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Features

If the filter change reminder is enabled, you will see a reminder

 

in 

the display when your air filter needs changed.

 

The reminder will 

be shown in the display after your system has run long enough to 

require an air filter change.

Resetting The Filter Change Reminder: 

When the reminder is 

displayed, you should change your air filter and reset the reminder by 

holding down the 2nd button from the left side of the thermostat for 

3 seconds.

This thermostat also has other maintenance reminders (Humidity 

Pad, UV lamp, and IAQ Cell), that are reset with the same procedure.

Filter Change & Other Reminders

Features

Temporary Hold: 

The thermostat will display 

HOLD

 and 

RUN 

on the bottom of the screen when you press the            or         

key. If you do nothing, the temperature will remain at this setpoint 

temporarily for 4 hours. The program setpoint will then replace the 

temporary setpoint.

Permanent Hold:

 With a temporary hold set, If you press the 

HOLD

 

key at the bottom of your screen, you will see 

HOLD

 appear below 

the setpoint temperature in the display. The thermostat will now 

permanently stay at this setpoint and can be adjusted using the  

           or            keys.

To Return To Program: 

Press the 

RUN

 key at the bottom of the 

screen to exit temporary and permanent holds.

Temporary & Permanent Hold Feature

Specifications

The display range of temperature ... 41˚F to 95˚F (5˚C to 35˚C)

The control range of temperature.... 44˚F to 90˚F (7˚C to 32˚C)

Load Rating............................................... 1 amp per terminal, 1.5 amp 

                                                                      maximum all terminals combined

Swing (cycle rate or differential) ...... Heating is adjustable from 0.2˚ to 2.0˚

                                                                             Cooling is adjustable from 0.2˚ to 2.0˚

Power source ...........................................18 to 30 VAC, NEC Class II, 50/60 Hz 

                                                                      for hardwire

Operating ambient ............................... 32˚F to +105˚F (0˚C to +41˚C)

Operating humidity .............................. 90% non-condensing maximum

Dimensions of thermostat ................. 4.7” W x 4.3” H x 0.9” D

Frequency Range.....................................2.4 GHz ISM radio band

WIFI ..............................................................Supporting 802.11 B/G/N Standards

Specifications

WIFI

Summary of Contents for EWT-855i

Page 1: ...provided 3 Drywall anchors should be flush with the wall 4 Wires should be pushed into the wall Installation Tips The thermostat should be installed approximately 4 to 5 feet above the floor Select an area with average temperature and good air circulation Close to hot or cold air ducts That are in direct sunlight With an outside wall behind the thermostat In areas that do not require conditioning ...

Page 2: ... electrical shock or equipment damage Note In many heat pump systems with no emergency heat relay a jumper can be installed between E and W2 to turn thermostat into a single stage control for Emergency Heat Operation Thermostat Quick Reference Indicates the current room temperature Time and day of the week Staging Indicators Indicates stages of heat or cool running The compres sor delay feature is...

Page 3: ...or2H 1CHeatPumpSystem TypicalHeat OnlySystem TypicalHeatOnlySystemWithFan TypicalCool OnlySystem HEAT RELAY RC RH Y C W E G C R L2 L1 HOT FAN RELAY HEAT RELAY RC RH Y C W E G C R L2 L1 HOT FAN RELAY COMPRESSOR RELAY C R L2 L1 HOT RC RH Y C G Power supply Factory installed jumper Remove only when installing on 2 transformer systems Use either O or B terminals for changeover valve A24VACcommonconnec...

Page 4: ...rom OFF to 2000 hours of runtime in 50 hour increments Tech Setup Steps Room Temperature Calibration 0 F This feature allows the installer to select the minimum run time for the compressor For example a setting of 4 will force the compressor to run for at least 4 minutes every time the compressor turns on regardless of the room temperature You can set the minimum compressor run time to OFF 3 4 or ...

Page 5: ...ccupancy fan settings will energize the fan before the occupied time to provide ventilation prior to scheduled occupancy This feature only shows if the technician setup step for time periods is set to 2 Pre Occupancy Fan You can select the pre occupancy fan from OFF 1 2 or 3 hours If 1 2 or 3 is selected the fan will turn on that many hours prior to the scheduled occupied time period Tech Setup St...

Page 6: ... day s SLEEP time period To customize your 7 day Program schedule follow these steps Monday WAKE LEAVE RETURN or SLEEP Repeat steps 4 through 8 for the remaining days of the week A Note About Auto Changeover In Auto you have the ability to switch between Auto Heat or Auto Cool by pressing the system key This can be done once the current mode has reached its setpoint For example if in Auto Heat the...

Page 7: ... for any time period 1 Select HEAT or COOL with the SYSTEM key Note You have to program heat and cool each seperately 2 Press the MENU button If menu does not appear first press RUN 3 Press SCHED Note Monday is displayed and the OCCUPIED text is shown You are now programming the OCCUPIED time period for that day 4 Time is flashing Use the or key to make your time selection for that day s OCCUPIED ...

Page 8: ... replace the temporary setpoint Permanent Hold With a temporary hold set If you press the HOLD key at the bottom of your screen you will see HOLD appear below the setpoint temperature in the display The thermostat will now permanently stay at this setpoint and can be adjusted using the or keys To Return To Program Press the RUN key at the bottom of the screen to exit temporary and permanent holds ...

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