Description
Part #PCS043-720
OEM Part #004079
FUNCTION SWITCH (3 LEAD)
- 20A @ 125-250VAC, 50/60HZ, 1HP @ 125VAC; 2HP @ 250VAC
- Mounts to bracket in main valve assembly
View Locations On Main Valve Assembly
Pelton Crane OCR Plus Autoclave
Testing The Function Switch
The function switch is connected to the "Power On" Light, The "Heat On" Light and the Over Temperature Thermostat (which in turn leads to the Main Heating Element (Bottom Heating Element).
The Pelton Crane Function Switch responds to the turning of the Control Knob (the knob on the bottom marked: Fill/Sterilize/Vent/Off) When one of the positiions are selected with the control knob, the switch is turned either Off or On (like a light switch).
The Function Switch is located behind the bottom knob on the sterilizer. To Get to it for testing, you will have to remove the cabinet. Once the cabinet is removed you will notice three brown (or black) switches seemingly connected together. The switch closest to the rear of the sterilizer is the Function Switch (it has 2 spaded terminals on the bottom and one on top).
Indications of a faulty function switch would be problems with the temperature, and/or the "Power" Light, and/or the "Heat On" light
To test the Function Switch, you will need a volt/ohm meter and a standard screwdriver (to remove the cabinet)
WARNING; Before Proceeding, Turn The Unit Off & Unplug It From The Wall. Current Must Not Be Present When Performing This Test
Set Your Volt/Ohm Meter to 20k Ohms. This setting is in the range with the Omega Symbol 
In this test, it doesn't matter which color lead from your ohm meter you use to touch the terminals. If readings are any other than described below, the switch is faulty & needs to be replaced.
| Control Knob Positiion | Function Switch Setting | Valve Activated | Probe Placement | Reading |
| Off | Off | None | Terminals 1 & 3 | Digital Meter: 1 (Infinity)
Analog Meter: Infinity (Needle Stays To Left) |
| Off | Off | None | Terminals 1 & 2 | Digital Meter: 0
Analog Meter: 0 (Needle Goes All The Way To The Right) |
| Fill | On | Fill | Terminals 1 & 3 | Digital Meter: 0
Analog Meter: 0 (Needle Goes All The Way To The Right) |
| Fill | On | Fill | Terminals 1 & 2 | Digital Meter: 1
Analog Meter: Infinity (Needle Stays To Left)
|
| Sterilize | On | None | Terminals 1 & 3 | Diigital Meter: 0
Analog Meter: 0 (Needle Goes All The Way To The Right) |
| Sterilize | On | None | Terminals 1 & 2 | Diigital Meter: 1
Analog Meter: Infinity (Needle Stays To Left) |
| Vent | On | Vent | Terminals 1 & 3 | Diigital Meter: 0
Analog Meter: (Needle Goes All The Way To The Right) |
| Vent | On | Vent | Terminals 1 & 2 | Diigital Meter: 1
Analog Meter: Infinity (Needle Stays To Left) |
How The Pelton Crane OCR Plus Function Switch Works
The control knob opens and closes the fill and vent valves, in response to the operation selected and in turn, affects the state of the Function Switch.
Notice the long bar on the chamber side of the function switch and the button underneath it. The button is a push button. When the control knob is turned, the bar either depresses the button (turning it on) or releases it (turning it off)
