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Commercial Thermostats Carrier 33CSCNACHP-FC

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Commercial Non-Programmable Fan Coil Thermostat

Carrier’s commercial non-programmable thermostats offer flexibility, quality, and reliability. The wall-mounted, low-voltage thermostat maintains room temperature by controlling the operation of an HVAC (heating, cooling and ventilation) system. This thermostat can be used to control fan coil operation. Separate heating and cooling set points and auto-changeover capability allow for energy savings.



VIRGINIA: Alexandria, Annandale, Arlington, Ashburn, Burke, Centreville, Chantilly, Crystal City, Dale City, Dulles, Fairfax, Falls Church, Fort Belvoir, Great Falls, Herndon, Leesburg, Lincoln, Lorton, Manassas, McLean, Oakton, Purcellville, Reston, Springfield, Stafford, Sterling, Vienna, Woodbridge.

MARYLAND: Annapolis, Aspen Hill, Beltsville, Bethesda, Chevy Chase, College Park, Gaithersburg, Hampstead, Hyattsville, Lanham, Laurel, Montgomery Village, Potomac, Rockville, Silver Spring, Takoma Park, Temple Hills, National Harbor, Cabin John, East Riverdale, Riverdale, Landover, Cheverly, Oxon Hill, Fort Washington, Indian head, Morningside.


HVAC – Heating – Air Conditioning Repair Experts at Perryaire.


Carrier’s Comfort™ Pro Commercial Non-Programmable Thermostats Offer:

  • Non-mercury, non-lead based electronic controls built into slim plastic enclosure
  • 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 protection
  • 24 vac or battery powered user configured 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

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 added.

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.


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


24 vac 50/60 Hz at 3 va RC/RH compatible

AA alkaline battery power also available (batteries not included)


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), non-condensing


FCC Part 15, Subpart J compliant

Title 24 compliant

CE mark approval


Inputs: 24 vac, 50/60 Hz, 3 va


  • Minimum Load = 1000 ohms
  • Maximum Load = 2.0 A, 50% pf (power factor) Inductive
  • Nominal Load Capacity = 1.5 Amps


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.


  • Remote space sensor (33ZCT55SPT)
  • Outdoor temperature sensor (33ZCSENOAT)
  • Supply/return air sensor (33ZCSENSAT)
  • Changeover sensor for 2-pipe fan coil (33CSWCOFC-01)

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