Carrier 50QE900 User Manual

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Aquazone™ Water Source Heat Pump

Fig. 1 — Thermostat Display

Commercial Light-Activated

Programmable Thermostat

Owner’s Manual

Part Number 50QE900-220LA

50QE900

CONTENTS

Page

GENERAL CONFIGURATION

Thermostat Display Heat or Cool Indicator Thermostat Front Panel Buttons Thermostat Programming Buttons Set Clock Programming Thermostat Schedules

OPERATION Auto-Changeover Light-Activated Operation Two-Stage Operation Clock Backup Fan Operation Emergency Heat Holiday Mode

IMPORTANT: Read entire instructions before programming the thermostat.

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GENERAL

Carrier’s Aquazone 7-day, commercial, programmable thermostats are wall-mounted, low-voltage thermostats which 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 setting 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 programs for an unlimited time.

IMPORTANT: The thermostat has a configurable security level. If certain functions are not available (changing set points, changing programming schedules), the thermostat security level may be configured to exclude those functions. Call the in sta ller t o rec onfig ure the se curi ty l evel .

A light sensor is provided on the thermostat for light activation. When the sensor detects light (the space is occupied), the thermostat will enter Occupied 1 mode. If the room is dark, the thermostat will follow its programmed schedule.

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 Programmi ng mode )

Heat or Cool Indicator —

located on the bottom left cover of the thermostat. See Fig. 2. The light will be red if the thermostat is in Heating mode. The light 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 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 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.

The thermostat display is locat-

A Heat or Cool indicator is

The thermostat

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. 535-00110 Printed in U.S.A. Form 50QE-3SO Pg 1 6-03 Replaces: New

OVERRIDE BUTTON — The Override button is used to

Fig. 4 — Setting the Clock

force the thermostat from Unoccupied mode into the Occupied 1 mode comfort settings. The Override period will be set at 30 minutes. 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 O verride button is pressed up to a maximum of 4 hours. After the 4-hour limit has been reached, 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.

Thermostat Programming Buttons —

stat has programming buttons which are used to change the set points of the thermostat, set the modes, and program schedules. The programming buttons are accessible from underneath the thermostat cover. To access the program ming buttons, pull on the hinged thermostat cover. See Fig. 3. The programming buttons are: Mode, Fan, Holiday, Program, and Set Clock.

The UP ARROW and DOWN ARROW buttons are used to scroll through programming set points. The buttons are also used to answer yes or no.

KEYPAD LOCK — The thermostat has a keypad lockout feature which will not acknowledge front panel buttons until the lockout sequence is entered. 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.

Fig. 2 — Thermostat Front Panel Buttons

The thermo-

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 .

FAN BUTTON OPERATION — The Fan button selects fan operation. When the fan is set to F AN ON, the fan will run continuously for improved air circulation.

NOTE: When the thermostat is in U noccupied mode, the fan will run only during heating or cooling operation, even if the fan is set to FAN ON; this is the energy-saving smart fan feature.

When the fan is not set to FAN ON (no icon displayed on thermostat screen), the fan will run during heating and cooling operation only .

MODE BUTTON OPERATION — The Mode button selects the operat ing mode o f the therm ostat. If OFF is se lected, 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 heating set point). If COOL is selected, the thermostat will only ente r Cooling mode (if the room temperature is above the cooling set point). If AUTO is selected, the thermostat will enter Heating 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 AUTO, the thermostat will provide automatic changeover from Heating to Cooling mode and Cooling to Heating mode when required. The t herm os tat w il l a utom ati cal ly s w itch to mai ntai n the desired temperature setting. The thermostat does not need to be manually changed from heating to cooling or cooling to heating operation.

HOLIDAY MODE — The Holiday button places the thermostat into Holiday mode. During Holiday mode, the unoccupied set points are enforced. The number of days the thermostat will be in Holiday mode can be set.

Set Clock —

change the time and day displayed on the thermostat. Press the Set Clock button to enter Set Time mode. See Fig. 4. 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 AM and PM annunciators will automatically change. To scroll through by hours only, press and hold down the Fan button while pressing the UP or DOWN ARROW buttons. 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/Next 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 the Set Clock button again to exit the Set Time mode.

— When the thermostat mode is set to

The Set Clock button allows the user to

Fig. 3 — Thermostat Programming Buttons

Programming Thermostat Schedules —

Fig. 5 — Setting Occupied 1 Set Points

Before programming the thermostat, plan the thermostat daily schedule. The schedule is divided into 7 days (Monday through Sunday). Each day can have 2 (Occupied 1, Unoccupied), 3 (Occupied 1, Occupied 2, Unoccupied), or 4 (Occupied 1, Occupied 2, Occupied 3, Unoccupied) time periods. Each occupied time period has a start time, stop time, heating set point and a cooling set point. The unoccupied time period has a heating set point and a cooling set point. The unoccupied time period is active whenever an occupied time period is not active. Fill in T able 1 below as an aid to programming the daily schedules.

NOTE: When the sensor detects light (t he space is occupied), the thermostat will enter Occupied 1 mode. If the room is dark, the thermostat will follow its programmed schedule. The Occupied 1 schedule should be turned OFF to keep the thermostat from entering Occupied 1 while the room is unoccupied. If the Occupied 1 schedule is turned ON, the thermostat will enter Occupied 1 per the schedule regardless of light activation. The Occupied 1 set points are used as the heating and cooling set points during light activation. The Unoccupied set points should be used as non-work hour set points (before 8:00 AM and after 5:00 PM) when using light activation. For times when the building is unoccupied during work hours (Monday through Friday, 8:00 AM to 5:00 PM), the Occupied 2 schedule should be turned ON, and can be used for moderate energy savings with set points of 80 F for cooling and 65 F for heating.

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

1. Enter Programming mode by pressing the Program button. The Occupied 1 annunciator will appear on the thermostat display. See Fig. 5. Use the UP ARROW and DOWN ARROW buttons to set the maximum number of Occupied periods available. The thermostat can be se t to 1, 2, or 3. After the number of Occupied periods has been selected, press the Mode button.

2. The cooling set point for Occupied 1 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). Press the Mode button to continue. See Fig. 5.

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. 5.

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). 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 acceptable values is 35 to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied heating). 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 M (Monday) through S (Sunday). Press the Mode button when the desired day is shown.

DAY

OF THE

WEEK

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

NOTE: The cooling temperature set point must be higher than the heating temperature set point.

Occupied 1 Occupied 2 Occupied 3 Unoccupied

Start / Stop / Heat / Cool Start / Stop / Heat / Cool Start / Stop / Heat / Cool Heat / Cool

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Table 1 — Daily Schedule Planner

SCHEDULE

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