50QE900
Aquazone™ Water Source Heat Pump
Commercial Light-Activated
Programmable Thermostat
Owner’s Manual
Part Number 50QE900-220LA
CONTENTS
CONFIGURATION
Page
Thermostat Display — The thermostat display is locat-
ed in the center of the thermostat. See Fig. 1. The following
information can be displayed on the screen:
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Thermostat Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Heat or Cool Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Thermostat Front Panel Buttons . . . . . . . . . . . . . . . . . 1
Thermostat Programming Buttons . . . . . . . . . . . . . . . 2
Set Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Programming Thermostat Schedules. . . . . . . . . . . . . 3
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4,5
Auto-Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Light-Activated Operation. . . . . . . . . . . . . . . . . . . . . . . . 4
Two-Stage Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Clock Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fan Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Holiday Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
• 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)
IMPORTANT: Read entire instructions before program-
ming the thermostat.
GENERAL
Carrier’s Aquazone 7-day, commercial, programmable ther-
mostats 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.
Fig. 1 — Thermostat Display
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 inter-
nal NEVERLOST™ memory stores programs for an unlimited
time.
Heat or Cool Indicator — A Heat or Cool indicator is
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.
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 func-
tions. Call the installer to reconfigure the security level.
Thermostat Front Panel Buttons — The thermostat
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 tem-
perature 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.
A light sensor is provided on the thermostat for light activa-
tion. 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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 535-00110 Printed in U.S.A. Form 50QE-3SO Pg 1 6-03 Replaces: New
Book 1
4
Tab 5a 5a
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99 F (1 to 37 C). Press the Mode button to continue. See
Fig. 5.
Programming Thermostat Schedules — Before
programming the thermostat, plan the thermostat daily sched-
ule. 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 Table 1 below as an aid to programming the daily
schedules.
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 tem-
perature 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.
NOTE: 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. The
Occupied 1 schedule should be turned OFF to keep the ther-
mostat from entering Occupied 1 while the room is unoccu-
pied. If the Occupied 1 schedule is turned ON, the thermostat
will enter Occupied 1 per the schedule regardless of light acti-
vation. 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.
Fig. 5 — Setting Occupied 1 Set Points
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 tem-
perature 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 tem-
perature 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.
PROGRAMMING MODE — To program the daily sched-
ules, 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 set 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 tem-
perature is shown. The range of acceptable values is 35 to
Table 1 — Daily Schedule Planner
SCHEDULE
Occupied 2
Start / Stop / Heat / Cool
DAY
OF THE
WEEK
Occupied 1
Start / Stop / Heat / Cool
Occupied 3
Start / Stop / Heat / Cool
Unoccupied
Heat / Cool
Monday
Tuesday
Wednesday
Thursday
Friday
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Saturday
Sunday
NOTE: The cooling temperature set point must be higher than the heating temperature set point.
3
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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.
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.
Fig. 6 — Start Time Display
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.
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.
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.
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.
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.
12. After all the times and set points for each day have been
entered, press the Program button to finish entering the
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.
Fig. 7 — Copy Command Display
If Fan On is not selected, the fan will only operate during
heating or cooling operation.
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DOWN ARROWS to select the number of days that the holi-
day schedule will be in effect. A value of 0 disables Holiday
mode. The duration can be set from 1 to 99 days. The thermo-
stat will enter Holiday mode on midnight of the next day after
the mode has been activated. Holiday mode will remain in
effect until midnight of the last configured day.
If the Holiday mode is in effect, the number of days remain-
ing will blink on and off and the ‘‘Unoccupied’’ icon will be
displayed. The Override button will be active during Holiday
mode. The Dry Contact Switch is ignored.
Emergency Heat — Emergency heat is available for
heat pump applications. To turn on emergency heat, press and
hold the Fan button. While holding the Fan button, press the
UP button for 2 seconds. An ‘‘EH’’ will be displayed. During
emergency heat, the fan will operate and the second stage of
heat will be energized (locking out the first stage compressor).
To exit emergency heat, press and hold the Fan button. While
holding the Fan button, press the UP button for 2 seconds. Dur-
ing emergency heat, only OFF and HEAT modes are available.
Holiday Mode — When the thermostat is in Holiday
mode, the thermostat will operate under Unoccupied set points.
To configure and activate the Holiday mode, press the Holiday
button. The ‘‘HOL’’ icon will be displayed along with the
remaining days of Holiday mode operation. Press the UP or
To turn off the Holiday mode before the remaining config-
ured days have passed, press the Holiday button to enter the
configuration mode. Press the DOWN ARROW to set the
number of days to zero. Holiday mode will be disabled.
5
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Copyright 2003 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 535-00110 Printed in U.S.A. Form 50QE-3SO Pg 8 6-03 Replaces: New
Book 1
4
Tab 5a 5a
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