Comfort™ Pro
Commercial Thermostat
Part Numbers 33CSCNACHP-01 and 33CSCNACHP-FC
Carrier’s Comfort™ Pro commercial nonprogrammable thermostats offer:
• non-mercury, non-lead based
electronic controls built into slim plastic
• 2-stage heat/2-stage cool with
auxiliary heat (air conditioning, heat
pump, and water source heat pump
units) (P/N 33CSCNACHP-01)
• 2-pipe/4-pipe fan coil with 3-speed fan
(2-speed for 2-pipe fan coil with
emergency heat, cool only, heat only
and automatic changeover)
• English/metric unit selection
• proportional integral control of heating
and cooling stages
• remote sensing and averaging
• keypad lockout security with passcode
• 24 vac or battery powered userconfigured settings are stored for an
unlimited period of time
• expanded backlit display features
mode and equipment status, and
outdoor-air temperature
• hospitality mode — display user set
point in place of actual temperature
• random start
actual temp
set at
Carrier’s commercial nonprogrammable thermostats
offer flexibility, quality, and
The wall-mounted, low-voltage thermostat maintains room temperature by
controlling the operation of an HVAC
(heating, cooling and ventilation) system.
Separate heating and cooling set points
and auto-changeover capability allow for
energy savings.
© Carrier Corporation 2013
Form 33CS-40PS
Agency approvals
The thermostat allows separate heating and cooling set
points. The thermostat stores installer configurations. In
the event of power interruption, the internal memory
stores set points for an unlimited time. When 24 vac is
not available to power the thermostat, batteries can be
The Comfort™ Pro commercial non-programmable
thermostat is capable of displaying the outside or
supply-air temperature using the remote sensor input.
NOTE: Designed and assembled in the U.S.A.
FCC Part 15, Subpart J compliant
Title 24 compliant
CE mark approval
Electrical characteristics
Inputs: 24 vac, 50/60 Hz, 3 va
Minimum Load = 1000 ohms
Maximum Load = 2.0 A, 50% pf (power factor)
Nominal Load Capacity = 1.5 Amps
Physical characteristics
Dimensions (L x W x D): 5.1-in. (129.54 mm) x 4.1-in.
(104.14 mm) x 1.1-in. (27.94 mm)
Appearance: plastic material; white smooth cover
Weight: approx. 1/2 lb (0.23 kg)
Lead-free design
Temperature control
The thermostat uses proportional integral calculation to
determine the number of stages required for heating or
cooling (and fan speed for fan coil units) to provide accurate temperature control.
Power requirement
24 vac 50/60 Hz at 3 va RC/RH compatible
AA alkaline battery power also available (batteries not
Remote space sensor (33ZCT55SPT)
Outdoor temperature sensor (33ZCSENOAT)
Supply/return air sensor (33ZCSENSAT)
Changeover sensor for 2-pipe fan coil
Environmental requirements
Operating temperature: 32 to 104 F (0° to 40 C)
Storage: –40 to 135 F (–40 to 57 C)
Humidity: 0 to 95% RH (relative humidity),
5.1 in.
(129.54 mm)
4.1 in.
(104.14 mm)
1.1 in.
(27.94 mm)
Carrier Corporation • Syracuse, New York 13221
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Section 10
Pg 2
Catalog No. 04-52330017-01
Printed in U.S.A.
Form 33CS-40PS
Replaces: 33CS-37PS
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