For use with the following Class II systems:
DO NOT USE WITH:
Electrical Rating:
This thermostat is intended for use with a low voltage NEC Class II system. Do not use this thermostat with a line voltage system. If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air conditioning contractor or electrician. Do not exceed the specification ratings. All wiring must conform to local and national electrical codes and ordinances. This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.
CAUTION
To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.
WARNING
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 nonabsorbent 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. Refer to www.white-rodgers.com for location to send the product containing mercury.
The O/B switch on this thermostat is factory set to the “O” position. This will accommodate the majority of heat pump applications, which require the changeover relay to be energized in COOL. If the thermostat you are replacing or the heat pump installed with this thermostat requires a “B” terminal, to energize the changeover relay in HEAT, the O/B switch must be moved to the “B” position.
GAS / ELEC SWITCH
If your system is a heat pump, the GAS/ELEC Switch must be set to ELEC (see Fig. 1) If your system is a single stage, the switch must be set to GAS. The switch setting must agree with the system configuration selected in the configuration menu.
Two “AA” alkaline batteries are installed in your thermostat with a battery tag to prevent power drainage. Prior to use, open the battery door and remove the battery tag. To open, pull the battery door as shown by the arrow and lift open. The two “AA” batteries will operate all functions or maintain time and continuously display the temperature during a loss of AC power. To replace batteries, pull the battery door shown by the arrow and lift open. Using the polarity indicated inside the battery door, insert the batteries. To close the battery door, swing the door down while pulling in the direction of arrow. Once fully down, snap the door back into position. Thermostat can be powered by system AC power or Battery.
If
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 and switches (see fig. 5). Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, pull it straight out from the base. To replace the cover, line up the cover with the base and press until the cover snaps onto the base. The Thermostat Buttons and Switches
The configuration menu allows you to set certain thermostat operating characteristics to your system or personal requirements. To enter the menu: Set your thermostat to OFF
Menu Reference Number | Press Key | Displayed (Factory Default) | Press | Comments |
1 | SS | HP | Select Single Stage (SS) or Heat Pump (HP, 1 compressor) | |
2 | CS (OFF) | On | Select Cool Savings Feature On or OFF | |
CS (3) | 1, 2, 3, 4, 5, 6 | If CS selected On, selects Cool Savings value | ||
3 | CR Heat (ME) | FA, SL | Select Adjustable Anticipation, cycle rate, Heat Single Stage | |
4 | CR Cool (FA) | SL | Select Adjustable Anticipation, cycle rate, Cool Single Stage | |
5 | CL (OFF) | On | Select Compressor lockout OFF or On |
Menu Reference Number | Press Key | Displayed (Factory Default) | Press | Comments |
6 | L (On) | OFF | Select Display Light On or OFF | |
7 | Temp (0 HI) | 4 LO to 4 HI | Select temperature display adjustment higher or lower | |
8 | oF | oC | Select oF / oC Display (temperature units in Fahren- heit or Celsius) | |
9 | Change Filter (OFF) | On | Select filter replacement indicator OFF or On | |
Change Filter (200 h) | 25 to 1975 | If Change Filter selected On, selects time interval for Change Filter Indicator. (in 25 hour increments) | ||
10 | | Returns to normal operation |
If at any time during testing your system does not operate properly, contact a qualified service person.
Turn on power to the system.
Fan Operation
If your system does not have a G terminal connection, skip to Heating System.
Heating System
Cooling System
CAUTION
To prevent compressor and/or property damage, if the outdoor temperature is below 50oF, DO NOT operate the cooling system.
CAUTION
Do not allow the compressor to run unless the compressor oil heaters have been operational for 6 hours and the system has not been operational for at least 5 minutes.
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you may need to reset the thermostat. To reset, the System Switch must be in Cool or Heat. Simultaneously press
Symptom | Possible Cause | Corrective Action |
No Heat/No Cool/No Fan common problems) | 1. Blown fuse or tripped circuit breaker. 2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel loose or not properly installed. | Replace fuse or reset breaker. Turn switch to ON. Replace door panel in proper position to engage safety interlock or door switch. |
No Heat | 1. System Switch not set to Heat.
2. Loos connection to thermostat or system 3. Heating System requires service or thermostat requires replacement. | Set System Switch to Heat and raise setpoint above room temperature. Verify thermostat and system wires are securely at- tached. Diagnostic: Set System Switch to Heat and raise the set- point above room temperature. Within a five minutes the thermostat should make a soft slick 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 the furnace manufacturer or a service per- son to verify the heating system 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 thermostat requires replacement | Set System Switch to Cool and lower setpoint below room temperature. Verify thermostat and system wires are securely at- tached. Same procedures 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 if the compressor lock-out option is selected in the configura- tion menu (Item 5). |
Heat, Cool or Fan Runs Constantly | 1. Possible short in 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 the thermostat as de- scribed below. 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 Cooling Cycles Too Fast or Too Slow (narrow or wide temperature swing) | 1. The location of the thermostat and/or the size of the Heating or Cooling System may be influencing the cycle rate. | Item 3 (CR Heat) or 4 (CR Cool) in the Configuration Menu is the adjustment that controls the cycle rate. If an acceptable cycle rate is not achieved using the FA (Fast) or SL (Slow) adjustment contact a local service person for additional suggestions. |
Thermostat Setting and Thermometer Disagree | 1. Thermostat thermometer setting requires adjustment. | The thermometer can be adjusted +/- degrees as listed in item 7 of the Configuration Menu. No other adjustment is possible. |
Blank Display and/or Keypad Not Responding | 1. Voltage Spike or Static Discharge. | If a voltage spike or static discharge occurs use the Reset Operation listed above. |
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