This RTU was taken care of by others until recently. On the same roof I discovered some smaller RTUS with economiser actuators that have two 24V wires and one single 10VDC wire. Those mounting brackets had been modified, and the dampers would not open as a result. I took care of those. Funny how easy a damper opens when the mounting bracket is not in its path.
Now that was just to lay some idea of what we might find on this particular unit. It serves an electrical room, and has one stage of economiser, and two stages of cooling. First, the economiser was not working so I had the controller do a self-test. It indicates "actuator" with three flashes.
Let me describe the parts a bit. FIrst the RTU is a carrier 50HJ014.
The economiser is a CRECOMZR005A02.
The controller is an AD DME 1711-1, is that a Johnson Controls?
The actuator is an M9204-CNA-2.
Back to the controller. It tells me "actuator" with three flashes.
I'd like to get my hands on the literature for this particular controller. The local Carrier rep got me the wiring diagrams for the rtu, since the old diagrams were faded into oblivion. Also he got me a small book on a slightly different controller???!!! AD DME 1701-1. The wiring and plug configs don't match up.
Is there a link to the literature for the AD DME 1711-1 controller?
I have the carrier part number of the old actuator too if those are needed --50dk509240. I also have another actuator very close to this one that may work. It is a M9204-CNC-2, which corresponds to carrier part 50dk509044.