White Rodgers 1F89 0211 Thermostat Els PW 17895 Service Friendly: Seal cap design Service Friendly: Seal cap design permits valve operation without cap removal High Thermal Stability: Engineered for high temp boiler environments without losing elasticity or sealing properties Set it to 'O' for the majority of heat pumps (energized in cooling) or to 'B' for specific brands like Rheem or Ruud that require the changeover relay to be energized in heating easy to navigate interface for end users
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White Rodgers 1F89-0211 Thermostat Els PW 17895 Service Friendly: Seal cap design