Assemble tools required below.
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage2
CAUTION
To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete.
Before removing wires from the old thermostat’s switching subbase, label each wire with the terminal designation it was removed from.
ATTENTION! This product does not contain mercury. However, this product may replace a unit that contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury and place into a container that can be sealed. If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container.
Refer to www.white-rodgers.com for locations to send products containing mercury.
ATTENTION! This product does not contain mercury. However, this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container and return to White-Rodgers at 2895 Harrison Street, Batesville, AR 72501-2117 for proper disposal.
WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazards.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage the thermostat and could cause personal injury and/or property damage.
Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.
Electric Heat or Single-Stage Heat Pump Systems
This thermostat is configured from the factory to operate a heat/cool, fossil fuel (gas, oil, etc.), forced air system. It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat. If your system is an electric or heat-pump system that REQUIRES the thermostat to turn on the fan on a call for heat, locate the GAS/ELECTRIC switch (see fig. 1) and switch it to the ELECTRIC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if the heating/cooling system requires the thermostat to control the fan, contact a qualified heating and air conditioning service person.
Hydronic (Hot Water or Steam) Heating Systems
This thermostat is set to operate properly with a forced-air heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system.
The factory default setting is forced air heat. Clipping jumper W905 on the circuit board will produce a longer heating cycle which is normally for hot water or steam (hydronic) systems. Both settings produce a very accurate temperature control and can be set to your personal preference. As received, the thermostat cycles the system just under 1°F. With W905 clipped, the system cycles at approximately 1.5°F.
CAUTION
Take care when securing and routing wires so they do not short to adjacent terminals or rear of the thermostat. Personal injury and/or property damage may occur.
Attach Thermostat Base to Wall
Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate. If
NOTE
To prevent static discharge problems, touch side of the thermo-stat to release static build-up before touching any keys.
If at any time during testing your system does not operate properly, contact a qualified service person.
If your system does not have a G terminal connection, skip to Heating System.
CAUTION
To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.
This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize. If the temperature is adjusted to call for cool within 5 minutes of the last cycle the snowflake icon will blink indicating the thermostat is locked out. After 3 to 5 minutes, the compressor will start and the snowflake icon will stop flashing. This helps prevent the compressor from cycling too quickly and is a normal operation for the thermostat.
Before you begin using your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, gently pull it straight out from the base. To replace the cover, line up the cover with the base and press gently until the cover snaps onto the base.
Before you begin using your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, gently pull it straight out from the base. To replace the cover, line up the cover with the base and press gently until the cover snaps onto the base.
The Thermostat Buttons and Switches
Now that you are familiar with the thermostat buttons and display, read the following information to learn about the many features of the thermostat.
Electrical Rating:
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by pressing
Batteries
For best results, replace batteries once a year with new premium brand alkaline batteries such as Duracell® or Energizer®.
Symptom | Possible Cause | Corrective Action |
Heat, Cool or Fan Runs Constantly. | 1. Blown fuse or tripped circuit breaker.2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel lose or not properly installed. | Replace fuse or reset the breaker. Turn the switch to ON.Replace the door panel in a proper position to engage the safety interlock or door switch. |
No Heat | 1. Pilot light not lit.2. SYSTEM Switch not set to HEAT. 3. Loose connection to thermostat or system. 4. Furnace Lock-Out Condition. Heat may also be intermittent. | Re-light pilot.Set SYSTEM Switch to HEAT and raise setpoint temperature above room temperature. Verify thermostat and system wires are securely attached. Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance. |
Symptom | Possible Cause | Corrective Action |
No Heat (continued) | 1. Heating system requires service or the raise thermostat requires replacement. | Diagnostic: Set the SYSTEM Switch to HEAT and the setpoint above room temperature. Within a few seconds, the thermostat should make a soft-click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed above. If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact thefurnace manufacturer or a service person to verify the heating is operating correctly. |
No Cool | 1. SYSTEM Switch not set to COOL.2. Loose connection to thermostat or system. 3. Cooling system requires service or the thermostat requires replacement. | Set SYSTEM Switch to COOL and lower setpoint temperature below room temperature.Verify thermostat and system wires are securely attached. Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five-minute delay before the thermostat clicks in Cooling. |
Heat, Cool or Fan Runs Constantly. | 1. Possible short in the wiring.2. Possible short in thermostat. 3. Possible short in heat/cool/fan system. 4. FAN Switch set to Fan ON. | Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal screws. Try resetting thethermostat as described above. If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat. |
Furnace Cycles Too Fast or Too Slow (narrow or wide temperature swing) | 1. The location of the thermostat and/or the size of the Heating System may be influencing the cycle rate. | Digital thermostats normally provide precise temperature control and may cycle faster than some older mechanical models. A faster cycle rate means the unit turns on and off more frequently but runs for a shorter time so there is no increase in energy use. If you would like to increase the cycle time, clip Jumper W-905 as mentioned in the instructions for HydronicHeating Systems. It is not possible to shorten the cycle time. If an acceptable cycle rate is not achieved as received or by clipping W-905 contact a local service person for additional suggestions. |
Cooling Cycles Too Fast or Too Slow (narrow or wide temperature swing) | 1. The location of the thermostat and the size of the Cooling System can influence the cycle rate. | The cycle rate for cooling is fixed and can not be adjusted. Contact a local service person for suggestions. |
Thermostat Setting and Thermostat Thermometer Disagree | 1. Thermostat thermometer setting requires adjustment. | The thermometer can be adjusted +/- 3 degrees. See Temperature Display Adjustment in the Operation section. |
The thermostat Does Not Follow the Program | 1. AM or PM set incorrectly in the program.2. AM or PM set incorrectly on the clock. 3. Voltage spike or static discharge. | Check the current clock and program settings including the AM or PM designations for each time period. If a voltage spike or a static discharge occurs use the Reset Operation listed above. |
Blank Display and/or Keypad Not Responding | 1. Voltage spike or static discharge.2. Battery change required. | Replace batteries and check heat/cool system for proper operation. If a voltage spike occurs use the Reset Operation listed above. |
HOMEOWNER HELPLINE: 1-800-284-2925
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