PENN Controls Products Catalog

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P47 Series Steam Pressure Limit Control Description The P47 Controls are available with single-pole, single-throw (SPST), double-pole, single-throw (DPST), or four-wire, two-circuit contacts for line voltage or low voltage. The pressure connector is 1/4 in. external NPT (0 to 15 psi only) or 1/4 in. internal NPT (for all other ranges). Refer to the P47 Series Steam Pressure Controls Product Bulletin (LIT-125450) for important product application information. Features • long-life contact structure with high contact force • easy-to-adjust single sight set scales show both cut-in and cut-out settings Applications P47 steam pressure controls are designed for high limit or operating control applications. A typical use is as a limit control on steam heating systems. Models that close on a pressure increase are used on steam unit heaters to avoid blower operation when steam pressure is below the point required for adequate heating. The P47 can be used with steam, water, air, or noncombustible gases that do not harm iron or copper. Figure 37: SPST Figure 38: Four-Wire, Two-Circuit Action on Pressure Rise Accessories The Part No. TBG16A-600 Siphon is supplied with all controls except models with 0 to 15 psi range. 129

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