Carrier 50QE900-250FS User Manual

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Fig. 1 — Thermostat Display

Aquazone™ Water Source Heat Pump

Commercial Programmable Thermostat

Owner’s Manual

Part Number 50QE900-250FS

50QE900

Flush-Mounted Flatstat

IMPORTANT: Read entire instructions before programming the thermostat.

CONTENTS

Page

GENERAL CONFIGURATION

Thermostat Display Heat or Cool Indicator Thermostat Front Panel Buttons Keypad Lock Set Clock Program Thermostat Schedules

OPERATION Auto-Changeover Two-Stage Operation Clock Backup Fan Operation Emergency Heat Holiday Mode Dry Contact Switch Remote Temperature Sensor

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GENERAL

Carrier’s Aquazone 7-day, commercial, programmable thermostats are flat, wall-mounted, low-voltage thermostats whi ch maintain room temperature by controlling the operation of an HVAC (heating, cooling and ventilation) system. Separate heating and cooling set points and auto-changeover capability allow occupied and unoccupied programming schedules for energy savings.

All thermostats allow up to 3 occupied and one unoccupied time/temperature settings to be programmed per 24-hour period. Each thermostat stores programs for 7 independent days. Batteries are not required. During power interruption the i nte rnal NEVERLOST™ memory stores programmed schedules for an unlimited time.

CONFIGURATION

Thermostat Display —

ed in the center of the thermostat. See Fig. 1. The following information can be displayed on the screen:

• mode (OFF, HEAT , COOL, AUTO, or PROGRAM ON)

• fan setting (FAN ON or blank)

• override indication

• room temperature

• desired temperature

• service filter indicator

• time of day

• day of the week

• schedule period (Occupied 1, 2, or 3; or Unoccupied)

• setup indicator (Programming mode)

• lock indicator

• start/stop indicator (schedule period Programming mode)

Heat or Cool Indicator —

located in the middle of the thermostat. See Fig. 2. The light will be red if the thermostat is in Heati ng mode. The l ight will be green if the thermostat is in Cooling mode.

Thermostat Front Panel Buttons —

has buttons on the front cover which are used to raise or lower the desired set point, change the mode, program, and override the current program. See Fig. 2.

SET POINT BUTTONS — The UP ARROW and DOWN ARROW buttons will raise or lower the current desired temperature set point. If the thermostat is in AUTO mode, pressing the UP ARROW or DOWN ARROW buttons will adjust both the heating and cooling set points. Pressing the UP ARROW or DOWN ARROW buttons in Cooling mode will adjust only the

The thermostat display is locat-

A Heat or Cool indicator is

The thermostat

IMPORTANT: The thermostat has a configurable security level. If certain functions are not ava il able (changing set points, changing programming schedules), the thermostat security level may be configured to exclude those functions. Call the installer to reconfigure the security level.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4 Ta b 5 a 5 a

PC 111 Catalog No. 535-00111 Printed in U.S.A. Form 50QE-4SO Pg 1 6-03 Replaces: New

BACKLIT

Fig. 3 — Setting Occupied 1 Set Points

LCD DISPLAY

HEAT OR COOL INDICATOR

MODE BUTTON

OVERRIDE BUTTON

TEMPERATURE SENSOR

(RED=HEAT, GREEN=COOL)

UP AND DOWN BUTTONS

Fig. 2 — Thermostat Front Panel

cooling set points. Pressing the UP ARROW or DOWN ARROW buttons in Heating mode will adjust only the heating set points. The UP ARROW and DOWN ARROW buttons are also used in Programming mode.

OVERRIDE BUTTON — The Override button is used to force the thermostat from Unoccupied mode into the Occupied 1 mode comfort settings. The Override period will be set at 30 minutes. The thermostat will then return t o Unoccupied mode. To increase the amount of time in Override mode, press the Override button again. Thirty minutes of override time will be added for each time the Override button is pressed up to a maximum of 4 hours. After the 4-hour limit has been reache d, press the Override button again to cancel Override mode.

While in Override mode, the Override icon and the Occupied 1 icon will be displayed on the thermostat. The time of day and the minutes remaining in Override mode will alternate on the thermostat display.

The set points are adjustable with the UP ARROW and DOWN ARROW keys during Override mode.

NOTE: If the thermostat is in Occupied mode and the Override button is pressed, the thermostat will go into Unoccupied mode immediately. The thermostat will remain in Unoccupied mode until the next Occupied start time.

MODE BUT TON — The Mode button selects t he operating mode of the thermostat.

• If OFF is selected, the thermostat will not enter Heating

or Cooling m ode.

• If HEAT is selected, the thermostat will only enter Heat-

ing mode (if the room temperature is below the heating set point). The thermostat will not provide cooling.

• If COOL is selected, the thermostat will only enter Cool-

ing mode (if the room temperature is above the cooling set point). The thermostat will not provide heating.

• If AUTO is selected, the thermostat will enter Heating or

Cooling mode based on the room temperature and the heating and cooling set points. 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 or cooling or cooling to heating operation.

• If PROGRAM ON is selected, your daily schedule is enabled and the thermostat will follow the programmed daily schedule stored in its memory.

Keypad Lock —

To prevent unauthorized use of the thermostat, the front panel buttons can be disabled. To disable or lock the keypad, press and hold the Mode button. While holding down the Mode button, press the UP and DOWN ARROW buttons simultaneously. The “Locked” icon will appear on the display .

The thermostat is unlocked by performing the sam e procedure. Press and hold the Mode button. While holding down the Mode button, Press the UP and DOWN ARROW buttons simultaneously. The “Locked” icon will be removed from the display .

Set Clock —

The Set Clock function allows the user to change the time and day displayed on the thermostat. Press and hold the Mode and Override buttons at the same time until the display changes. The display will show the setup annunciator. The current time will blink on and off. Press the UP ARROW and DOWN ARROW buttons until the correct time is shown. Hold down the buttons to quickly move through the time display. The A M and PM annunciators will automatically change. To scroll through by hours instead of minutes, hold down the Override button while pressing UP ARROW or DOWN ARROW. To ensure the schedules are properly followed, make sure that AM or PM is correct for the time chosen. When the correct time is shown, press the Mode button to modify the day of the week. The current day will blink on and off. Press t he UP ARROW and DOWN ARROW buttons until the correct day is shown. Press and hold the Mode and Override buttons at the same time again to exit the Set Clock mode.

Program Thermostat Schedules —

Before programming the thermostat, plan the thermostat daily schedule. The schedule is divided into 7 days (Monday through Sunday). Each day has from 2 to 4 time periods (Occupied 1, Occupied 2, Occupied 3, Unoccupied) depending on t he configuration of the thermostat. Each occupied time period has a start time, stop time, heating set point, and cooling set point. The unoccupied time period has a heating set point and a cooling set point. The unoccupied time period is active when ever an occupied time period is not active. Fill in Table 1 as an aid to programming the daily schedules.

PROGRAMMING MODE — To program the daily schedules, perform the following procedure:

1. Enter Programming mode by pressing and holding the Mode and UP ARROW buttons. The Occupied 1 annunciator will appear on the thermostat display. Use the UP ARROW and DOWN ARROW buttons to set the maximum number of Occupied periods for each day. The thermostat can be set to 1, 2, or 3. After the number of Occupied periods has been selected, press the Mode butt on. See Fig. 3.

2. The cooling set point for Occupied 1 will be displayed.

Fig. 4 — Start Time Display

Fig. 5 — Copy Command Display

Use the UP ARROW and DOWN ARROW buttons to raise or lower the cooling set point until the desired temperature is shown. The range of acceptable values is 35 to 99 F (1 to 37 C). Press the Mode button to continue. See Fig. 3.

3. The heating set point for Occupied 1 will be displayed. Use the UP ARROW and DOWN ARROW buttons to raise or lower the heating set point until the desired temperature is shown. The range of acceptable values is 35 to 99 F (1 to 37 C). Press the Mode button to continue. See Fig. 3.

4. The cooling set point for Unoccupied will be displayed. Use the UP ARROW and DOWN ARROW buttons to raise or lower the cooling set point until the desired temperature is shown. The range of acceptable values is 35 to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied cooling). To configure the Unoccupied Cooling set point to OF, press the UP ARROW button until 99 F is displayed. Press the UP ARROW button again to display OF. Press the Mode button to continue.

5. The heating set point for Unoccupied will be displayed. Use the UP ARROW and DOWN ARROW buttons to raise or lower the heating set point until the desired temperature is shown. The range of acceptabl e values is 35 to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied heating). To configure the Unoccupied Heating set point to OF, press the DOWN ARROW button until 35 F is displayed. Press the DOWN ARROW button again to display OF. Press the Mode button to continue.

6. The day of the week will be shown. Use the UP ARROW and DOWN ARROW buttons to change the day of the week until the desired starting day is shown. Possible choices are Mo (Monday) through Su (Sunday). Press the Mode button when the desired day is shown.

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. 4.

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 T ime is shown. Press the Mode button to continue.

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.

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 a fter all the occupi ed periods 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. 5.

If NO was selected, the schedule will automatically change to the next day and the user must enter the occupied 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 Sunday 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 and hold the Mode and UP ARROW buttons to exit Programming mode.

NOTE: The thermostat will continue to follow the schedule 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 th e stop time an d then from the start ti me 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 priority. F or example, if schedule Occupied 3 is running for 24 hours and Occupied 2 schedule 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 by pressing the UP or DOWN ARROW buttons to change the desired temperature. The thermostat will use the new set point until the next scheduled time period starts.

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