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Honeywell T2798I2000 Manual

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APPLICATION:

This standalone micro-controller based LCD temperature
controller provides proportional plus integral (P+I) and on/off
temperature control for commercial Heating, Ventilating & Air
Conditioning System such as Hydronic Heating, Air Handling
Unit, Heat Exchanger or Condensing Tower.
This controller has a modulating analog 2 to 10Vdc or 4 to
20mA output and a 2A on/off output to realize various optional
control functions including cool/heat changeover, heat/cool
sequence control, emergency interlocking and auto-alarming
control.

Table of Contents

Application.................................................1
Features....................................................1
Specification...............................................2
Control Operation........................................4
Installer SetUp............................................12
Page 1 of 18

FEATURES:

PI (proportional plus integral) control action
provides accurate, stable and comfortable
temperature control.
Compatible with series 70 direct-coupled
damper / valve actuator like ML7161,
ML7174, ML7420 / ML7421series ML7425,
ML7984 series, N20010, S10010, M7410E
series, CN7505, CN7510 / CN72 series
CN7220 & CN7234 also VC79 series etc.
Backlit LCD to display both setting and
measured value.
Adjustable Zero Energy Band, On/Off
Differential, Proportional Band and
Temperature Offset.
Analog output can be forced manually to be
convenient for installation & commissioning.
Optional 2 to 10Vdc or 4 to 20mA direct
acting and reverse acting analog output.
Selectable internal and external temperature
sensor.
Wide temperature control range (-20 to 110
° C by using external temperature sensor) is
suitable for extreme temperature control such
as steam and ice water.
Watch Dog Timer: to resume the controller
from hanging condition.
Brownout effect to avoid malfunctioning and
care on power ON and power OFF.
Pluggable terminal block allows pre-wiring
outside of the controller.
Compact size and slim design provide
elegant and attractive modern style
appearance.
APHITEMPCON001-11-04

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  Summary of Contents for Honeywell T2798I2000

  • Page 1: Table Of Contents

    FEATURES: PI (proportional plus integral) control action • provides accurate, stable and comfortable temperature control. Compatible with series 70 direct-coupled • damper / valve actuator like ML7161, ML7174, ML7420 / ML7421series ML7425, ML7984 series, N20010, S10010, M7410E series, CN7505, CN7510 / CN72 series CN7220 &...
  • Page 2: Specification

    PT1000. conditions are changed. Maximum 15m cable length (line resistance < 4.5Ω) MODEL: T2798I2000 Control Performance: This controller provides 4 to 20mA Enclosure: ABS Plastic, 2-piece. (IP30) or 2 to 10Vdc Proportional plus Integral modulating control and 4(2) A On/Off control.
  • Page 3: Dimensions, Installation & Wiring Terminals

    DIMENSIONS: WIRING TERMINAL: 1 & 2 – Relay Output 3 – 0Vac 4 – 24Vac 5 – Digital Input 6 – 2…10Vdc OR 4…20mA analog output 7 & 8 – PT1000 Remote Sensor 83.5 86.5 107.5 M3 Self Tapping screw INSTALLATION: The controller can be installed in any position on a flat surface using electrical box [Type-3 Module].
  • Page 4: Control Operation

    CONTROL OPERATION Input1 –Remote Temperature Sensor The controller has an integral sensing device mounted internally. It is also possible to install a remote room or duct return sensor at different locations. See wiring diagram. Note#1: The remote sensor should be PT1000 (Refer Accessories) Input2- Emergency Input Input2 is to connect with an On/Off dry contact for system error or emergency interlock control.
  • Page 5 Heat / Cool Changeover of Output1 Output1 is suitable for Heat/Cool changeover (manually) control in 2pipe AHU, Zoning control or Hydronic Heating application. Wiring connection is shown in fig. With cooling or heating selected, the user set point (SP) will be positioned at the middle of proportional band.
  • Page 6 Heating + Cooling Sequence control with Zero Energy Band This kind of control requires Zero Energy Band (Z-Band). Z-Band is pre-set. For control purpose, the zero energy band is centered on the user set point (SP), so its value defines the effective heating (H SP) &...
  • Page 7 Diagram 3: Cooling + Heating Sequence Control. H SP C SP Output 2 Output 1 Heating Cooling Valve Open 100% Diff Z-Band Valve Close Page 7 of 18 APHITEMPCON001-11-04...
  • Page 8 Heating/Cooling + Temperature Limitation Control Output2 can be used for temperature limitation control. To select this function, 2 temperature set points must be pre-set. One is in the mid of proportional band of output1 (C SP / H SP) as main setting temperature.
  • Page 9 Diagram 5: Heating + Temperature Limit Control. Output 2 Output 1 H SP A SP Alarm Heating Valve Open 100% Valve Close Temperature Increase Wiring Diagram I] STANDARD WIRING DIAGRAM: Pt1000 sensor 4 - 20 mA 2 - 10 VDC 24VAC 110VAC / 230VAC...
  • Page 10 II] T2798I2000 wiring with frequently used Actuators A] WIRING DIAGRAM T2798I2000 WITH ML-7984 Pt1000 sensor 4 - 20 mA 2 - 10 VDC NTC20K REMOTE SENSOR TRANSFORMER 50 / 60 Hz Ml7984 TRANSFORMER OVAC 24VAC 110VAC 0VAC 230V AC, 50Hz...
  • Page 11 C] WIRING DIAGRAM T2798I2000 WITH M7410E Pt1000 sensor 4 - 20 mA 2 - 10 VDC M7410E 100 - 0% 0 - 100% 0 - 10V 2 - 10V TRANSFORMER 50 / 60 Hz OVAC 24VAC 0 - 10V 0 - 100%...
  • Page 12: Installer Setup

    230VAC Installer Set-Up: 1. Power ON/OFF : Connect the main power. Display will show “Honeywell”, as shown in fig.1, for 5 Sec. Then display will show the Process value (PV) and Set point (SP) as shown in fig.2 Fig. 1 2.
  • Page 13 3. Zero Energy Band setting: Press “SELECT” to choose “Zero Energy Band Setting”, the display will show as in fig.3 Press key one time to switches from 1.5°C to 3.0°C. Press key one time to switches from 3.0°C to 1.5°C. Press “ENTER”...
  • Page 14 The range is 3.0 to –3.0 °C. Press “ENTER” key to save the setting value. ° ° Fig. 6 7. Mode Setting: Press “SELECT” to choose “MODE Setting”, the display will show as in fig.7 Press key one time to step up. The total number of modes is 6. It will stop incrementing at last mode i.e.
  • Page 15 9. Reverse Action Setting : Press “SELECT” to choose “Reverse Setting”, the display will show as in fig. 9 Press key one time to switches from OFF to ON. : Output1 in normal mode, i.e. 2 - 10Vdc or 4 - 20mA : Output in reversing mode, i.e.
  • Page 16 If manual ON, press key one time to step up the display value by 1%. If pressed continuously for more than ten steps then the value will increment by the step of 1.0% up to 100%. Release key to stop the increment of value. If manual ON, press key one time to step down the display value by 1%.
  • Page 17 Default Setting: S e t t i n g P a r a m e t e r s D e fa u l t V a l u e Z - B A N D 1 . 5 °C D IF F 0 .
  • Page 18 Environmental & Combustion Controls Honeywell Automation India Limited 56 & 57, Hadapsar Industrial Estate, Pune – 411 013, India. Phone: (91) 20 6603 9400 Fax: (91) 20 6603 9979 Subject to change without notice. Printed in India. Page 18 of 18...