Debonair®
Commercial Non-Programmable Thermostat
Installation, Start-Up, and Operating
Instructions
Part Number 33CSSN2-WC
33CS
IMPORTANT: Read entire instructions before starting
the installation.
SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Follow all local electrical codes during installation. All wiring
must conform to local and national electrical codes. Improper
wiring or installation may damage thermostat.
Recognize safety information. This is the safety alert symbol . When the safety alert symbol is present on equipment
or in the instruction manual, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety alert symbol.
DANGER identifies the most serious hazards which will result
in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION
is used to identify unsafe practices which would result in minor
personal injury or property damage.
GENERAL
The commercial, non-programmable thermostats are wallmounted, low-voltage thermostats which maintain room temperature by controlling the operation of an HVAC (Heating,
Ventilation, and Air Conditioning) system. Separate heating
and cooling set points and auto-changeover capability allow for
greater flexibility.
Batteries are not required. During power interruption the internal NEVERLOST™ memory stores configuration settings
for an unlimited amount of time.
The thermostat can be configured to accept several different
equipment configurations, including heat pump operation.
The temperature display range of the thermostat is 32 to
99 F (0° to 36 C).
NOTE: The thermostat is not factory-configured for use in heat
pump applications. The Advanced Setup must be performed to
configure the thermostat for use with heat pump units.
INSTALLATION
The thermostat should NOT be mounted:
• close to a window, on an outside wall, or next to a door
leading to the outside
• where exposed to direct light and heat from a lamp, the
sun, a fireplace, or any other temperature-radiating
object which may cause a false reading
• close to or in direct airflow from supply registers or
return-air grilles
• in areas with poor air circulation (such as behind a door
or in an alcove)
Install Thermostat
Before installing thermostat, turn off all power to the unit.
There may be more than one power disconnect. Electrical
shock can cause injury or death.
1. Turn off all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from the wall.
b. Disconnect wires from existing thermostat. Do not
allow wires to fall back into the wall. As each wire
is disconnected, record wire color and terminal
connection.
c. Discard or recycle old thermostat.
NOTE: Mercury is a hazardous waste and must be
disposed of properly.
3. Remove the thermostat cover from wall plate (mounting
base) to expose mounting holes. See Fig. 1.
MOUNTING
HOLE
R
3 1/8"
WIRING
TERMINAL
B
O
Y1
W2
Y2
W1
C
G
BLOCK
1"
Select Thermostat Location —
be mounted:
• approximately 5 ft from the floor
• close to or in a frequently used room, preferably on an
inside partitioning wall
• on a section of wall without pipes or ductwork
• where temperature operating limits are within 32 to
122F(0°to50C)
• where humidity operating range is within 0 to 95% relative humidity, non-condensing
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 1 1a 1 3a
PC 111 Catalog No. 533-348 Printed in U.S.A. Form 33CS-32SI Pg 1 105 8-00 Replaces: New
The thermostat should
3 1/8"
HOLE FOR
WIRING
MOUNTING
HOLE
Fig. 1 — Thermostat Mounting and Wiring
4. Route thermostat wires through large hole in mounting base. Remove outer sheath from wires for added flexibility. Standard solid or multi-conductor thermostat wire
should be used from the thermostat to the unit. Size and
length considerations are as follows: for a maximum
distance from unit of 36 ft, use 22 AWG (American
Wire Gage) wire; for a maximum distance from unit
of 100 ft, use 18 AWG wire.
5. Level mounting base against wall and mark wall through
the 2 mounting holes in base.
6. Drill two
3
/16-in. mounting holes in wall where marked.
Be careful not to drill into wiring in wall. Electrical shock
could result.
7. Secure mounting base to wall with 2 screws and anchors
provided. Ensure all wires exit through hole in mounting
base.
8. Adjust wire length and routing to allow proper closure of
the thermostat. Strip each wire at the end no more than
1
/4-in. to prevent adjacent wires from shorting together.
Match and connect wires to terminals on the thermostat.
See Fig. 2-7 and Table 1.
Improper wiring or installation may cause damage to the
thermostat. Check to ensure wiring is correct before proceeding with installation of unit.
9. Push excess wiring into wall. Seal hole in wall to prevent
drafts.
10. Re-attach thermostat cover to back plate.
11. Turn on power to unit. The thermostat will receive power
from the unit. The thermostat will be powered by 24 v,
nominal (18 to 30 vac). Terminals R (+ 24 v), W1/O/B
(first stage heat or reversing valve), Y1 (first stage cooling), and G (fan relay) will always be connected. Some
applications will use C (common), Y2 (second stage
cooling), or W2 (second stage heating).
Heat Pump Configuration — To configure the ther-
mostat for heat pump operation, Advanced Setup Steps 1 (Heat
Pump Operation) and 2 (Reversing Valve Polarity) must be
configured correctly. See the Configure Advanced Setup section for information on configuring these options.
NOTE: Some large commercial rooftop heat pump units must
be configured with Advanced Setup Step 1 (Heat Pump Operation) set to OFF. Refer to the base unit instructions for more
information.
THERMOSTAT
G
R
*If using electric heat, this option must be
set to ON during Advanced Setup.
Y1
W2
B
O
W1
Y2
C
COMPRESSOR RELAY
FAN RELAY
1st STAGE HEAT*
24 VAC
TYPICAL
UNIT
L
E
C
G
Y1
O
W1
R
Y2
W2
THERMOSTAT
G
R
*If using electric heat, this option must be
set to ON during Advanced Setup.
Y1
W2
W1
B
O
C
Y2
Fig. 3 — Typical Wiring (5-Wire, Single-Stage
Cooling, Single-Stage Heating Applications)
THERMOSTAT
G
R
*If using electric heat, this option must be
set to ON during Advanced Setup.
Y1
W2
B
O
W1
C
Y2
2nd STAGE COMPRESSOR RELAY
Fig. 4 — Typical Wiring (6-Wire, 2-Stage
Cooling, Single-Stage Heating Applications)
THERMOSTAT
G
R
*If using electric heat, this option must be
set to ON during Advanced Setup.
→
Fig. 5 — Typical Wiring (6-Wire, Single-Stage
Y1
W2
B
O
W1
Y2
C
Cooling, 2-Stage Heating Applications)
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
1st STAGE HEAT*
24 VAC
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
1st STAGE HEAT*
24 VAC
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
1st STAGE HEAT*
24 VAC
2nd STAGE HEAT CIRCUIT
TYPICAL
UNIT
TYPICAL
UNIT
TYPICAL
UNIT
L
E
C
G
Y1
O
W1
R
Y2
W2
L
E
C
G
Y1
O
W1
R
Y2
W2
L
E
C
G
Y1
O
W1
R
Y2
W2
Fig. 2 — Typical Wiring (4-Wire, Single-Stage
Cooling, Single-Stage Heating Applications)
105
2
THERMOSTAT
G
R
*If using electric heat, this option must be set to ON during Advanced Setup.
NOTE: Commercial heat pumps do not have the heat pump turned on in
Advanced Setup.
Y1
W2
B
O
W1
C
Y2
24 VAC COMMON
COMPRESSOR RELAY
1st STAGE HEAT*
2nd STAGE COMPRESSOR RELAY
2nd STAGE HEAT
FAN RELAY
24 VAC
TYPICAL
UNIT
Fig. 6 — Typical Wiring (7-Wire, 2-Stage Cooling
2-Stage Heating Applications)
THERMOSTAT
G
R
NOTE: If using residential heat pump, the heat pump must
be set to ON in Advanced Setup.
Y1
W2
W1
B
O
C
Y2
24 VAC COMMON
FAN RELAY
COMPRESSOR RELAY
REVERSING VALVE
24 VAC
TYPICAL
UNIT
Fig. 7 — Typical Wiring (5-Wire, Single-Stage
Cooling, Single-Stage Heating, Heat Pump
Applications)
→
Table 1 — Thermostat Wiring Terminations
EXISTING WIRE
DESIGNATION
GorF Fan G
Y1, Y, or C Cooling Y1
W1, W, or H Heating W1/O/B
Rh,R,M,Vr,orA Power (24 v) R
C Common C
O/B Reversing Valve* W1/O/B
Y2 Second Stage Cooling Y2
W2 Second Stage Heating W2
*Used on Heat Pump applications only.
FUNCTION
TERMINAL
CONNECTION
Configure Advanced Setup — To enter into the Ad-
vanced Setup screens of the thermostat, press the Mode and
Fan buttons at the same time for 7 seconds. The Advanced
Setup Step number is shown in the top right corner of the thermostat screen. Use the Mode button to advance through the
steps. See Table 2. Press the Mode and Fan buttons at the same
time to exit the Advanced Setup mode.
HEAT PUMP CONFIGURATION (Steps 1 and 2) — To set
the thermostat for heat pump operation, Advanced Setup
Step 1 must be configured to ON. Use the UP and DOWN ARROW buttons to configure the step. The default is OFF. Press
the Mode button to continue to Step 2. Step 2 is used to set the
reversing valve polarity for the heat pump. The variable can be
set to either ‘‘B’’ or ‘‘O.’’ Set the reversing valve polarity to the
correct value depending on the application. The default is ‘‘O.’’
L
E
C
G
Y1
O
W1
R
Y2
W2
L
E
C
G
Y1
O
W1
R
Y2
W2
NOTE: Some large commercial rooftop heat pump units must
be configured with Advanced Setup Step 1 (Heat Pump Operation) set to OFF. Refer to base unit instructions for more
information.
NOTE: Step 2 will appear only if Step 1 is set to ON. Step 3
will appear only if Step 1 is set to OFF.
→
ELECTRIC HEAT CONFIGURATION (Step 3) — Step 3
is used to configure the thermostat for first stage electric heat.
The variable can be configured ON or OFF. The default is OFF.
NOTE:Step3willappearonlyifStep1issettoOFF.
DEADBAND (Step 4) — The deadband is the difference in
temperature above the cooling set point or below the heating
set point that the thermostat will wait before turning on the first
stage of heating or cooling. For example, if the cooling set
point is 82 F (28 C) and the deadband is 2 degrees, the first
stage of cooling will not be energized until the temperature
reaches 84 F (30 C). The range of values is 1 to 6 degrees. The
default is 2 degrees.
SET POINT MINIMUM DIFFERENCE (Step 5) — The minimum difference between heating and cooling set points can be
user-configured. The range is from 0 to 6 degrees. The default
is 2 degrees. The minimum difference is enforced during
Autochangeover and Program On operation.
CYCLES PER HOUR LIMIT (Step 6) — The number of
times that heating or cooling can be energized per hour can be
configured. Set the variable to ‘‘d’’ for no limit. Set the variable
to ‘‘d1’’ to disable the 5-minute compressor lockout. The variable can also be set from 2 to 6 cycles per hour. The default is
6 cycles per hour.
Damage to compressor could result if 5-minute compressor
lockout is disabled or compressor is allowed unlimited
cycles. Do not set thermostat Advanced Setup Step 6 to
‘‘d’’ or ‘‘d1’’ unless specifically recommended for the
application.
BACKLIGHT DISPLAY (Step 7) — The display backlight
can be set to ON (always on) or OFF (turn off 8 seconds after
usage). The default is ON.
FAHRENHEIT/CELSIUS OPERATION (Step 8) — The thermostat can be set to operate in Fahrenheit or Celsius degrees.
Set the variable to ‘‘F’’ for Fahrenheit operation. Set the variable to ‘‘C’’ for Celsius operation. The default is ‘‘F.’’
Table 2 — Advanced Setup Configuration
STEP DESCRIPTION RANGE DEFAULT
1 Heat Pump Off/On Off
2 Reversing Valve Polarity O/B O
3 Electric Heat Off/On Off
4 Deadband 1 - 6 degrees 2
5
6 Cycles per Hour d, d1, 2 - 6 6
7 Thermoglow™ Backlight Off/On On
8 Temperature Units F/C F
Forced Minimum
Temperature Difference
0-6degrees 2
Install Accessories — The Add-A-Wire™ accessory
can be used with this thermostat.
Refer to the Add-A-Wire accessory installation instructions
for more information.
Calibrate Sensor — Every thermostat is factory-calibrated.
Under normal circumstances there will never be a need to
re-calibrate the thermostat. If re-calibration must be done, perform
the following procedure:
1. Hold down the Mode and DOWN ARROW buttons for
5 seconds. All of the icons on the display screen will
appear. Release the buttons.
3
105
2. Press the Mode button. The current temperature will be
displayed.
3. Use an accurate thermometer to measure room temperature. Press the UP or DOWN ARROW buttons until the
number equals room temperature.
4. Press the Mode button to return to normal operation.
Check Thermostat Operation — To check thermo-
stat operation, perform the following procedure:
1. Press the Mode button repeatedly until the Heat icon appears on the display. The thermostat is now in Heating
mode.
2. Press the UP ARROW button until the heating set point is
10 F (6 C) higher than the current room temperature
Heating and fan should be energized.
3. Press the Mode button repeatedly until the Cool icon appears on the display. The thermostat is now in Cooling
mode.
4. Press the DOWN ARROW button until the cooling set
point is 10 F lower than the current room temperature.
Cooling and fan should be energized.
5. If heating, cooling, or fan operation do not energize,
check wiring and consult Table 3.
Final Checklist
1. Put away tools and instruments. Clean up debris and
packaging.
2. Review Owner’s Guide with occupant or owner. 3. Leave
the manuals with owner.
OPERATION
The Mode button selects the operating mode of the thermostat. 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 heating set point). If COOL is selected, the thermostat will only enter Cooling mode (if the room temperature is above the cooling
set point). If AUTO is selected, the thermostat will enter Heating or Cooling mode based on the room temperature and the
heating and cooling set points.
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.
Two-Stage Operation — The second stage of heat or
cool is turned on when the first stage has been on for a minimum 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.
Fan Operation — If Fan On is selected, the fan will run
continuously (except when Mode is switched to OFF).
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. This option is only available if
Advanced Setup Step 1 (Heat Pump) is set to ON. To turn on
emergency heat, press and hold the UP button. While holding
the UP button, press the Fan 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 compressor). To exit emergency heat, press and hold
the Fan button. While holding the Fan button, press the UP button. During emergency heat, only OFF and HEAT modes are
available.
Electric Heat — When the Electric Heat option in the ad-
vanced setup is set to ON (configured by installer), the thermostat will turn on the fan immediately any time there is a heat
demand. This feature should only be used on electric heating
applications. Do not use with gas heat.
Keypad Lock — To prevent unauthorized use of the ther-
mostat, 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 same 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.
→
PROBLEM SOLUTION
Display on thermostat not illuminated. Check for 24 vac at the R terminal connection. Terminal R must be connected for proper
Cooling will not energize. Select COOL mode. Decrease cooling set point to 10 degrees below room temperature.
Heating will not energize. Select HEAT mode. Increase heating set point to 10 degrees above room temperature.
When using 4 wires (R,G,W,Y), the cooling equipment tries
repeatedly to turn on, but cannot. At times the display dims or
disappears.
When using 4 wires (R,G,W,Y), the heating equipment tries
repeatedly to turn on, but cannot. At times the display dims or
disappears.
When controlling a heat pump, heat comes on during cooling cycle. Configure thermostat for heat pump operation (Table 2, Step 1).
When calling for cooling, both heating and cooling are energized. The thermostat is configured for a heat pump. Configure the thermostat for non-heat
When controlling a commercial heat pump unit, unit runs in reverse
or heating is always on.
Copyright 2000 Carrier Corporation
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 1 1a 1 3a
PC 111 Catalog No. 533-348 Printed in U.S.A. Form 33CS-32SI Pg 4 105 8-00 Replaces: New
TROUBLESHOOTING
Table 3 — Troubleshooting
thermostat operation.
Check for 24 vac at Y1 terminal with a load connected. If present, thermostat is operating
correctly and problem is with wiring or equipment. If 24 vac is not present, replace the
thermostat. Check for Compressor Cycle per Hour Limit. Cooling may be locked out.
Check for 24 vac at W1/O/B terminal with a load connected. If present, thermostat is operating correctly and problem is with wiring or equipment. If 24 vac is not present, replace
the thermostat.
There is not enough power available. Connect a 270 ohm, 10 watt power resistor at the air
conditioning equipment between terminals W and C (non-heat pump applications only).
There is not enough power available. Connect a 270 ohm, 10 watt power resistor
at the air-conditioning equipment between terminals Y and C (non-heat pump applications
only).
pump operation (Table 2, Step 1).
Some commercial heat pumps require that Heat Pump Option on ther mostat is turned
OFF. Refer to unit installation instructions for more information.
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