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
88
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
o
73
74
72
o
73
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
o
73
74
72
AUTO
o
73
74
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