Carrier Aquazone 50QE900-NPWS User manual

OWNER'S MANUAL
P/N 50QE900-NPWS
Commercial
Digital Thermostat
Dual Setpoint
Large, Easy To Read Display
Thermoglow Backlight
No Batteries Required
Auto Changeover
Adjustable Deadband
B or O Terminal
Locking Keypad
Locking Cover with
Tamper proof Screws
F or C
Commercial Systems & Services Carrier Corporation 3/00
Carrier
o
73
74
Carrier
AQUAZONE
Designed for Commercial Water Source Heat Pumps

Table Of Contents
FRONT PANEL
DISPLAY
BASIC OPERATION
ADVANCED SETUP
ABOUT ADVANCED OPERATION
WARRANTY
Page 1
CAUTION
Follow Installation Instructions before proceeding.
SET THERMOSTAT TO MODE “OFF” PRIOR TO
CHANGING SETTINGS IN SETUP OR RESTORING
FACTORY DEFAULTS.
P/N 50QE900-NPWS
2
3
5
7
10
15
Commercial Systems & Services Carrier Corporation 3/00

Front Panel
Page 2
Liquid Crystal Display
with Thermoglow
Up/Down Buttons
Mode Button
Fan Button
Heat or Cool Indicator
Heat = Red, Cool = Green
1
2
3
4
5
2
3
45
1
88
OFFON
AUTO
Setup
o
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88
Carrier

88
OFFON
AUTO
Setup
o
88
88
1
2
3
Mode Indicators
Selects the operation mode of the equipment.
- indicates the heat mode.
- indicates the air conditioning mode.
AUTO - indicates the system will automatically
changeover between heat and cool
modes as the temperature varies.
OFF - indicates the entire system is turned off.
Room Temperature Display
Indicates the current room temperature.
Desired Set Temperature
Indicates desired room temperature(s). Page 6.
Display
Page 3
1
1
1
2
3
3
5
6
4
1

4
5
6
Setup Indication
Indicates the thermostat is in the Advanced
Setup mode. Page 7.
Fan Operation Indication
- indicates constant, continuous fan
operation.
When Fan On is not lit - indicates the fan will
only operate when necessary to heat or
to cool. Page 6.
Locked Indication
appears after the right combination of
buttons are pressed, rendering the buttons
inoperative. Page 12.
Display
Page 4

The HEAT setting indicates the
temperature the room has to
reach before the furnace will
turn on to heat the room.
The COOL setting indicates the
temperature the room has to
reach before the air conditioner
will turn on to cool the room.
OFF indicates both heating
and air conditioning
systems are turned off.
AUTO will automatically select
heat or cool based on room
temperature demand.
Select Mode
Basic Operation
Page 5
Press
MODE
Press
MODE
Press
MODE
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72
o
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72
AUTO
o
73
74
OFF
o
73

buttons.
In any mode, adjust the
desired Set Temperature
with
Pressing the up/down buttons in Auto mode will adjust both the heat and cool
set temperatures simultaneously.
Pressing the up/down buttons in Heat or Cool modes will adjust only the
heat or cool set temperature.
Select Desired Temperature
Page 6
Basic Operation
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AUTO
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Fan
Operation
indicates constant fan operation.
This feature is active even if the thermostat
is set to Off.
Press
FA N

Advanced Setup
Page 7
Press
Press
Press
Continued
Press the Mode button.
While holding the Mode,
press the Fan button for
7 seconds to enter Setup
screens.
NOTE: Each step # is located at
the top right corner of the
display for easy reference.
FA N
MODE
MODE
MODE
MODE
Adjust the deadband
from 1 - 6 degrees.
2
I
Setup
88
Adjust the minimum
difference between
cooling & heating
setpoints.
(0 - 6 )
81f
2
2
COOL
HEAT
Setup
Select the cycles per
hour limit.
d=cycles per hour
limit defeated.
d1=d + defeat 5 min.
Compressor lockout.
(d, d1, 2 - 6)
6
3
Cy
Setup

Advanced Setup
Page 8
Press
MODE
Select the display back-
light always On, or Off
after 8 seconds.
On
Off
Press
MODE
Setup
L I
4
ON
Continued
Select thermostat
operation in degrees
Fahrenheit or Centigrade.
C
F
Setup
F
5

Advanced Setup
Page 9
Step # Description Range Factory Default
1
2
3
4
5
6
Deadband or Temperature swing 1 - 6 2
Forced minimum difference heat/cool 0 - 6 2
Cycles per hour d, d1, 2 - 6 6
Thermoglow backlight Off / On On
Fahrenheit or Centigrade F / C F
Reversing Valve polarity O / B O
Advanced Setup Table
Press the Mode button.
While holding the Mode, press the Fan
button for 2 seconds to leave the Setup
screens. If no buttons are pressed, the
display will leave the setup screens after
30 seconds.
FA N
MODE
Select the reversing
valve polarity for
Heat Pump, O or B.
(Step 2 only appears if
heat pump is on in step 1)
B
O
0
Setup
6

About Advanced Features & Operation
Page 10
2 STAGE OPERATION - The 2nd Stage of heat or cool is
turned on when (1) the 1st Stage has been on for a
minimum of two minutes, and (2) the temperature spread
from the setpoint is equal to or greater than: the setpoint
plus the deadband, plus 2 degrees.
Heat
Setpoint
Cool
Setpoint
Dead
Band
Dead
Band
2 degrees 2 degrees
1st Stage
turn on
2nd Stage
turn on
1st Stage
turn on
2nd Stage
turn on
Heating Cooling
MINIMUM HEAT/COOL SETPOINT DIFFERENCE - The Heat
and Cool setpoints will not be allowed to come any closer
to each other than the value set in Advanced Setup step
# 2, on page 7. This minimum difference is enforced
during Auto changeover operation.
and Program On

About Advanced Features & Operation
Page 11
EMERGENCY HEAT -
the Fan button press
The Cool setpoint display
During Emergency Heat the thermostat will turn
on the fan and the 2nd stage of heat, when there is a
demand for heat, locking out the 1st stage compressor.
Exiting Emergency Heat is the same as entering. During
Emergency Heat only OFF and HEAT are available.
To turn on Emergency
Heat press in the Fan button. While holding
the Up button for 2 seconds.
will read ‘EH’.
Press for
Emergency Heat
FA N
73
eh
74

About Advanced Features & Operation
Page 12
KEYPAD LOCK - To prevent unauthorized use of the thermostat,
the front panel buttons may be disabled. To disable, or
‘lock’ the keypad, press and hold in the Mode button.
While holding the Mode button in, press the Up and Down
buttons in together. The Locked icon will appear on the
display.
Press all 3 for
Keypad Lockout
To unlock the buttons, again press and hold the Mode
button. While holding the Mode button in, press the Up
and Down buttons in together. The Locked icon will
disappear from the display.
MODE
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About Advanced Features & Operation
Page 13
DUAL SETPOINT BEHAVIOR - The adjustable setpoint range
is: 35 - 99 degrees in Fahrenheit and 7 - 35 degrees in
Centigrade. When in the modes Heat or Cool, this
adjustable range is unhampered.
When adjusting any Auto mode, the thermostat
allow the Heat setpoint to get closer to the Cool setpoint
than the value programmed as the minimum difference in
step 2, page 7.
When entering the Auto mode from Cool, the Heat and
Cool setpoints will remain spread apart by the amount
that they were adjusted, prior to entering Auto.
For example: If the Cool setpoint was set to 80 while
in the Cool mode and the Heat setpoint was adjusted to
70 while in the Heat mode, upon entering the Auto mode
the Heat and Cool setpoints would be 80 and 70. Both
setpoints would then move up and down together, (in this
example spread by 10 degrees), by pressing the up or
down buttons.
To move the Heat and Cool setpoints closer together,
enter the Cool or Heat mode by pressing the Mode button,
then adjust the setpoint(s) closer together. Heat is limited
to how close it can come to Cool by step 2, page 7.
will not

About Advanced Features & Operation
Page 14
FACTORY DEFAULTS - If, for any reason it is desirable to
return all stored settings back to the factory default
settings, press the Mode button. While holding the Mode
button in, press the Down button for 2 sec. All icons will
appear. Press and hold in the Fan button until Fd
appears. This resets all factory settings. To calibrate
room temperature, press the Mode button once more.
At this point use the Up and Down buttons to calibrate
room temperature, if needed. Press the Mode button to
return to normal operation. NOTE CAUTION ON PAGE 1.
LOCKING COVER
w/Tamper Proof Screws
Carrier
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Warranty
Page 15 P/N 88-256
One-Year Warranty - This Product is warranted to be free from defects in material and
workmanship. If it appears within one year from the date of original installation, whether or not
actual use begins on that date, that the product does not meet this warranty, a new or
remanufactured part, at the manufacturer’s sole option, to replace any defective part will be
provided without charge for the part itself; PROVIDED the defective part is returned to the
distributor through a qualified servicing dealer.
THIS WARRANTY DOES NOT INCLUDE LABOR OR OTHER COSTS incurred for diagnosing,
repairing, removing, installing, shipping, servicing or handling of either defective parts or
replacement parts. Such costs may be covered by a separate warranty provided by the installer.
THIS WARRANTY APPLIES ONLY TO PRODUCTS IN THEIR ORIGINAL INSTALLATION
LOCATION AND BECOMES VOID UPON REINSTALLATION.
LIMITATIONS OF WARRANTIES – ALL IMPLIED WARRANTIES (INCLUDING IMPLIED
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY) ARE
HEREBY LIMITED IN DURATION TOT THE PERIOD FOR WHICH THE LIMITED WARRANTY
IS GIVEN. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED
WARRANTY LASTS, SO THE ABOVE MAY NOT APPLY TO YOU. THE EXPRESSED
WARRANTIES MADE IN THIS WARRANTY ARE EXCLUSIVE AND MANY NOT BE ALTERED,
ENLARGED, OR CHANGED BY ANY DISTRIBUTOR, DEALER, OR OTHER PERSON
WHATSOEVER.
ALL WORK UNDER THE TERMS OF THIS WARRANTY SHALL BE PERFORMED DURING
NORMAL WORKING HOURS. AL REPLACEMENT PARTS, WHETHER NEW OR
REMANUFACTURED, ASSUME AS THEIR WARRANTY PERIOD ONLY THE REMAINING
TIME PERIOD OF THIS WARRANTY.
THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR:
1. Normal maintenance as outlined in the installation and servicing instructions or owners
manual including filter cleaning and/or replacement and lubrication.
2. Damage or repairs required as a consequence of faulty installation, misapplication, abuse,
improper servicing, unauthorized alteration or improper operation.
3. Failure to start due to voltage conditions, blown fuses, open circuit breakers or other
damages due to the inadequacy or interruption of electrical service.
4. Damage as a result of floods, winds, fires, lightning, accidents, corrosive environments or
other conditions beyond the control of the Manufacturer.
5. Parts not supplied or designated by the Manufacturer, or damages resulting from their use.
6. Manufacturer products installed outside the continental U.S.A., Alaska, Hawaii, and
Canada.
7. Electricity or fuel costs or increases in electricity or fuel costs from any reason whatsoever
including additional or unusual use of supplemental electric heat.
8. ANY SPECIAL INDIRECT OR CONSEQUENTIAL PROPERTY OR COMMERCIAL
DAMAGE OF ANY NATURE WHATSOEVER. Some states do not allow the exclusion of
incidental or consequential damages, so the above may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which may vary
form state to state.