Carrier Debonair 33CS, 33CSSN2-WC Installation And Operating Instructions Manual

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