Carrier 33CS Installation And Operating Instructions Manual

Installation and Operating Instructions
IMPORTANT: Read entire instructions before starting the

installation.

CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Select Thermostat Location . . . . . . . . . . . . . . . . . . . . . . 1
Install Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Changeover Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Configure Advanced Setup. . . . . . . . . . . . . . . . . . . . . . . 5
Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Calibrate Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Check Thermostat Operation. . . . . . . . . . . . . . . . . . . . . 6
Final Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8, 9
Select Desired Temperature . . . . . . . . . . . . . . . . . . . . . . 8
Four-Pipe Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Two-Pipe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Minimum Heat/Cool Temperature Difference . . . . . 8
Single Set Point Operation . . . . . . . . . . . . . . . . . . . . . . . 8
Dual Set Point Operation . . . . . . . . . . . . . . . . . . . . . . . . . 9
Outside Air Temperature Sensor . . . . . . . . . . . . . . . . . 9
Locking Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Dry Contact Switch/External Control . . . . . . . . . . . . . 9
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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 sym-
bol . When the safety alert symbol is present on equipment
or in the instruction manual, be alert to the potential for person-
al 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 fan coil non-programmable thermostats are wall-
mounted or unit-mounted, low-voltage thermostats that main-
tain room temperature by controlling the operation of a fan coil
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Book 1 4
Tab 11a 13a
Part Number 33CSSN2-FC
Catalog No. 533-30019 Printed in U.S.A.
Non-Programmable Thermostat
unit. Separate heating and cooling set points, auto-changeover
capability, 2-pipe or 4-pipe configurability, and single or dual
set point options allow for greater flexibility.
The thermostats are normally wall-mounted for 42C and
42D fan coil units. For 42S and 42V fan coil units, the thermo-
stat is mounted on the fan coil unit or inside the fan coil unit on
a junction box. For 42S and 42V fan coil units, the thermostat
may also be remote wall-mounted, if desired.
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 2-pipe or 4-pipe operation.
The temperature display range of the thermostat is 35 to
99 F (2 to 36 C).
IMPORTANT: The thermostat is factory-configured for
use in 4-pipe applications. The advanced setup must be
performed to configure the thermostat for use with 2-pipe
applications.
INSTALLATION

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
122 F (0° to 50 C)
• where humidity operating range is within 0 to 95% rela-
tive humidity, non-condensing
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 fan coil unit.
Form 33CS-55SI
33CS
Fan Coil
The thermostat should
Pg 1 11-04 Replaces: 33CS-51SI