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Since I oversaw the rebuilding of a Thermal Vacuum Evaporator system, I wanted to write down those process to keep documents for others.
We order Varian DP Thermal Overload Switch: VA-KLIXON-300(300F or 147C) for VHS-6 from: DUNIWAY STOCKROOM. This company has almost everything for your vacuum system, but the min order for each purchase is $25. This thermal switch costs $75 so we meet the purchase of min purchase.
Before we start the replacing process, we need to have some background knowledge of this component. The following statement is from: Ideal. http://www.idealvac.com/files/brochures/VHS-4-6-250a.pdf
The thermal switch is used to protect the diffusion pump from over heating which typically occurs from lack of cooling water. This switch is located in a box near the bottom of the pump and provides protection to the pump in the event of excessive fluid loss, the loss of cooling water, or high inlet pressure. The thermal switch is connected in series with the heater. In the event of over-temperature, the thermal switch will open and shut off the power to the pump.
When replacing the thermal switch of the diffusion pump, the box near the bottom of the pump has to be unscrewed. Taking out the old thermal switch, and put a new one on the diffusion pump. Using two screws to secure the thermal switch on position, and then the electrical wire of the diffusion pump is pulled through the hole of the box. Now the electrical connector can be connected to the thermal switch. Since the diffusion pump is using Alternating current (AC), the wire can be connected to one of the pin on the thermal switch. There is a wrong demo photo below, which the wire does not pull through the box.
After the wires are connected to the switch, the box can be put back to cover the switch. There are two screws needed to put on the box for fix the box to protect the switch.
We order Varian DP Thermal Overload Switch: VA-KLIXON-300(300F or 147C) for VHS-6 from: DUNIWAY STOCKROOM. This company has almost everything for your vacuum system, but the min order for each purchase is $25. This thermal switch costs $75 so we meet the purchase of min purchase.
Before we start the replacing process, we need to have some background knowledge of this component. The following statement is from: Ideal. http://www.idealvac.com/files/brochures/VHS-4-6-250a.pdf
The thermal switch is used to protect the diffusion pump from over heating which typically occurs from lack of cooling water. This switch is located in a box near the bottom of the pump and provides protection to the pump in the event of excessive fluid loss, the loss of cooling water, or high inlet pressure. The thermal switch is connected in series with the heater. In the event of over-temperature, the thermal switch will open and shut off the power to the pump.
When replacing the thermal switch of the diffusion pump, the box near the bottom of the pump has to be unscrewed. Taking out the old thermal switch, and put a new one on the diffusion pump. Using two screws to secure the thermal switch on position, and then the electrical wire of the diffusion pump is pulled through the hole of the box. Now the electrical connector can be connected to the thermal switch. Since the diffusion pump is using Alternating current (AC), the wire can be connected to one of the pin on the thermal switch. There is a wrong demo photo below, which the wire does not pull through the box.
After the wires are connected to the switch, the box can be put back to cover the switch. There are two screws needed to put on the box for fix the box to protect the switch.
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