Carrier 50QE900-250FS User Manual
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
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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