was replacing parts and not too picky
about what types of relays were put in.

I have uploaded a schematic of the electronics which I drew from tracing all
the wires. I'd like to know if anybody can find any mistakes in the wiring
diagram.

http://www.pbase.com/image/81266775

Secondly, there is a bell hose that opens the gate from the inside of the
garage and a key that opens the gate from the outside. There is a second
hose whose sensor is not hooked up which runs underneath the gate when in
the closed position. I think this is a safety factor in case somebody drives
in and the gate starts to close and would prefer not having their car
smashed. As a security precaution, I think it would be smart to have this
second hose sensor only allowed to be activated if the gate is actually
closing. Where would be the correct spot, assuming one exists, to insert the
second hose sensor that would *only* open the gate if the gate is in the
process of closing?

Thanks for your reply.
--
David Farber
David Farber's Service Center
L.A., CA