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== Heatpump ==The reversing valve wire for cooling is typically orange (but is occasionally blue) and labelled O or R. This connects to the O terminal. Your thermostat may also have the reversing valve wire for heating, labelled B, which should be connected to the B terminal. If you don't have this wire, cap the terminal with a wire nut. The fan control relay wire is typically green and labelled F or G, and should be connected to the G terminal.The second stage models cooling circuit wires are typically blue and labelled Y2. The hearing wires are usually pink and labelled W1, W2, or W-U. These must be connected to their terminals.COMMON HEATPUMP BRANDSThese systems are more common and power the reversing valve in A/C mode. (O Terminal)Orange is the OG reverse valve To Jumpstart the A/C connect RED the voltage to GREEN, YELLOW, and ORANGE* Green for the fan, Yellow for the Compressor, and Orange for the OC reversing valve.To Jumpstart the Heat connect RED the voltage to GREEN and YELLOW* The heat pump is operating for heat modeIF IT IS A '''RUUD OR RHEEM''' SYSTEMThese systems power the reversing valve in heat mode (E Terminal)To Jumpstart the A/C connect RED the voltage to GREEN, and YELLOW* Green for the fan, Yellow for the Compressor, and Orange for the OC reversing valve.To Jumpstart the Heat connect RED the voltage to GREEN, YELLOW and ORANGE* The heat pump is operating for heat modeWiring Example for Thermostat for a single stage heat pump with aux backup emergency heat* one stage heat* one stage cool* backup emergency heat C = common = black wire Rc and R = cooling power, heating power = red wire O/B = Change over valve aka reverse valve = orange wire Y = compressor stage 1 = yellow wire G = fan relay = green wire AUX-E = Backup Heat/ Emergency Heat = white wire Additional: S1 = outdoor sensor = gray S1 = outdoor sensor = pink== Two Stage Gas ==W – When you see a W terminal, it just means heat. Usually, you will only see W when the control only has one stage of heat.W1 – Means first-stage heat.W2 – Means second-stage heat.R (usually the red wire) is the power supply (24v). G (usually green) controls the fan.== Heat Anticipator ==Mechanical thermostats like the Honeywell "The Round" have an adjustable heat anticipator while digital thermostats do not have heat anticipators. The function of the heat anticipator is to fine-tune the point at which the thermostat turns off the furnace burners.Properly adjusted a heat anticipator also prevents the room from getting warmer than the thermostat set temperature, and it prevents the heat from shutting off before the room has reached the thermostat set temperature. Adjusting the anticipator up or down to higher or lower Amps numbers will lengthen or shorten the heat-on or cooling-on cycle. The heat anticipator essentially consists of a small disc attached to the bimetallic coil of the thermostat. The disc has a thin wire on its surface and an adjustable arm that touches the wire. The position of the arm determines the electrical resistance of the wire, which in turn affects how hot the wire gets. As the wire heats up, it warms the bimetallic coil, which in turn shuts down the gas burners early, according to the heat anticipator's setting.When the heat anticipator in your thermostat is out of adjustment, it can cause the furnace to "'''short-cycle'''" (turn on and off frequently) or to exceed or never reach the desired thermostat heat setting. Fortunately, this problem is often easy to correct by adjusting the heat anticipator or replacing an old thermostat. Adjustment: If the furnace is cycling on and off too frequently, move the heat anticipator adjustment lever closer to the "LONGER" setting and if the furnace is exceeding or never reaching the desired set temperature, then move the adjustment lever away from the "LONGER". * The highest (1.2A) position gives the longest heat-on cycle. (max value dependent on model)* The 0.1A position gives the shortest heat-on cycle in thermostat heat* Honeywell warns to never set the T87F series heat anticipator below 0.3A.Honeywell Thermostat Heat Anticipator Settings: Honeywell specifies the following amp settings for their CT87 thermostats, based on the heating system type:* 1.2 - Steam* 0.8 - Hot Water heat* 0.8 High Efficiency Hot Air* 0.4 Standard Hot Air* 0.3 Electric HeatThe anticipator was replaced by a thermistor in newer designs. Electronic thermostats do not use a physical anticipator due to the microprocessor controlled temperature and delay in shut off. In a mechanical thermostat which has no microprocessor, clock, or timer the heat anticipator's purpose is to reduce the temperature swing caused by the system, and to increase overall efficiency. It does so by creating false heat, which increases the thermostat's rate of response.Defective Anticipator: If the heat anticipator is malfunctioning, your furnace will short cycle and the room temperature will not reach the temperature displayed on the thermostat. Typical lifespan or the anticipator and mechanical thermostat is approximately ten years.== resources ==* https://learnmetrics.com/thermostat-wiring/