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honeywellL641A1039cylinder statNext Day |
| Honeywell L641A1039 Cylinder Thermostat. The L641 is a surface contact thermostat designed to sense the water temperature in storage cylinders, and to provide temperature control, temperature limiting, and temperature feedback functions. L641A mounts directly onto domestic hot water cylinders and can be wired to directly switch a wet central heating circulating pump, or boiler, or to operate spring return and motor open/motor close zone valves.
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