Good Morning Tim,
First this furnace is so old that it does not have a circuit board.
The terminal strip is labeled as follows:
R = red wire from thermostat
G = blue wire from thermostat
O = no wires
W = both W1/W2 & W are jumpered, black wire (not sure where it is comming from as I am not at the furnace) connected to W1/W2 along with white wire from thermostat and yellow wire connected to W (again not at the furnace) but they go to the blower relay.
E = no wire in or out
C = no wire in but out to terminal 1 on BR
OTC = black wire in (not sure from where) no wire out
OT-1 = yellow wire in (not sure from where) no wire out
OT-2 = no wire in or out
OT- 3 = no wire in or out
The otc connection show that if anything is connected it goes to the EHR
The thermostat wires only have 3 wires but there are 2 of them. One is not connected to anything(the other is connected as mentioned above) so I was going to take the red wire and connect it to the y connection at the thermostat but did not know where to connect it at the furnace. Now is I understand you correctly, I can connect that right to the 24v wire coming from the condenser and connect the other to the c terminal.
There is a note on the diagram reads as follows: Remove black jumper wire from blower relay terminals 4 & 6 for 2 speed operation. (Terminal 4 for cooling and terminal 6 for heating).
That is the only reference to cooling on this diagram.
I hope that I am on the same page as you as this person is a good friend but really is to cheap to update his furnace and has asked me to hook up the a/c. I don't want to hook it up and blow something out and now I am stuck for a new unit.
Can you please add my work email [email protected] so I receive it at both accounts?