BASIC DESCRIPTION20 & 25 SERIES TEMPERATURE SWICHGAGE.20 series (2-1/16", 52mm mounting hole) and 25 series(2-11/16", 68mm mounting hole) have steel cases andare diaphragm actuated. The pointer/contact groundsthrough the case to complete the switch circuit. The limitcontact(s) is wired to power, through a Murphy MagneticSwitch. See diagrams for SWICHGAGEâ wire colorcode. Contacts are rated 2A @ 30V resistive (pilotduty); bulb adapter is 1/2 NPT. See installation andtypical wiring diagrams for wire up of SWICHGAGEâ andMurphy magnetic switch.A20 & A25 SERIES TEMPERATURE SWICHGAGEÒA20 series (2-1/16", 52mm mounting hole) and A25series (2-11/16", 68mm mounting hole) have Lexancases and are diaphragm actuated. These cases havemolded, isolated terminals for switch contact: thepointer-contact is wired to common or ground; the limit-contact(s) is wired to power through a Murphy magneticswitch. See SWICHGAGE diagrams for terminalcodes. Contacts 2A @ 30V resistive (pilot duty); bulbadapter is 1/2 NPT. See installation and typical wiringdiagrams on this sheet, for wire up of SWICHGAGEand Murphy magnetic switch.STANDARD ELECTRICAL DIAGRAMS: 20 & 25-TEMPERATURE SERIESTHESE DIAGRAMS ARE SHOWN WITH TEMPERATURE POINTER IN NORMAL OPERATING RANGE.STANDARD ELECTRICAL DIAGRAMS: A20 - TEMPERATURE SERIESTHESE DIAGRAMS ARE SHOWN WITH THE GAUGE POINTER IN THE NORMAL OPERATING RANGE.STANDARD ELECTRICAL DIAGRAMS: A-25 - TEMPERATURE SERIESTHESE DIAGRAMS ARE SHOWN WITH TEMPERATURE POINTER IN NORMAL OPERATING RANGE
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