Another OT problem only smaller
I've just started one project and now its lets keep dumping on the old guy. This one is a York M/N OT-D3-D3-C1-OJB. It is a 270 ton pony for a plant that has 2400 tons daytime. It had been offline for 3 months after a leak repair to evaporator shell were the oil line penetrates through to the oil cooler. After the repairs the chiller was way short of the 950#s of R-11 charge and the customer was extremely slow on deciding to pay for 400#s to trim the charge. That explains the 3 months downtime. The compressor is an LTH-85, the other units are all LTD-126's so there is no low pressure oil pump, high pressure oil pump, jet pump or auxiliary oil pump on this unit. Just one pump in a oil sump below the compressor. Several problems have developed. The oil heater is working 7.9 amps at 120 volts, goes off when compressor is started per design. The oil temp will drop from 135*F to 100*F within 5 minutes of starting and not come back up no matter how long it runs. The oil scavenger line seems like it is just bringing back refrigerant to the compressor housing and its dumping into the oil sump. It also has a vent solenoid on top of the compressor housing (equalizing line) to the vane inlet. I believe it is a N/O valve energized (closed) at start-up, then open after about 45 seconds through 1TR. Nowhere in the wire control diagram on the door does it show this vent sol. The 1TR timer show 4 micro switches in the wiring diagram, but in the part location diagram right next to it, there are only 3 micro switches. This is very puzzling to say the least. All the diagrams are the original from 1981. I have all the information on the LTD's style compressor, but none on the LTH. Does anyone out there have a pdf for the LTH series ? Thanks in advance-GEO
Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO