Honeywell T2798I-1000
Honeywell T2798I-1000
Honeywell T2798I-1000
Honeywell T2798I-1000
Honeywell T2798I-1000
Honeywell T2798I-1000
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T2798I-1000

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The T2798I-1000 is a high-precision UCEN-22 series temperature controller with one PT1000 analog input and one dry contact digital input.
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Technical specifications for T2798I-1000

  • Manufacturer:
    Honeywell
  • Part Number:
    T2798I-1000
  • Product Family:
    Honeywell FSC Series
  • Product Type:
    Standalone LCD Temperature Controller
  • Stock:
    1
  • Controller Type:
    Standalone microcontroller-based LCD temperature controller
  • Control Action:
    Proportional plus integral and on/off
  • Analog Input:
    1 × PT1000
  • Digital Input:
    1 × dry contact
  • Analog Output:
    1 × selectable 2–10 VDC or 4–20 mA
  • Analog Output Action:
    Direct or reverse acting
  • Digital Output:
    1 × on/off, 2 A at 24 VAC
  • Internal Sensor Setpoint Range:
    10−50 °C
  • External Sensor Setpoint Range:
    −20−110 °C
  • Power Supply:
    24 VAC ±20%, 50/60 Hz
  • Power Consumption:
    2 VA
  • Control Accuracy:
    ≤ ±0.3 °C
  • Operating Ambient:
    0–50 °C; 5–80% RH
  • Shipping and Storage:
    −20–45 °C; 5–95% RH
  • Maximum Remote Sensor Cable:
    15 m
  • Maximum Sensor Line Resistance:
    < 4.5 Ω
  • Zero Energy Band:
    1.5 °C or 3.0 °C
  • On/Off Differential:
    0.5–3.0 °C in 0.5 °C steps
  • Proportional Band:
    2.0–19.0 °C in 0.1 °C steps
  • Temperature Offset:
    −3.0 to +3.0 °C
  • Dimensions:
    13.2 × 10.0 × 2.07 cm
  • Terminals:
    Plug-in screw terminals for 1.5 mm² wire
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Control Modes Sensing & I/O Installation Application
  • Combines proportional plus integral modulating control with on/off control for commercial HVAC temperature applications.
  • Supports selectable internal sensing or a remote PT1000 sensor with adjustable control parameters.
  • Provides heat/cool changeover, sequenced heating and cooling, emergency interlocking, and temperature-limit alarming.

T2798I-1000 is a Honeywell standalone LCD temperature controller designed for commercial HVAC and air-handling equipment.

Its selectable modulating output controls compatible valve or damper actuators, while the on/off output supports switching, staging, or temperature-limit functions.

Before installation or replacement, verify the applicable hardware series, compatibility, wiring, configuration, and installed-system requirements.

Availability, condition, price, and shipping time for T2798I-1000 are confirmed during quotation.

Honeywell T2798I-1000 Standalone LCD Temperature Controller Manuals, Product Family, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Output 1 supports manual heating or cooling changeover for two-pipe AHU, zoning, and hydronic-heating applications.
  • Heating and cooling sequence control uses an adjustable zero-energy band centered on the temperature setpoint.
  • Output 2 can provide high- or low-temperature limitation using a separately configured limit setpoint.
  • The main sensor is selectable between the internal sensor and a remote PT1000 sensor with a maximum 15 m cable run.
  • The dry-contact input supports emergency interlocking and requires the documented terminal jumper when the interlock is unused.
  • The analog output supports direct or reverse 2–10 VDC or 4–20 mA operation, accompanied by a 24 VAC on/off output.
  • Mount the controller on a flat surface using a standard electrical box; internal sensing installations should be approximately 1.5 m above the floor.
  • Select a location with representative temperature and good airflow, away from drafts, duct discharge, radiant heat, concealed pipes, and chimneys.
  • Use the documented eight-terminal allocation and plug-in screw terminals suitable for conductors up to 1.5 mm².
  • Commercial air-handling unit temperature control
  • Hydronic heating temperature control
  • Heat-exchanger temperature control
Description
T2798I-1000 is a Honeywell standalone microcontroller-based LCD temperature controller for commercial HVAC and air-handling applications.

The unit provides proportional plus integral modulating control through a selectable 2–10 VDC or 4–20 mA analog output, together with on/off control, internal or remote PT1000 sensing, and a dry-contact emergency input.

Before installation or replacement, confirm the complete catalog number, hardware series, firmware, compatible equipment, wiring, mounting, and saved configuration.
Alternative Names
T2798I-1000 T2798I1000 T2798I 1000 Honeywell T2798I-1000 Honeywell T2798I1000 Honeywell T2798I 1000
Technical notes
Honeywell T2798I-1000 uses internal or remote PT1000 sensing. Verify 24 VAC wiring, output selection, actuator compatibility, and saved control settings before replacement.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can Honeywell T2798I-1000 be treated as the same product as T2798I2000?
No direct interchangeability should be assumed. They are different catalog identities. Compare output configuration, terminal allocation, control modes, sensor arrangement, mounting, and the applicable Honeywell wiring documentation before replacement.
Which actuators can Honeywell T2798I-1000 control?
Its selectable 2–10 VDC or 4–20 mA output is intended for compatible modulating actuators. Honeywell documentation lists Series 70 devices such as ML7161, ML7174, M7410E, ML7420, ML7421, ML7425, and ML7984; verify the exact actuator signal before connection.
Is the RSPT1000 remote sensor included with Honeywell T2798I-1000?
No. The RSPT1000 duct-mounted PT1000 sensor is listed as a separately ordered accessory. Confirm whether the installation will use the controller’s internal sensor or an external PT1000 sensor.
What happens if the emergency input on Honeywell T2798I-1000 is left open?
An open emergency contact drives the outputs closed—or to maximum in reverse mode—and requires manual restart. When the interlock is unused, the Honeywell diagram requires a jumper between terminal 5 and terminal 3.
Where should Honeywell T2798I-1000 be installed when using its internal sensor?
Install it approximately 1.5 m above the floor in an area representing average room temperature with good airflow. Avoid drafts, duct discharge, direct radiant heat, concealed pipes, chimneys, and dead-air locations.
Which settings should be recorded before replacing Honeywell T2798I-1000?
Record the selected sensor, operating mode, output signal, direct or reverse action, setpoint, zero-energy band, differential, proportional band, offset, temperature-limit setpoint, and terminal wiring.
What should be checked if the analog output of Honeywell T2798I-1000 operates in the wrong direction or remains inactive?
Check the 2–10 VDC/4–20 mA selector, direct/reverse setting, operating mode, manual-output setting, emergency-input jumper, PT1000 selection, and actuator wiring before replacing the controller.