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SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
0 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range: 32°F to 105°F
Operating Humidity Range: 0 to 90% RH (non-condensirtg)
Shipping Temperature Range: -40°F to 150°F
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermo¬
stat by pressing
and
'ZE?
at the same time while moving
the SYSTEM switch from OFF to HEAT. This also resets the
factory defaults. If the thermostat has power, has been reset
and still does not function correctly contact your heating/cooling
service person or place of purchase.
Batteries
For optimum performance, we recommend.replacing batteries
once a year with fresh "AAA" Energizer alkaline batteries.
Symptom
Possible Cause
Corrective Action
No Heat
(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 Lise or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or door switch.
No Heat
1. Pilot light not lit.
Re-light pilot.
3. Loose connection to thermosiat or system.
4.
Furnace Lock-Out Condition. Heat may also .
be intermittent.
5. Heating system requires service or
thermostat requires replacement.
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.
Diagonisiic: Set SYSTEM Switch to HEAT and raise the setpoint above room
temperature. Within a few seconds the thermostat should make a soft did
sound. This sound usually indicates the thermostat is operating property, if the
thermostat does not ciick, try the reset operation listed above. If the thermostat
does not dick 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 person to verify the heating is operating
correctly.
Heat, Runs
Constantly
1. Possible short in wiring.
2. Possible short in thermostat
3. Possible short in heat system.
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 described above, if the condition persists the manufacturer of your
system or service person can instruct you on how to test the Heat 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 fester 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, dip
jumper W-905 as mentioned in the instructions for Hydronic Heating 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.
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.
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.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
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