White Rodgers 1F87-251 manual

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Table of contents for the manual

  • Page 1

    Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage. Thermostat installation and all components of the sy[...]

  • Page 2

    2 INST ALLA TION REMOVE OLD THERMOSTAT 1. Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected. 2. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the [...]

  • Page 3

    3 RH Y 24 V AC 120 V AC Hot Neutral THERMOST A T SYSTEM G W Figure 5. T ypical wiring diagram for heat/cool, 5-wire, two-transf ormer systems HEA TING TRANSFORME R (Class II Current Limited) Heating System Fa n Relay Cooling System RC 24 V AC 120 V AC Hot Neutral COOLING TRANSFORMER (Class II Current Limited) O B RH Y 24 V AC 120 V AC Hot Neutral T[...]

  • Page 4

    4 Press HOLD to change to the next menu item or press TIME to go backwards to the previous item in the menu. To exit the menu and return to the program operation, press RUN. If no keys are pressed within fifteen minutes, the thermostat will revert to normal operation. 1) Select FA or SL (Fast or Slow) Heating Cycle Rate - The FA setting is frequent[...]

  • Page 5

    5 5) Select Compressor Lockout LOC OFF or ON - Selecting LOC ON will cause the thermostat to wait 5 minutes before turning on the compressor if the heating and cooling system loses power. It will also wait 5 minutes minimum between cooling cycles. This is intended to help protect the compres- sor from short cycling. Some newer compressors already h[...]

  • Page 6

    6 PROGRAMMING YOUR THERMOSTAT This section will help you plan your thermostat ’ s program to meet your needs. For maximum comfort and efficiency, keep the following guidelines in mind when planning your program. • When heating (cooling) your building, program the tem- peratures to be cooler (warmer) when the building is vacant or during periods[...]

  • Page 7

    7 5. Press PRGM once. The currently programmed start time and setpoint temperature for the Monday's 2nd heating program period will appear. 6. Repeat steps 3 and 4 to select the start time and heating temperature for Monday's 2nd heating program period. 7. Repeat steps 3 through 5 for the 3rd and 4th heating program periods. Monday heatin[...]

  • Page 8

    Symptom Possible Cause Corrective Action N o Heat/No Cool/No Fan 1. Blown fuse or tripped circuit breaker . Replace fuse or reset breaker . (common problems) 2. Furnace power switch to OFF . T urn switch to ON. 3. Furnace blower compartment door or Replace door panel in proper position to engage panel loose or not properly installed. safety interlo[...]