Carrier Heat Pump 50QE900 250FS User Manual

50QE900  
Aquazone™ Water Source Heat Pump  
Flush-Mounted Flatstat  
Commercial Programmable Thermostat  
Owner’s Manual  
Part Number 50QE900-250FS  
CONFIGURATION  
IMPORTANT: Read entire instructions before program-  
ming the thermostat.  
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:  
CONTENTS  
mode (OFF, HEAT, COOL, AUTO, or PROGRAM ON)  
fan setting (FAN ON or blank)  
override indication  
Page  
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
room temperature  
CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4  
Thermostat Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Heat or Cool Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Thermostat Front Panel Buttons . . . . . . . . . . . . . . . . . 1  
Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Set Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Program Thermostat Schedules. . . . . . . . . . . . . . . . . . 2  
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Auto-Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Two-Stage Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Clock Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Fan Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Holiday Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Dry Contact Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Remote Temperature Sensor . . . . . . . . . . . . . . . . . . . . . 4  
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 — A Heat or Cool indicator is  
located in the middle 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 — The thermostat  
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 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  
GENERAL  
Carrier’s Aquazone 7-day, commercial, programmable ther-  
mostats are flat, 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 settings to be programmed per 24-hour peri-  
od. Each thermostat stores programs for 7 independent days.  
Batteries are not required. During power interruption the inter-  
nal NEVERLOST™ memory stores programmed schedules  
for an unlimited time.  
IMPORTANT: The thermostat has a configurable secu-  
rity level. If certain functions are not available (changing  
set points, changing programming schedules), the ther-  
mostat security level may be configured to exclude those  
functions. Call the installer to reconfigure the security  
level.  
Fig. 1 — Thermostat Display  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 111 Catalog No. 535-00111 Printed in U.S.A. Form 50QE-4SO Pg 1 6-03 Replaces: New  
Book 1  
4
Tab 5a 5a  
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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  
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 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. 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 tem-  
perature 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 acceptable 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.  
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 the stop time and then from the start time to mid-  
night. 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 an-  
other occupied period, the lower numbered schedule has priori-  
ty. For 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.  
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 Time 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.  
Fig. 4 — Start Time Display  
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 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. 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.  
Fig. 5 — Copy Command Display  
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Table 1 — Daily Schedule Planner  
SCHEDULE  
Occupied 2  
DAY OF  
THE WEEK  
Occupied 1  
Start / Stop / Heat / Cool  
Occupied 3  
Unoccupied  
Start / Stop / Heat / Cool  
Start / Stop / Heat / Cool  
Start / Stop / 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.  
OPERATION  
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 Mode  
and UP ARROW buttons simultaneously to enter Program-  
ming mode. Press the Override button to enter Holiday Pro-  
gramming mode. The ‘‘HOL’’ icon will be displayed along  
with the remaining days of Holiday mode operation. Press the  
UP or DOWN ARROWS to select the number of days that the  
holiday schedule will be in effect. A value of 0 disables Holi-  
day mode. The duration can be set from 1 to 99 days. The ther-  
mostat 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.  
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 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.  
To turn off the Holiday mode before the remaining config-  
ured days have passed, press the Mode and UP ARROW  
buttons simultaneously for 2 seconds to enter Programming  
Mode. Press the Override button to enter Holiday Program-  
ming mode. Press the DOWN ARROW to set the number of  
days to zero. Holiday mode will be disabled.  
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.  
Dry Contact Switch — A dry contact switch is provided  
to allow an external device to force the thermostat into Occu-  
pied 1. When the thermostat is forced into Occupied 1 via  
the dry contact closure, the Occupied 1 icon will blink each  
second.  
Clock Backup — In the event of a power loss, the thermo-  
stat will keep time for a minimum of 48 hours without  
external power or batteries.  
SOFT START — When multiple thermostats are controlled  
by the same external device, a Soft Start option can be used to  
stagger the turn on times of the HVAC equipment. This feature  
may cause a delay in operation after entering Occupied 1.  
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.  
Remote Temperature Sensor — A remote tempera-  
ture sensor is available to read the temperature from a space. If  
a remote temperature sensor is connected and the thermostat is  
configured to use a remote temperature sensor, then the ther-  
mostat will ignore the reading of its internal sensor and control  
to the reading of the remote temperature sensor. When the  
thermostat is using a reading from a remote sensor, the degree  
symbol above the temperature reading will blink.  
If Fan On is not selected, the fan will only operate during  
heating or cooling operation.  
Emergency Heat — Emergency heat is available for  
heat pump applications. To turn on emergency heat, press and  
hold the Override button. While holding the Override button,  
press the UP ARROW button. 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 com-  
pressor). To exit emergency heat, press and hold the Override  
button. While holding the Override button, press the UP  
ARROW button. During emergency heat, only OFF and HEAT  
modes are available.  
NOTE: This feature is configured by the installer.  
4
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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. 535-00111 Printed in U.S.A. Form 50QE-4SO Pg 8 6-03 Replaces: New  
Book 1  
4
Tab 5a 5a  
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