7.The Start Time for Occupied 1 will be displayed. Use the UP ARROW and DOWN ARROW buttons to raise or lower the time until the desired Start Time is shown. Press the Mode button to continue. See Fig. 6.

Fig. 6 — Start Time Display

8.The Stop Time for Occupied 1 will be displayed. Use the UP ARROW and DOWN ARROW buttons to raise or lower the time until the desired Stop Time is shown. Press the Mode button.

9.The On/Off icon will be displayed. Use the UP ARROW to turn the Occupied 1 period ON for this day. Use the DOWN ARROW to turn the Occupied 1 period OFF for this day.

10.Repeat Steps 2 through 9 to program the remaining schedule for occupied periods 2 and 3 (if selected in Step 1).

11.The Copy command can be used to copy the previous day’s schedule if the schedules are the same. The copy command becomes available after all the occupied peri- ods are programmed in a day. Use the UP ARROW to change the copy command to YES. Use the DOWN ARROW to change the copy command to NO. Press the Mode button when the choice has been made. See Fig. 7.

If NO was selected, the schedule will automatically change to the next day and the user must enter the occu- pied and unoccupied schedules for that day.

NOTE: Occupied 1 schedule heating and cooling set points are the same for each day. Occupied 2 and 3 set points may be set to different values for each day of the week.

If YES was selected, the schedule will be copied to the next day. The schedule copy may be repeated until Sun- day is reached. The Sunday schedule cannot be copied to Monday.

12.After all the times and set points for each day have been entered, press the Program button to finish entering the schedule.

Fig. 7 — Copy Command Display

NOTE: The thermostat will continue to follow the sched- ule until a new one is entered.

•If only one occupied schedule is selected, the Occupied 2 and 3 schedules are skipped.

•If the start time is set later in the day than the stop time, the program will run from midnight of that day to the stop time and then from the start time to midnight.

•If the same start and stop times are programmed for an occupancy schedule, the thermostat will be in Occupied mode for 24 hours.

•If one occupied period starts or stops within another occupied period, the lower numbered schedule has pri- ority. For example, if schedule Occupied 3 is running for 24 hours and occupied schedule 2 comes on from 1 to 3 PM, the set points from Occupied 2 are in effect from 1 to 3 PM.

OVERRIDING THE SCHEDULE — The schedule can be overridden during operation by pressing the UP or DOWN ARROW buttons to change the desired temperature. The ther- mostat will use the new set point until the next scheduled time period starts.

OPERATION

The Mode button selects the operating mode of the thermo- stat. If OFF is selected, the thermostat will not enter Heating or Cooling mode. If HEAT is selected, the thermostat will only enter Heating mode (if the room temperature is below the heat- ing set point). If COOL is selected, the thermostat will only en- ter Cooling mode (if the room temperature is above the cooling set point). If AUTO is selected, the thermostat will enter Heat- ing or Cooling mode based on the room temperature and the heating and cooling set points. If PROGRAM ON is selected, the stored schedule is enabled and the thermostat will follow the Occupied and Unoccupied schedules stored in its memory.

Auto-Changeover — When the thermostat mode is set to AUTO, the thermostat will provide automatic changeover from Heating to Cooling mode and Cooling to Heating mode when required. The thermostat will automatically switch to maintain the desired temperature setting. The thermostat does not need to be manually changed from heating to cooling or cooling to heating operation.

Light-Activated Operation — A light sensor is pro- vided on the thermostat for light activation. The thermostat must be in Program On mode for light activation to be initiated. When the sensor detects light (the space is occupied), the ther- mostat will enter into Occupied 1 mode and heat or cool ac- cording to the Occupied 1 set points. If the room is dark, the thermostat will follow its programmed schedule.

NOTE: Light activation does not work in Holiday mode.

Two-Stage Operation — The second stage of heat or cool is turned on when the first stage has been on for a mini- mum of 2 minutes and the temperature differential from the set point is equal to or greater than the set point plus the deadband plus 2 degrees.

Clock Backup — In the event of a power loss, the ther- mostat will keep time for a minimum of 48 hours without ex- ternal power or batteries.

Fan Operation — If Fan On is selected, the fan will run continuously during occupied schedule (except when Mode is switched to OFF). The fan will be off during unoccupied schedule except during heating or cooling operation.

If Fan On is not selected, the fan will only operate during heating or cooling operation.

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Carrier 50QE900 owner manual Operation, Start Time Display
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50QE900 specifications

The Carrier 50QE900 is an advanced air conditioning unit designed to provide superior climate control for residential and light commercial buildings. This model is a part of Carrier’s renowned range of HVAC solutions, known for efficiency and reliability. With its innovative technology and user-friendly features, the 50QE900 ensures optimal comfort year-round.

One of the standout features of the Carrier 50QE900 is its high efficiency. This unit boasts an impressive SEER (Seasonal Energy Efficiency Ratio) rating, which signifies its energy-saving capabilities. The greater the SEER, the more efficient the unit is at cooling your space while keeping electricity costs low. This model utilizes environmentally friendly refrigerants, aligning with modern sustainability goals.

In terms of design, the Carrier 50QE900 is compact and sleek, making it suitable for various installations without compromising on aesthetics. The robust construction ensures durability, allowing it to withstand varying weather conditions while maintaining consistent performance.

The 50QE900 incorporates advanced technological features that enhance functionality and user experience. It is equipped with a smart thermostat that allows for easy temperature adjustments and scheduling through a mobile app. This connectivity fosters a responsive climate control experience, permitting users to monitor and tweak indoor conditions even when they are away from home.

Furthermore, the unit is also recognized for its quiet operation. With sound-dampening technology, the Carrier 50QE900 minimizes noise levels, creating a peaceful indoor environment. This quality is particularly beneficial for residential applications where noise sensitivity may be a concern.

Maintenance is also simplified with the Carrier 50QE900. The unit features accessible filters and components, making routine upkeep straightforward. Regular maintenance helps ensure that the unit operates efficiently over time, prolonging its lifespan and performance.

In summary, the Carrier 50QE900 combines efficiency, innovative technology, and user-friendly features into a reliable air conditioning solution. With its energy-saving performance, sleek design, and quiet operation, it stands out as a prime choice for those seeking effective climate control in a range of environments. As industries shift towards smarter and more efficient solutions, the Carrier 50QE900 remains a compelling option for modern comfort needs.
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