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Repeat steps 4 through 7 for the Saturday 

OCCUPIED 

time period 

and for the Saturday 

UNOCCUPIED

 time period.

Saturday:

Repeat steps 4 through 7 for the Sunday 

OCCUPIED 

time period and 

for the Sunday 

UNOCCUPIED

 time period.

Sunday:

Programming

Features

If   appears in the display, then the keypad is locked.  All or some of 

the keys will not work. Hold the             and             keys for 3 seconds to 

remove the lock. Use the same procedure to lock the display

Keypad Lockout Note:

Temporary Hold: 

The thermostat will display 

HOLD

 and 

RUN SCHED 

on the bottom of your screen when you press the            or         

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

temporarily for 4 hours. After this, the program setpoint will then 

replace your 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 SCHED

 key at the bottom of 

your screen to exit temporary and permanent holds.

Temporary & Permanent Hold Feature

To customize your 7 day Program schedule, repeat 

steps 4 through 8 for the Tuesday, Wednesday, 

Thursday, Friday, Saturday and Sunday.

A Note About Programmable Fan:

The programmable fan feature will run the fan continuously during 

during any time period when it is programmed to be on. This is the best 

way to keep the air circulated and to eliminate hot and cold spots in your 

building. If using 

IAQ

 mode, set fan to IAQ for any time period.

Summary of Contents for CT855S

Page 1: ...Operation Manual Operation Manual ...

Page 2: ...ntents Thermostat Operation Thermostat Quick Reference Programming Features Warranty Information Page 2 3 4 7 8 12 1 Una version en español de este manual se puede descargar en la pagina web de la compañia Equipment damage hazard Do not operate the cooling system if the outdoor temperature is below 50 F 10 C to prevent possible compressor damage Caution Rev 1809 13 14 15 P O Box 3377 Springfield M...

Page 3: ... continuously The AUTO setting will cycle the fan on only when the heating or cooling system is on IAQ will enable IAQ FAN MODE if programmed Selects the operation mode on your HVAC system Selecting HEAT turns on the heat mode Selecting COOL turns on the cool mode Selecting OFF turns both heating and cooling off Selecting AUTO will turn the HEAT or COOL on as needed EM HEAT will appear as an optio...

Page 4: ... either of these it will hold for 4 hours then return to either 55 F or 85 F After day 63 the batteries must be replaced immediately to avoid freezing or overheating because the thermostat will shut the unit off until the batteries are changed Important Battery Door Information When the battery icon appears replace your AA batteries immediately Failure to do so may result in your heating cooling s...

Page 5: ...ayed when the thermostat program is permanently overridden System Operation Indicators If these or the Fan indicator are flashing it means that they are in a delay of some type compressor delay cooling fan delay staging delay 1 2 3 7 9 Low Battery Indicator Replace batteries when this indicator is shown Program Menu Options Show different options during programming Program Time Periods Residential...

Page 6: ...C1 time period Note If you want the fan to run continuously during this time period select ON with the FAN key If you want to use IAQ mode during this time period select IAQ with the fan key 5 Press NEXT STEP 6 The setpoint temperature is flashing Use the or key to make your setpoint selection for that day s WAKE OCC1 period 7 Press NEXT STEP 8 Repeat steps 4 through 7 for that day s LEAVE UNOCC1 ...

Page 7: ...ogram schedule follow these steps Weekday OCCUPIED UNOCCUPIED Programming Programming Repeat steps 4 through 7 for the Saturday WAKE OCC1 time period for the Saturday LEAVE UNOCC1 time period for the Saturday RETURN OCC2 time period and for the Saturday SLEEP UNOCC2 time period Saturday Repeat steps 4 through 7 for the Sunday WAKE OCC1 time period for the Sunday LEAVE UNOCC1 time period for the Su...

Page 8: ...int will then replace your 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 SCHED key at the bottom of your screen to exit temporary...

Page 9: ...gistration Complete form and mail to Thermostat Warranty Registration Online Mail Filter Change Other Reminders This thermostat also has other maintenance reminders Humidity Pad UV lamp and IAQ Cell that are reset with the same procedure Features If your HVAC contractor has configured the thermostat to remind you when the air filter needs changed you will see a reminder in the display when your ai...

Page 10: ...www pro1iaq com Cut Out For Warranty Registration ...

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